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Novel allele of the hMLH1 gene bearing a TTC deletion in the 3' untranslated region

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SSCP analysis of the hMLH1 gene in two kindreds affected by hereditary nonpolyposis colorectal cancer (HNPCC) revealed the presence of unique conformers in all patients affected by colorectal cancer. Sequence analysis of the corresponding region of the gene revealed a 3 base pairs deletion within a TTC tandem repeat (G TTC TCC T-->G TTC T) beginning 29 base pairs downstream of the termination codon of the gene in the 3' untranslated region. This deletion causes the loss of an MboII restriction site. Analysis extended to 113 healthy unrelated individuals and 27 unrelated HNPCC patients demonstrated the occurrence of this novel variant of the hMLH1 gene at similar frequencies in unrelated HNPCC patients (3.7%) and in control individuals (2.2%). The allele bearing the TTC deletion appears to be expressed at levels comparable to those of the wild-type allele.
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Document Type: Research Article


Publication date: October 1, 1996

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  • The International Journal of Oncology provides an international forum for the publication of the latest, cutting-edge research in the broad area of oncology and cancer treatment. The journal accepts original high quality works and reviews on all aspects of oncology research including carcinogenesis, metastasis, epidemiology, chemotherapy and viral oncology. Through fair and efficient peer review, the journal is dedicated to publishing top tier research in the field, offering authors rapid publication as well as high standards of copy-editing and production. The International Journal of Oncology is published on a monthly basis in both print and early online.
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