The function of CIAO1 (cytosolic iron-sulfur assembly component 1, ENSG00000144021) is as follows. Key component of the cytosolic iron-sulfur protein assembly (CIA) complex, a multiprotein complex that mediates the incorporation of iron-sulfur cluster into extramitochondrial Fe/S proteins (PubMed:17937914, PubMed:23891004, PubMed:38950322). As a CIA complex component, interacts specifically with CIAO2A or CIAO2B and MMS19 to assist different branches of iron-sulfur protein assembly, depending of its interactors. The complex CIAO1:CIAO2B:MMS19 binds to and facilitates the assembly of most cytosolic-nuclear Fe/S proteins. CIAO1:CIAO2A specifically matures ACO1 and stabilizes IREB2 (PubMed:23891004). Seems to specifically modulate the transactivation activity of WT1 (PubMed:9556563). As part of the mitotic spindle- associated MMXD complex it may play a role in chromosome segregation (PubMed:20797633). {ECO:0000255|HAMAP-Rule:MF_03037, ECO:0000269|PubMed:17937914, ECO:0000269|PubMed:20797633, ECO:0000269|PubMed:23891004, ECO:0000269|PubMed:38950322, ECO:0000269|PubMed:9556563}.