title: Detection of K-ras exon 1 mutations by constant denaturant capillary electrophoresis.
abstract: Among various mutation detection methods, constant denaturant capillary electrophoresis (CDCE) is one of the most common techniques for rapid identification of known or unknown mutations. In this report, a CDCE analysis method with homemade linear polyacrylamide (LPA) kit was developed on ABI 310 genetic analyzer, the effect and relationship of various denaturing factors in CDCE analysis were investigated and K-ras gene mutations of 31 coloerctal cancer patients were detected. Results indicate that, with the increase of chemical danaturant concentration, the optimum temperature was lowered, and when the concentration of urea (formamide) was higher than 7 M (40%), the homoduplex and heteroduplex of mutant samples were separated with difficulty. Detection results of K-ras gene in colorectal samples indicated that mutations were present in eight (26%) of 31 patients; most mutations were localized in codon 12, which is thought to be a critical step and plays an important role in human colorectal carcinogenesisas.
authors.affiliation: National Chromatographic R&A Center, Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian 116011, People's Republic of China.
authors.forename: Chunxia
authors.initials: C
authors.lastname: Zhao
authors.forename: Guowang
authors.initials: G
authors.lastname: Xu
authors.forename: Xianzhe
authors.initials: X
authors.lastname: Shi
authors.forename: Jianmei
authors.initials: J
authors.lastname: Ma
authors.forename: Shen
authors.initials: S
authors.lastname: Lu
authors.forename: Qing
authors.initials: Q
authors.lastname: Yang
mesh_terms: D000180:Acrylic Resins; D015179:Colorectal Neoplasms / Q000235:genetics; D004252:DNA Mutational Analysis / Q000379:methods*; D019075:Electrophoresis, Capillary / Q000379:methods*; D005091:Exons / Q000235:genetics*; D005559:Formamides; D011905:Genes, ras / Q000235:genetics*; D006801:Humans; D007202:Indicators and Reagents; D009691:Nucleic Acid Denaturation; D016133:Polymerase Chain Reaction; D000099166:Polyacrylamides
chemical_list: D000180:Acrylic Resins; D005559:Formamides; D007202:Indicators and Reagents; D000099166:Polyacrylamides; C031066:formamide