Metachromatic leukodystrophy: Multiple nonfunctional and pseudodeficiency alleles in a pedigree: Problems with diagnosis and counseling

Gordon S. Francis, Azad Bonni, Ning Shen, Peter Hechtman, Bassem Yamut, Stirling Carpenter, George Karpati, Patricia L. Chang

Research output: Contribution to journalArticle

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Abstract

Metachromatic leukodystrophy is due to deficiennt activity of arylsulfatse A, an enzyme important in myelin catabolism. The deficiency can be caused by different point mutations in the gene coding for arylsulfatase A (nonfunctional alleles). In addition, certain mutations result in low levels of enzyme activity detectable with artificial substrates in vitro but no clinical dysfunction (pseudodeficiency alleles). The described family has various combinations of normal, nonfunctional, and pseudodeficiency alleles that presented diagnostic and counseling dilemmas which were resolved at the genomic levle. We find no evidence that compound beterozygote individuals have subclinical involvement of the nervous system. We report the clinical, pathological, electrophysiological, imaging, biochemical, and genetic data of this family and discuss the difficulties in analyzing such pedigrees.

Original languageEnglish
Pages (from-to)212-218
Number of pages7
JournalAnnals of neurology
Volume34
Issue number2
DOIs
StatePublished - Aug 1993

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    Francis, G. S., Bonni, A., Shen, N., Hechtman, P., Yamut, B., Carpenter, S., Karpati, G., & Chang, P. L. (1993). Metachromatic leukodystrophy: Multiple nonfunctional and pseudodeficiency alleles in a pedigree: Problems with diagnosis and counseling. Annals of neurology, 34(2), 212-218. https://doi.org/10.1002/ana.410340218