title: Genome-wide SNP genotyping identifies the Stereocilin (STRC) gene as a major contributor to pediatric bilateral sensorineural hearing impairment.
abstract: Hearing loss is the most prevalent sensory perception deficit in humans, affecting 1/500 newborns, can be syndromic or nonsyndromic and is genetically heterogeneous. Nearly 80% of inherited nonsyndromic bilateral sensorineural hearing loss (NBSNHI) is autosomal recessive. Although many causal genes have been identified, most are minor contributors, except for GJB2, which accounts for nearly 50% of all recessive cases of severe to profound congenital NBSNHI in some populations. More than 60% of children with a NBSNHI do not have an identifiable genetic cause. To identify genetic contributors, we genotyped 659 GJB2 mutation negative pediatric probands with NBSNHI and assayed for copy number variants (CNVs). After identifying 8 mild-moderate NBSNHI probands with a Chr15q15.3 deletion encompassing the Stereocilin (STRC) gene amongst this cohort, sequencing of STRC was undertaken in these probands as well as 50 probands and 14 siblings with mild-moderate NBSNHI and 40 probands with moderately severe-profound NBSNHI who were GJB2 mutation negative. The existence of a STRC pseudogene that is 99.6% homologous to the STRC coding region has made the sequencing interpretation complicated. We identified 7/50 probands in the mild-moderate cohort to have biallelic alterations in STRC, not including the 8 previously identified deletions. We also identified 2/40 probands to have biallelic alterations in the moderately severe-profound NBSNHI cohort, notably no large deletions in combination with another variant were found in this cohort. The data suggest that STRC may be a common contributor to NBSNHI among GJB2 mutation negative probands, especially in those with mild to moderate hearing impairment.
authors.affiliation: The Division of Human Genetics, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania 19104, USA.
authors.forename: Lauren J
authors.initials: LJ
authors.lastname: Francey
authors.forename: Laura K
authors.initials: LK
authors.lastname: Conlin
authors.forename: Hanna E
authors.initials: HE
authors.lastname: Kadesch
authors.forename: Dinah
authors.initials: D
authors.lastname: Clark
authors.forename: Donna
authors.initials: D
authors.lastname: Berrodin
authors.forename: Yi
authors.initials: Y
authors.lastname: Sun
authors.forename: Joe
authors.initials: J
authors.lastname: Glessner
authors.forename: Hakon
authors.initials: H
authors.lastname: Hakonarson
authors.forename: Chaim
authors.initials: C
authors.lastname: Jalas
authors.forename: Chaim
authors.initials: C
authors.lastname: Landau
authors.forename: Nancy B
authors.initials: NB
authors.lastname: Spinner
authors.forename: Margaret
authors.initials: M
authors.lastname: Kenna
authors.forename: Michal
authors.initials: M
authors.lastname: Sagi
authors.forename: Heidi L
authors.initials: HL
authors.lastname: Rehm
authors.forename: Ian D
authors.initials: ID
authors.lastname: Krantz
mesh_terms: D000072259:Connexin 26; D017630:Connexins / Q000235:genetics; D018628:Gene Dosage / Q000235:genetics; D005808:Genes, Recessive / Q000235:genetics*; D055106:Genome-Wide Association Study; D006312:Hearing Loss, Bilateral / Q000235:genetics* / Q000473:pathology*; D006579:Heterozygote; D006720:Homozygote; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins; D008565:Membrane Proteins / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide; D017421:Sequence Analysis; D017384:Sequence Deletion
chemical_list: D017630:Connexins; C000607042:GJB2 protein, human; D036341:Intercellular Signaling Peptides and Proteins; D008565:Membrane Proteins; C499079:STRC protein, human; D000072259:Connexin 26