Presently, G protein beta 3 subunit (GNB3) (Papasavva et al., 2020), alcohol dehydrogenase 4 (ADH4) (Fourier et al., 2016), and various candidate genes like hypocretin receptor type 2 (HCRTR2) (Fourier et al., 2019; Papasavva et al., 2020) have been widely reported to be related to CH. Here, HCRTR2 is linked to cyclic hematopoiesis.