KIF6 rs77388952: Facial Morphology and Genetic Variation
The rs77388952 polymorphism is a single nucleotide variant located within the KIF6 gene locus on human chromosome 6. Research indexed in resources like the GWAS Catalog links this locus to subtle differences in normal human facial shape and craniofacial morphology. Because facial features are highly polygenic, rs77388952 confers modest statistical effects rather than defining a person's appearance.
What each genotype means
| Genotype | What the research suggests | Reading |
|---|---|---|
| CC | Homozygous for the common major allele. In facial morphology genome-wide association studies, this background represents the baseline reference profile observed across general population cohorts. | Informational |
| CT | Heterozygous carrier of one minor allele. Having one copy of the variant allele is associated with subtle statistical shifts in local facial shape dimensions, though the individual effect is minimal and imperceptible to the naked eye. | Informational |
| TT | Homozygous for the minor allele. Carrying two copies of the minor allele is associated with the largest relative statistical shift in quantitative facial morphological metrics at this locus, while remaining entirely within typical human appearance variation. | Informational |
Genomic Context and the KIF6 Gene
The single nucleotide polymorphism rs77388952 is situated on chromosome 6 in the region of the KIF6 gene. This gene encodes kinesin family member 6, a molecular motor protein involved in intracellular transport along microtubules. While KIF6 gained early scientific attention in pharmacogenomic research exploring statin responses and cardiovascular outcomes, modern high-resolution mapping projects have increasingly surveyed noncoding variations in this chromosomal neighborhood for roles in developmental biology. Polymorphisms like rs77388952 predominantly lie within noncoding regions, suggesting that any functional influence likely stems from subtle regulatory alterations—such as modulating gene transcription, alternative splicing, or chromatin conformation during embryonic tissue development—rather than causing a direct disruption in the amino acid sequence of the kinesin motor itself.
Association with Normal Human Facial Variation
Genome-wide association studies (GWAS) analyzing three-dimensional facial imaging have identified hundreds of genetic loci that shape human facial features, as highlighted in comprehensive reviews on craniofacial architecture published in [PMC9482780](https://pmc.ncbi.nlm.nih.gov/articles/PMC9482780/). The rs77388952 variant has been documented in genomic catalogs with moderate evidence connecting it to measurable shifts in normal facial morphology. Studies utilizing multivariate shape analysis and dense surface landmarks evaluate quantitative traits such as facial widths, projections, and segmental curvatures. Variations in the KIF6 genomic neighborhood associate with small differences in typical-range facial structures rather than medical dysmorphisms. These discoveries demonstrate that typical craniofacial appearance is shaped by a broad spectrum of common variants operating in cellular networks during development.
Evidence Strength and Study Limitations
The evidence supporting the link between rs77388952 and facial morphology is rated as moderate. Craniofacial phenotypes represent complex, polygenic traits governed by hundreds of loci acting in concert, each conferring small individual effect sizes. Morphological GWAS can exhibit ancestry-specific differences due to divergence in allele frequencies and linkage disequilibrium across populations, as discussed in [Nature Genetics](https://www.nature.com/articles/s41588-022-01038-7). While landmark-based 3D morphometric pipelines identify reproducible statistical signals, direct mechanistic validation of the specific causal nucleotide at the rs77388952 locus remains an ongoing area of investigation. It is standard in statistical genomics to treat lead SNPs as markers that may be tagging a wider functional haplotype rather than definitively acting as the sole causal driver.
Practical Implications for Consumers
Finding rs77388952 in personal raw genetic data provides an educational glimpse into the biology of human diversity, but it carries no clinical or diagnostic significance. Normal facial shape is deeply polygenic, meaning no individual single nucleotide polymorphism can predict an individual's facial appearance, facial structure, or profile. Furthermore, rs77388952 does not serve as a diagnostic marker for any craniofacial disorder, medical malformation, or aesthetic phenotype. Readers should understand that genetic testing for appearance-linked markers offers an interesting window into human evolution and complex trait mapping, but cannot accurately reconstruct personal features or determine health outcomes.
How common is this variant?
The minor allele for rs77388952 has an estimated frequency of approximately 0.15 in European populations, meaning around 25% to 30% of individuals carry at least one copy of the variant allele.
Frequently asked questions
Can my rs77388952 genotype predict what my face looks like?
No. Human facial shape is influenced by thousands of genetic variants alongside environmental and developmental factors. A single variant like rs77388952 contributes only a minute fraction of the overall variation, making it impossible to reconstruct an individual's face from this marker alone.
Is rs77388952 related to any facial deformity or health condition?
No, this variant is associated purely with typical quantitative variation in healthy individuals. It is not classified as pathogenic and is not a clinical indicator for craniofacial syndromes or oral clefts.
Why is the KIF6 gene involved in facial development?
KIF6 encodes a kinesin motor protein that facilitates intracellular movement along microtubules. The SNP rs77388952 lies in a noncoding region that may serve regulatory functions, subtly altering developmental pathways in embryonic tissues such as cranial neural crest cells.
Does this variant have any known medication or statin associations?
While other specific variants within the KIF6 locus (such as Trp719Arg / rs20455) have been widely investigated regarding cardiovascular events and statin response, rs77388952 itself is primarily cataloged for normal morphological variation. Any questions about medications or statin safety should be discussed with a qualified healthcare provider.
Sources & further reading
Educational information only, last refreshed 9/9/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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