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Small nerve fiber involvement in CMT1A.

Maria Nolano1, Fiore Manganelli2, Vincenzo Provitera2

  • 1From the Neurology Division (M.N., V.P., A.S., G.C.), "Salvatore Maugeri" Foundation, Institute of Telese Terme; the Department of Neurosciences, Reproductive and Odontostomatological Sciences (F.M., C.P., R.I., L.S.), University Federico II of Naples, Italy; and the Department of Neurology (M.E.S.), University of Iowa, Iowa City. maria.nolano@fsm.it.

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Summary

Small nerve fiber damage, including epidermal nerve fibers (ENF) and sudomotor nerves, is common in Charcot-Marie-Tooth type 1A (CMT1A) and linked to symptoms. This nerve loss worsens with age and impacts sensory and autonomic functions.

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Area of Science:

  • Neurology
  • Dermatology
  • Genetics

Background:

  • Charcot-Marie-Tooth type 1A (CMT1A) is a progressive hereditary neuropathy.
  • Small nerve fiber involvement in CMT1A is not fully understood.

Purpose of the Study:

  • To investigate the role of small somatic and autonomic nerve fibers in CMT1A patients.
  • To correlate nerve fiber morphology with clinical and physiological findings.

Main Methods:

  • Biopsies from CMT1A patients and controls were analyzed using immunofluorescence and confocal microscopy.
  • Quantified epidermal nerve fibers (ENF), Meissner corpuscles (MC), and sudomotor nerves.
  • Correlated morphologic data with sensory testing, sudomotor output, and reflexes.

Main Results:

  • Found length-dependent loss of ENFs, worsening with age.
  • Observed reduced MCs, intrapapillary myelinated endings (IME), and sudomotor nerves.
  • ENF loss correlated with impaired heat-pain and tactile sensation; sudomotor nerve loss correlated with reduced sweating.

Conclusions:

  • Small somatic and autonomic nerve fibers are significantly affected in CMT1A.
  • This nerve damage contributes to patient symptoms.
  • Clinical awareness of small fiber neuropathy in CMT1A can improve patient management.