PMP22 messenger RNA levels in skin biopsies: Testing the effectiveness of a Charcot-Marie-Tooth 1A biomarker

Lucilla Nobbio, Davide Visigalli, Davide Radice, Elisabetta Fiorina, Alessandra Solari, Giuseppe Lauria, Mary M. Reilly, Lucio Santoro, Angelo Schenone, Davide Pareyson

Research output: Contribution to journalArticlepeer-review


Charcot-Marie-Tooth disease type 1A (CMT1A) is associated with increased gene dosage for PMP22. Therapeutic approaches are currently aiming at correcting PMP22 over-expression. It is unknown whether PMP22 can be used as a biological marker of disease progression and therapy efficacy. We performed quantitative real-time polymerase chain reaction on skin biopsies of 45 patients with CMT1A, obtained at study entry and after 24-months of treatment either with ascorbic acid or placebo. Data of a subgroup of patients were also compared with matched healthy subjects. Finally, we analysed PMP22 messenger RNA levels in sural nerve biopsies. We did not find significant differences in the levels of any known PMP22 transcripts in treated or untreated patients with CMT1A, thus confirming that ascorbic acid does not impact on the molecular features of CMT1A. Most importantly, we did not observe any correlation between PMP22 messenger RNA levels and the different clinical and electrophysiological outcome measures, underscoring the weakness of PMP22 to mirror the phenotypic variability of patients with CMT1A. We did not find increased PMP22 messenger RNA levels in skin and sural nerve biopsies of patients with CMT1A compared with relative controls. In conclusion, this study shows that ascorbic acid does not impact on PMP22 transcriptional regulation and PMP22 is not a suitable biomarker for CMT1A.

Original languageEnglish
Pages (from-to)1614-1620
Number of pages7
Issue number6
Publication statusPublished - Jun 1 2014


  • ascorbic acid
  • biological marker
  • CMT1A
  • PMP22

ASJC Scopus subject areas

  • Clinical Neurology
  • Arts and Humanities (miscellaneous)


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