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Related Experiment Videos

Mouse Dach2 mutants do not exhibit gross defects in eye development or brain function.

Richard J Davis1, Yakov I Pesah, Mark Harding

  • 1Department of Pathology, Baylor College of Medicine, Houston, Texas 77030, USA.

Genesis (New York, N.Y. : 2000)
|February 14, 2006
PubMed
Summary

Mice lacking Dach2 show normal development, while combined Dach1 and Dach2 loss leads to early death but not the severe eye and limb defects seen in fruit flies. This suggests functional differences in Dach gene roles.

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Area of Science:

  • Developmental Biology
  • Genetics
  • Comparative Genomics

Background:

  • The dachshund gene family plays a crucial role in the development of eyes, brains, and limbs across species.
  • Vertebrate homologs Dach1 and Dach2 are expressed in developing neural and limb tissues, hinting at conserved functions.

Purpose of the Study:

  • To investigate the in vivo function of Dach2 in mammalian development.
  • To explore the functional conservation and divergence of dachshund/Dach genes between Drosophila and mammals.
  • To characterize the developmental consequences of combined Dach1 and Dach2 loss in mice.

Main Methods:

  • Generation and phenotypic analysis of Dach2 knockout mice.
  • Histochemical analysis of ocular development in Dach2 mutants.

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  • Comprehensive neurological behavioral assays.
  • Generation and analysis of Dach1; Dach2 double mutant mice.

    • Main Results:

    • Dach2 mutant mice are viable, fertile, and exhibit normal eye development and behavior.
    • Dach1; Dach2 double mutant mice exhibit postnatal lethality, similar to Dach1 homozygotes.
    • Despite lethality, Dach double mutants possess eyes and limbs, contrasting with severe defects in Drosophila dachshund mutants.

    Conclusions:

    • Dach2 is not essential for viability or gross development of the eye and nervous system in mice.
    • While Dach1 and Dach2 share some developmental roles, significant functional divergence exists between mammalian Dach genes and Drosophila dachshund, particularly in embryonic eye and limb patterning.
    • The Dach gene family exhibits both conserved and distinct functions across species.