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Cited by 712Autism Spectrum Disorder ResearchGenetics and Neurodevelopmental DisordersWilliams Syndrome Research

Genetics of autism spectrum disorders

Open access
Geschwind, Daniel H.·2011·Trends in Cognitive Sciences
DOI 10.1016/j.tics.2011.07.003PMC PMC3691066
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Abstract

Characterized by a combination of abnormalities in language, social cognition, and mental flexibility, autism is not a single disorder, but a neurodevelopmental syndrome commonly referred to as autism spectrum disorder (ASD). Several dozen ASD susceptibility genes have been identified in the past decade, collectively accounting for 10–20% of ASD cases. These findings, while demonstrating that ASD is etiologically heterogeneous, provide important clues about its pathophysiology. Diverse genetic and genomic approaches provide evidence converging on disruption of key biological pathways, many of which are also implicated in other allied neurodevelopmental disorders. Knowing the genes involved in ASD provides us with a crucial tool to probe both the specificity of ASD and the shared neurobiological and cognitive features across what are considered clinically distinct disorders, with the goal of linking gene to brain circuits to cognitive function.

AI snapshot

Written from the paper’s full text.

TL;DR

This review argues that autism spectrum disorder is highly genetically heterogeneous, with rare and common variants converging on neurodevelopmental pathways and brain connectivity. It synthesizes evidence that known susceptibility genes explain only a minority of cases and that most variants are not specific to ASD.

Key findings

  • Known ASD susceptibility genes collectively account for 10–20% of cases; no single gene explains more than 1–2%, and individual syndromic causes each account for less than 1%.
  • Twin and family studies support a strong genetic contribution, with heritability estimates around 70–80%, although one recent twin study emphasized shared environment; first-degree relatives often show subthreshold autistic traits.
  • Rare copy number variants explain up to 10% of idiopathic ASD, and de novo CNVs appear in 5–10% of probands versus 1–2% of unaffected controls, with variable penetrance and pleiotropy (e.g., 16p11, NRXN1).
  • Convergent findings implicate synaptic, cell-adhesion, GTPase/cytoskeleton, RNA splicing, immune/inflammatory, and connectivity pathways; CNTNAP2 variants link language and fronto-prefrontal connectivity in ASD and typical individuals.

Methods

  • Narrative review, not a primary study; it synthesizes twin/family studies, rare variant and CNV analyses, genome-wide association studies, post-mortem brain expression, protein interactome, and imaging-genetic findings.
  • Discusses diagnostic evolution, complex genetics models, rare versus common variation, endophenotypes, and pathway convergence.
  • No systematic search strategy or meta-analysis is described.

Limitations

  • The paper states the field is at an early juncture; common variant evidence is sparse and not independently replicated; pathway annotation and multi-gene CNV content limit enrichment analyses; gene–gene, gene–environment, and epigenetic interactions remain underexplored.
  • The paper notes that ASD heterogeneity and pleiotropy complicate specificity, and many mutations show less than 50% penetrance and cross-disorder effects.
  • Evident from the text: as a review, it provides no new empirical data or formal bias assessment, and its conclusions depend on the cited literature and available cohorts and methods.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.1016/j.tics.2011.07.003

Cites

127 of 127 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

0 of 90 cited sources checked · 0 supported · 0 flagged

  • Interpretationreasoning

    The difference in frequency of rare de novo CNV between simplex and multiplex families suggests that different types of genetic variation may contribute differently to simplex and multiplex autism.

    “This difference in the frequency of rare de novo CNV in families with different structures (simplex vs. multiplex) suggests that the contribution from different types of genetic variation between simplex and multiplex autism may differ.”
    Quote in the paperSubstantial claim
  • Premisecitation

    The frequency of de novo mutations is significantly lower in multiplex familial autism cases than in simplex families.

    “Second, the frequency of de novo mutations is significantly lower in multiplex (familial) cases of autism versus those with only one affected proband, so called simplex families [30, 31, 34].”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites [30] Sebat J 2007 Strong association of de novo copy number mutations with autism Science 316 445 449 17363630 PMC2993504 source

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    • cites [31] Marshall CR 2008 Structural variation of chromosomes in autism spectrum disorder Am J Hum Genet 82 477 488 18252227 PMC2426913 source

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    • cites [34] Levy D 2011 Rare de novo and transmitted copy-number variation in autistic spectrum disorders Neuron 70 886 897 21658582 source

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  • Interpretationreasoning

    Findings of many rare, recurrent, and non-recurrent mutations that lead to ASD challenge the idea that autism is mainly caused by combinations of common variants.

    “A series of important findings over the last four years clearly challenges the notion that autism is mainly caused by combinations of common variants by identifying a large number of rare, recurrent, and non-recurrent mutations that lead to ASD.”
    Quote in the paperSubstantial claim
  • Interpretationreasoning

    Some CNV may act as complex genetic risk factors with intermediate effects and variable penetrance and expressivity.

    “From this perspective, some CNV may be acting as complex genetic risk factors, with intermediate effect sizes, and variable penetrance and expressivity.”
    Quote in the paperSubstantial claim
  • Premisecitation

    Language delay occurs in a significant proportion of non-autistic siblings of autistic probands.

    “For example, language delay is observed in a significant proportion of non-autistic siblings of autistic probands [18, 19].”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites [18] Gamliel I 2007 The development of young siblings of children with autism from 4 to 54 months J Autism Dev Disord 37 171 183 17203244 source

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    • cites [19] Ben-Yizhak N 2011 Pragmatic language and school related linguistic abilities in siblings of children with autism J Autism Dev Disord 41 750 760 20844942 PMC3094531 source

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  • May combine two claims. 40
  • Classified as probably not a substantial claim. 4

  • May combine two claims.

    Premisecitation

    Twin studies by Rutter and Folstein showed genetic susceptibility to autism and provided strong evidence for its biological origins.

    “A major change in perspective came with the pioneering twin studies of Rutter and Folstein that demonstrated a genetic susceptibility to the disorder, providing incontrovertible evidence as to its biological origins [2, 3].”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites [2] Folstein S Rutter M 1977 Infantile autism: a genetic study of 21 twin pairs J Child Psychol Psychiatry 18 297 321 562353 source

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    • cites [3] Folstein S Rutter M 1977 Genetic influences and infantile autism Nature 265 726 728 558516 source

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  • May combine two claims.

    Premisenone given

    Several dozen genes that increase susceptibility to ASD have been found, and together they explain 10-20% of ASD cases.

    “Several dozen ASD susceptibility genes have been identified in the past decade, collectively accounting for 10–20% of ASD cases.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Premisecitation

    First-degree relatives of autistic probands have a markedly higher risk of autism than the general population, consistent with a strong familial or genetic effect.

    “studies in families show that first-degree relatives of autistic probands have a markedly increased risk for autism relative to the population, consistent with a strong familial, or genetic, effect observed in twins [12].”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [12] Bolton P 1994 A case-control family history study of autism J Child Psychol Psychiatry 35 877 900 7962246 source

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  • May combine two claims.

    Premisecitation

    None of the syndromic forms of autism account for more than 1% of ASD cases, and most are much less common.

    “none account for more than 1% of ASD cases, and most are far less common [27].”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [27] Abrahams BS Geschwind DH 2008 Advances in autism genetics: on the threshold of a new neurobiology Nat Rev Genet 9 341 355 18414403 PMC2756414 source

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  • May combine two claims.

    Premisecitation

    Autistic-like social impairment is heritable and is increased in unaffected parents and children of autistic probands.

    “Similarly, autistic-like social impairment clearly is heritable [20] and increased in unaffected parents and children of autistic probands [21].”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [20] Constantino JN Todd RD 2005 Intergenerational transmission of subthreshold autistic traits in the general population Biol Psychiatry 57 655 660 15780853 source

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    • cites [21] Constantino JN 2006 Autistic social impairment in the siblings of children with pervasive developmental disorders Am J Psychiatry 163 294 296 16449484 source

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  • May combine two claims.

    Premisecitation

    Specific genetic factors contribute to the development and function of specific brain structures, and distinct brain circuits may underlie different components of autism.

    “This is consistent with the knowledge that specific genetic factors contribute to the development and function of specific brain structures, and that distinct brain circuits may underlie different components of autism [25].”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [25] Geschwind DH 2008 Autism: many genes, common pathways? Cell 135 391 395 18984147 PMC2756410 source

      Not checked in the free run.

  • May combine two claims.

    Interpretationcitation

    Not all de novo CNV are necessarily causal or fully penetrant.

    “So all such CNV are not necessarily causal or fully penetrant [36].”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [36] Bucan M 2009 Genome-wide analyses of exonic copy number variants in a family-based study point to novel autism susceptibility genes PLoS Genet 5 e1000536 19557195 PMC2695001 source

      Not checked in the free run.

  • May combine two claims.

    Interpretationreasoning

    Different features of autism form a quantitative continuum of function that may be inherited in distinct patterns.

    “On aggregate, these data suggest that different features of autism represent a quantitative continuum of function that may be inherited in distinct patterns.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Premisecitation

    In every twin study of ASD, monozygotic twins show higher co-occurrence than dizygotic twins, consistent with heritability estimates around 70-80%.

    “This is what is observed in every twin study in ASD, overall consistent with heritability estimates of about 70–80% [8, 9].”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [8] Bailey A 1995 Autism as a strongly genetic disorder: evidence from a British twin study Psychol Med 25 63 77 7792363 source

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    • cites [9] Rosenberg RE 2009 Characteristics and concordance of autism spectrum disorders among 277 twin pairs Arch Pediatr Adolesc Med 163 907 914 19805709 source

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  • May combine two claims.

    Premisereasoning

    Under the complex genetic model, specific common variants increase susceptibility to ASD but are not individually sufficient to cause it.

    “In contrast to Mendelian genetics, under the complex genetic model, specific common variants in genes increase susceptibility to ASD, but each is not on its own sufficient to be causal (Figure 1).”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Premisecitation

    Dozens of genetic syndromes, including Joubert Syndrome, Smith Lemli Opitz, Tuberous Sclerosis, and Fragile X, cause autism, many with penetrance below 50%.

    “Dozens of genetic syndromes including Joubert Syndrome, Smith Lemli Opitz, Tuberous Sclerosis, and Fragile X are known to cause autism, although many with less than 50% penetrance [26, 27].”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites [26] Gillberg C Coleman M 1985 The Biology of the Autistic Syndromes Greenwood Publishing Group Incorporated

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    • cites [27] Abrahams BS Geschwind DH 2008 Advances in autism genetics: on the threshold of a new neurobiology Nat Rev Genet 9 341 355 18414403 PMC2756414 source

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  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Autism was thought to fit a complex genetic model in which multiple common variants of small to moderate effect interact with each other and possibly with environmental factors.

    “autism was thought to fit a model in which multiple common variants, each with small to moderate effect sizes, interact with each other and perhaps in some cases, environmental factors, to lead to autism – a situation referred to as complex genetics [27].”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [27] Abrahams BS Geschwind DH 2008 Advances in autism genetics: on the threshold of a new neurobiology Nat Rev Genet 9 341 355 18414403 PMC2756414 source

      Not checked in the free run.

  • May combine two claims.

    Premisereasoning

    Many causal CNV have large effects and are thought sufficient to cause ASD, so they are expected to reduce reproductive fitness.

    “Since many of these CNV have large effect sizes and thus are thought sufficient to cause ASD, they are predicted to significantly reduce reproductive fitness.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Premisecitation

    Whole genome association studies of common variants have found a few loci with very small effects but have not produced independently replicated results.

    “At the same time, whole genome association studies with common variants, while identifying a few loci with very small effect sizes, have not yielded independently replicated results [28, 29].”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [28] Wang K 2009 Common genetic variants on 5p14.1 associate with autism spectrum disorders Nature 459 528 533 19404256 PMC2943511 source

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    • cites [29] Anney R 2010 A genome-wide scan for common alleles affecting risk for autism Hum Mol Genet 19 4072 4082 20663923 PMC2947401 source

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  • May combine two claims.

    Premisecitation

    De novo CNV are found in 5-10% of ASD probands and in 1-2% of unaffected controls.

    “First, de novo CNV are observed in 5–10% of ASD probands, but they are also observed in 1–2% of unaffected controls.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [36] Bucan M 2009 Genome-wide analyses of exonic copy number variants in a family-based study point to novel autism susceptibility genes PLoS Genet 5 e1000536 19557195 PMC2695001 source

      Not checked in the free run.

  • May combine two claims.

    Premisereasoning

    The same common variants contribute to normal variation in cognition and behavior in unaffected people, but when combined in an autistic proband they cause ASD.

    “These same variants contribute to normal variation in cognition and behavior in unaffected individuals, but when mixed unfortunately as they are in the autistic proband, cause ASD.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Premisecitation

    Neurexin 1 CNV are observed in about 50% of unaffected carriers and across several neurodevelopmental disorders.

    “as well as Neurexin 1 CNV, which are observed in about 50% of unaffected carriers [36], and observed across several neurodevelopmental disorders (Table 1).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [36] Bucan M 2009 Genome-wide analyses of exonic copy number variants in a family-based study point to novel autism susceptibility genes PLoS Genet 5 e1000536 19557195 PMC2695001 source

      Not checked in the free run.

  • May combine two claims.

    Interpretationreasoning

    For genes within copy number variants, pathway enrichment analysis is especially problematic because most known pathological CNVs contain multiple genes and not all of them are expected to contribute to ASD, which can increase noise.

    “For genes identified within CNV this can be particularly problematic, as most known pathological CNV contain more than one gene and it is not expected that all genes within the CNV contribute to ASD, potentially increasing noise in this analysis.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: Most known pathological CNVs include multiple genes, and not every gene in a CNV is expected to contribute to ASD.

  • May combine two claims.

    Interpretationcitation

    Altered connectivity in developing language circuits is an early and potentially causal feature of ASD, which could not be inferred from studies of older children or adults.

    “This study is particularly important, as it shows altered connectivity in developing language circuits to be an early (and thus potentially causal) feature of the disorder, which could not be inferred from studies of older children or adults.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [54] Dinstein I 2011 Disrupted neural synchronization in toddlers with autism Neuron 70 1218 1225 21689606 PMC3119852 source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based). May combine two claims.

    Interpretationnone given

    Common variants are not causal for the disease but seem to have more subtle effects, making them harder to model in vitro or in animal models.

    “Common variants, while not causal for the disease, seem to have more subtle effects, making them harder to model in vitro or in animal models.”
    Quote in the paperNot a substantial claim

  • May combine two claims.

    Interpretationcitation

    Rare de novo CNV considered causal may have intermediate effects and variable penetrance, so they must interact with other factors.

    “For example, although rare de novo CNV are considered causal mutations, it is clear that mutations may have intermediate effect sizes and variable penetrance, as mentioned above [36, 42] so such mutations must be interacting with other factors.”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [36] Bucan M 2009 Genome-wide analyses of exonic copy number variants in a family-based study point to novel autism susceptibility genes PLoS Genet 5 e1000536 19557195 PMC2695001 source

      Not checked in the free run.

    • cites [42] Vassos E 2010 Penetrance for copy number variants associated with schizophrenia Hum Mol Genet 19 3477 3481 20587603 source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Specificity for autism spectrum disorder is a problem for common genetic variation as well as for rare Mendelian variants.

    “However, just as specificity for ASD is an issue for rare, Mendelian variants, it is also an issue for common variation [66].”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [66] State MW 2011 The erosion of phenotypic specificity in psychiatric genetics: emerging lessons from CNTNAP2 Biol Psychiatry 69 816 817 21497679 source

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  • May combine two claims.

    Premisecitation

    Many subsequent studies provide strong support for the connectivity model, including a recent study showing weak interhemispheric functional connectivity in young toddlers with ASD.

    “Since the general connectivity model was proposed, many subsequent studies provide strong supporting data, including a recent study showing weak interhemispheric functional connectivity in young toddlers with ASD [54].”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [54] Dinstein I 2011 Disrupted neural synchronization in toddlers with autism Neuron 70 1218 1225 21689606 PMC3119852 source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    The same allele that increases risk for language delay in ASD increases risk for specific language impairment and modifies language ability in the general population.

    “Several groups have demonstrated that this is indeed the case with respect to CNTNAP2 [60, 61, 63], as the same allele that increases risk for language delay in ASD, increases risk for specific language impairment (SLI) and modifies language ability in the general population.”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites [60] Whitehouse AJ 2011 CNTNAP2 variants affect early language development in the general population Genes Brain Behav 10 451 456 21310003 PMC3130139 source

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    • cites [61] Vernes SC 2008 A functional genetic link between distinct developmental language disorders N Engl J Med 359 2337 2345 18987363 PMC2756409 source

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    • cites [63] Peter B 2011 Replication of CNTNAP2 association with nonword repetition and support for FOXP2 association with timed reading and motor activities in a dyslexia family sample J Neurodev Disord 3 39 49 21484596 PMC3163991 source

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  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Interpretationreasoning

    Common risk variants may be easier to relate to particular brain phenotypes or circuits in humans.

    “However, perhaps because they are common in human populations and may have more subtle or specific effects on particular aspects of cognition and behavior, common risk variants may be easier to relate to particular brain phenotypes or circuits in humans.”
    Quote in the paperNot a substantial claim

  • May combine two claims.

    Premisecitation

    These results replicate and extend earlier composite pathway analyses of putative ASD susceptibility genes from the literature and CNV pathway analyses in AGRE and other cohorts.

    “These results replicate and extend earlier composite pathway analysis of putative ASD susceptibility genes compiled from the literature [68], and CNV pathway analysis in the Autism Genetic Resource Exchange (AGRE) and other cohorts [32, 36].”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites [68] Bill BR Geschwind DH 2009 Genetic advances in autism: heterogeneity and convergence on shared pathways Curr Opin Genet Dev 19 271 278 19477629 PMC2715429 source

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    • cites [32] Pinto D 2010 Functional impact of global rare copy number variation in autism spectrum disorders Nature 466 368 372 20531469 PMC3021798 source

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    • cites [36] Bucan M 2009 Genome-wide analyses of exonic copy number variants in a family-based study point to novel autism susceptibility genes PLoS Genet 5 e1000536 19557195 PMC2695001 source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    The value of pathway enrichment analysis depends on how well the tested genes are experimentally supported and how accurately current pathway annotations reflect reality.

    “The value of this approach depends on the level of experimental support for the specific genes tested and the degree to which current pathway annotations represent reality [25, 68].”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [25] Geschwind DH 2008 Autism: many genes, common pathways? Cell 135 391 395 18984147 PMC2756410 source

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    • cites [68] Bill BR Geschwind DH 2009 Genetic advances in autism: heterogeneity and convergence on shared pathways Curr Opin Genet Dev 19 271 278 19477629 PMC2715429 source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Few Mendelian variants cause autism alone; instead they may cause a wide variety of phenotypes with or without autism, ranging from intellectual disability, epilepsy, psychosis, and global developmental delay to neurotypical.

    “At the same time, few such variants cause autism alone, but instead may cause a wide variety of phenotypes (variable expressivity) with or without autism, ranging from intellectual disability (ID), epilepsy, psychosis, and global developmental delay to neurotypical [27, 41].”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites [27] Abrahams BS Geschwind DH 2008 Advances in autism genetics: on the threshold of a new neurobiology Nat Rev Genet 9 341 355 18414403 PMC2756414 source

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    • cites [41] Betancur C 2011 Etiological heterogeneity in autism spectrum disorders: more than 100 genetic and genomic disorders and still counting Brain Res 1380 42 77 21129364 source

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  • May combine two claims.

    Interpretationcitation

    Penetrance below 50% for ASD is seen in many Mendelian forms, including Fragile X, Joubert Syndrome, and Tuberous Sclerosis, so other genetic, epigenetic, or environmental factors must contribute to autism causation in those cases.

    “Penetrance less than 50% for ASD is also observed in many Mendelian forms of ASD, such as Fragile X, Jouberts Syndrome, and Tuberous Sclerosis, so other genetic, epigenetic, or environmental factors must be contributing to autism causation in such cases as well [27].”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [27] Abrahams BS Geschwind DH 2008 Advances in autism genetics: on the threshold of a new neurobiology Nat Rev Genet 9 341 355 18414403 PMC2756414 source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    No specific gene accounts for the majority of ASD; even the most common genetic forms account for no more than 1-2% of cases.

    “No specific gene accounts for the majority of ASD, rather, even the most common genetic forms account for not more than 1–2% of cases [27].”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [27] Abrahams BS Geschwind DH 2008 Advances in autism genetics: on the threshold of a new neurobiology Nat Rev Genet 9 341 355 18414403 PMC2756414 source

      Not checked in the free run.

  • Classified as probably not a substantial claim. May combine two claims.

    Premisecitation

    There is convergence at the level of molecular mechanisms in ASD, in addition to convergence in brain pathways.

    “Several recent studies have suggested that in addition to convergent brain pathways, that there may as well be convergence at the level of molecular mechanisms in ASD.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Interpretationcitation

    Different rare variants may act as susceptibility or strongly causal alleles and, together with common variation, contribute in differing proportions to ASD risk in individual patients.

    “Thus, different rare variants may act as either susceptibility or strongly causal alleles, and, in conjunction with common variation, may contribute in differing proportions to ASD risk in individual patients [25].”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [25] Geschwind DH 2008 Autism: many genes, common pathways? Cell 135 391 395 18984147 PMC2756410 source

      Not checked in the free run.

  • May combine two claims.

    Interpretationreasoning

    These findings offer the first strong support for both a shared genetic and an environmental/epigenetic basis for ASD and for an early developmental patterning defect.

    “These results provide the first strong evidence for both a shared genetic and an environmental/epigenetic basis for ASD and the presence of an early developmental patterning defect.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Interpretationreasoning

    Most genes, whether they act through common or rare variation, are not specific to ASD; they instead contribute variably to risk for ASD, ID, schizophrenia, SLI, epilepsy, and ADHD.

    “Few of the genes, whether contributing by common or rare variation, are specific to ASD, but instead variably contribute to genetic risk for ASD, ID, schizophrenia, SLI, epilepsy, and even attention deficit hyperactivity disorder (ADHD).”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Premisecitation

    Immune/inflammatory changes lacked a strong genetic signal, which implicates environmental or epigenetic factors instead.

    “The neuronal function genes were enriched in genetic association signals, providing evidence that these changes were causal, rather than the consequence of the disease [49], while the immune/inflammatory changes did not show a strong genetic signal, implicating environmental or epigenetic factors instead.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [49] Voineagu I 2011 Transcriptomic analysis of autistic brain reveals convergent molecular pathology Nature 474 380 384 21614001 PMC3607626 source

      Not checked in the free run.

  • May combine two claims.

    Interpretationcitation

    Numerous genes have been found for ASD, and some biologically coherent pathways connecting them are beginning to emerge.

    “Many genes have been identified for ASD and some biologically coherent functional pathways that link these genes are emerging.”
    Quote in the paperSubstantial claim

  • May combine two claims.

    Premisecitation

    Two groups of genes are dysregulated in ASD brains: one involved in neuronal function and the other in immune/inflammatory responses.

    “This included disruption of the normal gene expression pattern that differentiates frontal and temporal lobes (consistent with an early developmental patterning defect), and two groups of genes dysregulated in ASD brains: one related to neuronal function, and the other to immune/inflammatory responses [49].”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [49] Voineagu I 2011 Transcriptomic analysis of autistic brain reveals convergent molecular pathology Nature 474 380 384 21614001 PMC3607626 source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Genes involved in neuronal function showed enrichment in genetic association signals, which provides evidence that these changes are causal rather than a consequence of the disease.

    “The neuronal function genes were enriched in genetic association signals, providing evidence that these changes were causal, rather than the consequence of the disease [49], while the immune/inflammatory changes did not show a strong genetic signal, implicating environmental or epigenetic factors instead.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [49] Voineagu I 2011 Transcriptomic analysis of autistic brain reveals convergent molecular pathology Nature 474 380 384 21614001 PMC3607626 source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    This study's biological pathways include synapse, cytoskeleton, and GTPase signaling, and they overlap remarkably with those found in the gene expression and CNV pathway studies discussed above.

    “The biological pathways identified in this study include synapse, cytoskeleton, and GTPase signaling, demonstrating a remarkable overlap with those identified by the gene expression and CNV pathway studies discussed above.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [70] Sakai Y 2011 Protein interactome reveals converging molecular pathways among autism disorders Sci Transl Med 3 86ra49 PMC3169432 21653829 source

      Not checked in the free run.

  • May combine two claims.

    Interpretationreasoning

    Finding causal genetic variants offers a starting point for a new mechanistic understanding of ASD, allowing genes to be connected to brain, cognition, and behavior.

    “Regardless of the challenges, the identification of causal genetic variants provides a starting point for a new mechanistic understanding of ASD, enabling connection of genes to brain to cognition and behavior.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: Disorders of cognition and behavior arise from dysfunction in brain circuits.

  • May combine two claims.

    Premisecitation

    The analysis found that the normal expression pattern distinguishing frontal and temporal lobes was disrupted, consistent with an early developmental patterning defect.

    “This included disruption of the normal gene expression pattern that differentiates frontal and temporal lobes (consistent with an early developmental patterning defect), and two groups of genes dysregulated in ASD brains: one related to neuronal function, and the other to immune/inflammatory responses [49].”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [49] Voineagu I 2011 Transcriptomic analysis of autistic brain reveals convergent molecular pathology Nature 474 380 384 21614001 PMC3607626 source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Only a few elements of integrating these levels of understanding have been achieved so far, and only preliminarily.

    “Components of this have been achieved in a preliminary manner for only a few elements, but to understand ASD from a systems level mechanistic perspective, we will need to integrate all of these levels of understanding [71].”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [71] Geschwind DH Konopka G 2009 Neuroscience in the era of functional genomics and systems biology Nature 461 908 915 19829370 PMC3645852 source

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    • Rests on an assumption: These circuits are linked to particular features of higher human cognition.
42 of 42

  • The paper relies on this without support.

    ASD diagnostic categories are based on observed behavior and cognition rather than on etiology.

    “These diagnoses are not based on etiology but on expert observation and assessment of behavior and cognition.”

  • The paper relies on this without support.

    The DSM-V change removing Asperger syndrome and modifying autism criteria is based on expert clinical consensus rather than known similarities or differences in causation between the clinically defined categories.

    “This change in diagnostic criteria is not based on known similarities or differences in causation between these clinically defined categories, but rather on the consensus opinions of expert clinicians.”

  • The paper relies on this without support.

    Discovering phenotypes and linking core ASD-related endophenotypes to one another and to specific brain circuits in ASD and related neurodevelopmental disorders is still a key but under-explored area.

    “Phenotype discovery and the relationship of core ASD-related endophentoypes to each other and specific brain circuits in patients with ASD and related neurodevelopmental disorders remains a key, but under-explored area.”

  • The paper relies on this without support.

    Disorders of cognition and behavior arise from dysfunction in brain circuits.

    “Diseases of cognition and behavior have their basis in brain circuit dysfunction.”

  • The paper relies on this without support.

    These circuits are linked to particular features of higher human cognition.

    “Additionally, such circuits are related to specific aspects of human higher cognition and a more detailed notion of the autism cognitive phenotype is required.”

  • The paper relies on this without support.

    Most known pathological CNVs include multiple genes, and not every gene in a CNV is expected to contribute to ASD.

    “For genes identified within CNV this can be particularly problematic, as most known pathological CNV contain more than one gene and it is not expected that all genes within the CNV contribute to ASD, potentially increasing noise in this analysis.”
6 of 6

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Authors
Geschwind, D. H.
Affiliations
University of California, Los Angeles (US)
Corresponding author
Geschwind, Daniel H.
ORCID
Geschwind, Daniel H.
Venue
Trends in Cognitive Sciences
Publisher
Elsevier BV
Published
2011-09
Volume
15
Issue
9
Pages
409-416
ISSN
1364-6613 (ISSN-L)
DOI
10.1016/j.tics.2011.07.003
PMC
PMC3691066
OpenAlex
W2047143817
Semantic Scholar
8b3a686528400a9253d696d2782b89c3757dea9a
Cited by
696
References
130
Citations by year
2026: 23 · 2025: 30 · 2024: 37 · 2023: 50 · 2022: 32 · 2021: 37 · 2020: 51 · 2019: 55 · 2018: 48 · 2017: 35 · 2016: 59 · 2015: 49 · 2014: 67 · 2013: 61 · 2012: 48
FWCI
4.95
Type
journal article
Language
en
Open access
Licence
www.elsevier.com/tdm/userlicense/1.0/ (tdm)
Locations
  • Trends in Cognitive Sciences (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institute of Mental Health (R01MH081754, 4R37MH060233-1, R37MH060233)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (P50HD055784)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Autism Spectrum Disorder Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
  • Life Sciences › Neuroscience › Developmental Neuroscience › Williams Syndrome Research
Keywords
autism spectrum disorder, genetic etiology, neurodevelopmental disorders, gene-gene interaction, biological pathways, social cognition, language abnormalities, cognitive flexibility
MeSH terms
Child, Child Development Disorders, Pervasive, Humans, Models, Biological, Genetic Variation, Genetic Predisposition to Disease, Genome-Wide Association Study

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Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Claims read by deepseek-v4.1-flash under definition version 3 (extract-v3) on 2026-10-06.

Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-10-06.

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