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Neurology 2003;60:983-987
© 2003 American Academy of Neurology

Classical infantile spinal muscular atrophy with SMN deficiency causes sensory neuronopathy

S. Rudnik-Schöneborn, MD, H.H. Goebel, MD, W. Schlote, MD, S. Molaian, MD, H. Omran, MD, U. Ketelsen, MD, R. Korinthenberg, MD, D. Wenzel, MD, H. Lauffer, MD, M. Kreiß-Nachtsheim, MD, B. Wirth, PhD and K. Zerres, MD

From the Institute for Human Genetics (Drs. Rudnik-Schöneborn and Zerres), University of Technology Aachen; Department of Neuropathology (Drs. Goebel and Molaian), University of Mainz; Department of Pathology (Dr. Schlote), University of Frankfurt; Department of Neuropediatrics and Muscular Diseases (Drs. Omran, Ketelsen, and Korinthenberg), University of Freiburg; Department of Neuropediatrics (Drs. Wenzel and Lauffer), Children’s Hospital, University of Erlangen; and Institute for Human Genetics (Drs. Kreiß-Nachtsheim and Wirth), University of Bonn, Germany.

Address correspondence and reprint requests to Dr. Sabine Rudnik-Schöneborn, Institut für Humangenetik, RWTH Aachen, Pauwelsstr. 30, D-52074 Aachen, Germany; e-mail: srudnik-schoeneborn{at}ukaachen.de

Objective: Classic infantile spinal muscular atrophy (SMA) is believed to be a purely motor disorder, affecting neurons of the spinal anterior horn and nuclei of the lower cranial nerves. Other organ malformations or peripheral nerve involvement have been regarded as exclusion criteria for infantile SMA. Whether SMN protein deficiency can also lead to loss of sensory neurons has not been systematically addressed.

Methods: The authors evaluated the sural nerve biopsies of 19 patients with infantile SMA of varying severity. The diagnosis of SMA was confirmed by the presence of a homozygous deletion of the SMN1 gene in all patients.

Results: In seven unrelated infants with SMA type I, axonal degeneration of the sural nerve was noted. Five patients showed abnormal sensory conduction, thus prompting sural nerve biopsy. Sural nerves showed different degrees of axonal loss: fiber density ranged from 3.482 to 22.076/mm2 and was markedly reduced in four patients. There was no evidence of primary demyelination: the ratio of total myelinated fiber thickness to axon diameter (g-ratio) was normal in the patients examined. In seven patients with SMA II and five patients with SMA III, no sural nerve alterations were seen, and conduction velocity was normal. In addition to SMN1 gene deletions, homozygous NAIP gene deletions were detected in six out of seven infants with peripheral neuropathy, whereas there was no evidence of a large deletion including the multicopy markers C212 and Ag1-CA in two out of three families tested.

Conclusions: In this series of patients with SMA I through III who underwent sural nerve biopsy, there was significant sensory nerve pathology in severely affected patients with SMA type I, whereas there were no sensory nerve alterations clinically or morphologically in patients with milder SMA type II or III.




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