RESUMO
The insulin-like growth factor I (IGF-1) gene plays important roles in the growth and body composition of animals. Serum IGF1 concentration has been associated with growth traits in many livestock species. We found a polymorphism of cattle IGF1-TasI locus and analyzed the distribution of alleles in three cattle breeds, including Qinchuan, Nanyang, and Chinese Holstein. PCR-RFLP analysis showed that allele A was the dominant allele. The frequencies of allele A varied from 0.84 to 0.97. Distributions of genotypic and allelic frequencies were significantly different among breeds. Polymorphism of the IGF1 gene was significantly affecting hucklebone width at 6 months in the Nanyang breed and protein and fat yield of the third lactation in Chinese Holstein cattle. Individuals with allele C had a significantly higher performance in production traits.
Assuntos
Regiões 5' não Traduzidas/genética , Bovinos/genética , Fator de Crescimento Insulin-Like I/genética , Polimorfismo de Nucleotídeo Único , Alelos , Animais , Animais Recém-Nascidos , Composição Corporal/genética , Pesos e Medidas Corporais , Bovinos/classificação , Bovinos/crescimento & desenvolvimento , China , Feminino , Frequência do Gene , Estudos de Associação Genética/métodos , Genótipo , Masculino , Reação em Cadeia da Polimerase , Polimorfismo de Fragmento de Restrição , Especificidade da Espécie , Fatores de TempoRESUMO
Growth hormone-releasing hormone receptor (GHRHR) has important functions in the regulation of the growth hormone axis and the development and proliferation of pituitary somatotropes. Moreover, some mutations in mouse GHRHR can induce the dwarfism. The objective of this paper is to reveal the association of GHRHR with growth traits in three Chinese cattle breeds, including Nanyang cattle (NY, 220), Qinchuan cattle (QC, 114), and Jiaxian cattle (JX, 142). A novel single nucleotide polymorphism (NM_181020:c.102C>T) in 5'UTR of GHRHR was identified using PCR-SSCP and DNA sequencing. The frequency of NM_181020:c.102C allele ranged from 0.926 to 0.956. We found that the locus was significantly associated with NY cattle's body weight (BW) of 6 months, with average daily gain (ADG) of 0-6 months, and as well as with ADG of 6-12 months (p < 0.05). The data suggested that the polymorphism (NM_181020:c.102C>T) of the GHRHR could be a molecular marker candidate for breeding of NY cattle in favor of BW.
Assuntos
Regiões 5' não Traduzidas/genética , Bovinos/crescimento & desenvolvimento , Bovinos/genética , Estudos de Associação Genética , Polimorfismo de Nucleotídeo Único/genética , Receptores de Neuropeptídeos/genética , Receptores de Hormônios Reguladores de Hormônio Hipofisário/genética , Aumento de Peso/genética , Animais , Sequência de Bases , Cruzamento , China , Frequência do Gene/genética , Loci Gênicos/genética , Heterozigoto , Homozigoto , Análise dos Mínimos Quadrados , Camundongos , Dados de Sequência Molecular , Característica Quantitativa HerdávelRESUMO
DLK1 and CLPG were located in DLK1-GTL2 imprinted cluster. They all affected muscle growth and meat tenderness. The functional importance of DLK1 and CLPG imply that the variation of the genes could affect the growth traits of animal. PCR-SSCP and sequencing were used to analyze the four loci of DLK1 gene and CLPG gene in 1109 individuals, which belong to eight breeds/species of bovidae, including cattle, buffalo and yak. A synonymous mutation (C451T) was detected in exon 5 of DLK1 in Qinchuan cattle, but didn't change significantly with phenotypic traits. Three genotypes AA, AB and AC of CLPG were identified in Jiaxian cattle. The associations analyst of different genotypes showed that the individuals with genotypes AA and AC had a greater body weight and longer body length than those with genotype AB (P<0.05 and P<0.01, respectively); the AA individuals were different from those AB (P<0.05) in the circumference of cannon bone. No polymorphism was observed in the other populations at other loci. These results were in agreement with the homology analysis: DLK1 and CLPG genes were in a highly conserved.
Assuntos
Bovinos/genética , Estudos de Associação Genética , Peptídeos e Proteínas de Sinalização Intercelular/genética , Proteínas de Membrana/genética , Polimorfismo de Nucleotídeo Único/genética , Característica Quantitativa Herdável , Animais , Sequência de Bases , Búfalos/genética , China , Éxons/genética , Frequência do Gene/genética , Dados de Sequência Molecular , Fenótipo , Reação em Cadeia da Polimerase , Polimorfismo Conformacional de Fita SimplesRESUMO
As a zinc-finger protein, PR domain containing 16 (PRDM16) controls brown fat determination by stimulating brown fat-selective genes expression while suppressing the expression of genes selective for white fat cells, whose mutations were associated with myelodysplastic syndrome (MDS) and leukemogenesis in human and murine model of leukemia. To date, no polymorphisms of PRDM16 gene in bovine had been reported. Herein, PCR-SSCP and DNA sequencing methods were employed to screen the genetic variation within PRDM16 gene in 1031 Chinese indigenous bovine. The results revealed two novel silent mutations: XM_001788152: m.1641T>C (547aa), 1881G>A (627aa). Hence, we described the PvuII and HaeIII forced PCR-RFLP methods for detecting these mutations, respectively. In the forced PCR-RFLP analysis with PvuII, the frequencies of bovine PRDM16-C allele varied from 0.044 to 0.506 in four Chinese native breeds. In the forced PCR-RFLP analysis with HaeIII, the frequencies of bovine PRDM16-G allele were 0.474, 0.494, 0.576 and 0.906 for Jiaxian (JX), Nanyang (NY), Qinchuan (QC) and Chinese Holstein (CH) population. Significant statistical differences between genotypic frequencies implied that both of the polymorphic loci were significantly associated with cattle breeds by the chi square test (chi2 = 190.058, P < 0.001 and chi2 = 118.239, P < 0.001 for PvuII; chi2 = 209.842, P < 0.001 and chi2 = 108.711, P < 0.001 for HaeIII). The associations of the PvuII and HaeIII forced PCR-RFLPs of bovine PRDM16 loci with growth traits were analyzed in Nanyang breed. The two SNPs were associated with body weight and average daily gain in Nanyang aged 12 months, individuals with genotype TT and AA showed significantly better body weight (P < 0.05) and average daily gain (P < 0.01) at 12 months, respectively.
Assuntos
Bovinos/crescimento & desenvolvimento , Bovinos/genética , Fases de Leitura Aberta/genética , Polimorfismo de Nucleotídeo Único/genética , Característica Quantitativa Herdável , Fatores de Transcrição/genética , Animais , Sequência de Bases , Cruzamento , China , Frequência do Gene/genética , Loci Gênicos/genética , Genótipo , Dados de Sequência Molecular , Análise de Sequência de DNARESUMO
OBJECTIVES: This study assessed the effectiveness of a family planning intervention with and without husband's participation in reducing pregnancy and abortion rates in Shanghai, China. METHODS: In this 3-arm randomized trial among 1800 nonsterilized married women, educational interventions targeting both spouses and targeting the wife only were compared with usual family planning care. RESULTS: Among women not using intrauterine devices (IUDs), the intervention with husband's participation had an effect in reducing pregnancy rates (adjusted odds ratio [OR] = 0.36, 95% confidence interval [CI] = 0.12, 1.1) and abortion rates (adjusted OR = 0.29, CI = 0.09, 0.94) compared with control subjects, and a significant effect in reducing pregnancy rates (adjusted OR = 0.29, CI = 0.10, 0.85) and abortion rates (adjusted OR = 0.24, CI = 0.07, 0.77) compared with wife-only subjects. CONCLUSIONS: Family planning interventions involving husbands may reduce pregnancy and abortion rates among non-IUD users.