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Related Concept Videos

Human Genetics01:28

Human Genetics

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Human genetics provides a profound framework for understanding the interplay between genetic predispositions and human psychology. At the heart of this discipline lies the study of how genes influence physical traits, behaviors, and susceptibility to diseases. Each person carries a unique genetic code that subtly or significantly shapes their psychological and behavioral landscape.
The complex relationship between genetics and psychology is observable through common biological components such...
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Heritability01:06

Heritability

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Heritability is a statistical concept that measures the degree to which genetic differences among individuals contribute to trait variations within a population. It is a fundamental idea in genetics, often prone to misinterpretation. Heritability is expressed as a percentage, reflecting the proportion of variation in a specific trait across a population that can be linked to genetic differences. However, it's important to understand that heritability does not determine how "genetic"...
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Pleiotropy01:33

Pleiotropy

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Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
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Epistasis Analysis01:09

Epistasis Analysis

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Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
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Epistasis01:39

Epistasis

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In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
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Autism Spectrum Disorder01:19

Autism Spectrum Disorder

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Autism spectrum disorder (ASD) is a neurodevelopmental condition marked by persistent deficits in social communication and interaction alongside restrictive and repetitive behaviors or interests. ASD is sometimes accompanied by intellectual impairment.
These core symptoms manifest differently among individuals, ranging from mild to severe. The disorder's complexity extends beyond its clinical presentation, encompassing a diverse range of biological, cognitive, and sociocultural influences.
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Heterogeneity thwarts autism explanatory power: A proposal for endophenotypes.

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  • 1The College of New Jersey, Ewing Township, NJ, United States.

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Autism Spectrum Disorder (ASD) is highly heterogeneous, hindering effective treatments. This study proposes searching for transdiagnostic endophenotypes beyond current diagnostic criteria to better understand and treat autism heterogeneity.

Keywords:
DSM-5autismdiagnosisheterogeneityparadigmsubgroupstransdiagnostic

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Area of Science:

  • Neuroscience
  • Genetics
  • Clinical Psychology

Background:

  • Autism Spectrum Disorder (ASD) is characterized by significant heterogeneity, with individuals presenting diverse biological causes, symptom patterns, comorbidities, biomarkers, and gene variants.
  • Current diagnostic criteria, including the DSM-5 ASD criteria, have not successfully reduced this heterogeneity, impeding the discovery of effective treatments.
  • Existing efforts to reduce heterogeneity, such as stricter criteria or subgrouping, have proven unsuccessful, leaving autism pathophysiology largely unexplained.

Purpose of the Study:

  • To propose transdiagnostic endophenotypes as a novel approach to reduce autism heterogeneity.
  • To encourage researchers to explore autism symptoms outside the confines of the DSM-5 ASD diagnosis.
  • To identify potential candidates for transdiagnostic endophenotypes and outline a screening tool.

Main Methods:

  • Reviewing existing research on autism heterogeneity and diagnostic criteria.
  • Proposing the relaxation of diagnostic criteria to broaden the scope of phenotypic exploration.
  • Identifying potential transdiagnostic endophenotype candidates from DSM-5 criteria, research theories, and subtyping symptoms.

Main Results:

  • Autism is not a unitary biological or clinical disorder due to extensive, unexplained heterogeneity.
  • Current diagnostic frameworks have failed to adequately address or reduce this heterogeneity.
  • Transdiagnostic endophenotypes offer a promising avenue for reducing heterogeneity and advancing treatment discovery.

Conclusions:

  • Relaxing diagnostic criteria and searching for transdiagnostic endophenotypes may reduce autism heterogeneity.
  • Candidate endophenotypes can be identified from existing diagnostic criteria, theoretical concepts, and subtyping research.
  • A future screening tool incorporating symptoms from autism and other neurodevelopmental disorders is proposed.