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Condition report · Psychiatric

Autism Spectrum Disorder

Whole genome sequencing identifies the specific genetic basis for autism and neurodevelopmental differences, enabling targeted intervention and family planning with precision.

A condition report looks for rare variants known to cause the conditions it covers.

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About this condition

A neurodevelopmental condition characterized by challenges in social interaction, communication, and the presence of restricted or repetitive behaviors and interests.

Autism spectrum disorder (ASD) is a neurodevelopmental condition characterized by persistent differences in social communication and interaction, along with restricted, repetitive patterns of behavior, interests, or activities. The genetic architecture is profoundly complex: heritability is estimated at 50-80%, but no single gene accounts for more than 1% of cases. Over 100 genes have been implicated, with de novo mutations playing a prominent role. Most genetic forms follow autosomal dominant inheritance, though recessive, X-linked, and polygenic models also contribute.

ASD prevalence is approximately 1 in 36 children, with males affected approximately 4:1 compared to females. The genetic landscape is highly heterogeneous across populations and ancestries; no two genetic forms of ASD are identical. Key genes like SHANK3 (involved in synaptic scaffolding), CHD8 (chromatin remodeling), and DYRK1A (neuronal cell signaling) exemplify converging biological pathways that disrupt neurodevelopment through different mechanisms.

Understanding the genetic basis of ASD transforms clinical care: it provides a definitive etiological explanation that ends the diagnostic odyssey, enables prognostic information about developmental trajectories, guides medical surveillance (many ASD-associated syndromes carry risks for epilepsy or cardiac defects), opens access to gene-specific clinical trials, and provides accurate recurrence risk for family planning. A genetic diagnosis also connects families to gene-specific support communities and research registries.

Over 100 genes contribute to autism with distinct inheritance patterns, clinical presentations, and developmental progressions; genetic subtyping is essential for prognosis and intervention planning.

The 2 conditions we analyse

Autism Spectrum Disorder

A spectrum of developmental disorders that includes autism, and Asperger syndrome. Signs and symptoms include poor communication skills, defective social interactions, and repetitive behaviors.

What a diagnosis changes

Early intervention services, behavioral therapy, speech and occupational therapy, psychopharmacology for associated features

Genes analysed

Also known as

autistic spectrum disorder; pervasive developmental disorder - not otherwise specified; pervasive developmental disorders

Includes 5 related subtypes ↓
  • autism
  • autism spectrum disorder 1
  • autism spectrum disorder 2
  • autism spectrum disorder 3
  • PAX5-related B lymphopenia and autism spectrum disorder
MONDO:0005258Orphanet 106MedGen 307153

Autism, susceptibility to (single-gene forms)

Single-gene contributions to autism, including variants in NLGN3, NLGN4X, PTCHD1, SHANK2, TBR1 and CHD8.

Genes analysed

Includes 26 related subtypes ↓
  • autism, susceptibility to, 1
  • autism, susceptibility to, 10
  • autism, susceptibility to, 11
  • autism, susceptibility to, 12
  • autism, susceptibility to, 13
  • autism, susceptibility to, 14a
  • autism, susceptibility to, 14b
  • autism, susceptibility to, 15
  • autism, susceptibility to, 16
  • autism, susceptibility to, 17
  • autism, susceptibility to, 19
  • autism, susceptibility to, 20
  • autism, susceptibility to, 3
  • autism, susceptibility to, 4
  • autism, susceptibility to, 6
  • autism, susceptibility to, 7
  • autism, susceptibility to, 8
  • autism, susceptibility to, 9
  • autism, susceptibility to, X-linked 1
  • autism, susceptibility to, X-linked 2
  • autism, susceptibility to, X-linked 3
  • autism, susceptibility to, X-linked 4
  • autism, susceptibility to, X-linked 5
  • epsilon-trimethyllysine hydroxylase deficiency
  • intellectual developmental disorder with autism and macrocephaly
  • intellectual developmental disorder with autism and speech delay
MONDO:0020836

Why whole genome sequencing

Chromosomal microarray detects only 10-15% of genetic causes. Even comprehensive panels identify only 5-15%; whole genome sequencing reaches 40-50%.

Standard panels cannot capture genetic diversity in autism

ASD genetic testing faces a unique challenge: extreme genetic heterogeneity across over 100 implicated genes. Targeted gene panels vary enormously in size but no single panel can capture all causative genes, novel candidate genes, or complex structural variants (inversions, translocations, repeat expansions) that contribute to autism. Whole genome sequencing reads every gene across the full genome, enabling detection of de novo mutations, copy number variants, and structural variants in a single test, achieving diagnostic yield of 40-50% compared to 5-15% for panels.

A genetic diagnosis enables precision intervention from early childhood

When a genetic cause is identified, it transforms management: specific developmental trajectories inform realistic expectations and intervention goals; knowledge of associated medical risks (epilepsy, cardiac defects, growth abnormalities) enables targeted medical surveillance; some gene-specific findings are now eligible for emerging gene-targeted therapies in clinical trials; and family members can be tested to determine if they carry the same variant. The answer connects families to gene-specific research networks and support communities that accelerate understanding of prognosis and optimal care.

Other psychiatric conditions

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