Previous studies of X-monosomic women with Turner syndrome suggest a genetic association with facial fear recognition abilities at Xp11.3, specifically at a single nucleotide polymorphism (SNP rs7055196) within the EFHC2 gene.
A recent study by these same workers found evidence for association of a SNP in the EFHC2 gene, rs7055196, within this interval with fear recognition in 45,X TS.