A Critical Review of DNA Analyses in Sasquatch/Bigfoot Research and the Conditional Hypothesis of Homo sapiens Affinity Author: Ray H Harwood

A Critical Review of DNA Analyses in Sasquatch/Bigfoot Research and the Conditional Hypothesis of Homo sapiens Affinity Author: Ray H Harwood Date: May 25, 2026 Disclaimer and Methodological Framework No peer-reviewed biological evidence currently confirms Sasquatch/Bigfoot as an extant taxon. The majority of DNA studies associated with the subject have either: 1) returned results consistent with known species, 2) been contaminated/degraded, or 3) failed independent replication. This thesis therefore adopts a conditional framework: If authentic, uncontaminated Sasquatch biological material were recovered, then how would its genetic profile be evaluated against known Homo sapiens populations, using the genomic distinctions between Native American and European American lineages you outlined? This is a methodological exercise, not an assertion of existence. 1. Executive Summary of DNA Studies in Sasquatch Research 1.1 Published and Publicized DNA Claims, 1990–2025 The following represents the major datasets cited in cryptozoological literature. None have achieved acceptance in mainstream genomics. Study/Source Sample Type Claimed Result Mainstream Assessment Ketchum et al., 2013 “Novel North American Hominins” 111 hair, blood, tissue, saliva samples mtDNA = Homo sapiens; nuDNA = “novel hominin” hybrid with angel/human mother Journal DeNovo not indexed; failed independent replication; contamination and primer bias cited by geneticists Sykes et al., 2014 Proc. R. Soc. B 36 hair samples from global “yeti/bigfoot” submissions 100% matched known species: bear, horse, cow, human, wolf, raccoon Peer-reviewed; no unknown primate DNA detected Disotell/Bartlett, 2012–2015 Various media Hair samples from multiple U.S. submissions All resolved to Ursus americanus, Canis familiaris, Homo sapiens University lab testing; results consistent with contamination Sierra Kills / “Steak Sample” 2013 Alleged tissue from Sierra Nevada Claimed human mtDNA, unknown nuDNA No chain of custody; no publication; private lab only Olympic Project nests, 2017–2021 eDNA from soil in constructed nests, WA Primarily deer, human, bear; one sequence flagged “unclassified primate” eDNA prone to contamination; unclassified ≠ unknown species Oxford-Lausanne Collateral Hominid Project Hair from Russia, Bhutan, India, U.S. All matched Ursus arctos, Ursus maritimus, H. sapiens 2014 ZooKeys publication Key Pattern: When sequencing is successful, mtDNA almost always resolves to H. sapiens, U. americanus, or domesticated animals. Claims of “unknown hominin” nuDNA have not survived independent verification. 2. Genomic Criteria for Distinguishing Human Populations Per your provided framework, Homo sapiens subpopulations are distinguished by: 2.1 Haplogroup Architecture Lineage Native American European American Y-DNA Q-M242 dominant; C-M130 minor R1b-M269, R1a-M417, I-M170 dominant mtDNA A2, B2, C1, D1, X2a H, U, J, T, K, V, X2b 2.2 Population Genetics Native American: Lower heterozygosity due to Beringian founder effect; high allele locality; elevated Denisovan introgression ∼0.1–0.2%. European American: Higher heterozygosity; Neanderthal introgression ∼1.5–2.1%; Denisovan ∼0%. 2.3 Adaptive Loci Native American: EPAS1 high-altitude alleles, FADS cluster for cold-adapted lipid metabolism, specific HLA pathogen resistance. European: LCT lactase persistence, SLC24A5 depigmentation, TLR cluster for agricultural disease exposure. 2.4 Deep Ancestry Both descend from Ancient North Eurasian [ANE] admixture, but diverged >15 kya with subsequent drift and selection. 3. Conditional Analysis: What Would “Sasquatch = Homo sapiens” Require Genetically? If authentic Sasquatch tissue were sequenced and determined to be a form of H. sapiens, the data would need to satisfy all standard species-level criteria while explaining reported phenotypes. 3.1 Expected mtDNA/Y-DNA Result mtDNA must fall within known H. sapiens haplogroups. A result of A2, B2, C1, D1, or X2a would imply Native American maternal descent. A result of H, U, or T would imply Eurasian maternal descent. Y-DNA must be Q, C, R, or another H. sapiens haplogroup. A novel Y-haplogroup basal to all known H. sapiens would suggest a new species, not a form of H. sapiens. Relevance to Claims: Ketchum et al. reported “100% human mtDNA” in samples, often haplogroup H. If valid and uncontaminated, that would indicate a H. sapiens maternal line of recent Eurasian origin, not a relict Beringian population. This conflicts with the “ancient Native American” hypothesis. 3.2 Nuclear DNA and Admixture To be H. sapiens yet distinct, Sasquatch nuDNA would need to: Show >98.5% identity to H. sapiens reference genome. Exhibit a unique drift profile consistent with >15ky isolation. Contain H. sapiens-specific alleles for FOXP2, ASPM, MCPH1, etc. Lack structural variants that define H. neanderthalensis or H. denisova. Denisovan Signature: You noted Denisovan variants are “heavily concentrated in Indigenous American genomes but practically absent in European genomes.” A Sasquatch population isolated in North America since the Pleistocene should show elevated Denisovan introgression relative to modern Europeans, similar to or exceeding modern Native Americans. A result of 0% Denisovan + 2% Neanderthal would instead mimic European Americans. 3.3 Heterozygosity and Bottlenecks An isolated North American hominin would display: Extremely low heterozygosity, lower than modern Native Americans due to second founder effect. High runs of homozygosity [ROH]. Unique localized alleles not in 1k Genomes Project. Modern “Sasquatch DNA” claims showing high heterozygosity would be inconsistent with a small, isolated relict population and would instead suggest contamination with modern humans. 3.4 Adaptive Loci Gigantism, hypertrichosis, and cold tolerance in a North American forest hominin would predict selection at: GH1/GHRHR pathways for size EDA2R, FGF5 for hair density UCP1, FADS cluster for thermogenesis These would be H. sapiens genes under unique selection, not novel genes. 4. Correlating Existing Claims to the Native American vs. European American Framework Genomic Criterion If Sasquatch = Relict Beringian H. sapiens What Published Claims Actually Report Assessment mtDNA Haplogroup A2, B2, C1, D1, X2a expected Ketchum: H, T, U common; Sykes: Human = modern contamination Contradicts Beringian model; matches European American profile or lab contamination Y-DNA Q-M242 expected No Y-DNA recovered in any publicized study No data Denisovan % ≥0.1%, possibly higher than modern NA No study reports Denisovan quantification No data Neanderthal % ∼1.5–2.1%, similar to all non-Africans No study reports Neanderthal quantification No data Heterozygosity Very low Ketchum claimed “mosaic” human/unknown; no metrics given Unverifiable Adaptive Alleles EPAS1, FADS variants None reported No data Conclusion of Correlation: Current publicized DNA data do not match the genomic signature expected for an isolated Beringian-derived H. sapiens population. The only recurring “human” result is mtDNA haplogroup H, which is common in European Americans and in laboratory personnel. This pattern is more consistent with contamination than with a relict population. 5. Mainstream Scientific Position and Burden of Proof 5.1 Why Current Evidence Does Not Prove Homo sapiens Status No Type Specimen: ICZN requires a holotype for species designation. No bones, body, or tissue with chain of custody exists. Contamination Prevalence: Hair is dead keratin that adsorbs environmental DNA. Most “samples” are found in human-trafficked areas. No Replication: The gold standard—independent labs sequencing blind samples with identical results—has never occurred. mtDNA vs nuDNA Discordance: Human mtDNA + “unknown” nuDNA is a classic signature of contamination: human mtDNA from handler, nuDNA failure due to degradation. 5.2 What Would Constitute Proof To demonstrate Sasquatch is a form of H. sapiens: Recover tissue with documented chain of custody. Generate >10x whole-genome coverage in 3 independent labs. Show the genome nests within H. sapiens phylogeny via maximum-likelihood trees. Identify unique drift and selection consistent with North American isolation. Publish in indexed, peer-reviewed journal with raw data in GenBank/SRA. 6. Final Academic Assessment Using the genomic framework that distinguishes Native American from European American DNA, we can define exact genetic predictions for a hypothetical Sasquatch population if it were a form of H. sapiens. To date, zero samples in the public domain meet those predictions. The data that do exist—human mtDNA of Eurasian haplogroups, lack of Denisovan quantification, absence of Y-DNA, and failure to replicate—are more parsimoniously explained by modern human contamination than by a relict Beringian H. sapiens population. Therefore, while one can model what Sasquatch DNA should look like if it were H. sapiens, current evidence does not support the conclusion that it is H. sapiens. The hypothesis remains scientifically unproven and resides in the domain of speculative anthropology until biological material meeting forensic and genomic standards is produced. 7. Proposed Research Protocol for Future Claims Field Collection: Use sterile technique, PPE, and video documentation. Decontamination: Bleach/rinse hair; separate root from shaft. Sequencing: Hybridization capture for primate-specific loci + whole-genome shotgun. Authentication: Damage patterns consistent with ancient DNA; <5% modern human contamination via schmutzi. Phylogenetics: Place genome in 1000 Genomes + Neanderthal/Denisovan panel. If results show a H. sapiens genome with Q-M242 Y-DNA, A-D mtDNA, elevated Denisovan alleles, and unique North American selection, the relict hominin hypothesis would gain empirical support. References Ketchum, M. S., et al. 2013. DeNovo: Journal of Science 1:1-34. Sykes, B. C., et al. 2014. Proc. R. Soc. B 281: 20140161. Reich, D., et al. 2012. Nature 488: 370–374. [Denisovan introgression] Raghavan, M., et al. 2014. Nature 505: 87–91. [Ancient North Eurasians] Rasmussen, M., et al. 2014. Nature 506: 225–229. [Anzick-1 genome]