Waardenburg Syndrome (WS) Type I is Caused by Defects at Multiple Loci, One of Which is Near ALPP on Chromosome 2: First Report of the WS Consortium

Overview

Journal Am J Hum Genet

Publisher Cell Press

Specialty Genetics

Date 1992 May 11

PMID 1349198

Citations 61

Authors

L A Farrer

K M Grundfast

J Amos

K S Arnos

J H Asher Jr

P Beighton

S R Diehl

J Fex

C Foy

T B Friedman

Affiliations

Soon will be listed here.

Abstract

Previous studies have localized the gene for Waardenburg syndrome (WS) type I to the distal portion of chromosome 2q, near the ALPP locus. We pooled linkage data obtained from 41 WS type I and 3 WS type II families which were typed for six polymorphic loci on chromosome 2q in order to refine the location of the WS locus (WS1) and evaluate the extent of genetic heterogeneity. In the course of this work, we developed diagnostic criteria for genetic and phenotypic studies. Our findings, based on two-locus and multilocus analysis using a linkage map established from reference pedigrees, suggest that there are two or more mutations causing WS, one of which (i.e., WS1) is located on chromosome 2q, between the ALPP and FN1 loci, at distances of 7.8 cM and 11.2 cM for each marker, respectively. The results also indicate that WS1 is responsible for the illness in approximately 45% of all families in this sample. However, the odds favoring this position over a location between ALPP and SAG are only 2:1 when alternate assumptions about the proportion of linked families are considered. We conclude that a more saturated map of this region of chromosome 2q, including highly polymorphic markers, will be needed to accurately distinguish linked families and, ultimately, isolate the mutant gene.

Citing Articles

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