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Altered olfactory responses in Fmr1 KO mice.

Jan Tuma1,2, Amtul-Noor Rana1, Teena Philip1

  • 1The Department of Cellular and Integrative Physiology, The University of Texas Health Science Center at San Antonio, San Antonio, TX, USA.

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Summary

Fragile X syndrome (FXS) mouse models show altered responses to odors, including less interest in social scents and larger olfactory bulbs. These findings suggest olfactory system changes may contribute to FXS-related behaviors.

Keywords:
Fmr1 KO miceFragile X syndromeOdor discrimination testOlfactory behaviorOlfactory bulb

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Area of Science:

  • Neuroscience
  • Genetics
  • Behavioral Science

Background:

  • Fragile X syndrome (FXS) is a genetic disorder linked to social and sensory processing deficits.
  • Altered olfactory processing is hypothesized to contribute to aberrant social behaviors in FXS.
  • Previous research on olfaction in FXS animal models yielded inconsistent findings.

Purpose of the Study:

  • To investigate olfactory behaviors and olfactory bulb structure in Fmr1 knock-out (KO) mice, a model for FXS.
  • To determine if olfactory deficits contribute to social behavior alterations in FXS.

Main Methods:

  • Behavioral analysis of olfactory responses to non-social and social odors in Fmr1 KO and wild-type (WT) mice.
  • Measurement of olfactory bulb volume in Fmr1 KO and WT mice.

Main Results:

  • Fmr1 KO mice exhibited increased sniffing duration for non-social odors upon initial exposure.
  • Fmr1 KO mice did not differentiate behavioral responses between various non-social odors, unlike WT mice.
  • Fmr1 KO males showed reduced sniffing time for female urine odor compared to WT males.
  • Fmr1 KO mice presented with an enlarged olfactory bulb.

Conclusions:

  • Fmr1 KO mice display atypical olfactory behaviors, suggesting sensory processing alterations.
  • Structural changes in the olfactory bulb are observed in Fmr1 KO mice.
  • These olfactory system differences may underlie some behavioral characteristics associated with Fragile X syndrome.