TRPM6 (Transient Receptor Potential Cation Channel Subfamily M Member 6): TRPM6 is a channel that plays a crucial role in magnesium (Mg) absorption and homeostasis. It is essential for maintaining proper magnesium balance in the body, and mutations in TRPM6 can lead to hypomagnesaemia with secondary hypocalcaemia, a condition characterised by low magnesium and calcium (Ca) levels in the blood.