In eukaryotes, this family of proteins induces mitochondrial fission [1,2].

1: Chondrocyte protein with a poly-proline region (CHPPR) is a novel mitochondrial protein and promotes mitochondrial fission. Tonachini L, Monticone M, Puri C, Tacchetti C, Pinton P, Rizzuto R, Cancedda R, Tavella S, Castagnola P; J Cell Physiol. 2004;201:470-482. PMID:15389597

2: The nuclear genes Mtfr1 and Dufd1 regulate mitochondrial dynamic and cellular respiration. Monticone M, Panfoli I, Ravera S, Puglisi R, Jiang MM, Morello R, Candiani S, Tonachini L, Biticchi R, Fabiano A, Cancedda R, Boitani C, Castagnola P; J Cell Physiol. 2010;225:767-776. PMID:20568109