Hypermethylation of the 5'CpG island of the FHIT gene in clear cell renal carcinomas.

Abstract:

:FHIT is a tumour suppressor gene which is frequently inactivated in different types of cancer. Both genetic (mutations, deletions, chromosomal rearrangements) and epigenetic (aberrant methylation of the 5'CpG island) alterations of the FHIT gene have been reported in various malignancies. Yet little is known about the mechanism of FHIT inactivation in clear cell renal carcinomas. Since genetic alterations were not frequently observed in DNA corresponding to the FHIT gene in renal tumours, to elucidate the mechanism of FHIT gene silencing we examined 22 paired samples of clear cell renal carcinoma and non-malignant renal tissue for the methylation of the FHIT 5'CpG island by methylation-specific PCR. Hypermethylation of the FHIT 5'CpG island was detected in 54.5% (12/22) of clear cell renal carcinomas. Bisulfite sequencing of the FHIT 5'CpG island confirmed the results obtained by methylation-specific PCR for selected samples. We showed here that expression of the FHIT gene is inversely correlated with hypermethylation of the FHIT 5'CpG island in the selected samples. Our results suggest that hypermethylation of the FHIT 5'CpG island may be responsible for inactivation of the FHIT gene in clear cell renal carcinomas.

journal_name

Cancer Lett

journal_title

Cancer letters

authors

Kvasha S,Gordiyuk V,Kondratov A,Ugryn D,Zgonnyk YM,Rynditch AV,Vozianov AF

doi

10.1016/j.canlet.2008.02.036

subject

Has Abstract

pub_date

2008-07-08 00:00:00

pages

250-7

issue

2

eissn

0304-3835

issn

1872-7980

pii

S0304-3835(08)00131-6

journal_volume

265

pub_type

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