MTNR1B codes for a transmembrane receptor of melatonin, and its mutations have been associated with wide‐ranging health effects including type 2 diabetes (Zhu et al., 2023) and sleep and neuropsychiatric disorders (Comai & Gobbi, 2014), conditions that are also more frequent among offspring of older mothers (Zhang et al., 2022). The gene discussed is NRP1; the disease is type 2 diabetes mellitus.