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SR (serine-arginine) proteins are essential pre-mRNA splicing factors. Several SR proteins have been characterized in humans, among them SR-A1. It has been demonstrated by members of our group that the SR-A1 gene is constitutively expressed in most of the human tissues, while its transcription is increased in breast carcinoma cell lines. Moreover, the SR-A1 gene is overexpressed in a set of ovarian tumors, suggesting that it may be involved in the pathogenesis and/or progression of ovarian cancer. Therefore, in the present study we examined the expression of the SR-A1 gene in colon cancer tissues by RT-PCR and found that it is overexpressed as compared to normal mucosa ( p =0.01). The SR-A1 gene was expressed more frequently in well-differentiated tumors than those with poor differentiation. Survival curves determined by the Kaplan-Meier method and univariate analysis demonstrated that SR-A1-positivity is associated with a long survival ( p =0.044). However, when entered into a Cox multivariate model adjusted for other clinicopathological features studied, SR-A1 expression status was not found to be of independent prognostic significance. To the best of our knowledge, this is the first study examining the expression of the novel gene SR-A1 in colon cancer progression.

SR-A1, a member of the human pre-mRNA splicing factor family, and its expression in colon cancer progression