摘要
Objective: Scientific publication in a journal by a member of the editorial committee of the same journal is known as authorial endogamy. To determine the presence of authorial endogamy in some Latin American dental journals. Material and Methods: Observational, descriptive, retrospective study. Eight dental journals from Brazil, Cuba and Chile indexed to Scopus in the period of 2018 - 2021 were analyzed. An evaluation was made of the manuscripts that include a member of the editorial committee as author. The results were expressed in percentages and frequency measurements and for the bivariate analysis, the Mann-Whitney U test and Fisher's exact test were used (p<0.05). Results: A total of 2026 articles, from which 14.52% (n=256), of authorial endogamy were found. The endogamy articles were mostly original articles 98.05% (n=252), experimental design 39.70% (n=102), advisory council 49.36% (n=153), co-authorship position 58.97% (n=184), with presence of 1 endogamic author per article 82.94% (n=214), the number of days from submission to acceptance were statistically lower in endogamic articles (p=0.003). Conclusion: The presence of editorial endogamy in some dental journals in Latin America was low, this finding is more frequent in original articles, mostly from the advisory board and as co-author. Additionally; it was found that endogamic articles took less days in editorial process. (AU)
Objetivo: A publicação científica em uma revista por um membro do comitê editorial da mesma revista é conhecido como endogamia autoral. Determinar a presença de endogamia autoral em algumas revistas odontológicas na América Latina. Material e Métodos: Estudo retrospectivo observacional e descritivo. Oito revistas odontológicas do Brasil, Cuba e Chile, indexadas na Scopus no período entre 2018 - 2021 foram analisadas. Foi realizada uma avaliação dos artigos que incluíam autores membros do comitê editorial. Os resultados foram expressos em porcentagem e medidas de frequência, e para a análise de bivariância foram utilizados o teste de Mann-Whitney U e teste exato de Fisher (p<0,05). Resultados: Foi um total de 2026 artigos, entre os quais 14,52% (n=256) foram detectados endogamia autoral. Os artigos endogâmicos foram, em sua maioria, artigos originais 98,05% (n=252), desenho experimental 39,70% (n=102), conselho consultivo 49,36% (n=153), em posição de co-autoria 58,97% (n=184), com a presença de 1 autor endogâmico por autor 82,94% (n=214), e o número de dias desde a submissão até o aceite foram estatisticamente menores em artigos endogâmicos (p=0,003). Conclusão: A presença de endogamia editorial em algumas revistas odontológicas na América Latina foi baixa, sendo este achado mais frequente em artigos originais, predominantemente em conselho consultivo e como co-autor. Adicionalmente, foi observado que artigos endogâmicos levaram menos dias no processo editorial (AU)
Subject(s)
Editorial Policies , Scientific Publication Ethics , Inbreeding , Latin America摘要
The objective of this research was to study the population structure of the Cattle Conservation Nucleos Curraleiro Pé Duro of the Instituto Nacional do Semiárido (NCP_INSA) based on pedigree data. Genealogical information from 338 animals registered in the period from 1991 to 2019 was used. The number of founding animals (Nf), the effective number of founders (fe), effective number of ancestors (fa), inbreeding coefficient (F), and average relatedness coefficient (AR), in addition to Fis, Fit and Fst were estimated. It was possible to identify ancestors up to the third generation, with an increase in information over the generations. Of the total pedigree information evaluated, 90.53% had the identification of the father and mother. The effective size of the population was smaller than those proposed by FAO, suggesting the need to redefine the herd management and genetic management plan strategies, promoting gene flow and breed expansion.(AU)
O objetivo com essa pesquisa foi estudar a estrutura populacional do Núcleo de Conservação de Bovinos Curraleiro Pé-Duro (NCP) do Instituto Nacional do Semiárido (INSA), por meio de dados de pedigree. Utilizaram-se informações genealógicas de 338 animais registrados no período de 1991 a 2019. Foi estimado o número de animais fundadores (Nf), o número efetivo de fundadores (fe), o número efetivo de ancestrais (fa), o coeficiente de endogamia (F) e o coeficiente de parentesco médio (AR), além do Fis, Fit e Fst. Foi possível identificar ancestrais até a terceira geração, com aumento crescente das informações ao longo das gerações. Do total de informações avaliadas, 90,53% possuíam identificação do pai e da mãe. O tamanho efetivo da população foi inferior ao mínimo proposto pela FAO, o que sugere a necessidade de redefinir as estratégias do plano de gestão e de manejo genético do rebanho, de modo a promover fluxo gênico e expansão da raça.(AU)
Subject(s)
Animals , Cattle , Pedigree , Genetic Background , Inbreeding/statistics & numerical data , Brazil摘要
Em consonância com os estudos em Demografia Histórica e História da Família, este artigo visa a resgatar aspectos relativos à nupcialidade vivenciada pelos italianos e seus descendentes no município de Franca, interior do estado de São Paulo. A reflexão é corroborada pela historiografia recente que aponta a expansão da economia cafeeira no interior paulista como responsável por alterações no panorama demográfico por meio da atração de uma imigração internacional em massa, cujos impactos foram sentidos em diferentes espaços de ação, na família, nas relações matrimoniais, na etnicidade e integração desses grupos na sociedade brasileira entre o final do século XIX e as primeiras décadas do século XX. Combinando metodologias seriais e de microanálise para explorar os dados disponíveis nos registros de matrícula da Hospedaria de Imigrantes de São Paulo e assentos de casamento do Registro Paroquial do Arquivo da Cúria Diocesana de Franca (1885-1930), abre-se caminho para enriquecer o universo de interpretações sobre a nupcialidade nos municípios atingidos pela imigração internacional de italianos. Esse artigo examina os impactos das variáveis imigratórias nos padrões de casamento dos italianos no município e resgata aspectos da endogamia desse grupo, favorecida pelos respectivos contextos e bagagens culturais que conduziram o processo imigratório por eles vivenciado.
In line with studies in Demographic History and Family History, this article aims to rescue aspects related to nuptiality experienced by Italians and their descendants in the municipality of Franca, in the interior of the state of São Paulo. The reflection is corroborated by recent historiography research pointing to the expansion of the coffee-based economy in the interior of São Paulo as responsible for demographic changes through the attraction of mass international immigration. This affected different areas, including family, matrimonial relations, ethnicity and integration of these groups in Brazilian society at the turn of the 20th century. A combination of serial and microanalysis methodologies to explore the data available in the registration records of the São Paulo Immigrant Inn and wedding seats in the Parish Records of the Diocesan Archive of Franca (1885-1930), paves the way to expand the universe of interpretations on nuptiality in municipalities affected by Italian immigration. This article examines the impacts of immigration variables on Italians' marriage patterns in the municipality and retrieves aspects of this groups' inbreeding, favored by the respective cultural contexts and backgrounds that led to the immigration process they experienced.
En línea con los estudios en Demografía histórica e Historia familiar, este artículo tiene como objetivo rescatar aspectos relacionados con la nupcialidad vivida por los italianos y sus descendientes en el municipio de Franca, en el interior del estado de San Pablo. La reflexión es corroborada por la historiografía reciente, que apunta a la expansión de la economía cafetera en el interior del estado como responsable de cambios en el panorama demográfico mediante la atracción de la inmigración internacional masiva, cuyos impactos se sintieron en diferentes espacios de acción, en la familia, en las relaciones matrimoniales, en la etnicidad y en la integración de estos grupos en la sociedad brasileña entre fines del siglo XIX y las primeras décadas del XX. Al combinar metodologías seriadas y de microanálisis para explorar los datos disponibles en los registros de la Posada de Inmigrantes de San Pablo y en los asientos de boda del Registro Parroquial del Archivo de la Curia Diocesana de Franca (1885-1930) se abre el camino para enriquecer el universo de interpretaciones sobre nupcialidad en los municipios afectados por la inmigración internacional de italianos. Este artículo examina los impactos de las variables de inmigración en los patrones matrimoniales de los italianos en el municipio y recupera aspectos de la endogamia de este grupo, favorecida por los respectivos contextos culturales y antecedentes que llevaron al proceso de inmigración que vivieron.
Subject(s)
Humans , Marriage , Demography , Emigrants and Immigrants , Brazil/ethnology , Ethnicity , Family/history , Records , Inbreeding , Italy/ethnology摘要
El papel de la endogamia como causa de homocigosidad en la salud humana es un foco de interés en genética médica, debido a su relación con anomalías congénitas y patologías genéticas recesivas. Es un tema importante a pesar de que las tasas de uniones consanguíneas en ciertas sociedades han disminuido con el tiempo; sin embargo, en algunas comunidades se han mantenido estables o han aumentado. La consanguinidad es practicada hasta en el 10% de la población mundial, y los motivos más comúnmente citados son socioculturales y socioeconómicos. Aunque se ha visto una disminución de esta práctica, probablemente por la migración urbana y el aumento de las tasas de educación, la consanguinidad continúa practicándose en todo el mundo. Los efectos más significativos sobre los resultados reproductivos se deben, principalmente, a condiciones hereditarias autosómicas recesivas, que también aumentan la frecuencia de algunos desórdenes médicos. El objetivo de esta revisión es dar a conocer la epidemiología y los factores predisponentes de la consanguinidad, así como presentar la evidencia actual de la asociación entre la consanguinidad originada en la endogamia y las anormalidades congénitas y patologías médicas como consecuencia de trastornos genéticos mendelianos. Se requiere un enfoque culturalmente apropiado para el asesoramiento genético en relación con la endogamia
The role of consanguinity as a cause of homozygosity in human health is a focus of interest in medical genetics, due to its relationship with congenital anomalies and recessive genetic pathologies. This is an important issue since the rates of consanguineous unions in certain societies have decreased over time, but have remained stable or have increased in others. Consanguinity is practiced in up to 10% of the world population, and the most common reasons are sociocultural and socioeconomic factors. Although there has been a decrease in this practice, probably due to urban migration and an increase in education rates, consanguinity continues to be practiced throughout the world. The most significant effects on reproductive outcomes are mainly due to autosomal recessive hereditary conditions, that also increase the frequency of medical disorders. The aim of this review is to present the current evidence of the association between consanguinity originating from endogamy, with congenital abnormalities and medical disorders originated from mendelian genetic pathologies. A cultural appropriate approach is required for genetic counseling in relation to consanguineous endogamy
Subject(s)
Humans , Consanguinity , Congenital Abnormalities , Founder Effect , Inbreeding摘要
INTRODUCCIÓN. Los encuentros académicos públicos de expertos en divulgación cien-tífica que a través de órganos de registro y difusión oficial de revistas promueven el progreso de la ciencia, son un canal de comunicación entre la comunidad científica, tra-ducen el conocimiento de las disciplinas, educan y actualizan al profesional en sus roles de autor, lector, revisor, editor. Se fundamentan en políticas públicas y conducta ética. OBJETIVO. Describir las memorias del encuentro de editores, noviembre 2019, como insumo para las autoridades competentes que contribuya a establecer políticas y estrate-gias que permitan elevar la calidad científica, así como el proceso editorial de las revistas científicas en salud del Ecuador. MATERIALES Y MÉTODOS. Estudio observacional, descriptivo, con población y muestra conocida, obtención de la información en el sistema de gestión documental del Hospital de Especialidades Carlos Andrade Marín, noviembre 2019. RESULTADOS. Estadística descriptiva del perfil de los asistentes, descripción de problemas, soluciones y aportes. CONCLUSIÓN. Obtención de insumos del encuentro de editores en las "Buenas Prácticas del Proceso Editorial". Organización, estructura, norma, rol del equipo editorial, revisión de pares y Plan Anual de Capacitación Continua.
INTRODUCTION. Public academic meetings of experts in scientific dissemination that through the registration and official dissemination bodies of journals promote the progress of science, are a channel of communication between the scientific community, transla-te knowledge of the disciplines, educate and update the professional in their roles as author, reader, reviewer, editor. They are based on public policies and ethical conduct. OBJECTIVE. Describe the memories of the meeting of editors, November 2019, as an input for the competent authorities that contributes to establishing policies and strategies that allow raising scientific quality, as well as the editorial process of scientific journals in health in Ecuador. MATERIALS AND METHODS. Descriptive study, with a population and a known sample, obtaining the information in the document management system of the Carlos Andrade Marin Specialties Hospital, November 2019. RESULTS. Descriptive statistics of the assistants profile, description of problems, solutions and contributions. CONCLUSION. Obtaining inputs from the meeting of editors in the "Good Practices of the Editorial Process". Organization, structure, norm, role of the editorial team, peer review and Annual Continuous Training Plan.
Subject(s)
Humans , Male , Female , Peer Review, Research , Periodical , Scientific Publication Ethics , Publication Formats , Open Access Publishing , Inbreeding , Total Quality Management , Hospitals摘要
Este estudo analisou a estrutura populacional de ovinos deslanados do núcleo de conservação do estado do Ceará, Brasil. Os parâmetros populacionais foram estimados com base nos dados genealógicos de indivíduos das raças Santa Inês (SI), Somalis (SO) e Morada Nova (MN), nascidos entre os anos de 2001 e 2014. Os parâmetros estimados foram: número de gerações completas equivalentes (GCE), intervalo entre gerações (IEG), número de fundadores (Nf), número efetivo de fundadores (fe), número efetivo de ancestrais (fa), coeficiente de endogamia (F) e índice de contribuição genética (ICG). O GCE médio foi de 1,82, 2,78 e 1,52 para SI, SO e MN, respectivamente. O IEG foi próximo entre as raças, 3,67 anos em média. O Nf para SI, SO e MN foi igual a 225, 194 e 153, respectivamente. As razões fe/fa foram distantes de 1 nas três populações, o que indica ocorrência de gargalo genético, principalmente para SO. Os coeficientes médios de endogamia foram de 1,81%, 0,78% e 0,78% para SI, SO e MN, respectivamente. O ICG foi de 3,32, 5,38 e 2,87 para SI, SO e MN, respectivamente. Os parâmetros populacionais estimados apontam que parte da genética original desses rebanhos foi perdida, principalmente na população da raça Somalis.(AU)
This study evaluated the population structure of sheep without wool from the conservation nucleus in Ceará State, Brazil. Population parameters were estimated on genealogical records of Santa Ines (SI), Somali (SO,) and Morada Nova (MN) breeds, that were born between 2001 and 2014. The following estimates were obtained: number of complete generation equivalents (GCE), generation intervals (IEG), number of founders (Nf), effective number of founders (fe), effective number of ancestors (fa), inbreeding coefficient (F), and genetic contribution index (ICG). Average GCE was 1.82, 2.78, and 1.52 for SI, SO, and MN respectively. Mean IEG was similar between breeds, 3.67 years. The Nf was 225, 194, and 153 for SI, SO, and MN respectively. The fe/fa ratios were different to 1, which is an indication of genetic bottleneck, mainly for SO. The average inbreeding coefficients were 1.81%, 0.78%, and 0.78% for SI, SO, and MN respectively. The ICG was 3.32, 5.38, and 2.87 for SI, SO, and MN respectively. Estimated population parameters indicate that part of the genetics of these breeds was lost, mainly in Somalis.(AU)
Subject(s)
Animals , Population , Wool , Sheep , Inbreeding/statistics & numerical data摘要
O objetivo do presente trabalho foi avaliar a variabilidade genética de larvas e alevinos de piracanjuba em programa de repovoamento. Foram coletadas 180 larvas de piracanjuba de três dias e 90 alevinos de três meses de idade. Foram avaliados cinco loci microssatélites, os quais produziram 19 alelos. Não houve presença de alelos raros nem perdas de alelos ao longo do período. A heterozigosidade observada foi superior nas larvas em relação aos alevinos. Houve desvio no equilíbrio de Hardy-Weinberg na maioria dos loci em ambos os grupos. O coeficiente de endogamia foi positivo em ambos os grupos, sendo a média dos alevinos superior em relação às larvas. O excesso de heterozigotos foi significativo no modelo Stepwise Mutation Model para os alevinos, indicando a possibilidade de efeito gargalo recente. Conclui-se que, apesar da adequada variabilidade genética encontrada, os valores do coeficiente de endogamia e a possibilidade de efeito gargalo nos alevinos atentam para a necessidade de constante monitoramento genético desses estoques antes da liberação no ambiente.(AU)
The objective of this study was to evaluate the genetic variability of Piracanjuba larvae and fingerlings in restocking program. A total of 180 three-day Piracanjuba larvae and 90 three-month-old fish were sampled. Five microsatellite loci were evaluated, which produced 19 alleles. There were no rare alleles or loss of alleles over the period. The observed heterozygosity was higher in larvae compared to fingerlings. There was a deviation in Hardy-Weinberg equilibrium in most loci in both groups. The inbreeding coefficient was positive in both groups, with the average of the fingerlings superior to the larvae. The excess heterozygotes were significant in the Stepwise Mutation Model for the fingerlings, indicating the possibility of a recent bottleneck effect. Despite the adequate genetic variability found, the values of the inbreeding coefficient and the possibility of bottleneck effect in the fingerlings show the need for constant genetic monitoring of these stocks prior to release into the environment.(AU)
Subject(s)
Animals , Fishes , Biological Variation, Population , Inbreeding摘要
Allelic differences in A and B mating-type loci are a prerequisite for the progression of mating in the genus Pleurotus eryngii; thus, the crossing is hampered by this biological barrier in inbreeding. Molecular markers linked to mating types of P. eryngii KNR2312 were investigated with randomly amplified polymorphic DNA to enhance crossing efficiency. An A4-linked sequence was identified and used to find the adjacent genomic region with the entire motif of the A locus from a contig sequenced by PacBio. The sequence-characterized amplified region marker 7-2299 distinguished A4 mating-type monokaryons from KNR2312 and other strains. A BLAST search of flanked sequences revealed that the A4 locus had a general feature consisting of the putative HD1 and HD2 genes. Both putative HD transcription factors contain a homeodomain sequence and a nuclear localization sequence; however, valid dimerization motifs were found only in the HD1 protein. The ACAAT motif, which was reported to have relevance to sex determination, was found in the intergenic region. The SCAR marker could be applicable in the classification of mating types in the P. eryngii breeding program, and the A4 locus could be the basis for a multi-allele detection marker.
Subject(s)
Breeding , Cicatrix , Classification , Dimerization , DNA , DNA, Intergenic , Inbreeding , Pleurotus , Transcription FactorsSubject(s)
Behavior , Consanguinity , Indigenous Culture , Genetic Diseases, Inborn , Honduras , Inbreeding摘要
Background: Marker-assisted introgression currently represents the most widely spread application of DNA markers as an aid to selection in plant breeding. New barley germplasm should be supplemented by genes that facilitate growth and development under stressful conditions. The homology search against known genes is a fundamental approach to identify genes among the generated sequences. This procedure can be utilized for SNP search in genes of predicted function of interest and associated gene ontology (GO). Results: Backcross breeding enhanced by marker selection may become a powerful method to transfer one or a few genes controlling a specific trait. In the study, the integrated approach of combining phenotypic selection with marker assisted backcross breeding for introgression of LTP2 gene, in the background of semi-dwarf spring barley cultivar, was employed. This study discusses the efficiency of molecular marker application in backcrossing targeted on the selected gene. Conclusions: BC6 lines developed in this study can serve as a unique and adequate plant material to dissect the role of LTP2 gene. Due to its role in lipid transfer, the LTP2 may be crucial in lipidome modification in response to abiotic stress.
Subject(s)
Selection, Genetic , Hordeum/genetics , Crosses, Genetic , Plant Breeding/methods , Genetic Markers , Polymorphism, Single Nucleotide , Inbreeding摘要
Esse artigo tem por objetivo analisar os padrões de seletividade marital entre os casais heterossexuais e os casais homossexuais no Brasil, investigando os níveis de escolaridade, cor/raça e grupo etário. Inicialmente foi feita uma análise descritiva dos dados com o intuito de caracterizar a população estudada e os diferenciais entre os tipos de casais. Além disso, esse artigo utiliza tabelas de contingência e modelos log-lineares para compreender as formas de associações entre os casais e quais variáveis influenciam a seletividade dos parceiros. Os resultados mostram que cor/raça e escolaridade têm maior influência na seletividade dos casais heterossexuais, enquanto cor/raça e grupo etário são mais relevantes para os casais homossexuais em relação aos seus padrões de seletividade. Portanto, é possível identificar a existência de diferenças entre as características de seletividade entre esses casais e seus padrões, o que abre margem para estudos posteriores que possam aprofundar a compreensão das distinções entre esses padrões, no sentido de encontrar formas de tentar explicá-las e suas possíveis consequências no Brasil.
El objetivo de este artículo es analizar los patrones de selectividad marital entre las parejas heterosexuales y homosexuales en Brasil, investigando para ello los niveles de escolaridad, color/raza y grupo etario. Inicialmente se realizó un análisis descriptivo de los datos con el fin de caracterizar a la población estudiada y los diferenciales entre los tipos de parejas. Además, el estudio utiliza tablas de contingencia y modelos log-lineares para entender las formas de asociación entre las parejas y las variables que influyen en la selectividad de sus miembros. En relación con los patrones de selectividad, los resultados muestran que el color/raza y la escolaridad tienen mayor influencia en las parejas heterosexuales, mientras que el color/raza y el grupo etario al que se pertenece son más relevantes para las parejas homosexuales. Por lo tanto, se pueden identificar diferencias entre las características de la selectividad de estas parejas y sus patrones, lo que abre un espacio para estudios posteriores que puedan profundizar la comprensión de las diferencias entre estos patrones, con el fin de intentar explicar estas distinciones y sus posibles consecuencias en el país.
Subject(s)
Humans , Male , Female , Young Adult , Middle Aged , Censuses , Choice Behavior , Family Characteristics , Heterosexuality , Homosexuality , Sexual Partners/psychology , Age Factors , Brazil , Educational Status , Inbreeding/statistics & numerical data , Linear Models , Socioeconomic Factors摘要
The umbu tree (Spondias tuberosa) is one of the most important endemic species to the Brazilian tropical semiarid region. The umbu tree has edible fruits with a peculiar flavor that are consumed in natura or in a semi-industrialized form, such as jams, candies and juices. The majority of endemic species to Brazilian semiarid region have not been studied or sampled to form germ- plasm collections, which increases the risk of losing genetic variability of the adapted species to xerophytic conditions. The aim of this study was to estimate outcrossing rates in S. tuberosa using a multilocus mixed model in order to guide genetic resources and breeding programs of this species. DNA samples were extracted from 92 progenies of umbu trees, which were distributed among 12 families. These trees were planted by seed in 1991 in Petrolina, PE, Brazil. The experimental design was a randomized block, with a total of 42 progenies sampled in three regions. The experimental units were composed by five plants and five replications. The out- crossing rate was estimated by the multilocus model, which is available in the MLTR software, and was based on 17 polymorphic AFLP bands obtained from AAA_CTG and AAA_CTC primer combinations. The observed heterozygotes ranged from 0.147 to 0.499, with a maximum frequency estimated for the AAA_CTC_10 ampli- con. The multilocus outcrossing estimation ( ) was 0.804±0.072, while the single-locus ( ) was 0.841±0.079, which suggests that S. tuberosa is predominantly an outcrossing species. The difference between and was -0.037±0.029, which indicates that biparental inbreeding was nearly absent. The mean inbreeding coefficient or fixation index ( ) among maternal plants was - 0.103±0.045, and the expected was 0.108, which indicates that there was no excess of heterozygotes in the maternal population. The outcrossing estimates obtained in the present study indicate that S. tuberosa is an open-pollinated species. Biometrical models applied to this species should therefore take into account the deviation from random outcrossing to estimate genetic parameters and the constitution of broad germplasm samples to preserve the genetic variability of the species. Outcrossing rates based on AFLP and the mixed-mating model should be applied to other studies of plant species in the Brazilian semiarid region.
El árbol de umbu (Spondias tuberosa) es una de las especies endémicas más importantes de la región semiárida del Brazil. El mismo tiene frutos comestibles con sabor distinto y puede ser consumido fresco o semiindustrializado, como mermeladas y zumos. La mayoría de las especies endémicas de la región semiárida del Brazil no fueron estudiadas o muestreadas para formar colecciones de germoplasma, aumentando el riesgo de pérdida de la variabilidad genética. El objetivo de este trabajo fue estimar las tasas de polinización cruzada en S. tuberosa basada en el modelo multi-locus mixto, con el fin de orientar los recursos genéticos y los programas de mejoramiento de esta especie. Muestras de ADN fueron extraídas de 92 progenies de árboles umbuzeiro, distribuidos en 12 familias, que se establecieron en Petrolina, PE, Brazil, 09º09’ S - 40º22’ W. El diseño experimental fue de bloques al azar con un total de 42 progenies muestreadas en tres regiones. La tasa de fecundación cruzada fue estimada por el modelo multi-locus disponible en el software MLTR, basado en 17 bandas de AFLP polimórficas obtenidas a partir de las combinaciones de cebadores AAA_CTG y AAA_CTC. Los heterocigotos observados oscilaron entre 0.147 y 0.499 con la frecuencia máxima estimada para AAA_CTC 10 amplicón. El valor estimado de cruzamiento multi-locus ( ) fue 0.804±0.072, mientras que el locus de uno-locus ( ) fue 0.841±0.079, lo que sugiere que S. tuberosa es predominantemente una especie de polinización cruzada. La diferencia entre el y fue de -0.037± 0,029, lo que indica que la endogamia bi-parental fue casi inexistente. La media del coeficiente de fijación ( ) entre las plantas maternas fue - 0.103±0.045, mientras que la esperada fue 0.108, lo que indica que no hubo un exceso de heterocigotos en la población materna. Las estimaciones obtenidas en este trabajo indican que S. tuberosa es una especie de polinización cruzada. Los modelos biométricos aplicados a esta especie deben tener en cuenta la desviación del cruce aleatorio para estimar los parámetros genéticos y la formación de grandes muestras para preservar la variabilidad genética de esta especie. La tasa de fecundación cruzada basada en AFLP y el apareamiento mezclado debe ser aplicado a otros estudios de especies de plantas de la región semiárida del Brazil.
Subject(s)
Anacardiaceae/physiology , Crosses, Genetic , Inbreeding , Amplified Fragment Length Polymorphism Analysis , Anacardiaceae/classification , Anacardiaceae/genetics , Brazil摘要
Foram utilizados dados de pedigree de 2.558 bovinos da raça Gir Mocha nascidos no período de 1954 a 2005. As análises foram realizadas utilizando-se o programa Endog. Do total de animais estudados, 61,9%; 10,6% e 0,1% possuíam pedigree na primeira, segunda e terceira gerações, respectivamente.O número efetivo de rebanhos que forneceram machos reprodutores foi de 10,25 para pais e 3,87 para avôs, confirmando a baixa integralidade do pedigree. O número de animais fundadores foi de 975,5, e o número efetivo de fundadores de 141,34. O número de ancestrais na população referência foi de 924 animas, dos quais apenas 39 explicaram 50% da variabilidade genética da população.O coeficiente médio de relação foi estimado em 0,75%, sendo o maior coeficiente individual de 25%. O coeficiente de endogamia foi igual a zero de 1954 a 1984. Vale salientar que, neste período, estão incluídos os animais sem ascendência conhecida. A endogamia e o coeficiente médio de relação da população foram baixos, contudo podem estar subestimados em razão da pequena integralidade do pedigree.
In this study we used data from the 2558 pedigree cattle polled Gir born from 1954 to 2005. Analyses were performed using the Endog program. Of all animals studied, 61.86%, 10.56% and 0.10% had a pedigree in the first, second and third generation, respectively. The effective number of herds that provide breeding males was 10.25 for parents and 3.87 for grandparents, corroborating the low completeness of the pedigree. The number of founder animals was 975.5 and the effective number of founders were 141.34. The number of ancestors in the reference population was 924 animals from which only 39 accounted for 50% of the genetic variability of the population. The average relationship coefficient was estimated at 0.75%, the largest individual coefficient was 25%. The inbreeding coefficient was zero from 1954 to 1894. It is noteworthy that during this period included the population was low, but may be underestimated because of the small pedigree integrity.
Subject(s)
Animals , Cattle , Inbreeding , Pedigree , Physical Chromosome Mapping/veterinary摘要
Genetic variability in captive populations of Crocodylus moreletii (Crocodylia: Crocodylidae) using microsatellites markers. Crocodylus moreletii, an extinction threatened species, represents an emblem for tropical ecosystems in Mexico. Surprisingly, there is a lack of information about their genetic constitution, which should be evaluated for a proper management ex situ and for making decisions on the release of crocodiles into natural habitats. The aim of this study was to characterize and compare the genetic variability of four populations of C. moreletii (two wild versus two born ex situ). Through PCR were amplified seven microsatellite polymorphic loci, however a heterozygote deficit, diminished by the presence of null alleles, was found in the populations (average H O=0.02). The AMOVA indicated that the highest proportion of genetic variability is within populations, and a limited genetic differentiation among populations (average F ST=0.03), probably due to high inbreeding index (average F IS=0.97). When comparing the genetic variability between and within other crocodilian species, we found that in C. moreletii is well below those reported. We concluded that the limited genetic variability in ex situ born populations is probably due to a founder effect derived from the social structure of their progenitors, and by the bottleneck effect, inferred by the limited effective population size, that historically characterizes their natural distribution in wild populations.
Crocodylus moreletii representa un emblema para los ecosistemas tropicales de México pero actualmente está amenazada por extinción. Sorprendentemente, hay una falta de información de su constitución genética, que debe ser evaluada para un manejo apropiado ex situ y para toma de decisiones en la liberación de cocodrilos a su hábitat natural. El objetivo del estudio fue caracterizar y comparar la variabilidad genética de cuatro grupos poblacionales de C. moreletii (dos silvestres y dos nacidas ex situ). Mediante PCR se amplificaron siete loci de microsatélites polimórficos, sin embargo se encontró déficit de heterocigotos en las poblaciones (promedio H O=0.02) mermado por la presencia de alelos nulos. El AMOVA indicó que la mayor proporción de variabilidad genética se encuentra dentro de las poblaciones y una limitada diferenciación genética entre poblaciones (promedio F ST =0.03), probablemente debida al alto índice de endogamia (promedio F IS=0.97). Al comparar la variabilidad genética inter e intra especies de cocodrilianos, encontramos que en C. moreletii está muy por debajo de los reportados. Se concluye que la limitada variabilidad genética de las poblaciones nacidas ex situ probablemente se debe al efecto fundador derivado de la estructura social de sus progenitores, y de las poblaciones silvestres, por el efecto cuello de botella, inferido por el limitado tamaño efectivo de población que presentó históricamente en su distribución natural.
Subject(s)
Animals , Female , Male , Alligators and Crocodiles/genetics , Genetics, Population , Genetic Variation/genetics , Microsatellite Repeats/genetics , Alleles , Alligators and Crocodiles/classification , Gene Frequency , Inbreeding , Mexico , Polymerase Chain Reaction摘要
This paper is a brief account of the scientific work of J.B.S. Haldane (1892–1964), with special reference to early research in Human Genetics. Brief descriptions of Haldane's background, his important contributions to the foundations of human genetics, his move to India from Great Britain and the research carried out in Human Genetics in India under his direction are outlined. Population genetic research on Y-linkage in man, inbreeding, color blindness and other aspects are described.
Subject(s)
Color Vision Defects/genetics , Genetics/history , Human Genetics/history , History, 20th Century , Humans , Inbreeding/genetics , India , Mutism/genetics摘要
To describe the relationships between depression and gender, socio-economic status, education, urban or rural living and coefficient of inbreeding in a well defined relatively homogeneous population. Descriptive study. King Edward Medical College, Lahore from January 1999 to January 2002. Subjects were interviewed and diagnosed by a trained psychiatrist and information was collected on various variables. Inbreeding coefficients were calculated from genealogical data. Of 211 persons interviewed, 182 had a lifetime diagnosis of recurrent major depression and 26 had no psychiatric diagnosis. Multiple regression analysis revealed greater severity and earlier age at onset in women than men but no significant correlation of severity or age at onset with socioeconomic status, urban versus rural living or coefficient of inbreeding. This appears to be a genetically homogenous sub-type of depression and further genetic studies may reveal underlying genetic risk factors
Subject(s)
Humans , Male , Female , Depressive Disorder , Depression , Rural Population , Rural Health , Inbreeding , Consanguinity , Family摘要
Milk yield records (305d, 2X, actual milk yield) of 123,639 registered first lactation Holstein cows were used to compare linear regression (y = β0 + β1X + e) ,quadratic regression, (y = β0 + β1X + β2X2 + e) cubic regression (y = β0 + β1X + β2X2 + β3X3 + e) and fixed factor models, with cubic-spline interpolation models, for estimating the effects of inbreeding on milk yield. Ten animal models, all with herd-year-season of calving as fixed effect, were compared using the Akaike corrected-Information Criterion (AICc). The cubic-spline interpolation model with seven knots had the lowest AICc, whereas for all those labeled as "traditional", AICc was higher than the best model. Results from fitting inbreeding using a cubic-spline with seven knots were compared to results from fitting inbreeding as a linear covariate or as a fixed factor with seven levels. Estimates of inbreeding effects were not significantly different between the cubic-spline model and the fixed factor model, but were significantly different from the linear regression model. Milk yield decreased significantly at inbreeding levels greater than 9 percent. Variance component estimates were similar for the three models. Ranking of the top 100 sires with daughter records remained unaffected by the model used.
Subject(s)
Animals , Cattle/genetics , Dairying , Lactation , Food Production , Inbreeding摘要
Molecular markers may accelerate selection through the identification of plants with higher proportion of recurrent parent genome, as well as identifying those plants bearing target alleles like quantitative traits loci (QTLs) for white mold resistance. The objectives of this work were: 1) to employ microsatellite markers (SSR) in order to accelerate the recovery of recurrent parent genome 2) to validate sequence characterized amplified region (SCAR) Phs associated with a QTL that confers resistance to white mold, as previously identified in bean populations. Lines G122 and M20 were crossed, which generated 267 F1 plants from backcross (BC) BC1 and 113 plants from backcross BC2.SSR polymorphic markers were adopted. The relationship between BC plants and the recurrent parent was estimated based on the recurrent genome proportion (PR) in each BC plant, and the Sorensen-Dice genetic similarity (sg ir). To determine how much the phenotypic variation is explained by SCAR Phs, 56 F1:2BC1 progenies were evaluated on the field following a random block design with two replications through the straw test method. SSR markers are efficient in identifying individuals with a greater proportion of the recurrent genome. SCAR Phs was not efficient for the indirect selection of common beans for white mold resistance.
Subject(s)
Fungi , Fabaceae/genetics , Fabaceae/immunology , Ascomycota , Crosses, Genetic , Plant Diseases/immunology , Inbreeding , Microsatellite Repeats , Biomarkers , Phaseolus/genetics , Phaseolus/immunology , Selection, Genetic摘要
Estudou-se o efeito da endogamia sobre as características sobrevivência (intervalos de 0-30; 30-60; 60-90 e 90-120 dias) e longevidade do escargot da espécie Helix aspersa em três gerações consecutivas de acasalamentos entre irmãos perfeitos. Os animais foram criados em laboratório com temperatura entre 20 e 25ºC e umidade relativa entre 70 a 90 por cento. O menor percentual de sobrevivência ocorreu no primeiro intervalo, mas, com o aumento da endogamia, observou-se diminuição na sobrevivência nos quatro intervalos testados. A longevidade média foi de 314 e 306 dias para as gerações um e três, respectivamente, não tendo sido observados animais em hibernação. O estudo de simulação para o caráter sobrevivência, em função do coeficiente de endogamia, indicou que se deve iniciar uma criação com, pelo menos, 100 reprodutores não aparentados.
The effect of inbreeding on longevity and viability (intervals of 0-30, 30-60, 60-90, and 90-120 days of birth) in three consecutive generations of full sibs of escargot Helix aspersa raised under laboratory conditions (20-25ºC temperature; 70-90 percent relative humidity) was studied. Inbreeding effects decreased the viability for all the studied intervals. The longevity means were 314 and 306 days, respectively to the first and third generations. Hibernating animals were not observed. Population size of at least 100 non-related mating escargots replaced after 10 generations to avoid inbreeding effect is recommended.
Subject(s)
Animals , Helix, Snails , Longevity , Survival Rate , Inbreeding摘要
Habroconus semenlini is a micro-terrestrial gastropod native to South America. There are no previous studies on its biology. We studied its pattern of growth, fertility and lifespan under laboratory conditions. For this purpose, 80 snails were either grouped or kept isolated (40 animals in each condition) during their lifetime. Growth is indeterminate and the species is capable of self-fertilization with high reproductive success. Grouped snails had lower fecundity than the animals that were kept in isolation. This species has a short lifespan and only one reproductive period, which characterizes the occurrence of semelparity. Rev. Biol. Trop. 57 (4): 1217-1222. Epub 2009 December 01.
Habroconus semenlini es un gastrópodo micro-terrestre nativo de América del Sur. Actualmente se carece de estudios sobre su biología. Este estudio tuvo como objetivo verificar el patrón de crecimiento, la fecundidad y la esperanza de vida de esta especie en condiciones de laboratorio. Con este fin, 80 caracoles fueron mantenidos aislados o agrupados (40 animales en cada condición) durante su ciclo de vida. La especie tiene crecimiento indeterminado y es capaz de auto-fertilización con alto grado de éxito reproductivo. Los caracoles agrupados tuvieron menor fecundidad que los que se mantuvieron en aislamiento. Esta especie tiene una vida útil corta, y sólo un período reproductivo, lo que caracteriza la semelparidad.