Are there differences in brain morphometry between twins and unrelated singletons? A pediatric MRI study

Area of Science:

• Neuroscience
• Developmental Biology
• Human Genetics

Background:

• Twins are valuable for studying genetic and environmental influences on brain development.
• Potential differences in brain anatomy between twins and singletons may arise from increased risks of adverse prenatal/perinatal events in twins.

Purpose of the Study:

• To investigate if healthy twins, without perinatal complications, exhibit differences in brain anatomy compared to singletons.
• To determine the generalizability of twin study findings on brain development to non-twin populations.

Main Methods:

• Compared brain MRI scans of 185 healthy pediatric twins (mean age 11.0) with 167 age- and sex-matched singletons.
• Analyzed gray/white matter lobar volumes, ventricular volume, and corpus callosum area.

Main Results:

• No significant differences in measured brain structures were found between healthy twins and singletons.
• The study possessed sufficient statistical power to detect even small differences.

Conclusions:

• Healthy twins can be included in studies of typical brain development.
• Heritability findings from twin studies are applicable to non-twin populations.