Researchers reported on a 17-year-old girl with a history of developmental delays and heart problems who suddenly developed psychotic symptoms—seeing or hearing things that weren't there, and struggling to distinguish reality. After investigation, doctors discovered she had 3q29 deletion syndrome, a rare genetic condition she was born with. Her psychiatric crisis had revealed what had been hidden all along.
3q29 deletion syndrome occurs when a tiny piece of DNA is missing from chromosome 3. This disrupts normal brain development, often causing developmental delays, intellectual disability, autism-like traits, and attention problems. Importantly, people with this condition face a significantly higher lifetime risk of developing psychosis or schizophrenia. The challenge is that the condition doesn't always show obvious physical signs—a child may appear typically developing while struggling quietly with neurodevelopmental challenges, until psychiatric symptoms emerge in the teenage years.
Why neurodevelopmental history matters when psychosis appears
For Singapore families, this case highlights an important pattern: when a teenager with autism, ADHD, or developmental delays suddenly develops psychotic symptoms, genetic causes deserve investigation alongside environmental factors like school stress or peer conflict. While both matter, doctors and parents may focus heavily on life stressors and miss a biological explanation. In Singapore's healthcare system, genetic testing has become more accessible, yet awareness of rare genetic conditions presenting through psychiatric symptoms remains limited. This case reminds us that the link between neurodevelopment and psychosis is real and worth exploring.
What happens when the genetic diagnosis is made
Once identified, conditions like 3q29 deletion syndrome can be managed effectively. The teenager in this case was treated with psychiatric medication and integrated into adapted education and activities tailored to her needs. Without the genetic diagnosis, she might have been treated only for psychosis, missing the fuller picture of her support needs—similar to treating a symptom rather than understanding the root. This more complete picture allows doctors and families to plan appropriate, coordinated care.
If your teen shows these signs, consider genetic evaluation
- If your teenager has known developmental delays or autism and develops psychotic symptoms, ask your doctor about genetic testing as part of the psychiatric assessment.
- Keep a record of any physical health history (heart problems, unusual development patterns) alongside psychiatric symptoms—this helps doctors see the full picture.
- Seek evaluation at a centre experienced in both child psychiatry and genetics, where specialists can collaborate on diagnosis.