John Libbey Eurotext

European Journal of Dermatology

MENU

Congenital triangular alopecia may be categorized as a paradominant trait Volume 13, numéro 4, July 2003

Auteur
Department of Dermatology, Philipp University of Marburg, Deutschhausstraße 9, D-35033  Marburg, Germany
  • Mots-clés : congenital triangular alopecia, temporal triangular alopecia, loss of heterozygosity, mosaicism, paradominant inheritance
  • Page(s) : 346-7
  • Année de parution : 2003

The genetic basis of congenital triangular alopecia (CTA) is so far not clear. The following arguments are presented in favor of the notion that this may be a paradominant trait. CTA usually occurs sporadically but may exceptionally affect several members of a family. The lesion is usually unilateral but bilateral involvement may likewise occur. CTA has been reported in association with phacomatosis pigmentovascularis, providing evidence that it may originate from loss of heterozygosity. Heterozygous individuals would be phenotypically normal. The trait would be expressed only when postzygotic loss of the corresponding wildtype allele occurred in a early developmental stage. Future molecular research may show whether the concept of paradominant inheritance holds true.