Genomic rearrangements in MSH2 and MLH1 are rare mutational events in Spanish patients with hereditary nonpolyposis colorectal cancer.
Colorectal cancer (CRC) is one of the most common neoplasms and a leading cause of death related to cancer worldwide. Hereditary nonpolyposis colorectal cancer (HNPCC) is the most frequent autosomal dominant predisposition to the development of CRC, accounting for approximately 2.5% of the total CRC burden in Spain. Genomic rearrangements in the MSH2 and MLH1 genes have been reported to account for an important proportion of the mutation spectrum in HNPCC, and DNA dosage techniques have been developed facilitating molecular screening of such deletions/duplications. We screened for MSH2 and MLH1 genomic rearrangements by multiplex ligation-dependent probe amplification (MLPA) in 142 Spanish patients at risk for HNPCC prior to the exon-by-exon mutation scanning and found a deletion encompassing exons 9-16 of MSH2 and a duplication encompassing exons 11-16 of MSH2, both only in one case. These results showed that MSH2/MLH1 rearrangements in Spanish patients at risk for HNPCC seem to be a less frequent mutational event than in other populations.
Castellví-Bel
Sergi
S
Gastroenterology Department, Institut de Malalties Digestives, IDIBAPS, Barcelona, Catalonia, Spain.
Castells
Antoni
A
Strunk
Mark
M
Ferrández
Angel
A
Piazuelo
Elena
E
Milà
Montserrat
M
Piñol
Virgínia
V
Rodríguez-Moranta
Francisco
F
Andreu
Montserrat
M
Lanas
Angel
A
Piqué
Josep Maria
JM
D048868:Adaptor Proteins, Signal Transducing; D020137:Base Pair Mismatch; D002352:Carrier Proteins; D003123:Colorectal Neoplasms, Hereditary Nonpolyposis / Q000235:genetics*; D004252:DNA Mutational Analysis; D004260:DNA Repair; D045643:DNA Repair Enzymes; D004268:DNA-Binding Proteins; D015321:Gene Rearrangement; D006801:Humans; D000070957:MutL Protein Homolog 1; D051718:MutS Homolog 2 Protein; D009363:Neoplasm Proteins / Q000235:genetics*; D009687:Nuclear Proteins / Q000235:genetics*; D011518:Proto-Oncogene Proteins; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013030:Spain
D048868:Adaptor Proteins, Signal Transducing; D002352:Carrier Proteins; D004268:DNA-Binding Proteins; C501486:MLH1 protein, human; D009363:Neoplasm Proteins; D009687:Nuclear Proteins; D011518:Proto-Oncogene Proteins; C497172:MSH2 protein, human; D000070957:MutL Protein Homolog 1; D051718:MutS Homolog 2 Protein; D045643:DNA Repair Enzymes