A new locus for congenital cataract, microcornea, microphthalmia, and atypical iris coloboma maps to chromosome 2.

Détails

ID Serval
serval:BIB_D184F2ED58EE
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
A new locus for congenital cataract, microcornea, microphthalmia, and atypical iris coloboma maps to chromosome 2.
Périodique
Ophthalmology
Auteur(s)
Abouzeid H., Meire F.M., Osman I., ElShakankiri N., Bolay S., Munier F.L., Schorderet D.F.
ISSN
1549-4713
Statut éditorial
Publié
Date de publication
01/2009
Peer-reviewed
Oui
Volume
116
Numéro
1
Pages
154-162.e1
Langue
anglais
Résumé
OBJECTIVE: To report a novel phenotype of autosomal dominant atypical congenital cataract associated with variable expression of microcornea, microphthalmia, and iris coloboma linked to chromosome 2. Molecular analysis of this phenotype may improve our understanding of anterior segment development. DESIGN: Observational case study, genome linkage analysis, and gene mutation screening. PARTICIPANTS: Three families, 1 Egyptian and 2 Belgians, with a total of 31 affected were studied. METHODS: Twenty-one affected subjects and 9 first-degree relatives underwent complete ophthalmic examination. In the Egyptian family, exclusion of PAX6, CRYAA, and MAF genes was demonstrated by haplotype analysis using microsatellite markers on chromosomes 11, 16, and 21. Genome-wide linkage analysis was then performed using 385 microsatellite markers on this family. In the 2 Belgian families, the PAX6 gene was screened for mutations by direct sequencing of all exons. MAIN OUTCOME MEASURES: Phenotype description, genome-wide linkage of the phenotype, linkage to the PAX6, CRYAA, and MAF genes, and mutation detection in the PAX6 gene. RESULTS: Affected members of the 3 families had bilateral congenital cataracts inherited in an autosomal dominant pattern. A novel form of hexagonal nuclear cataract with cortical riders was expressed. Among affected subjects with available data, 95% had microcornea, 39% had microphthalmia, and 38% had iris coloboma. Seventy-five percent of the colobomata were atypical, showing a nasal superior location in 56%. A positive lod score of 4.86 was obtained at theta = 0 for D2S2309 on chromosome 2, a 4.9-Mb common haplotype flanked by D2S2309 and D2S2358 was obtained in the Egyptian family, and linkage to the PAX6, CRYAA, or MAF gene was excluded. In the 2 Belgian families, sequencing of the junctions and all coding exons of PAX6 did not reveal any molecular change. CONCLUSIONS: We describe a novel phenotype that includes the combination of a novel form of congenital hexagonal cataract, with variably expressed microcornea, microphthalmia, and atypical iris coloboma, not caused by PAX6 and mapping to chromosome 2. FINANCIAL DISCLOSURE(S): The authors have no proprietary or commercial interest in any materials discussed in this article.
Mots-clé
Adolescent, Adult, Cataract, Child, Child, Preschool, Chromosome Mapping, Chromosomes, Human, Pair 2, Coloboma, Cornea, Crystallins, DNA Mutational Analysis, Eye Proteins, Female, Haplotypes, Homeodomain Proteins, Humans, Iris, Linkage (Genetics), Lod Score, MafF Transcription Factor, Male, Microphthalmos, Microsatellite Repeats, Middle Aged, Nuclear Proteins, Paired Box Transcription Factors, Pedigree, Repressor Proteins
Pubmed
Web of science
Création de la notice
20/02/2009 12:53
Dernière modification de la notice
20/08/2019 16:51
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