A total of 144 genomic leukocyte DNA samples, derived from 31 families with
p.Tyr179Cys, 29 with p.Gly396Asp and 20 with both mutations, were
genotyped. One to 11 relatives were genotyped in 11 families segregating
p.Tyr179Cys, in five families with p.Gly396Asp and in all families segregating
both mutations. In the remaining families only the index case was available for
genotyping. All families were of European ancestry and originated from
different regions of Italy (n¼42) or Germany (n¼38).
Two hundred and eighty-eight control chromosomes, 164 from Italy and
124 from Germany, not carrying the two MUTYH recurrent mutations, were
examined to estimate allele and haplotype frequencies in the general
population. Controls included 62 unrelated individuals and 64 parents from