title: Behavior training reverses asymmetry in hippocampal transcriptome of the cav3.2 knockout mice.
abstract: Homozygous Cav3.2 knockout mice, which are defective in the pore-forming subunit of a low voltage activated T-type calcium channel, have been documented to show impaired maintenance of late-phase long-term potentiation (L-LTP) and defective retrieval of context-associated fear memory. To investigate the role of Cav3.2 in global gene expression, we performed a microarray transcriptome study on the hippocampi of the Cav3.2-/- mice and their wild-type littermates, either naïve (untrained) or trace fear conditioned. We found a significant left-right asymmetric effect on the hippocampal transcriptome caused by the Cav3.2 knockout. Between the naive Cav3.2-/- and the naive wild-type mice, 3522 differentially expressed genes (DEGs) were found in the left hippocampus, but only 4 DEGs were found in the right hippocampus. Remarkably, the effect of Cav3.2 knockout was partially reversed by trace fear conditioning. The number of DEGs in the left hippocampus was reduced to 6 in the Cav3.2 knockout mice after trace fear conditioning, compared with the wild-type naïve mice. To our knowledge, these results demonstrate for the first time the asymmetric effects of the Cav3.2 and its partial reversal by behavior training on the hippocampal transcriptome.
authors.affiliation: Department of Molecular Biology and Human Genetics, Tzu Chi University, Hualien, Taiwan.
authors.forename: Ni-Chun
authors.initials: NC
authors.lastname: Chung
authors.affiliation: Institute of Biomedical Informatics, National Yang-Ming University, Taipei, Taiwan.
authors.forename: Ying-Hsueh
authors.initials: YH
authors.lastname: Huang
authors.affiliation: Institute of Biomedical Informatics, National Yang-Ming University, Taipei, Taiwan.
authors.forename: Chuan-Hsiung
authors.initials: CH
authors.lastname: Chang
authors.affiliation: Department of Chemical and Biomolecular Engineering, University of California Los Angeles, Los Angeles, California, United States of America.
authors.forename: James C
authors.initials: JC
authors.lastname: Liao
authors.affiliation: Institute of Biomedical Informatics, National Yang-Ming University, Taipei, Taiwan.
authors.forename: Chih-Hsien
authors.initials: CH
authors.lastname: Yang
authors.affiliation: Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan.
authors.forename: Chien-Chang
authors.initials: CC
authors.lastname: Chen
authors.affiliation: Department of Molecular Biology and Human Genetics, Tzu Chi University, Hualien, Taiwan; Institute of Medical Sciences, Tzu Chi University, Hualien, Taiwan.
authors.forename: Ingrid Y
authors.initials: IY
authors.lastname: Liu
mesh_terms: D000818:Animals; D001522:Behavior, Animal; D020747:Calcium Channels, T-Type / Q000172:deficiency* / Q000235:genetics*; D003213:Conditioning, Psychological; D005239:Fear / Q000523:psychology; D055786:Gene Knockout Techniques; D006624:Hippocampus / Q000378:metabolism* / Q000502:physiology; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D059467:Transcriptome
chemical_list: C504883:Cacna1h protein, mouse; D020747:Calcium Channels, T-Type