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Kashuba, V.I. et al.

RBSP3 (HYA22) is a tumor suppressor gene implicated in major epithelial malignancies.

Chromosome 3p21.3 region is frequently (>90%) deleted in lung and other major human carcinomas. We subdivided 3p21.3 into LUCA and AP20 subregions and discovered frequent homozygous deletions (10-18%) in both subregions. This finding strongly implies that they harbor multiple tumor suppressor genes involved in the origin and/or development of major epithelial cancers. In this study, we performed an initial analysis of RBSP3/HYA22, a candidate tumor suppressor genes located in the AP20 region. Two sequence splice variants of RBSP3/HYA22 (A and B) were identified, and we provide evidence for their tumor suppressor function. By sequence analysis RBSP3/HYA22 belongs to a gene family of small C-terminal domain phosphatases that may control the RNA polymerase II transcription machinery. Expression of the gene was drastically (>20-fold) decreased in 11 of 12 analyzed carcinoma cell lines and in three of eight tumor biopsies. We report missense and nonsense mutations in tumors where RBSP3/HYA22 was expressed, growth suppression with regulated transgenes in culture, suppression of tumor formation in severe combined immunodeficient mice, and dephosphorylation of ppRB by RBSP3/HYA22, presumably leading to a block of the cell cycle at the G1/S boundary.[1]

References

RBSP3 (HYA22) is a tumor suppressor gene implicated in major epithelial malignancies. Kashuba, V.I., Li, J., Wang, F., Senchenko, V.N., Protopopov, A., Malyukova, A., Kutsenko, A.S., Kadyrova, E., Zabarovska, V.I., Muravenko, O.V., Zelenin, A.V., Kisselev, L.L., Kuzmin, I., Minna, J.D., Winberg, G., Ernberg, I., Braga, E., Lerman, M.I., Klein, G., Zabarovsky, E.R. Proc. Natl. Acad. Sci. U.S.A. (2004) [Pubmed]

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