High resolution time-course mapping of early transcriptomic, molecular and cellular phenotypes in Huntington's disease CAG knock-in mice across multiple genetic backgrounds.

Abstract:

:Huntington's disease is a dominantly inherited neurodegenerative disease caused by the expansion of a CAG repeat in the HTT gene. In addition to the length of the CAG expansion, factors such as genetic background have been shown to contribute to the age at onset of neurological symptoms. A central challenge in understanding the disease progression that leads from the HD mutation to massive cell death in the striatum is the ability to characterize the subtle and early functional consequences of the CAG expansion longitudinally. We used dense time course sampling between 4 and 20 postnatal weeks to characterize early transcriptomic, molecular and cellular phenotypes in the striatum of six distinct knock-in mouse models of the HD mutation. We studied the effects of the HttQ111 allele on the C57BL/6J, CD-1, FVB/NCr1, and 129S2/SvPasCrl genetic backgrounds, and of two additional alleles, HttQ92 and HttQ50, on the C57BL/6J background. We describe the emergence of a transcriptomic signature in HttQ111/+  mice involving hundreds of differentially expressed genes and changes in diverse molecular pathways. We also show that this time course spanned the onset of mutant huntingtin nuclear localization phenotypes and somatic CAG-length instability in the striatum. Genetic background strongly influenced the magnitude and age at onset of these effects. This work provides a foundation for understanding the earliest transcriptional and molecular changes contributing to HD pathogenesis.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Ament SA,Pearl JR,Grindeland A,St Claire J,Earls JC,Kovalenko M,Gillis T,Mysore J,Gusella JF,Lee JM,Kwak S,Howland D,Lee MY,Baxter D,Scherler K,Wang K,Geman D,Carroll JB,MacDonald ME,Carlson G,Wheeler VC,Price N

doi

10.1093/hmg/ddx006

subject

Has Abstract

pub_date

2017-03-01 00:00:00

pages

913-922

issue

5

eissn

0964-6906

issn

1460-2083

pii

3045004

journal_volume

26

pub_type

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