Splice-site mutation in the PDS gene may result in intrafamilial variability for deafness in Pendred syndrome
Pendred syndrome is a recessive inherited disorder that consists of developmental abnormalities of the cochlea, sensorineural hearing loss, and diffuse thyroid enlargement (goiter). This disorder may account for up to 10% of cases of hereditary deafness. The disease gene (PDS) has been mapped to chr...
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Published in | Human mutation Vol. 14; no. 6; pp. 520 - 526 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
New York
John Wiley & Sons, Inc
01.01.1999
Hindawi Limited |
Subjects | |
Online Access | Get full text |
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Summary: | Pendred syndrome is a recessive inherited disorder that consists of developmental abnormalities of the cochlea, sensorineural hearing loss, and diffuse thyroid enlargement (goiter). This disorder may account for up to 10% of cases of hereditary deafness. The disease gene (PDS) has been mapped to chromosome 7q22‐q31, and encodes a chloride‐iodide transport protein. We performed mutation analysis of individual exons of the PDS gene in one Spanish family that shows intrafamilial variability of the deafness phenotype (two patients with profound and one with moderate–severe deafness). We identified a new splice‐site mutation affecting intron 4 of the PDS gene, at nucleotide position 639+7. RNA analysis from lymphocytes of the affected patients showed that mutation 639+7A→G generates a new donor splice site, leading to an mRNA with an insertion of six nucleotides from intron 4 of PDS. Since the newly created donor splice site is likely to compete with the normal one, variations of the levels of normal and aberrant transcripts of the PDS gene in the cochlea may explain the variability in the deafness presentation. Hum Mutat 14:520–526, 1999. © 1999 Wiley‐Liss, Inc. |
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Bibliography: | Italian Ministry of Health ArticleID:HUMU11 Italian Telethon istex:2188DE44BC71E29F722C50C8EC6089A6C6A6DE0C European Commission - No. BMH4-CT96-1364 FISS - No. 98/9207 Servei Català de la Salut Marató de TV3 - No. 981710 Fondo de Investigaciones Sanitarias - No. 99/0917 ark:/67375/WNG-MM5922S7-J ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1059-7794 1098-1004 |
DOI: | 10.1002/(SICI)1098-1004(199912)14:6<520::AID-HUMU11>3.0.CO;2-K |