ADRA1A (Adrenoceptor Alpha 1A): ADRA1A is a gene that encodes a subtype of alpha-1-adrenergic receptors, which are involved in the body’s responses to adrenaline and noradrenaline. These receptors play a key role in smooth muscle contraction and cardiovascular function, including blood pressure regulation and vascular tone. Changes in ADRA1A activity may influence cardiovascular health and autonomic nervous system function.