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Four repeat MAP2 isoforms in human and rat brain

S Kindler1, C C Garner

  • 1California Institute of Technology, Division of Biology 216-76, Pasadena 91125.

Brain Research. Molecular Brain Research
|October 1, 1994
PubMed
Summary
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New microtubule-associated protein 2 (MAP2) isoforms with four (4R) repeats, not three (3R), exist in mammalian brain. These 4R-MAP2 variants show developmental changes in rat brain, with higher levels in the cerebellum.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Protein Isoforms

Background:

  • Microtubule-associated protein 2 (MAP2) is crucial for microtubule stability in mammalian brain.
  • Known MAP2 isoforms differ in projection domains, affecting microtubule spacing.
  • Variations in microtubule-binding domains of MAPs like MAP4 and tau are documented.

Purpose of the Study:

  • To identify and characterize novel MAP2 isoforms in human and rat brain.
  • To investigate the presence and distribution of MAP2 isoforms with varying tandem repeats in the microtubule-binding domain.
  • To examine the developmental expression patterns of these novel MAP2 isoforms in the rat brain.

Main Methods:

  • Analysis of mRNA sequences to identify variations in MAP2 tandem repeats.

Related Experiment Videos

  • Quantitative assessment of different MAP2 mRNA variants (3R vs. 4R) in brain tissue.
  • Comparison of 4R-MAP2 mRNA levels during early postnatal rat brain development.

    • Main Results:

    • Discovery of MAP2 isoforms containing four (4R) tandem repeats in the microtubule-binding domain, in addition to the known three (3R) repeats, in human and rat brain.
    • The additional sequence in 4R-MAP2 is located between the first and second repeat of the 3R-MAP2 sequence.
    • Expression analysis revealed that 4R-Hwt MAP2 mRNA levels decrease during early postnatal development in rats, while 4R-Lwt MAP2 mRNA levels remain constant.
    • 4R-MAP2 mRNA levels are generally low compared to 3R-MAP2, with the highest relative abundance observed in the cerebellum.

    Conclusions:

    • Mammalian brain harbors MAP2 isoforms with four tandem repeats in their microtubule-binding domains, expanding the known structural diversity of MAP2.
    • The developmental regulation of 4R-Hwt MAP2 suggests a role in specific postnatal brain maturation processes.
    • The regional distribution, particularly the enrichment in the cerebellum, points to specialized functions of 4R-MAP2 isoforms in distinct brain areas.