MedGen

Hypomagnesemia, seizures, and impaired intellectual development-2 (HOMGSMR2) is characterized by generalized seizures in infancy, severe hypomagnesemia, and renal magnesium wasting. Seizures persist despite magnesium supplementation and are associated with significantly impaired intellectual development (Schlingmann et al., 2018). For a discussion of genetic heterogeneity of hypomagnesemia, seizures, and impaired intellectual development, see HOMGSMR1 (616418). [from OMIM]

Charcot-Marie-Tooth disease type 2DD is an autosomal dominant peripheral sensorimotor neuropathy mainly affecting the lower limbs. Affected individuals have gait impairment due to distal muscle weakness and atrophy. Some patients may also have involvement of the distal upper limbs, resulting in atrophy of the intrinsic hand muscles. The age at onset and severity of the disorder is highly variable, even within families, and those with earlier onset in late childhood or the teenage years tend to have a more severe disease course. Patients remain ambulatory even late in the disease, although some may require orthotic devices (summary by Lassuthova et al., 2018). For a phenotypic description and a discussion of genetic heterogeneity of axonal CMT type 2, see CMT2A (118210). [from OMIM]