KTI12 (chr1-associated homolog) is a regulatory protein involved in tRNA modification and Elongator complex function. Primary Function: KTI12 serves as an essential regulatory factor of the Elongator complex, which catalyzes the modification of uridine bases in eukaryotic tRNAs 1. Mechanism: Rather than functioning as a structural Elongator subunit, KTI12 regulates Elongator through transient physical interactions, likely mediated by a conserved P-loop motif capable of ATP/GTP binding 2. Co-immunoprecipitation and proximity labeling studies confirm Elongator as KTI12's primary interaction partner, with additional links to proteins involved in vesicular transport, RNA metabolism, and deubiquitination 1. Disease Relevance: KTI12 has emerged as a candidate gene in type 2 diabetes susceptibility, identified through positional cloning in a mouse model displaying severe hyperglycemia and β-cell loss 3. The gene shows differential expression in pancreatic islets and sequence variation between disease-susceptible and resistant populations 3. Clinical Significance: Understanding KTI12's regulatory networks controlling Elongator activity may have implications for metabolic disease, though the exact mechanisms linking tRNA modification defects to β-cell dysfunction require further investigation.