Publications

Dernière publication 01/01/2019

PRRT2 deficiency induces paroxysmal kinesigenic dyskinesia by influencing synapt

Proline-rich transmembrane protein 2 (PRRT2) was identified as the causative gene of paroxysmal kinesigenic choreoathetosis (PKC) as well as...

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    [title] => PRRT2 deficiency induces paroxysmal kinesigenic dyskinesia by influencing synapt
    [paragraph] => PRRT2 deficiency induces paroxysmal kinesigenic dyskinesia by influencing synaptic function in the primary motor cortex of rats
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Authors
J Mo, B Wang, X Zhu, X Wu, Y Liu

 Lab
State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, School of Basic Medicine, Peking Union Medical College, Beijing 100005, China
Journal
Neurobiology of Disease
Abstract
Proline-rich transmembrane protein 2 (PRRT2) was identified as the causative gene of paroxysmal kinesigenic choreoathetosis (PKC) as well as various other neurological diseases. However, the molecular mechanisms of how mutant PRRT2 leads to abnormal synaptic function and triggers PKC are still obscure. We generated a Prrt2 truncated mutant rat model which shows spontaneous PKC-like attacks with a relative low frequency as well as increased susceptibility to pentylenetetrazol (PTZ)-induced seizures. We demonstrate that PRRT2 is expressed on both pre- and post-synaptic membranes in the M1 cortex. PRRT2 negatively regulates SNARE complex assembly through interaction with SNAP25, STX1A, and VAMP2. In the M1 cortex of the rat model, release of amino acid neurotransmitters is increased. Protein levels of glutamate receptor subunit GRIA1 are significantly increased in PRRT2 mutant rats, while GABA receptor subunits GABRA1 are significantly reduced. Both frequency and amplitude of mEPSC are significantly increased, while amplitude of mIPSC is decreased and the ratio of mEPSC/mIPSC is significantly increased. The balance between excitatory and inhibitory neuronal activity is disrupted, which could lead to abnormal neuronal hyperexcitability. These results provide new insights into the function of PRRT2 in synaptic transmission and movement control, as well as the pathogenic mechanism underlying PKC.
BIOSEB Instruments Used
Grip strength test (BIO-GS3)
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Une méthode simple pour quantifier objectivement la force musculaire des rats et souris et l'effet de drogues, toxines, maladies musculaires (ex: myopathie) et neurodégénératives. Cette mesure de force est souvent employée en association avec le test de coordination motrice ROTAROD: un sujet présentant une coordination normale montrera des résultats médiocres en cas de faible force musculaire. Un must pour vos recherches sur l'activité, la coordination et le contrôle musculaire: particulièrement utile pour vos études sur les maladies de Parkinson et Huntington.
Nouveautés GS4 - 2023: Écran couleur rétroéclairé (meilleure lisibilité), pédale de remise à zéro, durée de batterie optimisée, taille de mémoire augmentée à 500 valeurs, compteur d'animaux, port USB (transfert de données/charge)

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