Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Endophenotype strategies for the study of neuropsychiatric disorders

16.12.2011
The identification of genes that contribute to a susceptibility to complex neuropsychiatric disorders such as schizophrenia, major depression and bipolar disorders has been not very successful using conventional genetic approach.

There are several problems associating with this conventional approach including carriers of genes cannot be identified in the absence of manifest symptoms and the heterogeneity of neuropsychiatric disorders.

A new direction that appears encouraging is the identification of neurobiological or neurobehavioural characteristics associated with these complex neuropsychiatric disorders, or endophenotypes, that may be more closely linked to gene expression. Endophenotype is a biomarker associating with genetic components as well as the clinical symptoms of neuropsychiatric disorders. It plays an important role to bridge the gap between microscopic level and macroscopic level of neuropsychiatric disorders.

The identification of endophenotype, along with the advanced genetic analysis such genomewise association studies, is very crucial to the identification of genes that predispose someone to neuropsychiatric disorders. Therefore, the study of endophenotype is of particular useful for us to understand the underlying mechanism of the illness process of neuropsychiatric disorders, aiding the clinicians to make accurate diagnosis and for early detection purposes.

With the supported from the National Basic Research Programme of China (973 Progamme) (2007CB512302), The Key Laboratory of Mental Health of the Institute of Psychology, Chinese Academy of Sciences has organized a strategic symposium for endophenotypes, titled ""Endophenotype strategy for psychotic disorders and summit meeting of Key Laboratory of Mental Health, Institute of Psychology, CAS". International renowned scholars of this field presented their updated findings on endophenotypes. Professor Irving Gottesman, the founder of the endophenotype for neuropsychiatric disorders, was also giving a video lecture to all the participants. Their work was published in the special issue of Chinese Science Bulletin, 2011, Vol. 56(32).

Cognitive deficits have been widely recognized as core features of schizophrenia, and as major contributors to the clinical outcome of the disorder. They are also studied widely as 'endophenotypes', reflecting a growing consensus that schizophrenia is a broader, more multidimensional illness than the diagnostic criteria required for its formal diagnosis. Stone and Hsi adopted this evolving view of cognition underlying its utilization in recent initiatives for intervention and assessment in schizophrenia, and illustrated it with the use of the MATRICS Cognitive Consensus Battery, a standardized battery of neuropsychological tests developed to assess the effectiveness of cognitive enhancing treatments in schizophrenia. They then further provided evidence to show the utilization of neuropsychological deficits in the identification, validation and remediation of a liability syndrome for schizophrenia ('schizotaxia'). Taken together, the inclusion of cognition in broader consortium and other collaborative efforts to assess interrelationships across multiple dimensions of function will provide important catalysts for progress in each individual dimension. Utilization of cognition underscores its functional importance in the clinical outcome of schizophrenia. Moreover, it helps to illuminate indicators of liability for schizophrenia that might be amenable to remediation.

On the other hand, Prof. Pak Sham and colleagues have addressed the statistical issues and approaches in endophenotype research. In this paper, they argued that in reality, a putative endophenotype is unlikely to be a perfect representation of the genetic component of disease liability. The magnitude of the correlation between a putative endophenotype and the genetic component of disease liability can be estimated by fitting multivariate genetic models to twin data. A number of statistical methods have been developed for incorporating endophenotypes in genetic linkage and association analyses with the aim of improving statistical power. The most recent of such methods can handle multiple endophenotypes simultaneously for the greatest increase in power. In addition to increasing statistical power, endophenotype research plays an important role in helping to understand the mechanisms which connect the associated genetic variants with disease occurrence. The causal pathways are likely to be very complicated and involve endophenotypes at multiple levels: from RNA expression profiles and patterns of protein expression, through neuronal and synaptic properties, to neurophysiological and neurocognitive function. Novel statistical approaches may be required for the analysis of the complex relationships between endophenotypes at different levels and how they converge to cause the occurrence of disease.

In the paper of Consortium for the Human Information and Neurocognitive Endophenotype (CHINE) in mainland China: An example from neurological soft signs for neuropsychiatric disorders, Chan made a strategic paper on endophenotypes and argued the need for establishing a central consortium for neuropsychiatric disorders in mainland China, namely the CHINE. The CHINE is intentionally established to pave the roadmap for neuropsychiatric disorders research. It not only identifies the biosignatures for neuropsychiatric disorders but also serves as the central databank for examining the etiologies of major complex neuropsychiatric disorders as well as serving as the main basis for corresponding treatment development. The CHINE emphasizes on two main features, i.e., the supposedly universal basic cognitive functioning such as attention, and the supposedly culturally specific social cognitive functioning such as emotion perception and expression. In this consortium, data collected highlights the genetic level (susceptibility genes associating with major neuropsychiatric disorders, neuroanatomical level (structural and functional imaging data), and behavioural level (neurocognitive function performances, social cognitive functioning, neurological and clinical manifestations). Target groups include both the clinically diagnosed patients suffering from neuropsychiatric disorders (mainly schizophrenia and bipolar disorders at the current moment, but will be extended to other clinical groups later), non-psychotic first-degree relatives of the patients, and healthy controls. Chan specifically illustrated an example of a promising endophenotype for schizophrenia, namely neurological soft signs, in detailing the steps for building the consortium. It is also noteworthy that the potential translational usage of neurological soft signs as a quick, quantifiable, sensitive and user-friendly bedside early detection and screening tool for clinical practice.

See the articles:

STONE William S & HSI Xiaolu. Recent developments in neuropsychological endophenotypes for schizophrenia: Development of the MATRICS battery, liability syndromes and the near future. Chinese Science Bulletin, 2011, 56(32), 3385-3393.

SHAM Pak Chung, CHERNY Stacey S & HALL Mei-Hua. Statistical issues and approaches in endophenotype research. Chinese Science Bulletin, 2011, 56(32), 34033408.

CHAN Raymond C K. Consortium for the Human Information and Neurocognitive Endophenotype (CHINE) in mainland China: An example from neurological soft signs for neuropsychiatric disorders. Chinese Science Bulletin, 2011, 56(32), 3409-3415.

CHAN chor-kiu Raymond | EurekAlert!
Further information:
http://www.psych.ac.cn

More articles from Health and Medicine:

nachricht Researchers identify new way to unmask melanoma cells to the immune system
17.01.2018 | Duke University Medical Center

nachricht Study advances gene therapy for glaucoma
17.01.2018 | University of Wisconsin-Madison

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Scientists decipher key principle behind reaction of metalloenzymes

So-called pre-distorted states accelerate photochemical reactions too

What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...

Im Focus: The first precise measurement of a single molecule's effective charge

For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.

Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...

Im Focus: Paradigm shift in Paris: Encouraging an holistic view of laser machining

At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.

No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...

Im Focus: Room-temperature multiferroic thin films and their properties

Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.

Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...

Im Focus: A thermometer for the oceans

Measurement of noble gases in Antarctic ice cores

The oceans are the largest global heat reservoir. As a result of man-made global warming, the temperature in the global climate system increases; around 90% of...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

10th International Symposium: “Advanced Battery Power – Kraftwerk Batterie” Münster, 10-11 April 2018

08.01.2018 | Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

 
Latest News

Gran Chaco: Biodiversity at High Risk

17.01.2018 | Ecology, The Environment and Conservation

Only an atom thick: Physicists succeed in measuring mechanical properties of 2D monolayer materials

17.01.2018 | Physics and Astronomy

Fraunhofer HHI receives AIS Technology Innovation Award 2018 for 3D Human Body Reconstruction

17.01.2018 | Awards Funding

VideoLinks
B2B-VideoLinks
More VideoLinks >>>