Evaluation of microsatellite instability in tumors of central nervous system: A pilot study |
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| Authors: | Minal Vaish Raj Kumar R D Mittal Balraj Mittal |
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| Institution: | (1) Department of Medical Genetics, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Raebareli Road, 226014 Lucknow, India;(2) Department Neurosurgery, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Raebareli Road, 226014 Lucknow, India;(3) Department Urology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Raebareli Road, 226014 Lucknow, India |
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| Abstract: | Microsatellite instability (MSI) characterized by alterations at simple repetitive genomic sequences is a distinct mechanism in tumorogenesis. Central nervous system (CNS) tumors have been reported to exhibit MSI, indicator of defective mismatch repair system with controversies. The present study was undertaken to examine sixteen primary brain and two spinal tumors for MSI at six mono: BAT-26, BAT-40, BAX, TGFßRII, IGFIIR and hMSH3 and four dinucleotide loci: D2S123, D9S1851, D9S283 and D18S58. Polymerase chain reaction (PCR) was done to amplify tumour and blood DNA, analyzed on 8% denaturing Polyacrylamide gel followed by autoradiography. Out of 18 CNS tumors examined, 39% exhibited MSI at BAT-26, BAT-40, D9S1851, D9S283 and D18S58 in tumoral DNA. However, no alteration was observed at BAX, TGFßRII, IGFIIR, hMSH3 and D2S123 loci. Low incidence of MS1-high hypothesizes role of MSI in evolution of CNS tumors but not in cancer initiation or progression. |
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| Keywords: | Brain and spinal tumors Tumor development Mono-and dinucleotide microsatellite markers Mismatch repair |
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