NDLI: Construction of heteroduplex DNA andin vitro model for functional analysis of mismatch repair

Content Provider	Springer Nature Link
Author	Wang, Yi Clark, Alan Wang, Jiaxun Sun, Menghong Shi, Daren
Copyright Year	2004
Abstract	Functional deficiency of mismatch repair (MMR) system is one of the mechanisms of tumorigenesis. With the development of the investigation and the requirement from the clinical diagnosis and treatment it is necessary to build up a method to evaluate the functional status of the whole MMR system in the concerned tumors. The original ssDNA and dsDNA from wild type (wt) bacteriophage M13mp2 and its three derivates with mutation points in thelacZα gene have been used to construct two kinds of heteroduplex DNA molecules. One named del(2) has two bases deleted in the negative strand, the other has a G·G mismatch base pair in the negative strand too. Introducing this heteroduplex DNA intoE. coli NR9162 (mutS $^{−}$) without the MMR ability on the indicator plate with x-gal and IPTG, there are three kinds of plaques, mixture plaque as the characteristic phenotype of heteroduplex DNA, blue and clear plaques. If the cell extract is mismatch repair competent the percentage of the mixture plaque will decrease after incubation with these heteroduplex DNA, the repair efficiency is expressed in percentage as 100× (1 minus the ratio of percentages of mixture plaque obtained from the extract-treated sample and untreated samples), which can imply the functional status of MMR system of certain samples. After large T-antigen-dependent SV-40 DNA replication assay cell extract from TK6, a human lymphoblastoid B-cell lymphoma cell line with MMR ability, and Lovo, a human colonic carcinoma cell line with MMR deficiency have incubated with these heteroduplex DNA. The repair efficiency of TK6 to del(2) is more than 60%, to G·G is more than 50%. The Lovo efficiency to del(2) is less than 10%, to G·G is less than 20%. Therefore, in thisin vitro model used for functional analysis of mismatch repair of heteroduplex DNA as the repair target, TK6 can serve as the control for MMR proficiency and Lovo as the control for MMR deficiency. Using this model the tumor tissue from a case of hereditary nonpolyposis colorectal cancer (microsatellite instability high, MSI-H) was measured and lack of MMR ability was shown. And a case of sporadic rectal cancer (SRC) (microsatellite stability, MSS) maintains MMR proficiency. The results indicate that the model is sensitive and dependable. It could be used to measure the function status of MMR system in tumor cell and/or tissues. This is a reliable method to investigate the mechanic of tumorigenesis. It is meaningful in the observation of the role of MMR in the initiation and progression of concerned tumors.
Starting Page	33
Ending Page	38
Page Count	6
File Format	PDF
ISSN	10016538
Journal	Chinese Science Bulletin
Volume Number	49
Issue Number	1
e-ISSN	18619541
Language	English
Publisher	Science in China Press
Publisher Date	2004-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	mismatch repair functional analysis heteroduplex DNA microsatellite instability bacteriophage neoplasms Science Life Sciences Physics Chemistry/Food Science Geosciences Engineering
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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