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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Epithelial membrane protein-2 and epithelial membrane protein-3: two novel members of the peripheral myelin protein 22 gene family.

Peripheral myelin protein 22 (PMP22) is expressed by Schwann cells in the peripheral nervous system (PNS), and mutations affecting the PMP22 gene are associated with hereditary motor and sensory neuropathies. We have previously defined the PMP22/ EMP/MP20 gene family by characterizing the PMP22-related epithelial membrane protein-1 (EMP-1). We now report the identification of two additional members of the same family, epithelial membrane protein-2 and epithelial membrane protein-3 (EMP-2 and EMP-3). Both cDNA-predicted polypeptides share approx. 40% aa identity with PMP22. In human, EMP-2 and EMP-3 mRNA transcripts are found in most tissues with an expression pattern partially overlapping that of PMP22 and EMP-1. EMP-2 is most prominently expressed in the adult ovary, heart, lung and intestine and in fetal lung. The levels of EMP-3 transcripts are highest in peripheral blood leukocytes, ovary, intestine and various embryonic tissues. In contrast to PMP22 and EMP-1, EMP-2 and EMP-3 expression is detectable in the liver. In vitro transcription-translation generates EMP-2 and EMP-3 polypeptides of 18 kDa which is in agreement with their predicted sizes. Since PMP22 has been implicated in the regulation of cell proliferation and apoptosis, it appears likely that these novel members of the PMP22/ EMP/MP20 protein family are also involved in similar regulatory processes in a variety of tissues.[1]


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