A Young Child with Recurrent Episodes of Headaches and Vision Loss: Diagnostic Clues?

Area of Science:

• Genetics
• Neurology
• Mitochondrial Diseases

Background:

• Mitochondrial Encephalopathy, Lactic Acidosis, and Stroke-like episodes (MELAS) is a maternally inherited mitochondrial disorder.
• Symptoms vary based on heteroplasmy levels and include migraines, vision loss, seizures, and stroke-like episodes.
• Diagnosis can be challenging due to variable presentation and overlapping symptoms with other neurological conditions.

Purpose of the Study:

• To present a case of a pediatric MELAS patient with initial misdiagnosis.
• To highlight the importance of considering mitochondrial disorders in children with recurrent neurological symptoms.
• To confirm the diagnosis using genetic analysis.

Main Methods:

• Clinical case presentation of an 8-year-old boy with recurrent neurological episodes.
• Review of patient history, including maternal history of similar symptoms and cerebrovascular accident.
• Mitochondrial genome sequencing to identify genetic variations.

Main Results:

• The patient experienced recurrent migrainous headaches, vomiting, and vision loss, initially suspected as neurotuberculosis.
• The patient's mother had a history of similar headaches and died from a cerebrovascular accident.
• Mitochondrial genome sequencing revealed a heteroplasmic missense variation in the MT-TL1 gene (chrM:3243A>G).

Conclusions:

• The identified MT-TL1 gene mutation confirms the diagnosis of MELAS.
• This case underscores the importance of genetic testing for mitochondrial disorders in pediatric neurology.
• Early and accurate diagnosis of MELAS is crucial for appropriate management and genetic counseling.