What role does CLOCK play in Allergie?

CLOCK genes are core components of the circadian clock, regulating not only sleep-wake cycles but also immune functions and inflammatory pathways. In allergies, time-of-day variations in immune responses are well documented: mast cell degranulation, histamine release, and airway reactivity follow a circadian pattern. Disruption of the clock (e.g., via shift work or jet lag) can exacerbate allergic symptoms such as nocturnal asthma. However, direct genetic associations between specific CLOCK variants and allergic diseases remain inconclusive in human studies. Most evidence comes from mechanistic and animal models. Consumer DNA tests that report CLOCK variants often overstate their predictive value for allergies. A robust allergy assessment still requires clinical history, skin prick tests, and specific IgE measurements, not genetic testing alone.