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Postaxial polydactyly type A/B (PAP-A/B) is linked to chromosome 19p13.1-13.2 in a Chinese kindred
Hongshan Zhao1, Yong Tian, Guido Breedveld
1Department of Medical Genetics, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, WHO Collaboration Center of Community Control for Inherited Diseases, Beijing, People's Republic of China.
Abstract:
Postaxial polydactyly is characterised by fifth digit duplications in hands and/or feet. Two phenotypic varieties have been described. In type A, the extra digit is well formed and articulates with the fifth or an extra metacarpal. A rudimentary extra fifth digit characterises type B. Mutations in the GLI3 gene are associated with postaxial polydactyly in some families and a second locus has been identified on chromosome 13 but the majority of cases remain unexplained. We report here a third locus for postaxial polydactyly on chromosome 19p13.1-13.2 in a large Chinese kindred with a combination of type A and B. Two-point linkage analysis showed the highest LOD score (Z(max) = 5.85 at theta; = 0 cM) at marker D19S221. Recombination events with markers D19S1165 and D19S929 define the critical region for this postaxial polydactyly locus to a region of 4.3 cM on the genetic map.