Clinical, Electrophysiological and Pathological Characteristics in Hereditary Neuropathy with Liability to Pressure Palsies (HNPP) with Chromosome 17p11.2-p12 Deletion.
- Author:
Seung Min KIM
1
;
Byung Ok CHOI
;
Il Nam SUNWOO
;
Jin Sung LEE
;
Ki Bum SUNG
Author Information
1. Department of Neurology, College of Medicine Yonsei University.
- Publication Type:Original Article
- Keywords:
Hereditary neuropathy with liability to pressure palsies (HNPP);
Chromosome 17p11.2-p12 deletion;
Clinical;
Electrophysiological;
Morphological aspect
- MeSH:
Action Potentials;
Biopsy;
DNA;
Humans;
Myelin Sheath;
Neural Conduction;
Paralysis*;
Peripheral Nerves;
Sural Nerve;
Wills
- From:Journal of the Korean Neurological Association
2001;19(3):251-259
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
BACKGROUND: Hereditary neuropathy with liability to pressure palsies (HNPP) is a peripheral nerve disorder characterized by autosomal dominant inheritance, recurrent pressure palsies, reduced motor and sensory conduction velocities and sausage-like swellings (tomacula) of myelin sheaths in nerve biopsy. A 1.5-Mb deletion in chromosome 17p11.2- p12 is present in the majority but not all cases of HNPP. The aim of the present study was to evaluate the clinical, electrophysiological and morphological aspects of HNPP patients associated with chromosome 17p11.2-p12 deletion. METHODS: To detect the presence of the deletion, the DNA of the patients was analyzed with pVAW409R3 (D17S122). An electrophysiological study was done in all patients. Sural nerve biopsy with teasing was done in three patients. RESULTS: DNA analysis and electrophysiological tests revealed the deletion in 8 families and 16 patients. Nerve conduction studies demonstrated diffuse mild to moderate slowing of nerve conduction velocities especially worse over the common entrapment sites, regardless of clinical manifestations. The long duration of compound muscle and nerve action potentials without conduction blocks or dispersion is characteristic of patients with HNPP. The tomacula of myelin sheaths was found on sural nerve teasing. CONCLUSIONS: We report the clinical, electrophysiological and morphological aspects of the Korean HNPP patients associated with chromosome 17p11.2-p12 deletion. (J Korean Neurol Assoc 19(3):251~259, 2001)
