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Related Experiment Videos

Manifold decrease of sialic acid synthase in fetal Down syndrome brain.

T Gulesserian1, E Engidawork, M Fountoulakis

  • 1Department of Pediatrics, Medical University of Vienna, Vienna, Austria.

Amino Acids
|May 27, 2006
PubMed
Summary
This summary is machine-generated.

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Sialic acid synthase (SAS) is significantly reduced in the fetal brains of individuals with Down syndrome (DS). This finding in early pregnancy may explain developmental brain deficits in DS due to altered sialic acid metabolism.

Area of Science:

  • Neuroscience
  • Biochemistry
  • Genetics

Background:

  • Down syndrome (DS), or trisomy 21, is the leading genetic cause of intellectual disability.
  • Numerous biochemical abnormalities in fetal and adult DS brains offer insights into the molecular basis of cognitive impairment.

Purpose of the Study:

  • To investigate sialic acid metabolism in early second-trimester fetal brain tissue from individuals with and without DS.
  • Specifically, to quantify the activity of sialic acid synthase (SAS), an enzyme crucial for brain development.

Main Methods:

  • Protein profiling using 2D gel electrophoresis and MALDI-TOF/MS.
  • Quantification of SAS enzyme levels in fetal brain cortex samples.

Main Results:

Related Experiment Videos

  • Sialic acid synthase (SAS) was identified as a distinct protein spot.
  • SAS levels were found to be significantly reduced in the cerebral cortex of fetuses with DS compared to controls (P < 0.01).

    • Conclusions:

    • The substantial decrease in SAS in the DS fetal brain during the second trimester may contribute to observed cognitive deficits.
    • Reduced SAS activity can lead to impaired sialic acid metabolism, affecting the sialylation of critical brain proteins essential for development.