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A Study of Striatal Markers as Disease Modifiers in Huntington's Disease

Laetitia Francelle 1
1 LMN - Laboratoire des Maladies Neurodégénératives - UMR 9199
MIRCEN - Service MIRCEN : DRF/JACOB, CNRS - Centre National de la Recherche Scientifique : UMR 9199
Abstract : Huntington’s disease (HD) is a neurodegenerative disorder caused by the mutation of huntingtin (Htt) gene, which leads to an abnormal polyglutamine expansion in the Htt protein.Whereas mutant Htt (mHtt) is ubiquitously expressed in the brain, it preferentially affects the striatum. Our hypothesis is that genes products selectively expressed in the striatum could be involved in the high vulnerability of the striatum. From this hypothesis, numerous teams studied “markers of the striatum”, that are genes product enriched in the striatum whose expression are up- or down-regulated in HD compared to healthy condition.During my thesis, I studied three of these striatal markers: the long intergenic non-coding RNA Abhd11os, and the two proteins µ-crystallin (CRYM) and doublecortin-like kinase 3 (DCLK3). A preliminary study from the laboratory has shown that these three markers have neuroprotective effects against a toxic fragment of mHtt in vivo. So, the aims of my thesis were to further characterize these three ill-defined disease modifiers and to better understand the putative molecular mechanisms underlying their neuroprotective effects against mHtt.I also conducted a translational study on DCLK3, whose results validate the high therapeutic potential of this protein.The elucidation of the mechanisms underlying the neuroprotective effects of these disease modifiers against mHtt toxicity will require further studies, but new trails can be envisioned, according to their characteristics.My study has enlightened new therapeutic targets and more globally gives an overview of molecular mechanisms to modulate to induce neuroprotective effects in this context, leading to new hypothesis explaining striatal vulnerability in HD.
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Laetitia Francelle. A Study of Striatal Markers as Disease Modifiers in Huntington's Disease. Neurons and Cognition [q-bio.NC]. Université Paris Sud - Paris XI, 2014. English. ⟨NNT : 2014PA11T070⟩. ⟨tel-02003499⟩

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