Genetic epidemiology of vitiligo: a study of 815 probands and their families from south China.

BACKGROUND

Genetic factors are thought to be involved in the development of vitiligo.

AIM

To explore the possible genetic model of vitiligo by analyzing the genetic characteristics of 815 patients and their families from south China (Zhejiang Province).

METHODS

Data for 815 patients with vitiligo were obtained by questionnaire. The inheritance pattern estimation, heritability calculation, and complex segregation analysis were performed using the Penrose method, Falconer regression method, and SAGE-REGTL program, respectively.

RESULTS

In 815 vitiligo probands, 128 (15.7%) had a family history. The ratio of the sibling prevalence rate to the population prevalence rate (s/q) approached 1/square root q using the Penrose calculation, and the heritability degrees of vitiligo in the first- and second-degree relatives were 59.6% and 55.2%, respectively. The complex segregation analysis suggested that the dominant model was the best-fit genetic model for vitiligo.

CONCLUSIONS

Genetic factors play an important role in the occurrence of vitiligo, and the genetic model of vitiligo in this population is consistent with a polygenetic or multifactorial inheritance in a dominant major gene pattern.