Mapping
In a consanguineous Pakistani family segregating autosomal recessive leukonychia, Kiuru et al. (2011) performed genomewide autozygosity mapping and identified a region of excess homozygosity shared among affected individuals on chromosome 3p22-p21.3 with a lod score of 5.1. Microsatellite markers spanning the region of autozygosity were analyzed in 3 more Pakistani families with leukonychia, 1 consanguineous and 2 consistent with dominant inheritance, and all 3 showed linkage to the same location. Key recombination events narrowed the interval to 2.0 Mb flanked by markers D3S1483 and D3S1260.