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Characterization of Rett Syndrome-like phenotypes in Mecp2-knockout rats.

Yang Wu1, Weiwei Zhong1, Ningren Cui1

  • 1Department of Biology, Georgia State University, 50 Decatur Street, Atlanta, GA 30302 USA.

Journal of Neurodevelopmental Disorders
|June 18, 2016
PubMed
Summary

A new Mecp2-deficient rat model shows Rett Syndrome (RTT) symptoms similar to mice, offering a valuable alternative for RTT research, especially when larger animal models are needed.

Keywords:
BehaviorsBreathingLocus coeruleusMecp2-null ratRett syndrome

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Area of Science:

  • Neuroscience
  • Genetics
  • Animal Models

Background:

  • Rett Syndrome (RTT) is a neurodevelopmental disorder stemming from MECP2 gene disruption.
  • Existing Mecp2-deficient mouse models are crucial for RTT research.
  • Validation in alternative species is necessary due to potential species-specific differences.

Purpose of the Study:

  • To characterize the phenotypes of a novel Mecp2 (-/Y) rat model.
  • To compare the RTT-like symptoms in rats with the established Mecp2 (tm1.1Bird) mouse model.
  • To assess the utility of the rat model for RTT research.

Main Methods:

  • Systematic evaluation of RTT-like phenotypes in Mecp2 (-/Y) rats and mice.
  • Assessment of motor function (grip strength, locomotion) and autism-like behaviors (three-chamber test).
  • Recording of breathing activity and neuronal activity in the locus coeruleus (LC).

Main Results:

  • Mecp2 (-/Y) rats exhibited growth retardation, malocclusion, reduced movement, weaker grip strength, and impaired locomotion.
  • Significant defects in social interaction, altered breathing patterns (variations, apnea), and increased LC neuronal firing were observed.
  • The rat model displayed many RTT-like symptoms comparable to the mouse model, with some variations in severity and lifespan.

Conclusions:

  • The Mecp2 (-/Y) rat model effectively recapitulates key RTT-like symptoms.
  • This rat model serves as a valuable alternative to mouse models, particularly when larger body size is a consideration for RTT studies.