Novel missense mutations of TMPRSS3 in two consanguineous Tunisian families with non-syndromic autosomal recessive deafness.
Hum Mutat
; 18(2): 101-8, 2001 Aug.
Article
in En
| MEDLINE
| ID: mdl-11462234
ABSTRACT
Recently the TMPRSS3 gene, which encodes a transmembrane serine protease, was found to be responsible for two non-syndromic recessive deafness loci located on human chromosome 21q22.3, DFNB8 and DFNB10. We found evidence for linkage to the DFNB8/10 locus in two unrelated consanguineous Tunisian families segregating congenital autosomal recessive sensorineural deafness. The audiometric tests showed a loss of hearing greater than 70 dB, in all affected individuals of both families. Mutation screening of TMPRSS3 revealed two novel missense mutations, W251C and P404L, altering highly conserved amino acids of the serine protease domain. Both mutations were not found in 200 control Tunisian chromosomes. The detection of naturally-occurring TMPRSS3 missense mutations in deafness families identifies functionally important amino acids. Comparative protein modeling of the TMPRSS3 protease domain predicted that W251C might lead to a structural rearrangement affecting the active site H257 and that P404L might alter the geometry of the active site loop and therefore affect the serine protease activity.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Serine Endopeptidases
/
Mutation, Missense
/
Hearing Loss, Sensorineural
/
Membrane Proteins
/
Neoplasm Proteins
Type of study:
Prognostic_studies
Limits:
Female
/
Humans
/
Male
Country/Region as subject:
Africa
Language:
En
Journal:
Hum Mutat
Journal subject:
GENETICA MEDICA
Year:
2001
Document type:
Article
Affiliation country:
Tunisia