A locus in 2p13-p14 (OFC2), in addition to that mapped in 6p23, is involved in nonsyndromic familial orofacial cleft malformation

Genomics
Furio PezzettiM Tognon

Abstract

An allelic association between the transforming growth factor alpha gene (TGFA) situated in the chromosome 2p13 region and nonsyndromic cleft lip with or without cleft palate, also named orofacial cleft (OFC), was found in several population studies. However, no linkage between gene and malformation has shown up until now, probably due to the presence of genetic heterogeneity and the small sample size analyzed. Previously, we employed a collection of 38 OFC families to demonstrate linkage to the 6p23 chromosome region with the presence of genetic heterogeneity. In the present study we tested whether, in the same sample, linkage between OFC and markers on 2p13 could be determined. Evidence for genetic heterogeneity in our family set was apparent, by both pairwise and multipoint linkage analyses. Moreover, lod scores > 3 were found for marker D2S378 when families linked to the 6p23 markers were analyzed. Taken together these results indicate a role for the TGFA, or for another gene physically close to it, and suggest an interaction between two different genes, OFC1 and OFC2, mapped in 6p23 and 2p13, respectively, in the development of the cleft.

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Related Concepts

Chromosomes, Human, Pair 2
Chromosomes, Human, Pair 6
Cleft Lip
Cleft Palate, Isolated
Genetic Markers
Lod Score
Genealogical Tree
Variation (Genetics)
Linkage Disequilibrium
Transforming Growth Factor alpha

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