Abstract
Genetic markers controlled by 21 genetic systems were studied in 13 families containing members suffering from various hereditary disorders involving ataxia. Classical cerebellar ataxia was present in four, Friedreich ataxia in two, hereditary spastic paraplegia in four, and the Charcot-Marie-Tooth syndrome in three families. In each family, every available member above the lowest age at onset observed in that family, was subjected to a thorough clinical investigation and blood was sampled for investigation of genetic markers.
The families with cerebellar ataxia and with Charcot-Marie-Tooth syndrome contained enough informative relatives to allow a formal linkage study using the lodscore method. Three of the pedigress with cerebellar ataxia gave evidence of linkage between the disease and the HLA system with a combined lodscore of 2.128 at a recombination fraction θ of 0.05 for both sexes combined. The recombination fraction was considerably higher in females than in males, although the difference between the two sexes was not statistically significant.
Negative lodscores were obtained for the remaining family with cerebellar ataxia, which might be due to the fact that this family only provided information on recombination in females. However, the clinical features in this family differed from those in the other three families by a significantly higher frequency of dementia and pyramidal tract lesions. Based on these observations and on contradictory results in the literature concerning linkage between cerebellar ataxia and HLA, we suggest that there are two forms of cerebellar ataxia: One (CA1) linked to HLA with symptoms restricted to lesions in the cerebellum and spinocerebellar system and another (CA2) not linked to HLA with symptoms from more wide-spread lesions of the CNS.
None of the other genetic markers (except perhaps GLO) showed linkage to the cerebellar ataxias. Negative lodscores throughout with all 21 genetic markers were found in the families with Charcot-Marie-Tooth syndrome.
There was no evidence for linkage between HLA on the one hand and Friedreich ataxia or hereditary spastic paraplegia on the other.
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Abbreviations
- HA :
-
Hereditary ataxias
- HLA :
-
Major histocompatibility system
- CA :
-
Cerebellar ataxia
- FA :
-
Friedreich ataxia
- HSP :
-
Hereditary spastic paraplegia
- CMT :
-
Charcot-Marie-Tooth syndrome
- MS :
-
Multiple sclerosis
- Hp :
-
Haptoglobin
- Gc :
-
Group-specific component
- PGM :
-
Phosphoglucomutase, locus 1
- SP (AcP) :
-
Acid phosphatase
- AK :
-
Adenylatekinase
- PGD :
-
6-phosphogluconatedehydrogenase
- ADA :
-
Adenosinedeaminase
- GPT :
-
Glutamate pyruvat transaminase
- GT :
-
Galaktose-1-phosphat uridylyltransferase
- EsP :
-
Carboxylesterase D
- GLO :
-
Glyoxylase I
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This study was aided by grants from Warwara Larsen's Foundation, the Danish Multiple Sclerosis Society and the Medical Research Council
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Pedersen, L., Platz, P., Ryder, L.P. et al. A linkage study of hereditary ataxias and related disorders. Hum Genet 54, 371–383 (1980). https://doi.org/10.1007/BF00291585
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DOI: https://doi.org/10.1007/BF00291585