Haplotype comparison in fresh mutation cases of adenomatous polyposis coli due to deletion AAAGA at codon 1309.

To determine whether the common 5 base pair deletion (delta AAAGA) at codon 1309 of the APC gene occurs preferentially on a particular haplotype background, three intragenic polymorphisms were typed using the polymerase chain reaction in ten patients with this deletion as the disease-causing mutation. Each case was due to fresh mutation. The data obtained provide no evidence in support of a preferential haplotype predisposing to this mutation.