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Related Experiment Videos

Different forms of Ultrabithorax proteins generated by alternative splicing are functionally equivalent.

A Busturia1, I Vernos, A Macias

  • 1Centro de Biología Molecular (CSIC-UAM), Universidad Autónoma, Madrid, Spain.

The EMBO Journal
|November 1, 1990
PubMed
Summary

Two new Ubx mutations in Drosophila reveal that altered Ubx protein arrays can support normal function. This suggests Ubx proteins are developmentally equivalent, with phenotypes arising from regulatory region disruption.

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Area of Science:

  • Developmental Biology
  • Genetics
  • Molecular Biology

Background:

  • The Ultrabithorax (Ubx) gene in Drosophila melanogaster is crucial for embryonic development, producing multiple protein isoforms via alternative splicing of microexons.
  • Understanding how variations in Ubx protein expression affect development is key to deciphering gene regulation and function.

Purpose of the Study:

  • To characterize two novel viable Ubx mutations in Drosophila.
  • To investigate the functional consequences of altered Ubx protein arrays on adult phenotypes and development.

Main Methods:

  • Isolation and phenotypic analysis of new viable Ubx mutations.
  • Molecular characterization of mutations using genetic mapping and sequencing.
  • Analysis of Ubx protein expression patterns in mutant flies.

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Main Results:

  • Two new viable Ubx mutations were identified, exhibiting near wild-type adult phenotypes.
  • One mutation, UbxMX17, involves an inversion disrupting a microexon and leading to an abnormal Ubx protein repertoire.
  • Despite abnormal protein profiles, Ubx function was largely preserved, indicating developmental equivalence of Ubx isoforms.

Conclusions:

  • The diverse Ubx protein forms generated by alternative splicing are functionally interchangeable during development.
  • The observed minor mutant phenotypes in UbxMX17 are likely attributable to disruption of cis-regulatory elements rather than the altered protein set.