Predicted to enable mannosyltransferase activity. Acts upstream of or within several processes, including lung development; muscle cell development; and post-embryonic development. Predicted to be located in endoplasmic reticulum. Is expressed in several structures, including alimentary system; central nervous system; genitourinary system; respiratory system; and trunk mesenchyme. Human ortholog(s) of this gene implicated in lissencephaly 8. Orthologous to human TMTC3 (transmembrane O-mannosyltransferase targeting cadherins 3). [provided by Alliance of Genome Resources, Apr 2022]