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Related Experiment Videos

Neutral glycolipid abnormalities in a t-complex mutant mouse embryo.

T N Seyfried1, T Ariga

  • 1Department of Biology, Boston College, Chestnut Hill, Massachusetts 02167.

Biochemical Genetics
|December 1, 1992
PubMed
Summary

Neutral glycolipid analysis in twl/twl mutant mouse embryos reveals altered biosynthesis. Specific glycolipids like lactosylceramide and globotriaosylceramide were elevated, while glucosylceramide was reduced, suggesting a defect in glycolipid metabolism.

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Area of Science:

  • Developmental Biology
  • Glycobiology
  • Genetics

Background:

  • The twl mutation in mice, located within the T/t complex on chromosome 17, leads to embryonic lethality due to neural tube defects.
  • Previous research indicated potential disruptions in ganglioside biosynthesis associated with the twl mutation.

Purpose of the Study:

  • To investigate the neutral glycolipid content and distribution in normal and twl/twl mutant mouse embryos at embryonic day 11 (E-11).
  • To determine if the twl mutation affects neutral glycolipid biosynthesis, potentially explaining observed embryonic defects.

Main Methods:

  • Comparative analysis of neutral glycolipid profiles in whole embryos from normal and twl/twl mutant mice at E-11.
  • Quantification of specific neutral glycolipids, including glucosylceramide, lactosylceramide, globotriaosylceramide, globotetraosylceramide, and Forssman glycolipid.

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Main Results:

  • Total neutral glycolipid content was comparable between normal and mutant embryos.
  • Significant alterations in specific neutral glycolipid levels were observed in twl/twl mutants: lactosylceramide, globotriaosylceramide, and globotetraosylceramide were elevated, while glucosylceramide was reduced.
  • Forssman glycolipid showed a slight increase in mutant embryos.
  • Neutral glycolipid composition was uniform across embryonic head and body regions in normal embryos, suggesting widespread expression of abnormalities in mutants.

Conclusions:

  • The twl mutation is associated with significant changes in neutral glycolipid composition during mouse embryonic development.
  • These findings, along with previously reported ganglioside abnormalities, support the hypothesis of an inherited defect in glycolipid biosynthesis pathway in twl/twl mutants.
  • The observed glycolipid abnormalities may contribute to the embryonic lethality and neural tube defects seen in twl/twl mice.