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 Genetjournal_title
Human molecular geneticsauthors
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 Ndoi
10.1093/hmg/ddx006subject
Has Abstractpub_date
2017-03-01 00:00:00pages
913-922issue
5eissn
0964-6906issn
1460-2083pii
3045004journal_volume
26pub_type
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