Association between Autism Spectrum Disorder and Cancer - a Review from the Literature

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Abstract

Introduction: Autism spectrum disorder (ASD) is neurodevelopmental polygenic disorder with strong genetic component. In adult period, it is associated with many chronic diseases including diabetes, hypertension, cardiovascular disease, and cancer. The aim of this article is to show possible connection between autism spectrum disorder and some kinds of cancers, and to show possible pathways for prevention and treatment. Methodology: The PubMed and Google Scholar databases were searched using the keywords: autism spectrum disorder, genetics, cancer, prevention and treatment. Results: Autism spectrum disorder is associated with high rates of genomic aberrations, including chromosomal rearrangements and de novo copy-number variations. Autism and cancer share 43 risk genes, suggesting that common mechanisms underlying the functions of some of these genes could conceivably be leveraged to develop therapies not just for cancer but for autism as well. Pleiotropy, whereby gene variants exert effects on multiple phenotypes, has been the source of increasing research attention with ASD and cancer. Germline loss-of-function PTEN mutations increase the rate of benign and malignant tumors and also manifest as ASD and macrocephaly. Mutations in TSC1 and TSC2 genes cause tuberous sclerosis complex which is characterized by cortical tubers, and neurocognitive phenotypes including epilepsy, ASD, and intellectual disability (ID). Conclusion: There is may be an association between autism and specific forms of cancer. Further epidemiologic research in large populations is needed to elucidate the association between autism and cancer and identify explanatory factors. Approved drugs targeting oncogenic pathways might also have therapeutic value for treating autism spectrum disorder.

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Autism spectrum disorder

Catherine Lord, Jeremy Veenstra-VanderWeele, Gillian Baird … (2018)

Autism spectrum disorder is a term used to describe a constellation of early-appearing social communication deficits and repetitive sensory–motor behaviours associated with a strong genetic component as well as other causes. The outlook for many individuals with autism spectrum disorder today is brighter than it was 50 years ago; more people with the condition are able to speak, read, and live in the community rather than in institutions, and some will be largely free from symptoms of the disorder by adulthood. Nevertheless, most individuals will not work full-time or live independently. Genetics and neuroscience have identified intriguing patterns of risk, but without much practical benefit yet. Considerable work is still needed to understand how and when behavioural and medical treatments can be effective, and for which children, including those with substantial comorbidities. It is also important to implement what we already know and develop services for adults with autism spectrum disorder. Clinicians can make a difference by providing timely and individualised help to families navigating referrals and access to community support systems, by providing accurate information despite often unfiltered media input, and by anticipating transitions such as family changes and school entry and leaving.

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Mapping autism risk loci using genetic linkage and chromosomal rearrangements.

Peter Szatmari, Andrew Paterson, Lonnie Zwaigenbaum … (2007)

Autism spectrum disorders (ASDs) are common, heritable neurodevelopmental conditions. The genetic architecture of ASDs is complex, requiring large samples to overcome heterogeneity. Here we broaden coverage and sample size relative to other studies of ASDs by using Affymetrix 10K SNP arrays and 1,181 [corrected] families with at least two affected individuals, performing the largest linkage scan to date while also analyzing copy number variation in these families. Linkage and copy number variation analyses implicate chromosome 11p12-p13 and neurexins, respectively, among other candidate loci. Neurexins team with previously implicated neuroligins for glutamatergic synaptogenesis, highlighting glutamate-related genes as promising candidates for contributing to ASDs.

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Somatic mutation in cancer and normal cells.

Inigo Martincorena, Peter Campbell (2015)

Spontaneously occurring mutations accumulate in somatic cells throughout a person's lifetime. The majority of these mutations do not have a noticeable effect, but some can alter key cellular functions. Early somatic mutations can cause developmental disorders, whereas the progressive accumulation of mutations throughout life can lead to cancer and contribute to aging. Genome sequencing has revolutionized our understanding of somatic mutation in cancer, providing a detailed view of the mutational processes and genes that drive cancer. Yet, fundamental gaps remain in our knowledge of how normal cells evolve into cancer cells. We briefly summarize a number of the lessons learned over 5 years of cancer genome sequencing and discuss their implications for our understanding of cancer progression and aging.