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Studies on human lysine-specific demethylase 2A (KDM2A) by others have recently begun. To date, the demethylase activity has been known to reduce expression of genes and eventually inhibit proliferation of cells. However, while attempting to improve proliferation of hES-cell–derived Nod keratinocytes, which grow poorly and have a short life span, we found that high expression of the KDM2A gene improves the poor proliferation of the cells. Of the four isomer cDNAs that we prepared from alternatively spliced KDM2A transcripts, only one stimulates the proliferation. This (KDM2A-N782) encodes the 782AA protein containing the JmjC, CXXC, and Ring domains, but not the F-box and AMN1 domains, unlike KDM2A, which has been studied by other groups. Our results not only show that differently spliced transcripts from a gene result in totally opposite outcomes, but also present critical evidence of the complicated activities of KDM2A, which contains all of the five domains.

Lysine-specific demethylase 2A (KDM2A) normalizes human embryonic stem cell derived keratinocytes