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Related Experiment Video

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Central Dysmyelination in SSADH-Deficient Humans and Mice.

Itay Tokatly Latzer1,2, Henry H C Lee1,3,4, Edward Yang5

  • 1Department of Neurology, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA.

Annals of Clinical and Translational Neurology
|July 31, 2025
PubMed
Summary

Succinic semialdehyde dehydrogenase deficiency (SSADHD) is linked to myelination abnormalities. Elevated GABA and GHB levels in patients correlate with reduced myelination, suggesting a role in oligodendrocyte maturation.

Keywords:
GABAinherited metabolic disordersmyelinsuccinic semialdehyde dehydrogenasewhite matter

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Genetics

Background:

  • Succinic semialdehyde dehydrogenase deficiency (SSADHD) is an inherited metabolic disorder.
  • Gamma-aminobutyric acid (GABA) accumulation occurs in SSADHD.
  • GABA plays a crucial role in neurotransmission and myelination.

Purpose of the Study:

  • To investigate the relationship between GABA and myelination abnormalities in SSADHD.
  • To explore GABA's role in myelination using patient and mouse models.

Main Methods:

  • Brain MRIs analyzed in 23 SSADHD patients and 21 controls using a myelination scoring system.
  • Correlation of myelination scores with clinical, biochemical, and genetic data.
  • Analysis of myelin-related gene expression in a mouse model of SSADHD.

Main Results:

  • SSADHD patients exhibited mild but significant dysmyelination compared to controls.
  • Lower myelination scores correlated with younger age and higher plasma GABA and GHB levels.
  • Mice with SSADHD showed reduced expression of key myelin-related genes.

Conclusions:

  • Excessive GABA and GHB in SSADHD may impair oligodendrocyte maturation and myelination.
  • Understanding dysmyelination in SSADHD offers insights into GABA's role in myelination.
  • This research may aid in monitoring SSADHD progression and managing white-matter disorders.