Human Molecular Genetics, Vol 5, 1199-1203, Copyright © 1996 by Oxford University Press
AN Akarsu, ME Turacli, SG Aktan, M Barsoum-Homsy, L Chevrette, BS Sayli and M Sarfarazi
Primary congenital glaucoma (gene symbol: GLC3) is an ocular disorder that
occurs for 0.01-0.04% of blind people. In the majority of familial cases
reported so far, this condition is inherited as an autosomal recessive
trait. We have recently used a group of 17 GLC3 families with a minimum of
two affected offspring and consanguinity in most of the parental generation
and mapped the first GLC3 locus (GLC3A) to the 2p21 region. Six families
did not show any linkage to the GLC3A locus and thus provided evidence for
genetic heterogeneity of this disorder. A total of eight families unlinked
to the 2p21 region were used to search for the chromosomal location of the
second GLC3 locus. Herein, we describe mapping of a new locus (designated
GLC3B) for primary congenital glaucoma to the short arm of chromosome 1
(1p36.2-36.1) that is situated centromeric to the neuroblastoma and
Charcot-Marie-Tooth type 2A (CMT2A) loci. A total of 17 DNA markers were
genotyped from this region of chromosome 1. Four families showed no
recombination with the two markers D1S2834 and D1S402 with a maximum lod
score of 4.510 and 4.157 respectively. Pairwise and multipoint linkage
analysis and inspection of the haplotypes revealed that the remaining four
families are not linked to this part of chromosome 1, thus providing
further evidence that at least one more locus for the autosomal recessive
form of GLC3 must exist in the genome. Based on the recombination events,
the overall linkage map of this region is: tel-D1S1192-D1S1635-D1S1193 -
(D1S1597/-D1S489/D1S228)- [GLC3B/D1S2834/D1S402] - (D1S1176/D1S507/D1S407)
- D1S2728-(MFAP2/D1S170) - D1S1368 - D1S436- D1S1592-cen.
ARTICLES
A second locus (GLC3B) for primary congenital glaucoma (Buphthalmos) maps to the 1p36 region
Department of Surgery, University of Connecticut Health Center, Farmington, USA.
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