“…Some of the mutations in this exon identified in our study have already been described in several other patients, giving evidence for mutation hot-spots, like the A-stretch at position c.3629-3638 (codons 1191-1194) -mutations in 25 unrelated patients described [Becker et al, 1996;Lin et al, 1993;Economou 1992;Pieneman et al, 1995;Becher et al, 1996;Freson et al, 1998;Vidal et al, 2001;Goodeve et al, 2000;Akkarapatumwong et al, 2000, present study]; c.4372-4379, codons 1439-1441 (13 mutations described) [http://europium.csc.mrc.ac.uk]; c.4820-4825, codons 1588-1590 (4 mutations described) [Lin et al, 1993;Freson et al, 1998;Goodeve et al, 2000;present study). Furthermore c.3702-3705delTACA, codon 1215-1216 identified in one of our patients has been described in two other patients [Tavassoli et al, 1998b;Ivaskevicius et al, 2001], showing that this repetitive sequence could be also prone to mutations.…”