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Tenascin mRNA isoforms in the developing mouse brain

U Dörries1, M Schachner

  • 1Department of Neurobiology, Swiss Federal Institute of Technology, Zürich.

Journal of Neuroscience Research
|February 15, 1994
PubMed
Summary
This summary is machine-generated.

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Researchers identified novel tenascin splice variants in the developing mouse brain using PCR. These variants, particularly high molecular weight isoforms, decrease with development, showing evolutionary conservation and CNS-specific expression.

Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Neuroscience

Background:

  • Tenascin, an extracellular matrix glycoprotein, exhibits heterogeneity in the developing mouse cerebellum.
  • This heterogeneity is attributed to alternative splicing of tenascin mRNA in fibronectin type III repeats.

Purpose of the Study:

  • To systematically analyze tenascin mRNA isoforms responsible for protein heterogeneity.
  • To investigate developmental changes in tenascin mRNA expression and splicing patterns.

Main Methods:

  • Polymerase chain reaction (PCR) to isolate tenascin splice variants from mouse brain.
  • Northern blot analysis to assess mRNA expression levels.
  • Southern blot analysis to characterize amplified mRNA isoforms.
  • In situ hybridization to determine tissue-specific expression.

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Main Results:

  • Tenascin mRNA expression decreases during development, with larger isoforms declining more significantly.
  • Four predominant splice variants were identified, differing in the number of fibronectin type III repeat insertions (six, five, one, or none).
  • A novel splice variant with six fibronectin type III repeats, including a conserved repeat similar to human tenascin, was discovered.
  • This novel repeat is specific to the six-repeat variant and predominantly expressed in the central nervous system.

Conclusions:

  • Alternative splicing of tenascin mRNA generates significant molecular diversity in the mouse brain.
  • Developmental regulation affects the expression of different tenascin isoforms.
  • The novel six-repeat tenascin isoform and its conserved repeat highlight evolutionary conservation and specific CNS roles.