LCORL (ligand-dependent nuclear receptor corepressor like) is a vertebrate-specific transcriptional regulator that functions as a component of polycomb repressive complex 2 (PRC2) activity balance. As PALI2 (PRC2 associated LCOR isoform 2), LCORL promotes histone H3K27 trimethylation and works antagonistically with AEBP2 to define distinct PRC2.1 and PRC2.2 subtypes essential for appropriate polycomb target gene regulation during development 1. LCORL physically interacts with the chr4 remodeling factor CHD4 and cooperates to suppress Notch signaling pathway genes 2. Functionally, LCORL is a critical metabolic regulator controlling body size and glucose homeostasis. Lcorl knockout mice exhibit reduced postnatal growth, sustained leanness, decreased food intake, and improved glucose tolerance and insulin sensitivity, mechanisms linked to reduced circulating IGF-1 and altered hepatic GH signaling 3. GWAS consistently identifies LCORL as a major locus for body size across humans and livestock species, with multiple studies in cattle, horses, goats, and dogs confirming its role in stature determination 456. Notably, LCORL variants show allelic heterogeneity, with frameshift mutations in large dog breeds and intronic substitutions in small breeds 6. Clinically, LCORL variants associate with shared genetic risk across neurodegenerative disorders; specific variants increase Alzheimer's disease and Parkinson's disease risk while decreasing risk for amyotrophic lateral sclerosis 7. Additionally, a chromosome 4.31 variant near LCORL associates with familial squamous cell lung carcinoma risk 8.