Distal Hereditary Motor Neuronopathy Type 1, also known as autosomal dominant distal juvenile spinal muscular atrophy type 1, is related to neuronopathy, distal hereditary motor, autosomal dominant 1 and charcot-marie-tooth hereditary neuropathy. An important gene associated with Distal Hereditary Motor Neuronopathy Type 1 is IGHMBP2 (Immunoglobulin Mu DNA Binding Protein 2). Related phenotypes are upper limb muscle weakness and hypertonia