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. 1999 Oct;90(10):1088–1095. doi: 10.1111/j.1349-7006.1999.tb00682.x

Characterization of the MEN1 Gene Product, Menin, by Site‐specific Polyclonal Antibodies

Yasuto Ikeo 1, Akihiro Sakurai 1,✉, Kiyoshi Hashizume 1
PMCID: PMC5925994  PMID: 10595737

Abstract

The gene associated with multiple endocrine neoplasia type 1 (MEN 1), designated MEN1, has recently been identified. This gene shows no homology to other known genes, and its expression is not restricted to endocrine organs as estimated by northern blotting. Expression of the MEN1 gene product, menin, has been studied only in a few tissues. In this report, expression of menin in various cells and mouse tissues was studied using two polyclonal antibodies against menin. Expression of menin as a 76 kDa single protein was observed in all cell lines examined, regardless of origin. Two nuclear localization signals of the menin have been reported, but through the study of mutant menin in lymphocytes from subjects with MEN 1, impaired nuclear localization of the mutant menin was observed even though the mutant retained one of the two nuclear localization signals (NLSs). Menin was stable in vitro with a half‐life of over 24 h at 37°C. In the cell, the half‐life of wild‐type menin was about 10 h, while that of the mutant was about 2 h. The mutant rapidly disappeared from the nucleus.

Keywords: Multiple endocrine neoplasia type 1, Menin, Antibody, Western blotting, Nuclear localization

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