A Chinese male infant with arthrogryposis multiplex congenita (AMC), ventricular and atrial septal defects, and Werdnig-Hoffmann disease (WHD) had deletions of the telomeric copy of the survival motor neuron (SMN(T)) and neuronal apoptosis inhibitory protein genes.
Seven index patients being not deleted for the SMN gene who belonged to a well-defined SMA plus variant that has already been shown to be unlinked with chromosome 5q markers: diaphragmatic SMA, SMA plus olivopontocerebellar hypoplasia, SMA with congenital arthrogryposis and bone fractures.2.