Heimler syndrome

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Heimler syndrome
Autosomal recessive - en.svg
Synonyms N/A
Pronounce N/A
Specialty N/A
Symptoms Sensorineural hearing loss, amelogenesis imperfecta, nail dysplasia, retinal dystrophy
Complications N/A
Onset Childhood
Duration Lifelong
Types N/A
Causes Mutations in the PEX1 or PEX6 genes
Risks
Diagnosis Genetic testing, clinical evaluation
Differential diagnosis Usher syndrome, Wolfram syndrome
Prevention N/A
Treatment Hearing aids, dental care, vision support
Medication N/A
Prognosis Variable, depending on severity of symptoms
Frequency Rare
Deaths


Heimler Syndrome

Heimler syndrome is a rare genetic disorder characterized by a combination of sensorineural hearing loss, amelogenesis imperfecta, and nail abnormalities. It is considered part of the spectrum of peroxisome biogenesis disorders (PBDs), which are caused by mutations affecting peroxisome function.

Clinical Features

Individuals with Heimler syndrome typically present with:

  • Sensorineural Hearing Loss: This type of hearing loss is due to damage to the inner ear or the nerve pathways from the inner ear to the brain. It is usually present from birth or early childhood.
  • Amelogenesis Imperfecta: A condition affecting the development of tooth enamel, leading to teeth that are discolored, prone to damage, and may have an abnormal shape.
  • Nail Abnormalities: These can include nail dystrophy, where the nails are malformed or discolored.

Genetic Basis

Heimler syndrome is caused by mutations in the PEX1 or PEX6 genes, which are involved in peroxisome biogenesis. These genes are crucial for the normal function of peroxisomes, which are cellular organelles involved in various metabolic pathways, including the breakdown of very long-chain fatty acids and the synthesis of plasmalogens.

Diagnosis

Diagnosis of Heimler syndrome is based on clinical evaluation, family history, and genetic testing. Audiological assessments, dental examinations, and genetic tests can confirm the presence of mutations in the PEX1 or PEX6 genes.

Management

Management of Heimler syndrome is symptomatic and supportive. It may include:

Related Conditions

Heimler syndrome is part of the broader group of peroxisome biogenesis disorders, which also includes Zellweger spectrum disorders. These conditions share some overlapping features but vary in severity and specific symptoms.

Research and Future Directions

Research into Heimler syndrome and related peroxisomal disorders is ongoing, with a focus on understanding the molecular mechanisms and developing potential therapies. Advances in genetic research and gene therapy hold promise for future treatment options.

NIH genetic and rare disease info

Heimler syndrome is a rare disease.

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Contributors: Prab R. Tumpati, MD