Short answer · Medically reviewed summary · Last updated: 2026-05-08
1p36 Deletion Syndrome is estimated to occur in approximately 1 in 5,000 to 1 in 10,000 live births, making it one of the most common terminal deletion syndromes. While it is considered a rare condition, true prevalence may be higher than recorded due to the historical challenges of detecting small chromosomal deletions. How common is 1p36 Deletion Syndrome in the population? 1p36 Deletion Syndrome is classified as a rare chromosomal disorder.
What is the prevalence of 1p36 Deletion Syndrome?
Prevalence of 1p36 Deletion Syndrome: how many people are affected worldwide, differences by sex and region, with sources.
1p36 Deletion Syndrome is estimated to occur in approximately 1 in 5,000 to 1 in 10,000 live births, making it one of the most common terminal deletion syndromes. While it is considered a rare condition, true prevalence may be higher than recorded due to the historical challenges of detecting small chromosomal deletions.
How common is 1p36 Deletion Syndrome in the population?
1p36 Deletion Syndrome is classified as a rare chromosomal disorder. Because the condition results from a microscopic deletion on the short arm of chromosome 1, many individuals remain undiagnosed or are misdiagnosed with other developmental delays until advanced genetic testing, such as chromosomal microarray analysis (CMA), is performed. Current estimates suggest the incidence is roughly 1 in 5,000 to 10,000, though these figures are subject to change as diagnostic accessibility improves globally.
Are there variations in how 1p36 Deletion Syndrome affects different groups?
Research indicates that 1p36 Deletion Syndrome affects both males and females equally, with no significant skew in gender distribution. Furthermore, there is no evidence of geographic or ethnic clusters; the syndrome appears to occur randomly across all populations. It is a lifelong condition, with symptoms presenting in early infancy, though the clinical profile of 1p36 Deletion Syndrome often evolves as patients transition from childhood into adulthood.
Why is accurate data on 1p36 Deletion Syndrome prevalence difficult to obtain?
Accurate epidemiological data for 1p36 Deletion Syndrome is hampered by several factors:
- Diagnostic hurdles: Before the widespread use of high-resolution microarrays, many cases were missed.
- Clinical variability: The size and location of the deletion on the 1p36 region vary significantly, leading to a wide spectrum of severity.
- Under-reporting: Many individuals in regions with limited access to advanced genetic diagnostics remain undiagnosed.
How does the DiseaseMaps.org community contribute to our understanding?
While formal medical registries provide the statistical foundation, real-world data is essential. Currently, 22 people with 1p36 Deletion Syndrome have joined the DiseaseMaps.org community. These lived experiences help researchers understand the daily challenges, symptom progression, and quality of life for those living with 1p36 Deletion Syndrome in ways that clinical data alone cannot capture.
Next steps
- Consult with a clinical geneticist to discuss diagnostic testing or confirmation.
- Connect with the 1p36 Deletion Support & Awareness group for peer support.
- Review your clinical history with a multidisciplinary team, including neurologists and developmental pediatricians.
- Join the DiseaseMaps.org community to share your journey and connect with other families.
Medical disclaimer: This information is for educational purposes only and should not replace professional medical advice, diagnosis, or treatment.
References
- Orphanet: 1p36 deletion syndrome (ORPHA:96139)
- NIH Genetic and Rare Diseases Information Center (GARD): 1p36 deletion syndrome
- OMIM (Online Mendelian Inheritance in Man): Chromosome 1p36 deletion syndrome (#607872)
- 1p36 Deletion Support & Awareness (1p36dsa.org)
