{Reference Type}: Journal Article {Title}: Circadian clock gene polymorphisms implicated in human pathologies. {Author}: Janoski JR;Aiello I;Lundberg CW;Finkielstein CV; {Journal}: Trends Genet {Volume}: 0 {Issue}: 0 {Year}: 2024 Jun 12 {Factor}: 11.821 {DOI}: 10.1016/j.tig.2024.05.006 {Abstract}: Circadian rhythms, ~24 h cycles of physiological and behavioral processes, can be synchronized by external signals (e.g., light) and persist even in their absence. Consequently, dysregulation of circadian rhythms adversely affects the well-being of the organism. This timekeeping system is generated and sustained by a genetically encoded endogenous mechanism composed of interlocking transcriptional/translational feedback loops that generate rhythmic expression of core clock genes. Genome-wide association studies (GWAS) and forward genetic studies show that SNPs in clock genes influence gene regulation and correlate with the risk of developing various conditions. We discuss genetic variations in core clock genes that are associated with various phenotypes, their implications for human health, and stress the need for thorough studies in this domain of circadian regulation.