Domain disruption and mutation of the bZIP transcription factor, MAF, associated with cataract, ocular anterior segment dysgenesis and coloboma

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Serval ID
serval:BIB_60B28696C3F6
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Domain disruption and mutation of the bZIP transcription factor, MAF, associated with cataract, ocular anterior segment dysgenesis and coloboma
Journal
Human Molecular Genetics
Author(s)
Jamieson  R. V., Perveen  R., Kerr  B., Carette  M., Yardley  J., Heon  E., Wirth  M. G., van Heyningen  V., Donnai  D., Munier  F., Black  G. C.
ISSN
0964-6906 (Print)
Publication state
Published
Issued date
01/2002
Volume
11
Number
1
Pages
33-42
Notes
Journal Article
Research Support, Non-U.S. Gov't --- Old month value: Jan 1
Abstract
Human congenital cataract and ocular anterior segment dysgenesis both demonstrate extensive genetic and phenotypic heterogeneity. We identified a family where ocular developmental abnormalities (cataract, anterior segment dysgenesis and microphthalmia) co-segregated with a translocation, t(5;16)(p15.3;q23.2), in both balanced and unbalanced forms. We hypothesized that this altered the expression of a gene of developmental significance in the human lens and ocular anterior segment. Cloning the 16q23.2 breakpoint demonstrated that it transected the genomic-control domain of MAF, a basic region leucine zipper (bZIP) transcription factor, first identified as an oncogene, which is expressed in vertebrate lens development and regulates the expression of the eye lens crystallins. The homozygous null mutant Maf mouse embryo demonstrates defective lens formation and microphthalmia. Through mutation screening of a panel of patients with hereditary congenital cataract we identified a mutation in MAF in a three-generation family with cataract, microcornea and iris coloboma. The mutation results in the substitution of an evolutionarily highly conserved arginine with a proline at residue 288 (R288P) in the basic region of the DNA-binding domain of MAF. Our findings further implicate MAF/Maf in mammalian lens development and highlight the role of the lens in anterior segment development. The 16q23.2 breakpoint transects the common fragile site, FRA16D, providing a molecular demonstration of a germline break in a common fragile site.
Keywords
Amino Acid Sequence Anterior Eye Segment/*abnormalities/embryology Base Sequence Basic-Leucine Zipper Transcription Factors Cataract/congenital/*genetics Chromosomes, Human, Pair 16/genetics Coloboma/*genetics DNA/chemistry/genetics DNA Mutational Analysis DNA-Binding Proteins/*genetics Female G-Box Binding Factors Humans Karyotyping Lens, Crystalline/growth & development/metabolism/pathology Leucine Zippers/*genetics Male Molecular Sequence Data *Mutation Pedigree Proto-Oncogene Proteins/*genetics Proto-Oncogene Proteins c-maf Sequence Homology, Amino Acid Transcription Factors/*genetics
Pubmed
Web of science
Open Access
Yes
Create date
28/01/2008 12:54
Last modification date
25/09/2019 6:09
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