• MeSH
• Bartterův syndrom * komplikace   diagnóza   MeSH
• lidé MeSH
• paralýza diagnóza   etiologie   MeSH
• svalová hypotonie diagnóza   etiologie   MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH

INTRODUCTION: Hearing loss is the most frequent sensory disorder and is genetically extremely heterogeneous. By far the most frequent cause of nonsyndromic autosomal recessive hearing loss (AR-NSHL) are biallelic pathogenic mutations in the GJB2 gene causing DFNB1. The worldwide search for the second most common type of AR-NSHL took almost two decades. Recently reported alterations (mostly deletions) of the STRC gene, also named DFNB16, seem to be the second most frequent cause of AR-NSHL. Genetic testing of STRC is very challenging due to the highly homologous pseudogene. Anecdotal evidence from single patients shows that STRC mutations have their typical audiological findings and patients usually have moderate hearing loss. The aim of this study is to discover if audiological findings in patients with biallelic pathogenic mutations affecting STRC have the characteristic features and shape of audiological curves and if there are genotype/phenotype correlations in relation to various types of STRC mutations. METHODS: Eleven hearing loss patients with pathogenic mutations on both alleles of the STRC gene were detected during routine genetic examination of AR-NSHL patients. Audiological examination consisted of pure tone audiometry, stapedial reflexes, tympanometry and otoacoustic emission tests. RESULTS: The threshold of pure tone average (PTA) was 46 dB and otoacoustic emissions were not detectable in these DFNB16 patients. All patients were without vestibular irritation or asymmetry. CONCLUSION: Moderate sensorineural hearing loss is typical for DFNB16-associated hearing loss and there are no significant differences in audiological phenotypes among different types of mutations affecting STRC.

• MeSH
• alely MeSH
• audiometrie MeSH
• dítě MeSH
• dospělí MeSH
• genetické asociační studie MeSH
• hluchota genetika   MeSH
• jednonukleotidový polymorfismus genetika   MeSH
• konexiny genetika   MeSH
• lidé MeSH
• membránové proteiny genetika   MeSH
• mezibuněčné signální peptidy a proteiny genetika   MeSH
• mladiství MeSH
• mladý dospělý MeSH
• mutace genetika   MeSH
• percepční nedoslýchavost diagnóza   genetika   MeSH
• polymerázová řetězová reakce MeSH
• sekvenční delece genetika   MeSH
• sluchové testy MeSH
• Check Tag
• dítě MeSH
• dospělí MeSH
• lidé MeSH
• mladiství MeSH
• mladý dospělý MeSH
• mužské pohlaví MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH

Kabuki syndrome is mainly caused by dominant de-novo pathogenic variants in the KMT2D and KDM6A genes. The clinical features of this syndrome are highly variable, making the diagnosis of Kabuki-like phenotypes difficult, even for experienced clinical geneticists. Herein we present molecular genetic findings of causal genetic variation using array comparative genome hybridization and a Mendeliome analysis, utilizing targeted exome analysis focusing on regions harboring rare disease-causing variants in Kabuki-like patients which remained KMT2D/KDM6A-negative. The aCGH analysis revealed a pathogenic CNV in the 14q11.2 region, while targeted exome sequencing revealed pathogenic variants in genes associated with intellectual disability (HUWE1, GRIN1), including a gene coding for mandibulofacial dysostosis with microcephaly (EFTUD2). Lower values of the MLL2-Kabuki phenotypic score are indicative of Kabuki-like phenotype (rather than true Kabuki syndrome), where aCGH and Mendeliome analyses have high diagnostic yield. Based on our findings we conclude that for new patients with Kabuki-like phenotypes it is possible to choose a specific molecular testing approach that has the highest detection rate for a given MLL2-Kabuki score, thus fostering more precise patient diagnosis and improved management in these genetically- and phenotypically heterogeneous clinical entities.

• MeSH
• dítě MeSH
• DNA vazebné proteiny genetika   MeSH
• elongační faktory genetika   MeSH
• exom MeSH
• fenotyp * MeSH
• genetická heterogenita * MeSH
• genotyp * MeSH
• histondemethylasy genetika   MeSH
• jaderné proteiny genetika   MeSH
• krevní nemoci diagnóza   genetika   patofyziologie   MeSH
• lidé MeSH
• lidské chromozomy, pár 14 MeSH
• malý jaderný ribonukleoprotein U5 genetika   MeSH
• mandibulofaciální dysostóza genetika   MeSH
• mentální retardace genetika   MeSH
• mikrocefalie genetika   MeSH
• mnohočetné abnormality diagnóza   genetika   patofyziologie   MeSH
• nádorové proteiny genetika   MeSH
• nádorové supresorové proteiny genetika   MeSH
• obličej abnormality   patofyziologie   MeSH
• předškolní dítě MeSH
• proteiny nervové tkáně genetika   MeSH
• receptory N-methyl-D-aspartátu genetika   MeSH
• srovnávací genomová hybridizace MeSH
• ubikvitinligasy genetika   MeSH
• vestibulární nemoci diagnóza   genetika   patofyziologie   MeSH
• vysoce účinné nukleotidové sekvenování MeSH
• Check Tag
• dítě MeSH
• lidé MeSH
• mužské pohlaví MeSH
• předškolní dítě MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• kazuistiky MeSH