Short answer · Medically reviewed summary · Last updated: 2026-05-08
TL;DR: DOOR syndrome is an extremely rare genetic condition caused by bi-allelic pathogenic variants in the TBC1D24 gene. It follows an autosomal recessive inheritance pattern, meaning both parents must carry a copy of the mutated gene to pass the condition to their child. What is the genetic cause of DOOR syndrome? The primary cause of DOOR syndrome is a mutation in the TBC1D24 gene, located on chromosome 16.
Which are the causes of Door Syndrome?
Causes of Door Syndrome explained: genetic and environmental factors, reviewed against medical sources, plus patient perspectives.
TL;DR: DOOR syndrome is an extremely rare genetic condition caused by bi-allelic pathogenic variants in the TBC1D24 gene. It follows an autosomal recessive inheritance pattern, meaning both parents must carry a copy of the mutated gene to pass the condition to their child.
What is the genetic cause of DOOR syndrome?
The primary cause of DOOR syndrome is a mutation in the TBC1D24 gene, located on chromosome 16. This gene is responsible for providing instructions to make a protein that plays a critical role in the development and function of neurons. In DOOR syndrome, these mutations disrupt normal brain development and cellular communication, which leads to the characteristic features of the condition: Deafness, Onychodystrophy (nail abnormalities), Osteodystrophy (bone changes), and intellectual disability (the acronym DOOR).
Is DOOR syndrome hereditary?
Yes, DOOR syndrome is an inherited condition. Because it is autosomal recessive, the risk for two carrier parents to have an affected child is 25% with each pregnancy. Unlike multifactorial diseases where environmental triggers play a major role, DOOR syndrome is strictly genetic. There are no known external environmental, autoimmune, or metabolic triggers that cause the condition; it is determined at the moment of conception.
How do researchers study the etiology of DOOR syndrome?
While the genetic link to TBC1D24 is well-established, researchers are still working to understand exactly how these specific mutations lead to the diverse range of symptoms seen in DOOR syndrome. Current research focuses on:
- Molecular pathways: Investigating how TBC1D24 mutations affect synaptic vesicle trafficking in the brain.
- Genotype-phenotype correlations: Studying why some individuals with DOOR syndrome exhibit more severe bone or nail symptoms than others.
- Model organisms: Using zebrafish and mouse models to observe how the loss of this protein affects early embryonic development.
Next steps
- Consult with a clinical geneticist to discuss genetic testing and family planning.
- Connect with the 13 members of the DOOR syndrome community at DiseaseMaps.org to share experiences and coping strategies.
- Monitor updates on the TBC1D24 gene research via the NIH Genetic and Rare Diseases (GARD) Information Center.
Medical disclaimer: This content is for informational purposes only and does not constitute medical advice, diagnosis, or treatment; always seek the advice of your physician or other qualified health provider.
References
- NIH Genetic and Rare Diseases (GARD) Information Center - DOOR Syndrome entry.
- OMIM (Online Mendelian Inheritance in Man) - Entry #220500.
- Orphanet - Rare disease database for DOOR syndrome (ORPHA:2385).
- PubMed - Clinical studies regarding TBC1D24-related disorders.
