While comparing identified homozygosity regions with previously reported loci, we came up with a 3.97 Mb region on chromosome 11 harboring the TCIRG1 gene that has been previously reported to be mutated in autosomal recessive osteopetrosis (see Additional file 1: Figure S1, Figure S2, Table S4, Table S5). Here, TCIRG1 is linked to autosomal recessive osteopetrosis.