We describe a family carrying the Thr148Met mutation in the P0 gene. Contra
ry to other neuropathies caused by myelin gene defects, no demyeliantion co
uld be found in our biopsies. Based on follow up examinations, extensive mo
rphometry and immunohistochemical analysis we suggest that the mild hypomye
lination documented in our family secondarily causes axonal degeneration an
d axonal loss of large and small fibers which predominates the clinical pic
ture (C) 2001 Elsevier Science B.V. All fights reserved.