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Boraxbekk CJ, Ames D, Kochan NA, Lee T, Thalamuthu A, Wen W, Armstrong NJ, Kwok JBJ, Schofield PR, Reppermund S, Wright MJ, Trollor JN, Brodaty H, Sachdev P, Mather KA. Investigating the influence of KIBRA and CLSTN2 genetic polymorphisms on cross-sectional and longitudinal measures of memory performance and hippocampal volume in older individuals. Neuropsychologia 2015; 78:10-7. [PMID: 26415670 DOI: 10.1016/j.neuropsychologia.2015.09.031] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Revised: 09/23/2015] [Accepted: 09/25/2015] [Indexed: 11/15/2022]
Abstract
The variability of episodic memory decline and hippocampal atrophy observed with increasing age may partly be explained by genetic factors. KIBRA (kidney and brain expressed protein) and CLSTN2 (calsyntenin 2) are two candidate genes previously linked to episodic memory performance and volume of the hippocampus, a key memory structure. However, whether polymorphisms in these two genes also influence age-related longitudinal memory decline and hippocampal atrophy is still unknown. Using data from two independent cohorts, the Sydney Memory and Ageing Study and the Older Australian Twins Study, we investigated whether the KIBRA and CLSTN2 genetic polymorphisms (rs17070145 and rs6439886) are associated with episodic memory performance and hippocampal volume in older adults (65-90 years at baseline). We were able to examine these polymorphisms in relation to memory and hippocampal volume using cross-sectional data and, more importantly, also using longitudinal data (2 years between testing occasions). Overall we did not find support for an association of KIBRA either alone or in combination with CLSTN2 with memory performance or hippocampal volume, nor did variation in these genes influence longitudinal memory decline or hippocampal atrophy in two cohorts of older adults.
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Affiliation(s)
- C J Boraxbekk
- CEDAR, Center for Demographic and Aging Research, Umeå University, S-901 87 Umeå, Sweden; UFBI, Umeå centre for Functional Brain Imaging, Umeå University, Sweden.
| | - David Ames
- National Ageing Research Institute, Parkville, Victoria, Australia; Department of Psychiatry, University of Melbourne, Victoria, Australia
| | - Nicole A Kochan
- Centre for Healthy Brain Ageing, UNSW Australia, Sydney, NSW, Australia; Neuropsychiatric Institute, Prince of Wales Hospital, Randwick, NSW, Australia
| | - Teresa Lee
- Centre for Healthy Brain Ageing, UNSW Australia, Sydney, NSW, Australia; Neuropsychiatric Institute, Prince of Wales Hospital, Randwick, NSW, Australia
| | | | - Wei Wen
- Centre for Healthy Brain Ageing, UNSW Australia, Sydney, NSW, Australia
| | - Nicola J Armstrong
- Centre for Healthy Brain Ageing, UNSW Australia, Sydney, NSW, Australia; Mathematics and Statistics, Murdoch University, WA, Australia
| | - John B J Kwok
- Neuroscience Research Australia, Sydney, NSW, Australia; School of Medical Sciences, UNSW, Sydney, NSW, Australia
| | - Peter R Schofield
- Neuroscience Research Australia, Sydney, NSW, Australia; School of Medical Sciences, UNSW, Sydney, NSW, Australia
| | - Simone Reppermund
- Centre for Healthy Brain Ageing, UNSW Australia, Sydney, NSW, Australia; Department of Developmental Disability Neuropsychiatry, UNSW Australia, Sydney, NSW, Australia
| | | | - Julian N Trollor
- Centre for Healthy Brain Ageing, UNSW Australia, Sydney, NSW, Australia; Department of Developmental Disability Neuropsychiatry, UNSW Australia, Sydney, NSW, Australia
| | - Henry Brodaty
- Centre for Healthy Brain Ageing, UNSW Australia, Sydney, NSW, Australia; Dementia Collaborative Research Centre, UNSW Australia, Sydney, NSW, Australia
| | - Perminder Sachdev
- Centre for Healthy Brain Ageing, UNSW Australia, Sydney, NSW, Australia; Neuropsychiatric Institute, Prince of Wales Hospital, Randwick, NSW, Australia
| | - Karen A Mather
- National Ageing Research Institute, Parkville, Victoria, Australia
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Vyas NS, Ahn K, Stahl DR, Caviston P, Simic M, Netherwood S, Puri BK, Lee Y, Aitchison KJ. Association of KIBRA rs17070145 polymorphism with episodic memory in the early stages of a human neurodevelopmental disorder. Psychiatry Res 2014; 220:37-43. [PMID: 25146696 DOI: 10.1016/j.psychres.2014.07.024] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2013] [Revised: 07/09/2014] [Accepted: 07/13/2014] [Indexed: 12/22/2022]
Abstract
A common T/C polymorphism within the ninth intron of the KIBRA gene (rs17070145) is thought to influence memory in humans. Since cognitive impairment, including memory, is a core feature of schizophrenia, we attempted to investigate this association in an independent sample of adolescent patients with early-onset schizophrenia (EOS; onset before age 18) probands and their healthy siblings. In a sample of 25 pairs of EOS proband-healthy full sibling, we sought to investigate the association of KIBRA with memory performance. Episodic memory was measured using immediate and delayed recall measures of the California Verbal Learning Test. EOS underperformed at immediate and delayed recall compared with siblings. In a combined analysis (TT vs. TC/CC) assuming a C dominant model of inheritance, we found a main effect of genotype where individuals with TT genotype outperformed non-TT-carriers at immediate and delayed recall. A genotype by group interaction showed that EOS with TT genotype did not show a memory advantage over siblings with TT or non-TT-carriers at immediate or delayed recall. Siblings with TT genotype showed enhanced immediate recall (not delayed recall) compared with non-TT-carriers. This study demonstrates an association between the KIBRA gene and episodic memory (immediate free recall) and suggests a differential effect of this genetic variant in EOS and healthy siblings.
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Affiliation(s)
- Nora S Vyas
- Kingston University London, Department of Psychology, Kingston, Surrey KT1 2EE, UK; National Institutes of Health, National Institute of Mental Health, Child Psychiatry Branch, 10 Center Drive, Bethesda, MD 20892-1600, USA; Institute of Psychiatry, King's College London, MRC SGDP Centre, SE5 8AF, UK.
| | - Kwangmi Ahn
- National Institutes of Health, National Institute of Mental Health, Child Psychiatry Branch, 10 Center Drive, Bethesda, MD 20892-1600, USA
| | - Daniel R Stahl
- NIHR Biomedical Research Centre for Mental Health and Institute of Psychiatry, King's College London, Department of Biostatistics, SE5 8AF, London, UK
| | - Paul Caviston
- North East London NHS Foundation Trust, Child and Adolescent Mental Health Services, Essex IG38XQ, UK
| | - Mima Simic
- South London and Maudsley NHS Foundation Trust, CAMHS National and Specialist Services, London SE5 8AF, UK
| | - Siobhan Netherwood
- South London and Maudsley NHS Foundation Trust, Croydon, CAMHS, CR0 1QG, UK
| | - Basant K Puri
- Imperial College London, Department of Medicine, Du Cane Road, W12 OHS, UK
| | - Yohan Lee
- Institute of Psychiatry, King's College London, MRC SGDP Centre, SE5 8AF, UK
| | - Katherine J Aitchison
- Institute of Psychiatry, King's College London, MRC SGDP Centre, SE5 8AF, UK; University of Alberta, Department of Psychiatry and Medical Genetics, Edmonton, Alberta, T6G 2E1, Canada
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54
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Wilker S, Elbert T, Papassotiropoulos A, de Quervain DJF, Kolassa IT. Response to: further support for an association between the memory-related gene WWC1 and posttraumatic stress disorder: results from the Detroit Neighborhood Health Study. Biol Psychiatry 2014; 76:e27-8. [PMID: 24947540 DOI: 10.1016/j.biopsych.2014.05.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/01/2014] [Accepted: 05/01/2014] [Indexed: 12/01/2022]
Affiliation(s)
- Sarah Wilker
- Clinical & Biological Psychology, Institute for Psychology & Education, University of Ulm, Ulm, Germany.
| | - Thomas Elbert
- Clinical Psychology & Behavioural Neuroscience, University of Konstanz, Konstanz, Germany
| | | | | | - Iris-Tatjana Kolassa
- Clinical & Biological Psychology, Institute for Psychology & Education, University of Ulm, Ulm, Germany
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