DNA Analysis of Ancient Cheetah Mummies Reveals Surprising Subspecies Insights Involving UP Researchers

A groundbreaking study has unveiled the genetic secrets of ancient cheetah populations through DNA analysis of naturally mummified remains discovered in remote Saudi Arabian caves. These findings, published in Communications Earth & Environment, not only rewrite our understanding of cheetah subspecies distribution but also offer vital insights for modern conservation efforts, with key commentary from University of Pretoria (UP) wildlife veterinary specialist Dr. Adrian Tordiffe highlighting their significance. The research underscores the pivotal role of South African higher education institutions like UP in global wildlife genetics, where expertise in cheetah health and conservation genetics drives international collaborations.

The discovery bridges ancient history and contemporary rewilding initiatives, demonstrating how academic research from South African universities contributes to preserving one of Africa's most iconic species. As cheetahs face ongoing threats, such studies provide a roadmap for sustainable recovery, positioning UP as a leader in veterinary wildlife studies.

🦒 The Serendipitous Cave Discovery in Saudi Arabia

In 2022, a team from Saudi Arabia's National Center for Wildlife (NCW) ventured into a network of remote caves in the northern region, initially searching for bats and insects. What they found instead was extraordinary: seven naturally mummified cheetahs, alongside skeletal remains of over 50 more, and evidence of prey like bones and scat. These caves, preserved by dry, cool conditions, served as dens for generations of cheetahs, marking the first documented case of natural mummification in big cats on the Arabian Peninsula.

Radiocarbon dating placed the mummies between 127 and 4,223 years old, with skeletal remains extending back further. Radiographic analysis revealed a mix of cubs, subadults, and adults, indicating family groups used the caves for shelter. This unexpected find challenges previous assumptions about cheetah habitat preferences, as they are typically open-savanna dwellers, and highlights caves' role as biodiversity archives.

The NCW team's work, led by Ahmed Al-Boug, involved excavating 134 caves, with five yielding cheetah evidence. This not only enriches Arabian paleontology but also fuels Saudi Arabia's ambitious rewilding program, aiming to restore extirpated species like cheetahs, gone from the region since the 1970s.

UP's Wildlife Veterinary Expertise Lights the Way

The University of Pretoria's Faculty of Veterinary Science has long been at the forefront of cheetah conservation genetics. Dr. Adrian Tordiffe, a lecturer and wildlife veterinary specialist, has commented on the Saudi study, noting its 'notable' genetic insights. His work spans cheetah health monitoring, reintroduction projects—like leading veterinary support for India's cheetah revival—and genetic studies on inbreeding and admixture in captive populations.

UP's Onderstepoort Veterinary Academic Hospital and Centre for Veterinary Wildlife Studies have pioneered non-invasive scatology for population genetics and metabolomic analysis of cheetah serum. These efforts address cheetahs' low genetic diversity—a bottleneck from ~10,000 years ago—making subspecies identification crucial. Tordiffe's expertise bridges South African research with global projects, emphasizing how UP-trained vets ensure healthy translocations.

For aspiring wildlife researchers, UP offers specialized programs. Explore higher ed jobs in veterinary science or university jobs in conservation genetics to join such impactful work.

Decoding Ancient DNA: Methods and Challenges

Extracting DNA from mummified remains is no small feat. The team used protocols from Dabney et al. and Gamba et al. for ancient DNA (aDNA) extraction, preparing libraries with NEBNext and sequencing on Illumina platforms to ~50x coverage. Reads mapped to the cheetah reference genome via BWA, processed with SAMtools and GATK for variant calling.

Using 23,000 SNPs, principal component analysis (PCA), phylogenetic trees (ngsDist, FastME, RAxML), and admixture (ngsAdmix), they classified genomes. Low PCR duplication (8-11%) indicated quality aDNA. Mitochondrial DNA aligned with A. j. venaticus haplogroup, while nuclear DNA diverged for older samples.

UP researchers like Tordiffe have advanced similar techniques for live cheetahs, using SNPs for parentage and relatedness in metapopulations. This expertise informs aDNA studies, overcoming degradation via specialized labs at UP.

Subspecies Revelations: A Lost Arabian Lineage

The genomes revealed two distinct groups: the youngest mummy (~127 years) clustered with Asiatic cheetahs (A. j. venaticus), while older ones (~1,800-4,200 years) aligned with Northwest African cheetahs (A. j. hecki). This suggests temporal shifts or multiple lineages in Arabia, challenging single-subspecies assumptions.

Cheetahs have five subspecies: Southern (A. j. jubatus), East African (A. j. soemmeringii), Asiatic, Northwest African, and Northeast African. Arabia's ancient population links to critically endangered groups—<30 Asiatic left in Iran, ~400 NW African. Tordiffe notes this genetic match aids sourcing for rewilding, avoiding hybridization risks.

SA's cheetah metapopulation management, led by UP, uses similar genetics to maintain diversity, preventing local extinctions.

Photo by Ahmed Galal on Unsplash

Genetic Proximity to Modern Survivors

Admixture analysis showed no significant East/Southern African input, confirming Arabian cheetahs' uniqueness. Mummy 1's genome was closest to modern Asiatic, older to NW African. This dual heritage offers a 'second gene pool' for Saudi plans.

UP's genetic databases, with 218 SNPs validated across families, mirror this precision. Tordiffe's work on Indian reintroductions from Namibian stock highlights translocation genetics, paralleling Saudi efforts.

Rewilding Implications for Saudi Arabia

Saudi's NCW breeds cheetahs for release, restoring ecosystems post-ungulate reintroductions. Ancient DNA guides donor selection: NW African for resilience, Asiatic for heritage. Challenges include low numbers and adaptation.

UP's India project, translocating 20 cheetahs (8 died initially from stress), informed protocols. Tordiffe stresses health screening, echoing Saudi needs. SA universities train vets for such missions, boosting global biodiversity.

University of Pretoria's Legacy in Cheetah Science

UP's Faculty of Veterinary Science hosts the Centre for Veterinary Wildlife Studies, researching cheetah reproduction, genetics, and pathology since the 1970s. Theses on mitochondrial genomes and inbreeding aid conservation.

Dr. Tordiffe's PhD on metabolomics and role in de Wildt Cheetah Centre exemplify UP's impact. Collaborations with CCF Namibia and India position UP as a hub for aspiring conservationists. Programs integrate genetics, ecology, and vet medicine.

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Challenges in Ancient DNA and Conservation Genetics

aDNA degrades; contamination risks high. Saudi team mitigated with clean labs, double-blind extractions. Cheetahs' bottleneck limits diversity, amplifying inbreeding depression—UP studies quantify this via SNPs.

Step-by-step: 1) Sample collection in caves; 2) 14C dating; 3) DNA extraction; 4) Sequencing; 5) Bioinformatic analysis (PCA, trees); 6) Subspecies assignment.

• Low coverage overcome by imputation.
• Mitochondrial vs nuclear discordance noted.
• Future: More samples for full phylogeny.

Stakeholder Perspectives and Broader Impacts

NCW's Al-Boug sees caves as 'time capsules'. Cheetah Conservation Fund's Laurie Marker praises data for rewilding. Tordiffe: 'Challenges assumptions on subspecies boundaries.'

In SA, UP partners with SANBI, EWT for metapopulation management. Economic: Tourism boost from rewilded cheetahs. Cultural: Cheetahs symbolize speed, heritage.

Photo by Bibhash (Polygon.Cafe) Banerjee on Unsplash

Future Outlook: Collaborations and Actionable Insights

Saudi plans phased releases; UP-like genetics monitoring essential. International ties—SA, Namibia, Iran—key. Train via UP's MSc Wildlife Vet programs.

Actionable: 1) Fund aDNA labs; 2) Genomic databases; 3) Translocation protocols; 4) Public awareness.

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Conclusion: UP's Role in Saving the Cheetah

This study exemplifies how UP researchers elevate global conservation. Tordiffe's insights affirm SA's leadership. For careers, rate professors at Rate My Professor, find higher ed jobs, or craft your academic CV. Engage via comments below.