Clinicopathological aspects of the neuropathy of neurogastrointestinal encephalomyopathy (MNGIE) in four patients including two with a Charcot-Marie-Tooth presentation.
Fiche publication
Date publication
juin 2005
Auteurs
Membres identifiés du Cancéropôle Est :
Pr BEDENNE Laurent
Tous les auteurs :
Said G, Lacroix C, Plante-Bordeneuve V, Messing B, Slama A, Crenn P, Nivelon-Chevallier A, Bedenne L, Soichot P, Manceau E, Rigaud D, Guiochon-Mantel A, Matuchansky C
Lien Pubmed
Résumé
We report on four patients with severe polyneuropathy associated with intestinal pseudoobstruction (MNGIE). Three patients presented characteristic supranuclear ophthalmoplegia, and hyperdense signals on T2 weighted cerebral MRI and dystrophic mitochondria in Schwann cells and in endothelial cells in nerve biopsy specimens. Two of these patients had a Charcot-Marie-Tooth (CMT) presentation. All three were heterozygous for a recessively transmitted double substitution in the TP gene: Glu286Lys/Glu289Ala, Asp156Gly/Leu177Pro and Glu289Ala/Gly387Asp. The fourth patient, who was the only patient of this series with an affected sib, had no oculomotor manifestations, nor T2 hyperdense signals on brain MRI, and no TP gene mutation and or morphological abnormalities of mitochondria on electron microscopic examination. He was the only patient of this series with an affected sib. The three patients with the full MNGIE syndrome died before the age of 30 years. Detailed results of nerve pathology show that severe axonal degeneration is associated with segmental abnormalities of the myelin sheath in this syndrome which appears genetically heterogeneous. Our findings suggest that only ophthalmoplegia and hyperdense signals on cerebral MRI are directly related to the mitochondriopathy.
Référence
J Neurol. 2005 Jun;252(6):655-62