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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.
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Heritability01:06

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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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Behavior genetics explores how genetic inheritance influences human behavior. It focuses on how genes, passed from parents to offspring, contribute to the development of behavioral traits and tendencies. This branch of genetics seeks to understand the complex interplay between inherited genetic factors and environmental influences in shaping our behaviors.
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Inheritance01:25

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Gregor Mendel's pioneering work on the principles of inheritance fundamentally transformed our understanding of how traits are transmitted from generation to generation. His experiments with pea plants laid the groundwork for the discovery of genes, discrete units within organisms that control heredity.
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Updated: May 24, 2025

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[Heritability in neurodevelopmental disorders].

Jesús Eirís-Puñal1, E Monteagudo-Saavedra1

  • 1Unidad de Neuropediatría. Complejo Hospitalario Universitario. Santiago de Compostela, España.

Medicina
|February 28, 2025
PubMed
Summary
This summary is machine-generated.

Neurodevelopmental disorders (NDD) exhibit high comorbidity and heritability, yet a significant gap exists between familial and genetic heritability estimates. Understanding genetic vulnerability and mutational load is key to explaining this discrepancy in NDD research.

Keywords:
genetic and familial heritabilitygenetic vulnerabilitymissing heritabilitymutational load

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Area of Science:

  • Genetics
  • Neuroscience
  • Psychiatry

Background:

  • Neurodevelopmental disorders (NDD) are characterized by high comorbidity with psychiatric disorders and epilepsy.
  • NDD show high heritability, but a significant gap exists between familial heritability (0.66) and genetic heritability (0.19).
  • Strong genetic correlations exist between NDD and behavioral disorders, indicating a shared genetic load.

Purpose of the Study:

  • To explore the concepts of missing heritability, mutational load, and genetic vulnerability in NDD.
  • To explain the discrepancy between familial and genetic heritability figures in neurodevelopmental disorders.
  • To elucidate the complex genetic architecture underlying NDD and their comorbidities.

Main Methods:

  • Review of existing literature on neurodevelopmental disorders, heritability, and genetic correlations.
  • Analysis of concepts including missing heritability, mutational load, genetic vulnerability, and epistasis.
  • Discussion of findings from genome-wide association studies (GWAS) in relation to NDD.

Main Results:

  • A significant gap, termed 'missing heritability,' exists between familial and genetic heritability estimates for NDD.
  • Genetic vulnerability and mutational load contribute to the phenotypic expression and risk of NDD.
  • Common variants identified by GWAS explain only a small fraction of the total genetic risk for NDD.

Conclusions:

  • The discrepancy in heritability for NDD is likely due to rare variants, epigenetic factors, and complex gene-gene interactions (epistasis).
  • Understanding these complex genetic factors is crucial for comprehending the etiology of NDD and their comorbidities.
  • Further research into non-coding regions, epigenetics, and gene interactions is needed to bridge the missing heritability gap in NDD.