Familial schizencephaly associated with EMX2 mutation

Area of Science:

• Neuroscience
• Genetics
• Developmental Biology

Background:

• Schizencephaly is a severe congenital brain malformation characterized by a cleft in the cerebral hemispheres.
• The genetic underpinnings of schizencephaly are not fully understood, though several candidate genes have been proposed.

Observation:

• Two brothers, aged 8 and 10, presented with severe bilateral schizencephaly and significant neurological deficits.
• Both siblings harbored an identical point mutation in the homeobox gene EMX2.
• Clinical presentation and the anatomical extent of brain malformations varied between the two affected brothers.

Findings:

• The identical EMX2 mutation in both affected individuals strongly implicates this gene in the etiology of schizencephaly.
• The differing clinical severity and morphologic features suggest that modifier genes or environmental factors play a role in disease presentation.

Implications:

• This study supports the hypothesis that mutations in the EMX2 gene are a causative factor in some cases of schizencephaly.
• Further research into genetic and environmental modifiers is warranted to fully understand the spectrum of schizencephaly.
• Understanding the genetic basis of schizencephaly can aid in genetic counseling and potentially inform future therapeutic strategies.