Alternatively-Spliced p53 mRNAin the FAA-HTC1Rat Hepatoma Cell Line without the Splice Site Mutations

Abstract

A novel mutation of the p53 gene has been found in a rat hepatoma cell line, FAA-HTC1.This cell line carried two kinds of abnormal p53 transcripts; one lacked the exon 8 sequence, and the other had a single base substitution G to T which resulted in a new stop codon in exon 8. In the genomic DNA, this base substitution in exon 8 was present, indicating that both transcripts were transcribed from the mutated gene. No mutation was detected in its two flanking introns. In this cell line, the exon-deleted transcript seems to be generated by exon skipping due to an unknownmechanismother than splice site mutations.