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Related Concept Videos

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.
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During meiosis, chromosomes occasionally separate improperly. This occurs due to failure of homologous chromosome separation during meiosis I or failed sister chromatid separation during meiosis II. In some species, notably plants, nondisjunction can result in an organism with an entire additional set of chromosomes, which is called polyploidy. In humans, nondisjunction can occur during male or female gametogenesis and the resulting gametes possess one too many or one too few chromosomes.
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Nondisjunction01:21

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Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers.  Nondisjunction is common during anaphase I or anaphase II of meiosis.  Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold...
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Updated: Mar 23, 2026

Author Spotlight: Exploring Autism Spectrum Disorder Symptoms in Fruit Flies — Genetic Models and Behavioral Tests
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Autism and chromosome abnormalities-A review.

Anne Bergbaum1, Caroline Mackie Ogilvie2,3

  • 1Genetics Laboratories, Viapath, Guy's Hospital, London, United Kingdom.

Clinical Anatomy (New York, N.Y.)
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Summary

Autism spectrum disorders (ASDs) have a genetic basis, supported by decades of research. Advances in genetic analysis reveal common chromosome abnormalities associated with ASDs, furthering our understanding of their biological origins.

Keywords:
CNVLCRautismchromosomedeletionduplication

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Area of Science:

  • Genetics
  • Neuroscience
  • Developmental Biology

Background:

  • Autism spectrum disorders (ASDs) are neuro-behavioral conditions with a predicted biological basis since their initial description.
  • Genetic investigations, especially in pediatric development, have increasingly focused on the biological underpinnings of ASDs.
  • Despite progress, a complete understanding of the biological basis of ASDs remains elusive.

Purpose of the Study:

  • To review evidence supporting a genetic basis for ASDs.
  • To provide a historical overview of genetic analysis tool development over the past 50 years.
  • To highlight common chromosomal abnormalities associated with ASDs.

Main Methods:

  • Review of historical genetic studies and clinical observations.
  • Analysis of data from karyotyping and in situ hybridization.
  • Examination of findings from array comparative genome hybridization (aCGH) for detecting smaller genetic imbalances.

Main Results:

  • Early chromosomal abnormality detection (karyotyping) indicated a link between genetic anomalies and ASDs.
  • Higher resolution techniques like aCGH identified smaller genetic imbalances, now recognized as autism susceptibility loci.
  • Specific chromosomal abnormalities are frequently observed in individuals with ASDs.

Conclusions:

  • ASDs are confirmed to have a significant genetic component.
  • Technological advancements in genetic analysis have been crucial in uncovering the genetic basis of ASDs.
  • Continued genetic research is essential for a comprehensive understanding of autism's biological etiology.