Article (Scientific journals)
Muscleblind-like 2 knockout shifts adducin 1 isoform expression and alters dendritic spine dynamics of cortical neurons during brain development
Huang, C.-W.; Lee, K.-Y.; Lin, P.-T. et al.
2023In Neuropathology and Applied Neurobiology, 49 (2)
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Keywords :
Add1; adducin; alternative splicing; dendritic spine; muscleblind-like; myotonic dystrophy; neural development; Animals; Brain; Dendritic Spines; Mice; Myotonic Dystrophy; Protein Isoforms; alpha adducin; alpha2 spectrin; complementary DNA; cre recombinase; messenger RNA; muscleblind like 2 protein; protein; RNA binding protein; spectrin; unclassified drug; isoprotein; adolescent; adult; adulthood; alternative RNA splicing; animal cell; animal experiment; animal model; animal tissue; Article; brain cell; brain development; brain slice; cell density; cell structure; confocal microscopy; controlled study; dynamics; electroporation; fetus; frameshift mutation; gene knockout; molecular interaction; molecular pathology; mouse; multiphoton microscopy; neural stem cell; newborn; newborn period; nonhuman; protein expression; protein phosphorylation; synapse; animal; brain; genetics; metabolism; pathology
Abstract :
[en] Aims: Muscleblind-like 2 (MBNL2) plays a crucial role in regulating alternative splicing during development and mouse loss of MBNL2 recapitulates brain phenotypes in myotonic dystrophy (DM). However, the mechanisms underlying DM neuropathogenesis during brain development remain unclear. In this study, we aim to investigate the impact of MBNL2 elimination on neuronal development by Mbnl2 conditional knockout (CKO) mouse models. Methods: To create Mbnl2 knockout neurons, cDNA encoding Cre-recombinase was delivered into neural progenitors of Mbnl2flox/flox mouse brains by in utero electroporation. The morphologies and dynamics of dendritic spines were monitored by confocal and two-photon microscopy in brain slices and live animals from the neonatal period into adulthood. To investigate the underlying molecular mechanism, we further detected the changes in the splicing and molecular interactions of proteins associated with spinogenesis. Results: We found that Mbnl2 knockout in cortical neurons decreased dendritic spine density and dynamics in adolescent mice. Mbnl2 ablation caused the adducin 1 (ADD1) isoform to switch from adult to fetal with a frameshift, and the truncated ADD1 failed to interact with alpha-II spectrin (SPTAN1), a critical protein for spinogenesis. In addition, expression of ADD1 adult isoform compensated for the reduced dendritic spine density in cortical neurons deprived of MBNL2. Conclusion: MBNL2 plays a critical role in maintaining the dynamics and homeostasis of dendritic spines in the developing brain. Mis-splicing of downstream ADD1 may account for the alterations and contribute to the DM brain pathogenesis. © 2023 The Authors. Neuropathology and Applied Neurobiology published by John Wiley & Sons Ltd on behalf of British Neuropathological Society.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Huang, C.-W.;  Institute of Brain Science, College of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
Lee, K.-Y.;  Department of Neurology, Chang Gung Memorial Hospital, Keelung Branch, Keelung, Taiwan
Lin, P.-T.;  Chang Gung University, College of Medicine, Taoyuan, Taiwan
Nian, Fang-Shin ;  Université de Liège - ULiège > GIGA > GIGA Neurosciences - Molecular Regulation of Neurogenesis ; Institute of Clinical Medicine, College of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan ; Institute of Brain Science, College of Medicine, National Yang Ming Chiao Tung University, Taipei, 112, Taiwan
Cheng, Haw-Yuan  ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques ; Faculty of Medicine, College of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
Chang, C.-H.;  Brain Research Center, National Yang Ming Chiao Tung University, Taipei, Taiwan
Liao, C.-Y.;  Department of Biological Science and Technology, College of Biological Science and Technology, National Yang Ming Chiao Tung University, Hsinchu, Taiwan
Su, Y.-L.
Seah, C.
Li, C.
Chen, Y.-F.
Lee, M.-H.
Tsai, J.-W.
More authors (3 more) Less
Language :
English
Title :
Muscleblind-like 2 knockout shifts adducin 1 isoform expression and alters dendritic spine dynamics of cortical neurons during brain development
Publication date :
2023
Journal title :
Neuropathology and Applied Neurobiology
ISSN :
0305-1846
eISSN :
1365-2990
Publisher :
John Wiley and Sons Inc
Volume :
49
Issue :
2
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
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