This family includes proteins FAM151A and FAM151B, the mammalian homologues of C. elegans menorin which is involved in generation of neurons and regulation of dendrite extension [1,2]. FAM151B has been shown to be essential for retinal function [1]. Sequence analysis and the fact that these proteins have a TIM-barrel fold similar to that in phospholipase D and glycerophosphodiester phosphodiesterase (GDPD) families, indicate that they belong to PLC-like phosphodiesterase superfamily, although their substrates and function remain unknown.

1: Fam151b, the mouse homologue of C.elegans menorin gene, is essential for retinal function. Findlay AS, McKie L, Keighren M, Clementson-Mobbs S, Sanchez-Pulido L, Wells S, Cross SH, Jackson IJ; Sci Rep. 2020;10:437. PMID:31949211

2: The CATP-8/P5A-type ATPase functions in multiple pathways during neuronal patterning. Tang LTH, Trivedi M, Freund J, Salazar CJ, Rahman M, Ramirez-Suarez NJ, Lee G, Wang Y, Grant BD, Bulow HE; PLoS Genet. 2021;17:e1009475. PMID:34197450