Prevention of depressive behaviour in the YAC128 mouse model of Huntington disease by mutation at residue 586 of huntingtin

• Published in: Brain (London, England : 1878) Vol. 132; no. 4; pp. 919 - 932
• Main Authors: Pouladi, Mahmoud A., Graham, Rona K., Karasinska, Joanna M., Xie, Yuanyun, Santos, Rachelle Dar, Petersén, Åsa, Hayden, Michael R.
• Format: Journal Article
• Language: English
• Published: Oxford Oxford University Press 01.04.2009; Oxford Publishing Limited (England)
• Subjects: Animals; Anxiety; Biological and medical sciences; Body Weight; CAG repeat; Clinical Medicine; Degenerative and inherited degenerative diseases of the nervous system. Leukodystrophies. Prion diseases; depression; Depression - genetics; Depression - prevention & control; Disease Models, Animal; Female; Genetic Predisposition to Disease; Huntingtin Protein; Huntington disease; Huntington Disease - genetics; Huntington Disease - physiopathology; Huntington Disease - psychology; Klinisk medicin; Male; Medical and Health Sciences; Medical sciences; Medicin och hälsovetenskap; Mice; Mice, Transgenic; mouse model; Mutation; Nerve Tissue Proteins - genetics; Neurologi; Neurology; Nuclear Proteins - genetics; Phenotype; proteolysis; Sex Factors; Swimming; Trinucleotide Repeats - genetics; depression; mouse model; CAG repeat; proteolysis; Huntington disease; Mood disorder; Animal model; Nervous system diseases; Huntingtin; Depression; Genetic disease; Cerebral disorder; Prevention; Proteolysis; Central nervous system disease; Degenerative disease; Mutation; Extrapyramidal syndrome
• ISSN: 0006-8950; 1460-2156; 1460-2156
• DOI: 10.1093/brain/awp006

Huntington disease is a neurodegenerative disorder caused by an expanded CAG repeat in the Huntington disease gene. The symptomatic phase of the disease is defined by the onset of motor symptoms. However, psychiatric disturbances, including depression, are common features of Huntington disease and recent studies indicate that depression can occur long before the manifestation of motor symptoms. The aetiology of depression in Huntington disease is not fully understood and psychosocial factors such as the knowledge of carrying a mutation for an incurable disease or adverse social circumstances may contribute to its presentation. Due to the difficulties in discriminating between social and biological factors as contributors to depression in clinical Huntington disease, we chose to assess whether a model for Huntington disease not subject to environmental stressors, namely the YAC mouse model of Huntington disease, displays a depressive phenotype. Indeed, the YAC transgenic mice recapitulate the early depressive phenotype of Huntington disease as assessed by the Porsolt forced swim test as well as the sucrose intake test as a measure of anhedonia. The YAC model mirrors clinical Huntington disease in that there were no effects of CAG repeat length or disease duration on the depressive phenotype. The depressive phenotype was completely rescued in YAC transgenic animals expressing a variant of mutant huntingtin that is resistant to cleavage at amino acid 586 suggesting that therapies aimed towards inhibition of huntingtin cleavage are also likely to have beneficial effects on this aspect of the disease. In conclusion, our study provides strong support for a primary neurobiological basis for depression in Huntington disease.