KIF6 rs7738892: Genetics of Facial Morphology
The single nucleotide polymorphism rs7738892 is a common genetic variant located within the KIF6 gene. Large-scale genome-wide association studies have identified statistical links between this variant and subtle differences in human facial morphology, particularly forehead and upper facial contour in populations of European ancestry. Because it represents a small contributor to a complex physical trait, the evidence linking rs7738892 directly to outward appearance remains limited and polygenic in nature.
What each genotype means
Typical forehead and facial contour
You carry two copies of the C allele at rs7738892 in the KIF6 gene. In human facial morphology studies, this common genotype represents the baseline profile and is not associated with the subtle shifts in upper face or forehead contour observed with the T allele. Because evidence is currently limited to statistical associations in European cohorts, this genetic variation does not determine distinct physical traits on its own.
Carried by approximately 55% of individuals globally, making it the most common genotype across most populations.
Subtle variation in facial contour
You carry one copy of the T allele at rs7738892. Genome-wide association research in European cohorts has linked this allele to small, subtle variations in upper facial shape and forehead contour. However, this finding has limited evidence, and complex traits like facial shape are shaped by hundreds of genetic factors and environmental influences.
Carried by roughly 38% of individuals worldwide, being common across European and diverse ancestries.
Subtle variation in facial contour
You carry two copies of the T allele at rs7738892. In craniofacial genetic studies involving European populations, carrying two T alleles has been statistically linked to minor shifts in upper face and forehead morphology compared to the CC genotype. The overall evidence remains limited, and this variant represents benign, natural human physical diversity rather than any health condition.
Carried by about 7% of people globally, reflecting the less frequent nature of the homozygous T genotype.
Genetic Location and Molecular Characterization
The variant designated rs7738892 is a single nucleotide polymorphism situated on chromosome 6 within an exon of the KIF6 gene, which encodes kinesin family member 6. At this genomic position, the nucleotide can alternate between a cytosine (C) and a thymine (T). In the protein-coding sequence, rs7738892 is cataloged as a synonymous change, meaning the nucleotide alteration does not change the specified amino acid in the resulting kinesin motor protein. Despite not changing the primary protein structure, synonymous variants often reside within or near cis-regulatory motifs, splice regulatory sites, or open chromatin marks that can subtly alter transcript stability, splicing fidelity, or gene expression levels in developing tissues.
Biological Role of the KIF6 Gene
The KIF6 gene provides instructions for producing a molecular motor protein that belongs to the kinesin superfamily. Kinesins are essential cellular transporters that traverse along intracellular microtubule tracks, carrying various cargoes such as vesicles, organelles, and protein complexes. Biological models, including studies in vertebrate organisms, suggest that KIF6 participates in cilia function, ependymal flow, and structural organization during embryogenesis. Because primary and motile cilia act as critical signaling hubs for cranial neural crest cell differentiation and ventral forebrain morphogenesis, molecular pathways involving kinesin motors are plausible candidates for modulating the spatial architecture and development of the human skull and face.
Association with Normal Facial Variation
Scientific interest in rs7738892 emerged primarily from multi-cohort genome-wide association scans exploring the genetic architecture of normal-range human facial shape. Research led by consortia including VisiGen evaluated high-density three-dimensional facial landmark data across thousands of European-ancestry participants, reporting associations between rs7738892 and variations in the upper face contour and forehead shape. While the statistical signals were formally detected in large meta-analyses, facial morphology is an intricately polygenic trait shaped by hundreds of loci acting in concert with developmental and environmental cues. The effect size contributed by an individual variant like rs7738892 is extremely small, and evidence for a deterministic outcome remains categorized as limited.
Contextualizing Consumer DNA Insights
Finding your rs7738892 genotype on a raw genetic data report simply reflects common human biological diversity. This single nucleotide polymorphism is not a diagnostic marker for any craniofacial malformation or clinical condition, nor can it reliably reconstruct or predict an individual's actual face shape in isolation. Polygenic traits such as facial contours emerge from complex developmental cascades involving numerous genetic loci alongside nutritional, biomechanical, and epigenetic factors. Consequently, your genotype at this single site cannot be used for biometric prediction or personal health decisions, serving instead as a window into the subtle genetic factors guiding human morphological development.
How common is this variant?
The C allele is the predominant form globally, observed at an estimated frequency of 0.74 in gnomAD, while the minor T allele occurs at approximately 0.26 across worldwide reference populations.
Frequently asked questions
Does my rs7738892 genotype determine my forehead shape?
No, your genotype at rs7738892 does not determine your forehead or facial shape. While statistical analyses detect minor associations with upper facial contours across large cohorts, facial appearance is influenced by hundreds of genes and developmental factors working together.
Is the rs7738892 variant linked to any disease or syndrome?
No, rs7738892 is considered a benign, normal-range physical trait variant. It is not classified as pathogenic in ClinVar and does not cause congenital cranial disorders or clinical disease.
Why is KIF6 studied in human facial development?
KIF6 encodes a kinesin motor protein that facilitates intracellular transport along microtubules and plays roles in cilia-related signaling pathways. Ciliary signaling is vital for guiding cranial neural crest cells during embryonic craniofacial morphogenesis, making the gene a biological candidate of interest.
Can DNA testing services use rs7738892 to generate an accurate facial composite?
No, DNA phenotyping cannot generate an accurate facial portrait using single variants like rs7738892. Reconstructing facial features from genetic data requires complex, multi-locus polygenic models, which currently offer limited accuracy for fine individual facial structures.
Sources & further reading
Educational information only, last refreshed 9/12/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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