Linkage of polymorphic congenital cataract to the gamma-crystallin gene locus on human chromosome 2q33-35.

Abstract:

:Cataract is one of the major causes of blindness in humans. We describe here an autosomal dominant polymorphic congenital cataract (PCC) which is characterised by wide variations in phenotype of non-nuclear lens opacities, even among affected members of the same family. PCC families included a large, unique pedigree (254 members, 103 affected individuals), and genetic linkage was conducted using a variety of polymorphic markers. Evidence for linkage was found for chromosome 2q33-35 with PCC mapping near D2S72 and TNP1. A tri-nucleotide microsatellite marker for gamma-crystallin B gene (CRYG1) was found to co-segregate with PCC and yielded a maximum lod score of 10.62 at (theta = 0). A multipoint analysis demonstrated that the most probable location of the PCC gene was within an 8 cM genetic interval containing the gamma-crystallin gene cluster. These data provide strong evidence of the existence of an autosomal dominant mutation for PCC in or near the gamma-crystallin gene cluster. This defect is characterised by complete penetrance but variable expression of the cataract phenotype. Our study also suggests that non-nuclear human cataracts might be caused by some abnormality in gamma-crystallin genes.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Rogaev EI,Rogaeva EA,Korovaitseva GI,Farrer LA,Petrin AN,Keryanov SA,Turaeva S,Chumakov I,St George-Hyslop P,Ginter EK

doi

10.1093/hmg/5.5.699

subject

Has Abstract

pub_date

1996-05-01 00:00:00

pages

699-703

issue

5

eissn

0964-6906

issn

1460-2083

pii

5w0349

journal_volume

5

pub_type

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