Question 1

What is L-2-hydroxyglutaric aciduria?

Accepted Answer

L-2-hydroxyglutaric aciduria is a primarily neurological condition characterized by the accumulation of L-2-hydroxyglutaric acid due to pathogenic variants in the L2HGDH gene. Affected individuals typically present in childhood with psychomotor retardation, cerebellar ataxia, seizures, and, in some cases, macrocephaly. This autosomal recessive disorder is very rare, affecting fewer than 1 in 1,000,000 people. The condition involves both cognitive and motor challenges, underscoring the impact on neurological development.

Question 2

What are the symptoms of L-2-hydroxyglutaric aciduria?

Accepted Answer

Individuals with L-2-hydroxyglutaric aciduria present with a constellation of neurological features. Prominent signs include ataxia, seizures, and intellectual disability, accompanied by leukoencephalopathy evident on brain imaging. The clinical picture also comprises psychomotor retardation and may include macrocephaly in some patients. Not all individuals experience all features, and severity varies considerably, with cognitive challenges and other neurological symptoms impacting learning and daily functioning.

Question 3

What causes L-2-hydroxyglutaric aciduria?

Accepted Answer

L-2-hydroxyglutaric aciduria is caused by pathogenic variants in the L2HGDH gene, which encodes an enzyme involved in the metabolism of L-2-hydroxyglutaric acid. Disruption of this enzyme’s function leads to the accumulation of the metabolite, particularly affecting brain tissue. The condition is inherited in an autosomal recessive pattern, meaning that an affected individual inherits two defective copies of the gene, one from each parent. This disorder is more common when parents share a common ancestor, and genetic counseling is recommended to help families understand the implications for future family planning. Associated genes include L2HGDH.

Question 4

How is L-2-hydroxyglutaric aciduria inherited?

Accepted Answer

L-2-hydroxyglutaric aciduria follows an autosomal recessive inheritance pattern. This means a child must inherit a copy of the altered gene from both parents to develop the condition. Parents who each carry one copy typically do not show symptoms.

Question 5

How rare is L-2-hydroxyglutaric aciduria?

Accepted Answer

L-2-hydroxyglutaric aciduria is classified as very rare. The estimated prevalence is approximately <1 in 1,000,000. Because rare disease data can be limited, actual numbers may differ from published estimates.

Question 6

How is L-2-hydroxyglutaric aciduria diagnosed?

Accepted Answer

Diagnosis of L-2-hydroxyglutaric aciduria is confirmed through molecular genetic testing that identifies pathogenic variants in the L2HGDH gene. In addition to genetic testing, a careful clinical evaluation is performed to assess characteristic neurological features such as leukoencephalopathy, ataxia, seizures, and intellectual disability. Given that these symptoms can overlap with those of other conditions, genetic testing is essential to establish a definitive diagnosis.

Question 7

Are there treatments for L-2-hydroxyglutaric aciduria?

Accepted Answer

Currently, management of L-2-hydroxyglutaric aciduria focuses on supportive care and symptom management, as there are no approved treatments specifically targeting this condition. Treatment is tailored to the individual's needs and typically involves a multidisciplinary team, including specialists in neurology, physical therapy, and educational support. Interventions may include therapies to improve motor function, strategies to manage seizures, and supportive educational programs to address cognitive challenges. Patients are encouraged to discuss treatment options with their healthcare team and to consider genetic counseling as part of their care plan.

Question 8

Are there clinical trials for L-2-hydroxyglutaric aciduria?

Accepted Answer

Yes, there are currently 2 active clinical trials for L-2-hydroxyglutaric aciduria registered on ClinicalTrials.gov. Clinical trials test new treatments, procedures, or approaches. Your healthcare provider can help determine if a trial might be appropriate for your situation. Visit the Treatment section of this page for more details.

Question 9

Where can I find support for L-2-hydroxyglutaric aciduria?

Accepted Answer

Patient advocacy organizations for L-2-hydroxyglutaric aciduria include Alex - The Leukodystrophy Charity. These organizations can provide information, connect you with other families, and help navigate care. Visit the Support section of this page for full details and contact information.

Question 10

What are the long-term effects of L-2-hydroxyglutaric aciduria on daily life?

Accepted Answer

L-2-hydroxyglutaric aciduria can lead to significant challenges in daily life due to its neurological effects. Individuals may experience difficulties with motor skills, learning, and managing seizures. Supportive care and therapies can help improve quality of life, but many will continue to face cognitive and motor challenges throughout their lives.

Question 11

How does L-2-hydroxyglutaric aciduria affect a child's development?

Accepted Answer

L-2-hydroxyglutaric aciduria can impact a child's development in various ways. Children may experience psychomotor retardation, which affects their ability to move and learn at the same pace as their peers. Additionally, they might have intellectual disabilities and coordination issues, which can make everyday activities more challenging.

Question 12

What kind of specialists should be involved in the care of someone with L-2-hydroxyglutaric aciduria?

Accepted Answer

Managing L-2-hydroxyglutaric aciduria typically requires a team of specialists. This team often includes neurologists who focus on the brain and nervous system, physical therapists to help with motor skills, and educational specialists to support learning. Working with a multidisciplinary team can provide comprehensive care tailored to the individual's needs.

Organ System	Phenotype Count	Example Features
Brain and nerves	11	Loss of previously acquired skills (developmental regression), Seizure, Leukoencephalopathy

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L-2-hydroxyglutaric aciduria

Overview

Clinical Presentation

Genetic Landscape

Diagnosis

Prognosis

Research Landscape

Patient Support

Patient Advocacy Groups

Medical References

External Resources

OMIM

Orphanet

GARD

Questions for Your Care Team

Questions for Your Care Team

FAQ

Frequently Asked Questions

Explore clinical features

Recent Publications

L-2-hydroxyglutaric aciduria

Overview

Clinical Presentation

Genetic Landscape

Diagnosis

Prognosis

Research Landscape

Patient Support

Patient Advocacy Groups

Medical References

External Resources

OMIM

Orphanet

GARD

Related Diseases

Questions for Your Care Team

Questions for Your Care Team

FAQ

Frequently Asked Questions

What is L-2-hydroxyglutaric aciduria?

What are the symptoms of L-2-hydroxyglutaric aciduria?

What causes L-2-hydroxyglutaric aciduria?

How is L-2-hydroxyglutaric aciduria inherited?

How rare is L-2-hydroxyglutaric aciduria?

How is L-2-hydroxyglutaric aciduria diagnosed?

Are there treatments for L-2-hydroxyglutaric aciduria?

Are there clinical trials for L-2-hydroxyglutaric aciduria?

Where can I find support for L-2-hydroxyglutaric aciduria?

What are the long-term effects of L-2-hydroxyglutaric aciduria on daily life?

How does L-2-hydroxyglutaric aciduria affect a child's development?

What kind of specialists should be involved in the care of someone with L-2-hydroxyglutaric aciduria?

Explore clinical features

Recent Publications