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Mutations associated with Sjögren-Larsson syndrome

N Tsukamoto1, C Chang, A Yoshida

  • 1Department of Biochemical Genetics, Beckman Research Institute of the City of Hope, Duarte, CA 91010, USA.

Annals of Human Genetics
|May 1, 1997
PubMed
Summary

Sjögren-Larsson syndrome (SLS) is linked to fatty aldehyde dehydrogenase (ALDH10) gene mutations. Researchers identified specific ALDH10 mutations in SLS patients, differing from common ALDH3 gene variations.

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Area of Science:

  • Biochemistry
  • Genetics
  • Molecular Biology

Background:

  • Sjögren-Larsson syndrome (SLS) is a rare autosomal disorder featuring ichthyosis, spastic neurological deficits, and intellectual disability.
  • SLS is associated with a deficiency in fatty aldehyde dehydrogenase (ALDH10), encoded by a gene on chromosome 17q11.2.
  • The ALDH3 isozyme, also involved in fatty aldehyde oxidation and located on chromosome 17q11.2, was investigated as a potential cause for similar syndromes.

Purpose of the Study:

  • To investigate mutations in the ALDH3 and ALDH10 genes in Sjögren-Larsson syndrome patients.
  • To differentiate between ALDH3 and ALDH10 gene abnormalities as causes of SLS.
  • To characterize the specific genetic mutations underlying SLS.

Main Methods:

  • Genetic analysis of the ALDH3 and ALDH10 loci in SLS patients.

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  • Mutation screening using techniques like sequencing and isoelectric focusing.
  • Analysis of ALDH10 mRNA levels in patient-derived fibroblast cells.

    • Main Results:

    • No causative mutations were found in the ALDH3 gene; identified variations were common in healthy individuals.
    • Fibroblast cells from SLS patients showed diminished ALDH10 expression and reduced ALDH10 mRNA levels.
    • Specific ALDH10 mutations identified include a combined deletion-insertion at intron 6/exon 7, a 2-base deletion causing premature termination, and a compound heterozygote mutation.

    Conclusions:

    • SLS is primarily caused by mutations in the ALDH10 gene, not ALDH3.
    • The identified ALDH10 mutations lead to reduced enzyme expression and function, characteristic of SLS.
    • Detailed characterization of these unique SLS-associated ALDH10 mutations provides insight into the syndrome's molecular basis.