Mutations in mitochondrial genome have been found to be associated with hearing loss. Of these, the mitochondrial 12S rRNA and tRNASer(UCN) are the hot spots for pathogenic mutations associated with deafness. To understand the putative role of mitochondrial DNA (mtDNA) mutations in hearing loss, we recently initiated a mutational screening for the mtDNA mutations in Hangzhou area from Zhejiang ...

Hearing loss is the most common inherited sensorial deficiency in humans; about 1 in 1000 children suffer from severe or profound hearing loss at birth. Mutations in the GJB2 gene are the most common cause of prelingual, non-syndromic autosomal recessive deafness in many populations; the c.35delG mutation is the most common in Caucasian populations. The frequency of the c.35delG mutation was es...

BACKGROUND Non-syndromic hearing loss is the most genetically heterogeneous trait known in humans. To date, 51 loci for autosomal dominant non-syndromic sensorineural hearing loss (NSSHL) have been identified by linkage analysis. OBJECTIVE To investigate the genes involved in a Dutch family with NSSHL. METHODS Linkage analysis in a large Dutch pedigree with progressive bilateral loss of the...

UNLABELLED Hearing loss is a multifaceted condition with many etiologies, among which genetic mutation is. Therefore, it is important to connect audiological investigation to etiological diagnosis. AIM this study aims to establish the audiological and genetic profiles of three non-syndromic children with sensorineural hearing loss. MATERIALS AND METHOD three brothers aged 3, 5 and 16 were e...

background: mutations in the gjb2 gene encoding connexin 26 protein, are the main cause for autosomal recessive and sporadic non syndromic hearing loss in many populations. here, we have taken together and reviewed results from our six previous publications, our unpublished data from ten iranian provinces, as well as data from two previous mutation reports to provide a comprehensive collection ...

while hearing loss has been considered to be a very heterogeneous disorder, mutations in gap junction beta 2 (gjb2) gene encoding connexin 26 (cx26) protein are the major cause of autosomal recessive and sporadic non-syndromic deafness in many populations. in this study, we have investigated the prevalence of the gjb2 gene mutations using nested pcr pre screening strategy and direct sequencing ...

Childhood deafness is quite bothersome and a common problem. EBM documents that serious hearing impairment is found in one in 800 newborns. Amongst the 50 percent of permanent childhood deafness, 30 percent is syndromic and is thought to be because of abnormal genetic makeup. Syndromic cases of deafness are more accurately diagnosed by the associated additional features of the syndrome. Waarden...

I read with interest the recent article by Yelverton and colleagues that profiles a large group of patients with hearing loss and mitochondrial mutations. The authors should be commended for the size and scope of this study; however, I feel that the study’s limitations may lead to misconceptions among some readers about this interesting and important patient group. The authors note some limitat...

Clinical characteristics. Hereditary hearing loss and deafness may be conductive, sensorineural, or a combination of both; syndromic (associated with malformations of the external ear or other organs or with medical problems involving other organ systems) or nonsyndromic (no associated visible abnormalities of the external ear or any related medical problems); and prelingual (before language de...

Mutations in the COCH (coagulation factor C homology) gene have been attributed to DFNA9 (deafness, autosomal-dominant 9), an autosomal-dominant non-syndromic hearing loss disorder. However, the mechanisms responsible for DFNA9 hearing loss remain unknown. Here, we demonstrate that mutant cochlin, the protein product of the COCH gene, forms a stable dimer that is sensitive to reducing agent. In...