R. Klaes et al., Significant increase of a specific variant TSG101 transcript during the progression of cervical neoplasia, EUR J CANC, 35(5), 1999, pp. 733-737
The human tumour susceptibility gene TSG101 has recently been identified on
chromosomal locus 11p15.1-15.2 which is frequently affected by genetic alt
erations in neoplastic lesions of the uterine cervix. Aberrant transcripts
of the TSG101 gene have been reported in various tumour entities, including
breast, ovarian and prostate cancers, but also in several non-neoplastic t
issues. We analysed TSG101 transcription by reverse transcription-polymeras
e chain reaction (RT-PCR) in a total of 139 clinical samples of cervical ti
ssues and in cervical carcinoma cell lines. Variant transcripts were observ
ed in all cell lines, in 69 of 122 (57%) cervical dysplasia and carcinoma s
amples and in five of 17 (29%) normal cervical tissues. One specific varian
t TSG101 transcript (Delta 154-1054) was detected with a significantly incr
eased frequency in advanced preneoplastic cervical lesions. However, the re
lative abundance of variant TSG101 transcripts appeared to be generally low
, as only wild-type, but no variant transcripts were detectable in Northern
blot analyses of cervical carcinoma cell lines. These data point to a prog
ressive loss of stringent splice control functions or to extended alternati
ve splicing in advanced dysplasia and neoplasia. The relative amounts of va
riant transcripts do not support a major functional role of TSG101 variants
in cervical carcinogenesis. (C) 1999 Elsevier Science Ltd. All rights rese
rved.