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Current advances in the understanding and treatment of mevalonate kinase deficiency
S Esposito1, B Ascolese1, L Senatore1
1Pediatric Highly Intensive Care Unit, Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Fondazione IRCCS Ca Granda Ospedale Maggiore Policlinico, Milan, Italy.
Abstract:
Mevalonate kinase deficiency (MKD) is a rare autosomal recessive autoinflammatory metabolic disease that is caused by mutations in the MVK gene. Patients with MKD typically have an early onset in infancy. MKD is characterized by recurrent episodes of high fever, abdominal distress, diffuse joint pain, and skin rashes. In a subset of patients, MKD is also associated with elevated serum immunoglobulin D (IgD) levels (hyperimmunoglobulinemia D syndrome, HIDS). The clinical phenotype of MKD varies widely and depends on the severity of the impaired mevalonate kinase activity. Complete impairment results in the severe metabolic disease, mevalonic aciduria, while a partial deficiency results in a broad spectrum of clinical presentation, including HIDS. The precise molecular mechanisms behind the elevated serum IgD levels and inflammation that occurs in MKD remain unknown. Children who exhibit symptoms of MKD should be tested for mutations in the MKD gene. However, the complexity of MKD often results in delays in its definitive diagnosis and the outcome in adult age is not completely known. Therapeutic options for MKD are based on limited data and include non-steroidal anti-inflammatory drugs, corticosteroids, and biological agents that target specific cytokine pathways. In recent years, some studies have reported promising results for new biological drugs; however, these cases have failed to achieve satisfactory remission. Therefore, further studies are needed to understand the pathogenesis of MKD and identify innovative therapeutic tools for its management.
Insights
Mevalonate kinase deficiency (MKD) is a rare metabolic disorder affecting infants, causing fever and joint pain. Genetic testing is crucial, but diagnosis and treatment remain challenging, necessitating further research.
Area of Science:
- Biochemistry
- Genetics
- Immunology
Background:
- Mevalonate kinase deficiency (MKD) is a rare, autosomal recessive autoinflammatory metabolic disease.
- Caused by mutations in the MVK gene, MKD typically presents in infancy with recurrent fever, abdominal pain, joint pain, and rashes.
- A subset of patients exhibits hyperimmunoglobulinemia D syndrome (HIDS) with elevated serum IgD levels.
Purpose of the Study:
- To summarize the current understanding of Mevalonate Kinase Deficiency (MKD).
- To highlight the diagnostic challenges and variable clinical presentations of MKD, including HIDS.
- To review current therapeutic options and emphasize the need for further research into MKD pathogenesis and treatment.
Main Methods:
- Review of existing literature on Mevalonate Kinase Deficiency (MKD).
- Analysis of clinical phenotypes and genetic mutations associated with MKD.
- Evaluation of current diagnostic approaches and therapeutic strategies.
Main Results:
- MKD presents with a wide spectrum of clinical severity, from mevalonic aciduria to HIDS, depending on MVK gene mutation impact.
- Diagnostic delays are common due to MKD's complexity, and adult outcomes are not well-defined.
- Current treatments (NSAIDs, corticosteroids, biologics) show limited efficacy, with new agents failing to achieve satisfactory remission.
Conclusions:
- Understanding the precise molecular mechanisms of MKD, including elevated IgD and inflammation, requires further investigation.
- Genetic testing for MVK mutations is recommended for children with suspected MKD symptoms.
- Development of innovative therapeutic strategies is crucial for effective MKD management due to limitations of current treatments.
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