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Which chromosomal deletion syndromes include autism risk? 

Posted
Updated
ByMy Patient Advice
Author: Lucia Alvarez, MSc | Reviewed by: Dr. Rebecca Fernandez, MBBS

Several chromosomal deletion syndromes are known to increase autism risk, with one of the most widely studied being the 22q11.2 deletion syndrome. These syndromes occur when a small section of a chromosome is missing, affecting genes that are vital for brain development and function. Depending on the location and size of the deletion, individuals may experience a range of cognitive, behavioural and developmental challenges including traits associated with autism. 

The 22q11.2 deletion, also known as DiGeorge syndrome or velocardiofacial syndrome, is one of the most common microdeletions linked to increased likelihood of autism. Others include deletions on chromosomes 1p36, 16p11.2 and 17p11.2. These syndromes often affect genes involved in neural connectivity, synaptic signalling and emotional regulation, contributing to difficulties with communication, social interaction and repetitive behaviours. Understanding how chromosomal deletion syndromes relate to autism helps guide early diagnosis and opens the door to more tailored support strategies. 

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Key Deletion Syndromes Linked to Autism 

Here are two examples where chromosomal deletions contribute to autism risk: 

22q11.2 deletion 

This deletion affects multiple genes, including those important for brain structure and neurotransmitter balance. Children with this syndrome often show social challenges, anxiety and learning difficulties, with a higher-than-average chance of also meeting autism diagnostic criteria. 

16p11.2 deletion 

This region contains genes critical for brain volume and function. Its deletion has been linked not only to autism but also to language delays, intellectual disability and seizures. The wide-ranging effects make it a focus in neurodevelopmental research. 

Recognising the connection between chromosomal deletion syndromes and autism risk supports earlier assessment and personalised intervention. Visit providers like Autism Detect for personal consultations and further guidance on screening and support. 

For a deeper dive into the science, diagnosis and full treatment landscape, read our complete guide to Genetic Influences. 

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Lucia Alvarez, MSc
Author

Lucia Alvarez is a clinical psychologist with a Master’s in Clinical Psychology and extensive experience providing evidence-based therapy and psychological assessment to children, adolescents, and adults. Skilled in CBT, DBT, and other therapeutic interventions, she has worked in hospital, community, and residential care settings. Her expertise includes grief counseling, anxiety management, and resilience-building, with a strong focus on creating safe, supportive environments to improve mental well-being.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the author's privacy. 

Dr. Rebecca Fernandez, MBBS
Reviewer

Dr. Rebecca Fernandez is a UK-trained physician with an MBBS and experience in general surgery, cardiology, internal medicine, gynecology, intensive care, and emergency medicine. She has managed critically ill patients, stabilised acute trauma cases, and provided comprehensive inpatient and outpatient care. In psychiatry, Dr. Fernandez has worked with psychotic, mood, anxiety, and substance use disorders, applying evidence-based approaches such as CBT, ACT, and mindfulness-based therapies. Her skills span patient assessment, treatment planning, and the integration of digital health solutions to support mental well-being.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the reviewer's privacy. 

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