Spinal Muscular Atrophy, Lower Extremity-Predominant, 1, Autosomal Dominant, also known as smaled1, is related to spinal muscular atrophy, lower extremity-predominant, 2a, childhood onset, autosomal dominant and spinal muscular atrophy, lower extremity-predominant, 2b, prenatal onset, autosomal dominant, and has symptoms including waddling gait An important gene associated with Spinal Muscular Atrophy, Lower Extremity-Predominant, 1, Autosomal Dominant is DYNC1H1 (Dynein Cytoplasmic 1 Heavy Chain 1). Affiliated tissues include spinal cord and brain, and related phenotypes are global developmental delay and waddling gait