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Related Concept Videos

Intellectual Disability01:29

Intellectual Disability

Intellectual disability (ID) is a neurodevelopmental condition characterized by deficits in intellectual and adaptive functioning that manifest during the developmental period. This condition encompasses challenges in reasoning, memory, problem-solving, and learning, accompanied by impairments in everyday life skills, such as communication, self-care, and social interactions. Intellectual disability affects approximately 1% of the population in the United States, impacting an estimated 5...
Biological Influences on Intelligence01:30

Biological Influences on Intelligence

Intelligence is often thought to be linked to brain size, but the relationship is more complex than that. While brain size does correlate modestly with some abilities, like verbal skills, the connection is weaker for others, such as spatial reasoning. Other factors, like brain structure, also play crucial roles. For instance, despite Einstein's smaller-than-average brain, his parietal cortex, which is involved in spatial reasoning, was 15% wider, suggesting that neural density might matter more...
Human Genetics01:28

Human Genetics

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...
Genomic Imprinting and Inheritance02:30

Genomic Imprinting and Inheritance

Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...
Inheritance01:25

Inheritance

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.
Each gene exists in pairs, and the combination of these genes from both parents forms an individual's genotype. This genotype is a blueprint of potential traits. Examples of genotype traits...
Behavioral Genetics and Its Designs01:23

Behavioral Genetics and Its Designs

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.
The primary methodologies used in behavior genetics include family studies, twin studies, and adoption studies, each providing unique...

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Related Experiment Video

Updated: Jul 2, 2026

Studying Protein Function and the Role of Altered Protein Expression by Antibody Interference and Three-dimensional Reconstructions
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Studying Protein Function and the Role of Altered Protein Expression by Antibody Interference and Three-dimensional Reconstructions

Published on: April 21, 2016

Genetics of intellectual disability.

H Hilger Ropers1

  • 1Max Planck Institute for Molecular Genetics, Berlin, Germany. ropers@molgen.mpg.de

Current Opinion in Genetics & Development
|August 13, 2008
PubMed
Summary

Intellectual disability (ID) is a major health challenge, often overlooked. Recent advances reveal submicroscopic chromosomal changes and autosomal gene defects as frequent causes, offering new avenues for understanding and potential treatments.

Area of Science:

  • Genetics
  • Developmental Biology
  • Medical Research

Background:

  • Early onset intellectual disability (ID) is a significant health issue, historically under-recognized and often misclassified as social or educational.
  • Severe ID cases frequently involve visible chromosomal abnormalities (e.g., trisomy 21), but submicroscopic deletions and duplications are now recognized as equally prevalent causes.

Purpose of the Study:

  • To highlight the evolving understanding of intellectual disability (ID) causes, moving beyond historical perceptions.
  • To emphasize the shift in focus towards submicroscopic chromosomal abnormalities and autosomal gene defects in ID research.
  • To underscore the heterogeneity of autosomal recessive ID (ARID) and the potential for therapeutic interventions.

Main Methods:

  • Review of current research on genetic causes of intellectual disability (ID).

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  • Analysis of diagnostic advancements, including array comparative genomic hybridization (array CGH).
  • Examination of findings from international consortia studying X-linked and autosomal forms of ID.

    • Main Results:

    • Submicroscopic chromosomal deletions and duplications are frequent, previously overlooked causes of ID.
    • Over 80 genes are implicated in X-linked ID, accounting for over 50% of affected families.
    • Autosomal forms of ID, particularly autosomal recessive ID (ARID), are highly heterogeneous with no common forms identified.

    Conclusions:

    • The genetic landscape of intellectual disability (ID) is complex, with autosomal defects being potentially more common than X-linked ones.
    • Understanding the function of ID genes is crucial for elucidating disease pathogenesis.
    • There is potential for developing drug treatments for specific genetic forms of intellectual disability.