Polymorphisms in Double Strand Break Repair Related Genes Influence Radiosensitivity Phenotype in Lymphocytes from Healthy Individuals

Mumbrekar, Kamalesh Dattaram and Goutham, Hassan Venkatesh and Rao, Satish BS (2016) Polymorphisms in Double Strand Break Repair Related Genes Influence Radiosensitivity Phenotype in Lymphocytes from Healthy Individuals. DNA Repair, 40. pp. 27-34.

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Abstract

Background: A range of individual radiosensitivity observed in humans can influence individual’s susceptibility toward cancer risk and radiotherapy outcome. Therefore, it is important to measure the variation in radiosensitivity and to identify the genetic factors influencing it.Methods: By adopting a pathway specific genotype-phenotype design, we established the variability in cellular radiosensitivity by performing -H2AX foci assay in healthy individuals. Further, we genotyped ten selected SNPs in candidate genes XRCC3 (rs861539), XRCC4 (rs1805377), XRCC5 (rs3835), XRCC6 (rs2267437), ATM (rs3218698, rs1800057), LIG4 (rs1805388), NBN (rs1805794), RAD51 (rs1801320) and PRKDC (rs7003908), and analysed their influence on observed variation in radiosensitivity.Results: The rs2267437polymorphisms inXRCC6 was associated(P = 0.0326) withincreased DSBinduction while rs1805388 in LIG4 (P = 0.0240) was associated with increased radioresistance. Further, multiple risk alleles decreased the DSB repair capacity in an additive manner. Polymorphisms in candidate DSB repair genes can act individually or in combination to the efficacy of DSB repair process, resulting in variation of cellular radiosensitivity. Conclusions: Current study suggests that -H2AX assay may fulfil the role of a rapid and sensitive biomarker that can be used for epidemiological studies to measure variations in radiosensitivity. DSB repair gene polymorphisms can impact the formation and repair of DSBs.Impact: -H2AX foci analysis as well as DSBs repair gene polymorphisms can be used to assess cellular radiosensitivity, which will be useful in population risk assessment, disease prediction, individualization of radiotherapy and also in setting the radiation protection standards.

Item Type: Article
Uncontrolled Keywords: Double strand break; DNA repair; -H2AX; Radiosensitivity; SNP
Subjects: Life Sciences > MLSC Manipal
Depositing User: KMC Library
Date Deposited: 16 May 2016 09:55
Last Modified: 16 May 2016 09:55
URI: http://eprints.manipal.edu/id/eprint/146064

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