DRC7 and male infertility: In terms of male infertility, the best studied gene among the N-DRC is DRC7 (MIM: 618769), which is amenable for proper assembly of the N-DRC structure (in Drc7−/− male mice, the length of the sperm tail was reduced, followed by abnormalities of sperm head morphology) (Morohoshi et al., 2020).