Spinal Muscular Atrophy, Type Iv, also known as sma4, is related to spinal muscular atrophy and motor neuron disease, and has symptoms including tremor of hands An important gene associated with Spinal Muscular Atrophy, Type Iv is SMN1 (Survival Of Motor Neuron 1, Telomeric), and among its related pathways/superpathways is Autophagy pathway. Affiliated tissues include spinal cord and brain, and related phenotypes are rimmed vacuoles and type 1 muscle fiber predominance