" /> Polydactyly, postaxial, type a1 - CISMeF





Preferred Label : Polydactyly, postaxial, type a1;

Symbol : PAPA1;

CISMeF acronym : PAPA; PAPA1; PAPB;

Type : Phenotype, molecular basis known;

Alternative titles and symbols : Postaxial polydactyly, type a; Polydactyly, postaxial; PAPA;

Included titles and symbols : Postaxial polydactyly, type b; PAPB;

Description : Polydactyly refers to the occurrence of supernumerary digits and is the most frequent of congenital hand and foot deformities. Based on the location of the extra digits, polydactyly can be classified into preaxial, involving the thumb or great toe; postaxial, affecting the fifth digit; and central, involving the 3 central digits. Postaxial polydactyly (PAP) is further subclassified into 2 types: in type A, a well-formed extra digit articulates with the fifth or a sixth metacarpal, whereas in type B, a rudimentary, poorly developed extra digit is present (summary by Umm-e-Kalsoom et al., 2012). - Genetic Heterogeneity of Postaxial Polydactyly Other loci for autosomal dominant postaxial polydactyly type A include;

Inheritance : Autosomal dominant;

Molecular basis : Caused by mutation in the GLI-Kruppel family member GLI3 gene (GLI3, 165240.0004);

Prefixed ID : #174200;

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28/04/2025


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