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Skeletal Phenotype Analysis of a Conditional Stat3 Deletion Mouse Model
Published on: July 3, 2020
Altered heparan sulfate structure in mice with deleted NDST3 gene function
Srinivas R Pallerla1, Roger Lawrence, Lars Lewejohann
1Department of General Zoology and Genetics, Westfälische Wilhelms-Universität Münster, Münster, Germany.
The Journal of Biological Chemistry
|April 4, 2008
Summary
The GlcNAc N-deacetylase/N-sulfotransferase 3 (NDST3) enzyme is not essential for mouse development, as other NDST isoforms compensate for its loss. However, NDST3 contributes to heparan sulfate synthesis in specific brain regions.
Area of Science:
- Biochemistry
- Genetics
- Developmental Biology
Background:
- Heparan sulfate (HS) is a crucial glycosaminoglycan involved in various biological processes.
- GlcNAc N-deacetylase/N-sulfotransferase (NDST) enzymes are key regulators of HS structure and function.
- The specific roles of individual NDST isoforms, particularly NDST3, in development and homeostasis are not fully understood.
Purpose of the Study:
- To investigate the in vivo function of the NDST3 enzyme.
- To analyze the impact of NDST3 deficiency on HS synthesis and overall development.
- To determine the compensatory mechanisms involving other NDST isoforms.
Main Methods:
- Generation and analysis of NDST3 knockout mice.
- Creation of compound mutant mice deficient in combinations of NDST isoforms (NDST2;NDST3 and NDST1;NDST3).
- Biochemical analysis of HS composition in various tissues, including dissected brain regions.
Main Results:
- NDST3(-/-) mice exhibit normal development, fertility, and only subtle abnormalities, indicating functional compensation by other NDSTs.
- Compound mutants lacking NDST2 and NDST3 develop normally, highlighting non-essential roles for these isoforms individually.
- NDST1(-/-);NDST3(-/-) compound mutant embryos show developmental defects due to severe HS undersulfation, revealing NDST3's contribution when NDST1 is absent.
- Regional analysis of HS sulfation in NDST3 mutant brains indicates tissue-specific roles for NDST3 in HS modification.
Conclusions:
- NDST3 is not essential for overall mouse development or homeostasis.
- NDST3 plays a region-specific role in heparan sulfate synthesis, particularly in the adult brain.
- Other NDST isoforms can compensate for the loss of NDST3 function to varying degrees, ensuring developmental integrity.
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