X-linked Leigh's syndrome.

Area of Science:

• Neurology
• Genetics
• Pediatrics

Background:

• Leigh's syndrome is a rare, severe neurologic disorder affecting infants and young children.
• Subacute necrotizing encephalomyelopathy is the neuropathologic hallmark of Leigh's syndrome.
• The genetic basis of Leigh's syndrome is heterogeneous, with both mitochondrial and nuclear gene mutations identified.

Observation:

• Two male half-siblings presented with rapid neurologic decline in early childhood.
• Autopsy revealed neuropathologic features consistent with subacute necrotizing encephalomyelopathy.
• The patients lacked metabolic acidosis, a common finding in some forms of Leigh's syndrome.

Findings:

• The occurrence in half-siblings with different fathers suggested potential X-linked inheritance.
• Literature review indicated an elevated male-to-female ratio (1.83:1) and excess male-male sibling pairs in Leigh's syndrome.
• These familial and statistical patterns support the hypothesis of an X-linked form of Leigh's syndrome.

Implications:

• An X-linked inheritance pattern could explain the observed sex bias in Leigh's syndrome.
• This genetic model may also account for the clinical and biochemical variability seen in patients.
• Further research into X-linked Leigh's syndrome is warranted to understand its specific genetic mechanisms and clinical spectrum.