What is a neurocognitive Endophenotype?

In this article, we argue for a biological approach to psychiatry based on ‘neurocognitive endophenotypes’, whereby changes in behavioural or cognitive processes are associated with discrete deficits in defined neural systems.

What does endophenotypes mean in psychology?

Endophenotypes are measurable components (e.g., neurophysiological, biochemical, neuroanatomical, cognitive or neuropsychological) that exist between the behavioral symptoms of a disease and distal genotype1.

What is the difference between phenotype and Endophenotype?

Multiple endophenotypes interact to determine the finally observable behavior, the phenotype, which might be abnormal. In this context, the phenotype refers to directly observable symptoms of a disorder (Figure ​1). The relationship between genetic and environmental risk factors, endophenotypes, and phenotype in ADHD.

What is an example of an Endophenotype?

In the case of schizophrenia, the overt symptom could be a psychosis, but the underlying phenotypes are, for example, a lack of sensory gating and a decline in working memory. Both of these traits have a clear genetic component and can thus be called endophenotypes.

Are neurocognitive disorders genetic?

Excluding depression, one-third to one-half of familial FTLD cases present an autosomal dominant inheritance pattern and up to 40% of total FTLD cases report a family history of neurodegenerative illness [65].

Is cognitive impairment disorder hereditary?

This relationship can also be due to genetic confounding. Recent genome-wide association studies (GWAS) found that the genetic components of general cognitive functions are about 20–30% heritable (Davies et al., 2016).

What is an Endophenotypic marker?

Endophenotypes are biomarkers that are genetically correlated with disease liability, can be measured in all individuals (both affected and unaffected), and that provide greater power to identify disease-related genes than does disease “yes/no” status alone (Gottesman & Gould, 2003; Glahn, Thompson, & Blangero 2007).

What does Cosegregate mean?

Listen to pronunciation. (KOH-seh-greh-GAY-shun) The transmission, together, of 2 or more genes on the same chromosome, as a result of their being in very close physical proximity to one another (i.e., linked).

What does Endophenotype mean?

Endophenotypes are biological or psychological phenomena of a disorder believed to be in the causal chain between genetic contributions to a disorder and diagnosable symptoms of psychopathology.

Are Endophenotypes biomarkers?

Biomarkers versus endophenotypes An important subtype of biomarkers are endophenotypes, which have a more restrictive definition, as outlined by Gould and Gottesman2. First, an endophenotype must segregate with illness in the general population. Second, an endophenotype must be heritable.

What are the two most frequent causes of neurocognitive disorder?

The most common cause of neurocognitive disorders is a neurodegenerative disease. Neurodegenerative diseases that can lead to the development of neurocognitive disorders include: Alzheimer’s disease. Parkinson’s disease.

What is the most common neurocognitive disorder?

Alzheimer’s disease is the most common type of major neurocognitive disorder, but it is only one of many possible causes.

What is an Endophenotype and why are brain phenotypes sometimes called Endophenotypes?

Developmental Disabilities and Metabolic Disorders Endophenotype is an epidemiological term used to connect behavioral symptoms with more well-understood structural phenotypes associated with known genetic causes or with abnormal genetic testing.

What is Cosegregation analysis?

Cosegregation analysis, measuring how often an allele and a disease are inherited together in a pedigree, is a component of the ACMG/AMP approach for assessing germline variant pathogenicity.

What is and Endophenotype in genetics?

What are the methods of endophenotype analysis?

The methods available for endophenotype analysis have advanced considerably since 1972; our current armamentarium includes neurophysiological, biochemical, endocrinological, neuroanatomical, cognitive, and neuropsychological (including configured self-report data) measures (29).

Is the endophenotype still important in psychiatric diagnosis?

Given the hopefully successful consequences of studies adopting an endophenotype strategy, psychiatric diagnosis will continue to be important in research and clinical practice. Indeed, similar to the principle we describe here, optimally reduced or partitioned phenotypes may be useful in refining the diagnostic system.

What can endophenotypes tell us about polygenic systems?

Endophenotypes provided a means for identifying the “downstream” traits or facets of clinical phenotypes, as well as the “upstream” consequences of genes and, in principle, could assist in the identification of aberrant genes in the hypothesized polygenic systems conferring vulnerabilities to disorders.

What are the risk factors for endophenotypes?

Although the exact identification of these endophenotypes is controversial, certain traits such as impulsivity and aggression are commonly cited risk factors.

https://www.youtube.com/watch?v=c6XvEsQZZFc