Friedreich's Ataxia 1979: An Overview

Author:

Barbeau A.

Abstract

SummaryThis overview summarizes the investigations carried out during the second part of Phase Two of the Quebec Cooperative Study of Friedreich's Ataxia. These investigations outline in more details the fundamental role played by an abnormality in the fatty acid composition (deficient linoleic acid, 18:2) of the cholesterol esters of high density lipoproteins (HDL) in the phenotypic expression of the disease. They postulate a defective incorporation of linoleic acid to surface phos-phatidylcholine of chylomicrons and consequent relative and absolute decreases in lipoproteinprotein components because of overpacking with defective cholesteryl esters. Secondarily to these changes, the postulated lack of activation of the lipoamide dehydrogenase (LAD) of the pyruvate dehydrogenase (PDH) complex could result in slow pyruvate oxidation, glucose intolerance, deficient synthesis of acetylcholine, and depletion of glutamic and aspartic acid pools. In parallel, abnormal phosphatidyl-choline molecules could be incorporated to membranes, resulting in specific defects in some functions of these membranes, including transport of calcium and I or taurine and myelinization. The framework of an understanding of Friedreich's ataxia is now available, but much fundamental and clinical work remains to be done to fill in and prove each one of these postulated steps.

Publisher

Cambridge University Press (CUP)

Subject

Clinical Neurology,Neurology,General Medicine

Reference15 articles.

1. Plasma lipids and lipoproteins in Friedreich's ataxia and Familial Spastic Ataxia — Evidence for an abnormal composition of high density lipoproteins.;Huang,1978

2. Cerebellar ataxia produced by 3-acetyl pyridine in rat.;Butterworth,1978

3. Extreme insulin resistance in ataxia telangiectasia.;Bar,1978

4. Cell-surface receptors in health and disease.;Blecher,1979

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