PDIK1L (PDLIM1 interacting kinase 1 like) is a serine/threonine protein kinase of 341 amino acids encoded on chromosome 1.3 1. The gene is widely expressed across human tissues including liver, kidney, pancreas, and prostate, with the protein localizing to the nucleus 1. PDIK1L functions as a catalytic kinase within a phosphatase-kinase signaling complex, working redundantly with its paralog STK35 downstream of the phosphatase SCP4 to regulate amino acid biosynthesis and transport 2. This complex maintains proliferation in acute myeloid leukemia (AML) cells through dual phospho-catalytic mechanisms, where SCP4 removes inhibitory phosphorylation and stabilizes PDIK1L kinase activity 2. Gene ontology annotations indicate PDIK1L participates in negative regulation of G2/M transition of mitotic and meiotic cell cycles 2. Clinically, PDIK1L has emerged as a diagnostic biomarker for endometriosis: serum anti-PDIK1L autoantibodies show superior diagnostic sensitivity (59.4%) and accuracy (72.8%) compared to CA-125 for detecting endometriosis, particularly in early-stage disease 3. Recent bioinformatics studies identified PDIK1L as a hub gene in oocyte aging pathology 4, suggesting roles in reproductive aging mechanisms.