Second family with hearing impairment linked to 19q13 and refined DFNA4 localisation

Author: Farhad Mirghomizadeh, Bettina Bardtke, Marcella Devoto, Markus Pfister, Jens Oeken, Elke Konig, Emilia Vitale, Antonio Riccio, Assunta De Rienzo, Hans Peter Zenner and Nikolaus Blin
Submitted: Tuesday 28th of July 2009 12:34:29 PM
Submitted by: pgmvanoverveld
Language: English
Content type: Learning resource
Educational levels: expert, qc2, qc3

Abstract

Until now, over 30 loci have been identified by linkage analysis of affected families that segregate nonsyndromic and dominantly inherited forms of hearing impairment (DFNA). A German family with a nonsyndromic progressive hearing impairment transmitted in autosomal dominant mode was linked to 19q13.3q13.4 by a genome-wide scan. Due to the low lod-score (1.85 at y=0.05) for APOC2-locus we extended the fine mapping attempt with further markers in the same chromosomal region. This resulted in significant evidence for linkage to the markers D19S246 and D19S553 (two-point lod-score of 4.05 and 3.55 at y=0.0) and a candidate critical region of 14 cM between markers D19S412 and D19S571. This region shows partial overlap with the previously reported DFNA4 critical region. The human gene BAX is orthologous to the rodent Bcl2related apoptosis gene that is temporally expressed during the postnatal period in the developing inner ear of the mouse. BAX, mapping at a distance of no more than 0.73 cM distally to marker D19S553 appeared a likely candidate in our pedigree but genomic sequencing of coding regions and exon/intron boundaries excluded disease-related mutations. However, additional ESTs in the same region remain to be tested.

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Farhad Mirghomizadeh, Bettina Bardtke, Marcella Devoto, Markus Pfister, Jens Oeken, Elke Konig, Emilia Vitale, Antonio Riccio, Assunta De Rienzo, Hans Peter Zenner and Nikolaus Blin. Second family with hearing impairment linked to 19q13 and refined DFNA4 localisation. EUROGENE portal. July 2009. online: http://eurogene.open.ac.uk/content/second-family-hearing-impairment-linked-19q13-and-refined-dfna4-localisation

UMLS keywords

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