Environment-dependent striatal gene expression in the BACHD rat model for Huntington disease

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作者
Arianna Novati
Thomas Hentrich
Zinah Wassouf
Jonasz J. Weber
Libo Yu-Taeger
Nicole Déglon
Huu Phuc Nguyen
Julia M. Schulze-Hentrich
机构
[1] University of Tübingen,Institute of Medical Genetics and Applied Genomics
[2] Lausanne University Hospital (CHUV),Department of Clinical Neurosciences (DNC)
[3] Ruhr-University Bochum,Department of Human Genetics
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Scientific Reports | / 8卷
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Huntington disease (HD) is an autosomal dominant neurodegenerative disorder caused by a mutation in the huntingtin (HTT) gene which results in progressive neurodegeneration in the striatum, cortex, and eventually most brain areas. Despite being a monogenic disorder, environmental factors influence HD characteristics. Both human and mouse studies suggest that mutant HTT (mHTT) leads to gene expression changes that harbor potential to be modulated by the environment. Yet, the underlying mechanisms integrating environmental cues into the gene regulatory program have remained largely unclear. To better understand gene-environment interactions in the context of mHTT, we employed RNA-seq to examine effects of maternal separation (MS) and environmental enrichment (EE) on striatal gene expression during development of BACHD rats. We integrated our results with striatal consensus modules defined on HTT-CAG length and age-dependent co-expression gene networks to relate the environmental factors with disease progression. While mHTT was the main determinant of expression changes, both MS and EE were capable of modulating these disturbances, resulting in distinctive and in several cases opposing effects of MS and EE on consensus modules. This bivalent response to maternal separation and environmental enrichment may aid in explaining their distinct effects observed on disease phenotypes in animal models of HD and related neurodegenerative disorders.
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