Please use this identifier to cite or link to this item: https://doi.org/10.1002/ijc.21945
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dc.titleOverexpression of RB1 transcript is significantly correlated with 13q14 allelic imbalance in colorectal carcinomas
dc.contributor.authorLai, P.-S.
dc.contributor.authorCheah, P.Y.
dc.contributor.authorKadam, P.
dc.contributor.authorChua, C.L.-M.
dc.contributor.authorLie, D.K.H.
dc.contributor.authorLi, H.-H.
dc.contributor.authorEu, K.-W.
dc.contributor.authorSeow-Choen, F.
dc.contributor.authorLee, A.S.-G.
dc.date.accessioned2014-11-06T08:36:02Z
dc.date.available2014-11-06T08:36:02Z
dc.date.issued2006-09-01
dc.identifier.citationLai, P.-S., Cheah, P.Y., Kadam, P., Chua, C.L.-M., Lie, D.K.H., Li, H.-H., Eu, K.-W., Seow-Choen, F., Lee, A.S.-G. (2006-09-01). Overexpression of RB1 transcript is significantly correlated with 13q14 allelic imbalance in colorectal carcinomas. International Journal of Cancer 119 (5) : 1061-1066. ScholarBank@NUS Repository. https://doi.org/10.1002/ijc.21945
dc.identifier.issn00207136
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/107495
dc.description.abstractRB1 gene expression has been reported to be upregulated in colorectal carcinomas (CRC) at both the mRNA and protein levels when compared to normal colonic mucosa. However, allelic loss at the genomic level has been detected in CRC with widely differing frequencies ranging from 11.5% to 50%. To determine whether there is indeed a correlation between RB1 allelic imbalance (AI) and expression, a consecutive series of 55 CRC from Singapore patients were analysed by microsatellite analysis, real-time RT-PCR and immunohistochemistry. Microsatellite analysis using 3 RB1 intragenic microsatellite markers and 2 markers flanking RB1 detected AI in 32.7% (18/55) of the cases, in at least 1 locus. The highest AI frequency (22.9%) was observed at the microsatellite marker B13S137 (Cu13), which maps 5 cM distal to RB1. AI was present in both early and late Dukes stages. Real-time RT-PCR revealed that all 40 cases analysed expressed RB1 mRNA, with mRNA overexpression in 37.5% (15/40) and pRB protein expression in 88.2% (30/34) of cases. Notably, a statistically significant correlation was found between AI of RB1 and mRNA overexpression of RB1 (p < 0.001, Fishers exact test). These findings provide evidence that despite AI, RB1 expression is not abrogated. Thus, our data suggests that RB1 may play a role in colorectal tumorigenesis through functional regulation of the transcript and protein rather than through its tumour suppressor role by gene inactivation. © 2006 Wiley-Liss, Inc.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1002/ijc.21945
dc.sourceScopus
dc.subjectAllelic imbalance
dc.subjectColorectal cancer
dc.subjectExpression
dc.subjectRB1
dc.typeArticle
dc.contributor.departmentPAEDIATRICS
dc.description.doi10.1002/ijc.21945
dc.description.sourcetitleInternational Journal of Cancer
dc.description.volume119
dc.description.issue5
dc.description.page1061-1066
dc.description.codenIJCNA
dc.identifier.isiut000239287800012
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