Abstract
The FAM69 family of cysteine-rich type II transmembrane proteins comprises three members in all vertebrates except fish, and orthologues with a conserved structure are present throughout metazoa. All three murine FAM69 proteins (FAM69A, FAM69B, FAM69C) localise to the endoplasmic reticulum (ER) in cultured cells, probably via N-terminal di-arginine motifs. Mammalian FAM69A is ubiquitously expressed, FAM69B is strongly expressed in the brain and in peripheral endothelial cells, and FAM69C in the brain and eye. Antibodies against mouse FAM69B strongly stain the ER of a subset of neurons in the brain. FAM69 proteins are likely to play a fundamental and highly conserved role in the ER of most metazoan cells, with additional specialised roles in the vertebrate nervous system.
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