Mapping genetic variants for cranial vault shape in humans.

Area of Science:

• Genetics
• Anthropology
• Evolutionary Biology

Background:

• Cranial vault shape in humans exhibits significant variation.
• This morphology is influenced by brain size and shape, holding clinical and evolutionary importance.
• The genetic basis of normal cranial vault shape remains largely unexplored.

Purpose of the Study:

• To investigate the genetic architecture of human cranial vault shape.
• To identify specific genes and genetic loci associated with cranial vault morphology.
• To explore conserved genetic mechanisms of craniofacial variation across species.

Main Methods:

• Conducted a genome-wide association study (GWAS) on cranial vault measures (maximum cranial width, maximum cranial length, cephalic index) in 4419 individuals.
• Utilized meta-analysis to combine GWAS results from two cohorts.
• Performed genome-wide linkage analysis in mice to validate human findings.

Main Results:

• Identified two significant loci associated with cranial vault shape: 15p11.2 for maximum cranial width and 17q11.2 for maximum cranial length.
• Observed 32 suggestive loci and identified candidate genes including NLK, MEF2A, SOX9, and SOX11.
• Validated two loci (17q11.2 and 17q25.1) associated with cranial vault size in both humans and mice.

Conclusions:

• This study provides novel insights into the genetic factors contributing to normal human cranial vault shape variation.
• Identified specific genetic loci and candidate genes offer targets for future research into craniofacial development.
• Cross-species validation in mice suggests conserved genetic pathways influencing craniofacial morphology.