From Allelic Heterogeneity to Biomechanical Phenotypes: A Functional New Genomic Model of ABCC11 Polymorphisms and Their Role in Human Chemical Ecology

The ABCC11 gene, through a single nucleotide polymorphism (SNP; rs17822931), is established as a primary determinant of human axillary secretion. Such a composition dictates the presence of both a binary phenotype of earwax (dry/wet) and the absence or presence thereof of characteristic body odor. However, significant phenotypic heterogeneity exists within genotypic groups, suggesting a more complex genetic architecture. This paper proposes a functional genomic model that expands upon the current biochemical pathway to position the biomechanical properties of the secretion as a critical phenotypic trait. We hypothesize that beyond the foundational secretion of odorant precursors, the ABCC11 genotype, influenced by allelic heterogeneity and modifier genes, actually impacts ecological behaviors and human interactions. Such biomechanical properties of the viscosity, rheology, and water content of apocrine secretions. directly impact the kinetics of odorant release, persistence on the skin, and dispersion through the air, thereby modulating the efficacy of chemical signal transmission. We outline a research program to characterize the ABCC11 variation, functionally validate novel alleles, define associated metabolomic and biomechanical phenotypes, and test their ecological consequences in behavioral assays. This model integrates population genetics, cell biology, materials science, and ethology to provide a holistic understanding of the role of ABCC11 in human chemical transmission.