RESUMO
Free oligosaccharides (fOSs) are soluble oligosaccharide species generated during N-glycosylation of proteins. Although little is known about fOS metabolism, the recent identification of NGLY1 deficiency, a congenital disorder of deglycosylation (CDDG) caused by loss of function of an enzyme involved in fOS metabolism, has elicited increased interest in fOS processing. The catabolism of fOSs has been linked to the activity of a specific cytosolic mannosidase, MAN2C1, which cleaves α1,2-, α1,3-, and α1,6-mannose residues. In this study, we report the clinical, biochemical, and molecular features of six individuals, including two fetuses, with bi-allelic pathogenic variants in MAN2C1; the individuals are from four different families. These individuals exhibit dysmorphic facial features, congenital anomalies such as tongue hamartoma, variable degrees of intellectual disability, and brain anomalies including polymicrogyria, interhemispheric cysts, hypothalamic hamartoma, callosal anomalies, and hypoplasia of brainstem and cerebellar vermis. Complementation experiments with isogenic MAN2C1-KO HAP1 cells confirm the pathogenicity of three of the identified MAN2C1 variants. We further demonstrate that MAN2C1 variants lead to accumulation and delay in the processing of fOSs in proband-derived cells. These results emphasize the involvement of MAN2C1 in human neurodevelopmental disease and the importance of fOS catabolism.
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Cistos do Sistema Nervoso Central/genética , Defeitos Congênitos da Glicosilação/genética , Hamartoma/genética , Deficiência Intelectual/genética , Oligossacarídeos/metabolismo , Peptídeo-N4-(N-acetil-beta-glucosaminil) Asparagina Amidase/deficiência , Polimicrogiria/genética , alfa-Manosidase/genética , Adolescente , Alelos , Tronco Encefálico/metabolismo , Tronco Encefálico/patologia , Linhagem Celular Tumoral , Cistos do Sistema Nervoso Central/metabolismo , Cistos do Sistema Nervoso Central/patologia , Vermis Cerebelar/metabolismo , Vermis Cerebelar/patologia , Criança , Pré-Escolar , Defeitos Congênitos da Glicosilação/metabolismo , Defeitos Congênitos da Glicosilação/patologia , Feminino , Feto , Glicosilação , Hamartoma/metabolismo , Hamartoma/patologia , Humanos , Hipotálamo/metabolismo , Hipotálamo/patologia , Deficiência Intelectual/metabolismo , Deficiência Intelectual/patologia , Leucócitos/metabolismo , Leucócitos/patologia , Masculino , Manose/metabolismo , Peptídeo-N4-(N-acetil-beta-glucosaminil) Asparagina Amidase/genética , Peptídeo-N4-(N-acetil-beta-glucosaminil) Asparagina Amidase/metabolismo , Polimicrogiria/metabolismo , Polimicrogiria/patologia , Língua/metabolismo , Língua/patologia , alfa-Manosidase/deficiênciaRESUMO
We describe the phenotype of 22 male patients (20 probands) carrying a hemizygous missense variant in MED12. The phenotypic spectrum is very broad ranging from nonspecific intellectual disability (ID) to the three well-known syndromes: Opitz-Kaveggia syndrome, Lujan-Fryns syndrome, or Ohdo syndrome. The identified variants were randomly distributed throughout the gene (p = 0.993, χ2 test), but mostly outside the functional domains (p = 0.004; χ2 test). Statistical analyses did not show a correlation between the MED12-related phenotypes and the locations of the variants (p = 0.295; Pearson correlation), nor the protein domain involved (p = 0.422; Pearson correlation). In conclusion, establishing a genotype-phenotype correlation in MED12-related diseases remains challenging. Therefore, we think that patients with a causative MED12 variant are currently underdiagnosed due to the broad patients' clinical presentations.
Assuntos
Blefarofimose , Deficiência Intelectual , Deficiência Intelectual Ligada ao Cromossomo X , Masculino , Humanos , Complexo Mediador/genética , Deficiência Intelectual Ligada ao Cromossomo X/genética , Deficiência Intelectual/diagnóstico , Deficiência Intelectual/genética , Blefarofimose/genética , Mutação de Sentido Incorreto/genética , Fenótipo , SíndromeRESUMO
Intellectual disability (ID) can be caused by non-genetic and genetic factors, the latter being responsible for more than 1700 ID-related disorders. The broad ID phenotypic and genetic heterogeneity, as well as the difficulty in the establishment of the inheritance pattern, often result in a delay in the diagnosis. It has become apparent that massive parallel sequencing can overcome these difficulties. In this review we address: (i) ID genetic aetiology, (ii) clinical/medical settings testing, (iii) massive parallel sequencing, (iv) variant filtering and prioritization, (v) variant classification guidelines and functional studies, and (vi) ID diagnostic yield. Furthermore, the need for a constant update of the methodologies and functional tests, is essential. Thus, international collaborations, to gather expertise, data and resources through multidisciplinary contributions, are fundamental to keep track of the fast progress in ID gene discovery.
Assuntos
Deficiência Intelectual , Genômica , Humanos , Deficiência Intelectual/diagnóstico , Deficiência Intelectual/genéticaRESUMO
Identifying cracks in the incipient state is essential to prevent the failure of engineering structures. Detection methods relying on the analysis of the changes in modal parameters are widely used because of the advantages they present. In our previous research, we found that eigenfrequencies were capable of indicating the position and depth of damage when sufficient vibration modes were considered. The damage indicator we developed was based on the relative frequency shifts (RFS). To calculate the RFSs for various positions and depths of a crack, we established a mathematical relation that involved the squared modal curvatures in the healthy state and the deflection of the healthy and damaged beam under dead mass, respectively. In this study, we propose to calculate the RFS for beams with several cracks by applying the superposition principle. We demonstrate that this is possible if the cracks are far enough from each other. In fact, if the cracks are close to each other, the superposition method does not work and we distinguish two cases: (i) when the cracks affect the same beam face, the frequency drop is less than the sum of the individual frequency drops, and (ii) on the contrary, cracks on opposite sides cause a decrease in frequency, which is greater than the sum of the frequency drop due to individual damage. When the RFS curves are known, crack assessment becomes an optimization problem, the cost function being the distance between the measured RFSs and all possible RFSs for several vibration modes. Thus, the RFS constitutes a benchmark that characterizes damage using only the eigenfrequencies. We can accurately locate multiple cracks and estimate their severity through experiments and thus prove the reliability of the proposed method.
Assuntos
Algoritmos , Vibração , Reprodutibilidade dos TestesRESUMO
BACKGROUND: We describe a female infant with Fragile-X syndrome, with a fully expanded FMR1 allele and preferential inactivation of the homologous X-chromosome carrying a de novo deletion. This unusual and rare case demonstrates the importance of a detailed genomic approach, the absence of which could be misguiding, and calls for reflection on the current clinical and diagnostic workup for developmental disabilities. CASE PRESENTATION: We present a female infant, referred for genetic testing due to psychomotor developmental delay without specific dysmorphic features or relevant family history. FMR1 mutation screening revealed a methylated full mutation and a normal but inactive FMR1 allele, which led to further investigation. Complete skewing of X-chromosome inactivation towards the paternally-inherited normal-sized FMR1 allele was found. No pathogenic variants were identified in the XIST promoter. Microarray analysis revealed a 439 kb deletion at Xq28, in a region known to be associated with extreme skewing of X-chromosome inactivation. CONCLUSIONS: Overall results enable us to conclude that the developmental delay is the cumulative result of a methylated FMR1 full mutation on the active X-chromosome and the inactivation of the other homologue carrying the de novo 439 kb deletion. Our findings should be taken into consideration in future guidelines for the diagnostic workup on the diagnosis of intellectual disabilities, particularly in female infant cases.
Assuntos
Proteína do X Frágil da Deficiência Intelectual/genética , Síndrome do Cromossomo X Frágil/genética , Genômica/métodos , Deleção de Sequência , Inativação do Cromossomo X , Cromossomos Humanos X/genética , Metilação de DNA , Feminino , Testes Genéticos , Humanos , Lactente , Mutação , Análise de Sequência com Séries de Oligonucleotídeos/métodos , Herança Paterna , LinhagemRESUMO
Fragile X syndrome (FXS), the most common cause of inherited intellectual disability, is due to the expansion over 200 CGGs and methylation of this polymorphic region, in the 5'-UTR (untranslated region) of FMR1 (Xq27.3). We have identified four FXS mosaic males: M1-(CGG)35/(CGG)>200; M2-(CGG)26/(CGG)>200; M3-(CGG)39/(CGG)>200; and M4-(CGG)18/(CGG)125/(CGG)>200. After genotyping their respective mothers, we suggested that normal alleles of these patients resulted from post-zygotic contractions of full expansions. The detection of these four rare independent cases led us to hypothesize the existence of a large-contraction predisposing haplotype in our population. Next, we questioned whether other normal pure CGGs would have arisen through similar contractions from fully expanded alleles. To address these questions, we identified stable single-nucleotide polymorphism (SNP) lineages and related short tandem repeat (STR) haplotypes (DXS998-DXS548-FRAXAC1-FRAXAC2) of the four mosaics, 123 unrelated FXS patients and 212 controls. An extended flanking haplotype (34-44-38-336) shared by mosaics from lineage A suggested a risk lineage-specific haplotype more prone to large contractions. Other normal pure FMR1 alleles from this SNP background also shared phylogenetically close STR haplotypes, although a single (CGG)exp>(CGG)24 contraction or the loss of AGG interruptions may explain their origin. In both scenarios, multistep FMR1 mutations involving the gain or loss of several CGGs seem to underlie the evolution of the repeat.
Assuntos
Proteína do X Frágil da Deficiência Intelectual/genética , Síndrome do Cromossomo X Frágil/genética , Repetições de Microssatélites/genética , Polimorfismo de Nucleotídeo Único/genética , Repetições de Trinucleotídeos/genética , Criança , Pré-Escolar , Frequência do Gene , Haplótipos/genética , Humanos , Masculino , Pessoa de Meia-IdadeRESUMO
Phosphoprotein phosphatase 1 (PPP1) catalytic subunit gamma 2 (PPP1CC2), a PPP1 isoform, is largely restricted to testicular germ cells and spermatozoa. The key to understanding PPP1 regulation in male germ cells lies in the identification and characterisation of its interacting partners. This study was undertaken to determine the expression patterns of the several ankyrin repeat protein variant 2 (SARP2), a PPP1-interacting protein, in testis and spermatozoa. SARP2 was found to be highly expressed in testis and spermatozoa, and its interaction with human spermatozoa endogenous PPP1CC2 was confirmed by immunoprecipitation. Expression analysis by RT-qPCR revealed that SARP2 and PPP1CC2 mRNA levels were significantly higher in the spermatocyte fraction. However, microscopy revealed that SARP2 protein was only present in the nucleus of elongating and mature spermatids and in spermatozoa. In spermatozoa, SARP2 was prominently expressed in the connecting piece and flagellum, as well as, to a lesser extent, in the acrosome. A yeast two-hybrid approach was used to detect SARP2-interacting proteins and a relevant interaction with a novel sperm-associated antigen 9 (SPAG9) variant, a testis and spermatozoa-specific c-Jun N-terminal kinase-binding protein, was validated in human spermatozoa. Given the expression pattern of SARP2 and its association with PPP1CC2 and SPAG9, it may play a role in spermiogenesis and sperm function, namely in sperm motility and the acrosome reaction.
Assuntos
Repetição de Anquirina , Proteína Fosfatase 1/fisiologia , Espermatozoides/fisiologia , Testículo/fisiologia , Proteínas Adaptadoras de Transdução de Sinal/fisiologia , Humanos , Masculino , Motilidade dos Espermatozoides , EspermatogêneseRESUMO
Penetrating neck injuries comprise 5-10% of traumatic injuries in adults and can cause immediate life-threatening compromise. Performing awake fibreoptic intubation in cooperative patients when airway management is not time critical has been suggested as a method of securing these potentially complicated airways. We report a case of a male in his 20s who presented to the emergency service with neck trauma following a bicycle road accident. With the exception of a wound in the neck region, there were no alarming distress signs or symptoms of airway endangerment. Imagiological evaluation revealed a rupture of the right lateral tracheal wall. He was referred for urgent surgery. We performed intubation with video laryngoscopy assisted by a neck surgery team, keeping the patient breathing spontaneously and under deep sedation. After advancing the tube through the vocal cords, the surgeon explored the cervical wound, guiding the tube through the trachea. Keeping spontaneous ventilation and advancing the tracheal tube beyond the lesion under visualization is essential when managing a traumatized airway. Tracheal intubation using video laryngoscopy, assisted by a neck surgeon guiding the tube, and avoiding creation of a false passage can be a safe alternative to fibreoptic intubation in selected cases of tracheal laceration.
RESUMO
X-chromosome inactivation (XCI) is a developmental process to compensate the imbalance in the dosage of X-chromosomal genes in females. A skewing of the XCI pattern may suggest a carrier status for an X-linked disease or explain the presence of a severe phenotype. In these cases, it is important to determine the XCI pattern, conventionally using the gold standard Human Androgen-Receptor Assay (HUMARA), based on the analysis of the methylation status at a polymorphic CAG region in the first exon of the human androgen receptor gene (AR). The aim of this study was to evaluate whether the methylation status of the fragile mental retardation protein translational regulator gene (FMR1) can provide an XCI pattern similar to that obtained by HUMARA. A set of 48 female carriers of FMR1 gene normal-sized alleles was examined using two assays: HUMARA and a FMR1 methylation PCR (mPCR). Ranges were defined to establish the XCI pattern using the methylation pattern of the FMR1 gene by mPCR. Overall, a 77% concordance of the XCI patterns was obtained between the two assays, which led us to propose a set of key points and a stepwise analysis towards obtaining an accurate result for the XCI pattern and to minimize the underlying pitfalls.
Assuntos
Metilação de DNA , Inativação do Cromossomo X , Animais , Cromossomos , Metilação de DNA/genética , Feminino , Heterozigoto , Masculino , Fenótipo , Inativação do Cromossomo X/genéticaRESUMO
Ritscher-Schinzel syndrome (RTSCS) is a rare genetic condition characterized by peculiar craniofacial features and cerebellar and cardiovascular malformations. To date, four genes are implicated in this condition. The first two genes described were the autosomal recessive inherited gene WASHC5 associated with Ritscher-Schinzel syndrome 1 (RTSCS1), and CCDC22, an X-linked recessive gene causing Ritscher-Schinzel syndrome 2 (RTSCS2). In recent years, two other genes have been identified: VPS35L (RTSCS3) and DPYSL5 (RTSCS4). Only few patients with a molecular diagnosis of RTSCS have been reported, leaving the phenotypical spectrum and genotype-phenotype correlations ill-defined. We expand the number of genetically confirmed patients with RTSCS1 and 2; reporting three live born and three terminated pregnancies from two unrelated families. Four siblings carried compound heterozygous variants in WASHC5 while two siblings harboured a hemizygous CCDC22 variant. The most common findings in all patients were craniofacial dysmorphism, particularly macrocephaly, down slanted palpebral fissures and low set-ears. Developmental delay, intellectual disability and ataxic gait were present in all patients. One of the patients with the CCDC22 variant presented pubertas tarda. Elevation of nuchal translucency was observed in the first trimester ultrasound in three foetuses with compound heterozygous variants in WASHC5. None of the patients had epilepsy. The pre- and postnatal findings of this cohort expand the known phenotype of RTSCS1 and 2, with direct impact on postnatal outcome, management, and familial counseling.
Assuntos
Anormalidades Craniofaciais , Síndrome de Dandy-Walker , Feminino , Humanos , Gravidez , Anormalidades Múltiplas , Anormalidades Craniofaciais/genética , Síndrome de Dandy-Walker/genética , Comunicação Interatrial , Hidrolases/genética , Proteínas Associadas aos Microtúbulos/genética , Fenótipo , Proteínas/genética , SíndromeRESUMO
Ankle tuberculosis is a relatively rare condition and may develop after hematogenous dissemination from the pulmonary origin, particularly in cases of immunosuppression. Both pregnancy and delivery are relatively immunosuppressive states, and immune modulations during these periods can contribute to the pathogenesis of disseminated tuberculosis. A 26-year-old mother presented with severe, continuous, and debilitating pain in the left ankle, lasting for three months after delivery and associated with fever. Inspection demonstrated ankle swelling and redness, with a cold and cyanotic forefoot. Ankle radiograph and musculoskeletal ultrasound evaluation were obtained. Tibiotalar joint arthrocentesis revealed purulent liquid suggestive of septic arthritis and an emergent arthroscopic washout of the ankle was performed. The synovial mycobacterial culture was posteriorly positive and the diagnosis established was both pulmonary and osteoarticular tuberculosis. A comprehensive rehabilitation program was then implemented to achieve maximum functional gains. This report presents a rare case of ankle tuberculosis diagnosed in the postpartum period. Early evaluation, treatment, and adequate rehabilitation interventions can be crucial to promote functionality and enhance the quality of life.
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Over 100 X-linked intellectual disability genes have been identified, with triplet repeat expansions at the FMR1 (FRAXA) and AFF2 (FRAXE) genes being the causative agent in two of them. The absence of FRAXE pathognomonic features hampers early recognition, delaying testing and molecular confirmation. Hence, our laboratory uses a multiplex PCR-based strategy to genotype both FRAXA and FRAXE. However, AFF2 expansions are missed giving rise to an uninformative result in around 20% of female samples. To rule out undetected expansions and confirm homozygosity Southern blot analysis is performed being labour- and resource-intensive. The aim of this study is to develop a timely and economic triplet-primed amplification (TP-PCR) screening strategy to size the AFF2 GCC repeat and accurately assess homozygosity as well as pinpoint multiplex-PCR false negatives in female samples. In order to achieve this, validation was performed in a cohort of 500 females with a previous uninformative FRAXE PCR result. Interestingly, the presence of a T > C SNP (rs868949662), contiguous to the GCC repetitive tract, allows triplet primer binding in two additional repeats, increasing the discrimination power of the TP-PCR assay in heterozygous and homozygous samples. Twelve alleles outside the normal range were recognized: eight intermediate and four premutated, which seems relevant considering the rarity of the AFF2 expansions. All genotypes are concordant with that obtained by Southern blotting, confirming this as a strict, reproducible and low-cost homozygosity screening strategy that enables the identification of small expanded alleles missed by the routine multiplex-PCR due to allele dropout. Overall, this assay is capable of spotting multiplex-PCR false negatives besides identifying alleles up to > 80 GCC repeats. Furthermore, the occurrence of intermediate repeat sizes with unexpected frequency, introduces new areas of clinical research in this cohort in understanding these less explored AFF2 repeat sizes and newly associated phenotypes.
Assuntos
Deficiência Intelectual/diagnóstico , Reação em Cadeia da Polimerase Multiplex/métodos , Proteínas Nucleares/genética , Estudos de Coortes , Feminino , Proteína do X Frágil da Deficiência Intelectual/análise , Proteína do X Frágil da Deficiência Intelectual/genética , Síndrome do Cromossomo X Frágil/diagnóstico , Síndrome do Cromossomo X Frágil/genética , Genes Ligados ao Cromossomo X , Estudos de Associação Genética , Humanos , Deficiência Intelectual/genética , Masculino , Proteínas Nucleares/análise , Portugal , Expansão das Repetições de Trinucleotídeos/genética , Repetições de Trinucleotídeos/genéticaRESUMO
We describe an infant female with a syndromic neurodevelopmental clinical phenotype and increased chromosome instability as cellular phenotype. Genotype characterization revealed heterozygous variants in genes directly or indirectly linked to DNA repair: a de novo X-linked HDAC8 pathogenic variant, a paternally inherited FANCG pathogenic variant and a maternally inherited BRCA2 variant of uncertain significance. The full spectrum of the phenotype cannot be explained by any of the heterozygous variants on their own; thus, a synergic contribution is proposed. Complementation studies showed that the FANCG gene from the Fanconi Anaemia/BRCA (FA/BRCA) DNA repair pathway was impaired, indicating that the variant in FANCG contributes to the cellular phenotype. The patient's chromosome instability represents the first report where heterozygous variant(s) in the FA/BRCA pathway are implicated in the cellular phenotype. We propose that a multigenic contribution of heterozygous variants in HDAC8 and the FA/BRCA pathway might have a role in the phenotype of this neurodevelopmental disorder. The importance of these findings may have repercussion in the clinical management of other cases with a similar synergic contribution of heterozygous variants, allowing the establishment of new genotype-phenotype correlations and motivating the biochemical study of the underlying mechanisms.
Assuntos
Proteína BRCA1/genética , Proteína BRCA2/genética , Instabilidade Cromossômica , Proteína do Grupo de Complementação G da Anemia de Fanconi/genética , Histona Desacetilases/genética , Transtornos do Neurodesenvolvimento/patologia , Fenótipo , Proteínas Repressoras/genética , Dano ao DNA , Reparo do DNA , Feminino , Humanos , Recém-Nascido , Mutação , Transtornos do Neurodesenvolvimento/genéticaRESUMO
The polymorphic trinucleotide repetitive region in the FMR1 gene 5'UTR contains AGG interspersions, particularly in normal-sized alleles (CGG < 45). In this range repetitive stretches are typically interrupted once or twice, although alleles without or with three or more AGG interspersions can also be observed. AGG interspersions together with the total length of the repetitive region confer stability and hinder expansion to pathogenic ranges: either premutation (55 < CGG < 200) or full mutation (CGG > 200). The AGG interspersions have long been identified as one of the most important features of FMR1 repeat stability, being particularly important to determine expansion risk estimates in female premutation carriers. We sought to compute the combined AGG interspersion numbers and patterns, aiming to define FMR1 repetitive tract complexity combinations. A mathematical model, the first to compute this cumulative effect, was developed and validated using data from 131 young and healthy females. Plotting of their allelic complexity enabled the identification of two statistically distinct groups - equivalent and dissimilar allelic combinations. The outcome, a numerical parameter designated allelic score, depicts the repeat substructure of each allele, measuring the allelic complexity of the FMR1 gene including the AGGs burden, thus allowing new behavioral scrutiny of normal-sized alleles in females.
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Prostate cancer (PCa) treatment remains challenging, especially in advanced stages, where the lack of sensitivity and specificity of available biomarkers makes it difficult to establish an accurate prognosis. Therefore, it is imperative to study PCa biology to identify key molecules that can improve PCa management. In this study, eight prostate tumor tissues and paired normal tissues were analyzed using two approaches-Fourier-transform infrared (FT-IR) spectroscopy for spectroscopic profiling of biomolecules and antibody microarray for signaling proteins-with the main goal of identifying metabolic and proteomic changes that enable the distinction between normal and tumor conditions. Principal component analysis of FT-IR spectra revealed different spectroscopic signals for each condition. The most relevant changes in prostate tumor tissues identified by FT-IR were dysregulation in lipid metabolism, lower polysaccharide and glycogen content, higher nucleic acid content, and increased protein phosphorylation. Using an antibody microarray, 42 proteins were identified as differentially regulated between the two conditions; 14 of those revealed changes in their phosphorylation status. These proteins include transcription factors and kinases and constitute a highly-interconnected interaction network. Altogether, our data reveal metabolic and proteomic alterations that may be of interest in future translational studies aimed at establishing PCa prognosis and treatment. SIGNIFICANCE: Prostate tumor tissues and adjacent benign tissues were analyzed using two approaches-Fourier-transform infrared (FT-IR) spectroscopy for biomolecules and an antibody microarray for signaling proteins, which allowed to identify a panel of metabolic and proteomic alterations that may be of interest in future translational studies to enable the distinction between normal and tumor conditions.
Assuntos
Próstata , Proteômica , Carcinogênese , Humanos , Masculino , Análise de Componente Principal , Espectroscopia de Infravermelho com Transformada de FourierRESUMO
Autosomal Recessive Spinocerebellar Ataxia 20, SCAR20, is a rare condition characterized by intellectual disability, lack of speech, ataxia, coarse facies and macrocephaly, caused by SNX14 variants. While all cases described are due to homozygous variants that generally result in loss of protein, so far there are no other cases of reported compound heterozygous variants. Here we describe the first non-consanguineous SCAR20 family, the second Portuguese, with two siblings presenting similar clinical features caused by compound heterozygous SNX14 variants: NM_001350532.1:c.1195C>T, p.(Arg399*) combined with a novel complex genomic rearrangement. Quantitative PCR (Q-PCR), long-range PCR and sequencing was used to elucidate the region and mechanisms involved in the latter: two deletions, an inversion and an AG insertion: NM_001350532.1:c.[612+3028_698-2759del;698-2758_698-516inv;698-515_1171+1366delinsAG]. In silico analyses of these variants are in agreement with causality, enabling a genotype-phenotype correlation in both patients. Clinical phenotype includes dystonia and stereotypies never associated with SCAR20. Overall, this study allowed to extend the knowledge of the phenotypic and mutational spectrum of SCAR20, and to validate the role of Sorting nexin-14 in a well-defined neurodevelopmental syndrome, which can lead to cognitive impairment. We also highlight the value of an accurate clinical evaluation and deep phenotyping to disclose the molecular defect underlying highly heterogeneous condition such as intellectual disability.
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In a patient with Usher syndrome and atypical muscle complaints, we have identified two separate variants in MYO7A andNEB genes by exome sequencing. The homozygous variants in these two recessive genes could explain the full phenotype of our patient.
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X-linked Opitz G/BBB syndrome (XLOS) is a multisystemic congenital condition, caused by mutations in the midline-1 gene (MID1), characterized by a large inter- and intrafamilial phenotypic variability and often associated with intellectual disability (ID). We report clinical, genetic, and molecular findings in 4 patients with typical XLOS dysmorphic features belonging to 2 unrelated families. Two novel pathogenic loss-of-function MID1 variants, a maternally inherited c.1656del and a de novo c.1215_1228dup, were identified. Subsequently, we performed a genotype-phenotype analysis using data from 91 male XLOS patients. To test the mutation impact on the phenotype; the type of mutation, the MID1-impaired domain and function were compared with the presence of each of the major clinical features (hypertelorism, clefts of the lip and/or palate, laryngo-tracheo-esophageal abnormalities, hypospadias and ID) and minor clinical features (brain, heart, and anal defects). No statistically significant correlation was found with these features. Further investigations, as well as exhaustive and unequivocal phenotyping, may be required to improve our knowledge of the biological mechanisms underlying this syndrome and to provide more adequate disease management.
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O presente estudo pretendeu comparar a intervenção do Jogador Líbero e dos Recebedores Prioritários, ao nível da eficácia e das zonas de recepção do saque, bem como associar as zonas de recepção com a eficácia da recepção, no Voleibol Feminino Sênior. A amostra consistiu em 683 ações de recepção,retiradas dos seis jogos realizados pelas equipes participantes na Poule I de apuramento para o campeonato da Europa de 2005 de Voleibol feminino no escalão sênior B (Bielorússia, Hungria, Portugal e Dinamarca). A recolha de dados foi realizada através da gravação em sistema audiovisual, sendo posteriormente digitalizadas as imagens para se controlar o rigor e precisão da observação. Os procedimentosestatísticos basearam-se na análise descritiva e inferencial, pela aplicação do teste de qui-quadrado, na comparação entre grupos (jogador recebedor) e associação entre variáveis (zona e eficácia da recepção) e na análise de correspondências simples (ANACOR). As observações cumpriram os requisitos de fiabilidade para serem utilizadas como ferramenta científica, tanto pela percentagem de acordos,como pela estatística Kappa de Cohen. O presente estudo não confirmou a influência do Líbero no incremento da eficácia da recepção comparativamente a cada um dos Recebedores Prioritários e nem sequer destes em relação aos outros jogadores não especialistas. O Líbero recebe significativamentemais em Z6 e os Recebedores prioritários em Z5. Não se registraram associações significativas entre aszonas de intervenção e a eficácia da recepção, podendo-se dever mais ao modelo topográfico utilizado, do que à possibilidade da zona de recepção não interferir com a eficácia da recepção. Porquanto, a divisão regulamentar do terreno de jogo em seis zonas, por não espelhar a funcionalidade do jogo, podeconstituir um modelo inapropriado de avaliação, devendo ser confirmado em posteriores estudos.
This study aimed to compare the action of Libero Player and Priority Receivers, regarding to efficacyand receive zones and also established the relationship between receive zones and the reception outcomein female Senior Volleyball. The sample was composed by 683 receptions in 6 games played by Women National Teams included on the Poule I at the European Championship 2005 qualification (Belarus,Hungary, Portugal and Denmark). The data were gathered through video camera. In order to increase the accuracy and objectivity of the images, they were digitalized. Descriptive statistics were performedfor all variables and it was used the qui-square test (c2) to compare the groups (received player) and theassociation between variables (zone and reception efficacy). Kappa of Cohen analysis and percentage of agreement demonstrated good intra-observer and inter-observer reliability which confirmed theaccuracy of observations. Our data did not confirm the influence of Libero player to increase the reception efficacy comparatively to which one of the priority receivers or with the other non-specialist receivers.However, Libero player received significantly more on the Z6 and the Priority Receivers on the Z5. Inaddition, our results did not found a significant relationship between intervention-zones and deception efficacy. The topographical model used might have been the primary reason for the absence of association observed, and not the fact that reception-zone does not interfere on reception efficacy. These resultssuggest that the current six-zone, equal division of the playing field, does not support the real game functionality, which indicates that it is an inappropriate method for assessment and should beconfirmed in further studies.