Analysis of CHEK2 FHA domain in Czech patients with sporadic breast cancer revealed distinct rare genetic alterations.
The CHEK2 gene mutations I157T (c.470T>C) and IVS2+1G>A affecting the forkhead-associated domain (FHA) have been shown to increase the risk of breast cancer development in several populations. We analyzed the CHEK2 gene segment coding for FHA domain in 673 unselected breast cancer patients and 683 controls from the Czech Republic using the denaturant high-performance liquid chromatography. The found frequency of predominant FHA alteration I157T did not differ between breast cancer patients (19/673; 2.82%) and controls (17/683; 2.49%; P=0.71). Besides this mutation we characterized another nine alterations-six located within FHA coding sequence and three occurring in introns 1 or 2). Eight variants occurred once each in patients with breast cancer and two were present in controls. Three alterations found in breast cancer patients were novel missense variants (Y159H, T172A, and L174F) affecting highly conservative residues in FHA domain. Despite the lack of association of I157T mutation with breast cancer development in our population we deduced that the FHA domain is the subject of rare population-specific alterations that might modify risk of various cancers.
Institute of Biochemistry and Experimental Oncology, First Faculty of Medicine, Charles University in Prague, U Nemocnice 5, 128 53, Prague 2, Czech Republic. zdekleje@lf1.cuni.cz
Zdenek
Z
Kleibl
Ondrej
O
Havranek
Jan
J
Novotny
Petra
P
Kleiblova
Pavel
P
Soucek
Petr
P
Pohlreich
D001943:Breast Neoplasms / Q000235:genetics* / Q000473:pathology; D018270:Carcinoma, Ductal, Breast / Q000453:epidemiology / Q000235:genetics / Q000473:pathology; D002285:Carcinoma, Intraductal, Noninfiltrating / Q000453:epidemiology / Q000235:genetics / Q000473:pathology; D018275:Carcinoma, Lobular / Q000235:genetics / Q000473:pathology; D016022:Case-Control Studies; D064447:Checkpoint Kinase 2; D002851:Chromatography, High Pressure Liquid; D018153:Czech Republic; D005260:Female; D020022:Genetic Predisposition to Disease; D006801:Humans; D015994:Incidence; D020125:Mutation, Missense / Q000235:genetics*; D011379:Prognosis; D017346:Protein Serine-Threonine Kinases / Q000235:genetics*; D017434:Protein Structure, Tertiary
D064447:Checkpoint Kinase 2; C578634:CHEK2 protein, human; D017346:Protein Serine-Threonine Kinases