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American Journal of Human Genetics logoLink to American Journal of Human Genetics
. 1998 Feb;62(2):301–310. doi: 10.1086/301699

Ataxia with isolated vitamin E deficiency: heterogeneity of mutations and phenotypic variability in a large number of families.

L Cavalier 1, K Ouahchi 1, H J Kayden 1, S Di Donato 1, L Reutenauer 1, J L Mandel 1, M Koenig 1
PMCID: PMC1376876  PMID: 9463307

Abstract

Ataxia with vitamin E deficiency (AVED), or familial isolated vitamin E deficiency, is a rare autosomal recessive neurodegenerative disease characterized clinically by symptoms with often striking resemblance to those of Friedreich ataxia. We recently have demonstrated that AVED is caused by mutations in the gene for alpha-tocopherol transfer protein (alpha-TTP). We now have identified a total of 13 mutations in 27 families. Four mutations were found in >=2 independent families: 744delA, which is the major mutation in North Africa, and 513insTT, 486delT, and R134X, in families of European origin. Compilation of the clinical records of 43 patients with documented mutation in the alpha-TTP gene revealed differences from Friedreich ataxia: cardiomyopathy was found in only 19% of cases, whereas head titubation was found in 28% of cases and dystonia in an additional 13%. This study represents the largest group of patients and mutations reported for this often misdiagnosed disease and points to the need for an early differential diagnosis with Friedreich ataxia, in order to initiate therapeutic and prophylactic vitamin E supplementation before irreversible damage develops.

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Selected References

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