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Multiple Sgip1 splice variants inhibit cannabinoid receptor 1 internalization.

Oleh Durydivka1, Matej Gazdarica1, Katerina Vecerkova2

  • 1Institute of Molecular Genetics of the Czech Academy of Sciences, Videnska 1083, 142 20 Prague, Czech Republic.

Gene
|October 2, 2023
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Summary

Researchers identified 15 splice variants of the SH3-containing GRB2-like protein 3-interacting protein 1 (Sgip1) in mouse brains, including 11 new ones. These variants showed similar stability and function in regulating cannabinoid receptor 1 internalization.

Keywords:
Alternative splicingCannabinoid receptorClathrin-mediated endocytosisIsoformMolecular cloningRNA

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Area of Science:

  • Molecular Biology
  • Neuroscience
  • Genetics

Background:

  • Alternative splicing generates diverse protein isoforms from a single gene.
  • SH3-containing GRB2-like protein 3-interacting protein 1 (Sgip1) is a brain protein regulating endocytosis and cannabinoid receptor 1 internalization.
  • While four Sgip1 isoforms are known, 20 splice variants are predicted in mice.

Purpose of the Study:

  • To clone and characterize Sgip1 splice variants from the mouse brain.
  • To investigate the functional differences and similarities among Sgip1 isoforms.
  • To propose a unified nomenclature for Sgip1 splice variants.

Main Methods:

  • Cloning of 15 Sgip1 splice variants from mouse brain cDNA.
  • Analysis of exon composition in the membrane phospholipid-binding and proline-rich regions.
  • Assessment of protein stability and inhibition of cannabinoid receptor 1 and µ-opioid receptor internalization.

Main Results:

  • 11 novel Sgip1 splice variants were identified, in addition to 4 previously described.
  • Splice variants differed in exon composition within specific functional domains.
  • All characterized Sgip1 isoforms exhibited similar stability and inhibited cannabinoid receptor 1 internalization similarly.
  • No Sgip1 isoforms affected µ-opioid receptor internalization.

Conclusions:

  • The study confirms and expands the known repertoire of Sgip1 splice variants.
  • Splicing variations in key domains do not significantly alter Sgip1 stability or its inhibitory effect on cannabinoid receptor 1 internalization.
  • A new classification system for Sgip1 splice variants is proposed to standardize nomenclature for future research.