Short answer · Medically reviewed summary · Last updated: 2026-05-08
Cyclic Neutropenia is primarily caused by mutations in the ELANE gene, which provides instructions for making the protein neutrophil elastase. These genetic mutations lead to a periodic failure in the bone marrow's production of neutrophils, resulting in predictable 21-day cycles of low white blood cell counts. What is the genetic basis of Cyclic Neutropenia? In the vast majority of cases, Cyclic Neutropenia is an autosomal dominant disorder caused by specific variants in the ELANE gene located on chromosome 19.
Which are the causes of Cyclic Neutropenia?
Causes of Cyclic Neutropenia explained: genetic and environmental factors, reviewed against medical sources, plus patient perspectives.
Cyclic Neutropenia is primarily caused by mutations in the ELANE gene, which provides instructions for making the protein neutrophil elastase. These genetic mutations lead to a periodic failure in the bone marrow's production of neutrophils, resulting in predictable 21-day cycles of low white blood cell counts.
What is the genetic basis of Cyclic Neutropenia?
In the vast majority of cases, Cyclic Neutropenia is an autosomal dominant disorder caused by specific variants in the ELANE gene located on chromosome 19. This gene mutation causes the neutrophil elastase protein to misfold or function incorrectly, triggering a process called "unfolded protein response" in the precursor cells of the bone marrow. This stress leads to the programmed death (apoptosis) of these cells, which is why Cyclic Neutropenia manifests in repeating, predictable cycles of approximately 21 days rather than a constant deficiency.
Is Cyclic Neutropenia always inherited?
While Cyclic Neutropenia is typically inherited from an affected parent, it can also arise from a "de novo" (new) mutation in an individual with no family history of the condition. Because it follows an autosomal dominant pattern, an affected parent has a 50% chance of passing the ELANE mutation to each child. However, the severity of the disease can vary significantly even among family members carrying the same genetic variant.
Are there other factors influencing the condition?
The etiology of Cyclic Neutropenia is complex and still under active investigation by researchers. While the ELANE mutation is the central cause, clinical observations suggest the following factors play a role in the patient experience:
- Bone Marrow Dynamics: The cyclical nature suggests an underlying regulatory feedback loop defect in stem cell maturation.
- Environmental Triggers: While the cycle is genetic, secondary infections often occur during the "nadir" (the lowest point of the neutrophil count), which can exacerbate symptoms.
- Variable Expressivity: The reason some individuals experience mild symptoms while others have severe complications remains a focus of current hematological research.
Next steps
- Consult a hematologist or clinical geneticist to discuss genetic testing for the ELANE gene.
- Connect with the 25 members of the Cyclic Neutropenia community at DiseaseMaps.org to share experiences and management strategies.
- Maintain a detailed symptom diary to track your specific 21-day cycle to prepare for clinical appointments.
Medical disclaimer: This content is for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician regarding a medical condition.
References
- NIH Genetic and Rare Diseases Information Center (GARD): Cyclic Neutropenia overview.
- Orphanet: Rare disease database entry for Cyclic Neutropenia.
- OMIM (Online Mendelian Inheritance in Man): Entry #162800 regarding ELANE mutations.
- Neutropenia Support Association: Patient resources and clinical guidelines.
