Yann Quide

RESEARCHER PROFILE

Postdoctoral Research Fellow, UNSW School of Psychiatry Affiliated Scientists, NeuRA

02 9399 1866


Dr Yann Quidé is a postdoctoral researcher at the Research Unit for Schizophrenia Epidemiology, School of Psychiatry, UNSW Sydney, and affiliated scientist at Neuroscience Research Australia (NeuRA). He received international training in the neuroimaging and neurobiology of stress and trauma at McGill University (Canada) and the University of Amsterdam (the Netherlands). Yann received a PhD scholarship from the French Ministry of Higher Education and Research to complete his doctoral studies at the University François-Rabelais of Tours, France, in 2013, where he specialized in the investigation of the early onset neurobiological alterations involved in the development of post-traumatic stress disorder.

Dr Quidé has a particular interest in identifying the neurobiological underpinnings of stress and trauma in humans. He specializes in understanding the long-term effects of childhood trauma exposure on the risk of developing severe psychiatric conditions such as schizophrenia and bipolar disorder.

Projects Yann Quide is currently involved with

CURRENT PROJECTS

Childhood trauma and inflammatory markers

This project examines immune and stress response markers in association with epigenetic markers and brain structure/function in psychotic disorders.

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Childhood Trauma and Inflammatory Markers

Epigenetic and childhood trauma in psychotic and mood disorder

This project examines epigenetic (methylation) markers of childhood trauma in schizophrenia and bipolar disorder patients.

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Epigenetics and childhood trauma

Imaging Genetics in Psychosis Study

The Imaging-Genetics in Psychosis study aims to determine common stress-related pathology among schizophrenia and bipolar disorder patients, in association with shared genetic vulnerabilities, cognitive deficits, and brain phenotypes.

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Imaging Genetics in Psychosis Study

RESEARCH TEAM

LEAH GIRSHKIN PhD Student

STACY TZOUMAKIS Lecturer

NINA TEROGANOVA PhD Student

DR KRISTIN LAURENS Senior Research Scientist

JESSECA ROWLAND PhD Student

KIMBERLIE DEAN Principle Research Scientist

FELICITY HARRIS Research Officer

PROF VAUGHAN CARR Senior Principle Research Scientist

PUBLICATIONS

Effects of common GRM5 genetic variants on cognition, hippocampal volume and mGluR5 protein levels in schizophrenia.

Matosin N, Newell KA, Quidé Y, Andrews JL, Teroganova N, Green MJ, Fernandez F

GRM5 (coding for metabotropic glutamate receptor 5, mGluR5) is a promising target for the treatment of cognitive deficits in schizophrenia, but there has been little investigation of its association with cognitive and brain phenotypes within this disorder. We examined the effects of common genetic variation in GRM5 with cognitive function, hippocampal volume, and hippocampal mGluR5 protein levels in schizophrenia patients relative to healthy controls. Two independent GRM5 variants rs60954128 [C>T] and rs3824927 [G>T] were genotyped in a schizophrenia case/control cohort (n=249/261). High-resolution anatomical brain scans were available for a subset of the cohort (n=103 schizophrenia /78 control). All participants completed a standard set of neuropsychological tests. In a separate postmortem cohort (n=19 schizophrenia/20 controls), hippocampal mGluR5 protein levels were examined among individuals of different GRM5 genotypes. Schizophrenia minor allele carriers of rs60954128 had reduced right hippocampal volume relative to healthy controls of the same genotype (-12.3%); this effect was exaggerated in males with schizophrenia (-15.6%). For rs3824927, compared to major allele homozygotes, minor allele carriers with schizophrenia had lower Intelligence Quotients (IQ). Examination in hippocampal postmortem tissue showed no difference in mGluR5 protein expression according to genotype for either rs60954128 or rs3824927. While these genetic variants in GRM5 were associated with cognitive impairments and right hippocampal volume reduction in schizophrenia, they did not affect protein expression. Further study of these mechanisms may help to delineate new targets for the treatment of cognitive deficits in schizophrenia, and may be relevant to other disorders.

Effects of childhood trauma on working memory in affective and non-affective psychotic disorders.

Quidé Y, O'Reilly N, Rowland JE, Carr VJ, Elzinga BM, Green MJ

Childhood trauma-related alterations in brain function during a Theory-of-Mind task in schizophrenia.

Quidé Y, Ong XH, Mohnke S, Schnell K, Walter H, Carr VJ, Green MJ

Childhood trauma is a risk factor for schizophrenia that affects brain functions associated with higher cognitive processes, including social cognition. Alterations in Theory-of-Mind (ToM), or mentalizing skills, are a hallmark feature of schizophrenia, and are also evident in individuals exposed to childhood trauma. However, the impact of childhood trauma exposure on brain function during social cognition in schizophrenia remains unclear. We thus examined the association between childhood trauma and brain function during the performance of a ToM task in 47 patients diagnosed with schizophrenia or schizoaffective disorder. All participants completed the Childhood Trauma Questionnaire (CTQ) and underwent functional magnetic resonance imaging while performing an established visual-cartoon affective ToM task. Whole-brain multiple regression analysis was performed on ToM-related brain activation, with CTQ total score as regressor of interest, while accounting for the effects of age, sex, diagnosis, symptom severity, behavioural performance, intelligence and medications levels. First, using a small-volume correction approach within a mask made of key regions for ToM [including bilateral temporo-parietal junctions (TPJ), medial prefrontal cortex (mPFC) and posterior cingulate cortex (PCC)/precuneus], total CTQ scores were positively associated with activation of the PCC/precuneus. Second, exploratory analyses for the rest of the brain (i.e., ROIs masked-out), revealed a positive association between trauma exposure and activation of the dorsomedial prefrontal cortex (dmPFC), and a negative association with activation of the anterior section of the TPJ. These results suggest that childhood trauma exposure may, at least partially, contribute to functional alterations of brain regions essential for effective mental state inference in schizophrenia.

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