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Related Concept Videos

Intellectual Disability01:29

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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...
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Biological Influences on Intelligence01:30

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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...
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Human Genetics01:28

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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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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.
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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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Related Experiment Video

Updated: Aug 9, 2025

Studying Protein Function and the Role of Altered Protein Expression by Antibody Interference and Three-dimensional Reconstructions
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The Genetics of Intellectual Disability.

Sandra Jansen1, Lisenka E L M Vissers1, Bert B A de Vries1

  • 1Department of Human Genetics, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands.

Brain Sciences
|February 25, 2023
PubMed
Summary
This summary is machine-generated.

Genetic testing advancements have significantly improved diagnosing intellectual disability (ID), shifting clinical practice from a phenotype-first to a genotype-first approach. This evolution enhances diagnostic yield and reduces lengthy patient journeys.

Keywords:
geneticsgenotypeintellectual disabilitynext-generation sequencingphenotype

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Area of Science:

  • Genetics
  • Medical Diagnostics
  • Neuroscience

Background:

  • Intellectual disability (ID) affects 2-3% of the population, posing a significant societal burden.
  • Genetic factors are the primary cause of ID, but historically, diagnosis has been challenging and lengthy.
  • Technological advancements have revolutionized the detection of genetic causes for ID.

Purpose of the Study:

  • To review the evolution of genetic diagnostic technologies for intellectual disability.
  • To discuss the challenges and implications of these advancements in the field of ID.
  • To highlight the paradigm shift towards a genotype-first diagnostic approach.

Main Methods:

  • Review of historical and contemporary genetic diagnostic strategies for ID.
  • Analysis of diagnostic yields from cytogenetic analysis, genomic microarrays, and next-generation sequencing.
  • Discussion of the clinical implications of evolving genetic technologies.

Main Results:

  • Diagnostic yield for genetic causes of ID has increased substantially, from early cytogenetic methods to next-generation sequencing (up to 60%).
  • Next-generation sequencing platforms represent a major leap in diagnostic capability compared to previous methods like genomic microarrays.
  • The field is transitioning from a phenotype-first to a genotype-first diagnostic strategy.

Conclusions:

  • Advances in genetic technologies have dramatically improved the detection of genetic causes for intellectual disability.
  • The shift to a genotype-first approach streamlines diagnosis and offers significant benefits for patients and clinicians.
  • Continued innovation in genetic diagnostics is crucial for understanding and managing ID effectively.