Pangolin Genome Sequencing: Advances in Genetic Research

Published 8 June 2026 | 10 min read

Advances in genome sequencing have opened a new window into pangolin biology. From revealing unusual immune adaptations to enabling the geographic tracing of confiscated scales, genomics is becoming indispensable to the effort to protect the world's most trafficked mammals.

Why Pangolin Genomes Matter for Conservation

For species as elusive as pangolins, where population censuses are unreliable and direct observation is limited, genomic data fills critical knowledge gaps. Whole-genome sequencing reveals genetic diversity within and between populations, identifies evolutionarily significant units requiring separate management, and detects inbreeding in fragmented groups.

All eight pangolin species are threatened, yet little is known about how genetically distinct different populations are. The development of conservation genetics and DNA-based tools for pangolins has established a foundation for evidence-based management that did not exist a decade ago.

History of Pangolin Genome Sequencing

The first pangolin genome assembly was published in 2016 using the Malayan pangolin (Manis javanica). Produced using short-read Illumina sequencing, this draft immediately yielded significant biological insights. Improved assemblies for the Chinese pangolin (Manis pentadactyla) and Indian pangolin (Manis crassicaudata) followed, benefiting from long-read platforms such as PacBio and Oxford Nanopore.

By the early 2020s, chromosome-level assemblies became available for select species. As sequencing costs have plummeted, reference genomes that once required millions of rand can now be generated affordably, bringing whole-genome approaches within reach of research groups in range countries including South Africa.

What Genome Analysis Reveals About Pangolin Immunity

The most striking genomic finding has been unusual modifications to the innate immune system. Pangolins carry a pseudogenised IFNE (interferon epsilon) gene -- a type I interferon normally expressed in epithelial tissues. Mutations have rendered this gene non-functional.

Pangolins have also lost genes encoding pattern recognition receptors that trigger inflammation, including members of the PYHIN gene family involved in sensing intracellular pathogen DNA. Researchers propose these modifications represent an evolutionary trade-off: a dampened inflammatory response may help pangolins tolerate microbial exposure from excavating soil and consuming ants and termites, but may leave them more susceptible to novel viral pathogens.

Implications for Disease Susceptibility

The pangolin ACE2 receptor has binding affinity for the SARS-CoV-2 spike protein, and weakened innate immune surveillance could allow viruses to persist in pangolin tissues longer than in mammals with fully functional interferon systems. This does not make pangolins uniquely dangerous as disease reservoirs, but it underscores the importance of host immunogenetics in assessing zoonotic risk -- a topic explored in our coverage of pangolin disease ecology and zoonotic research.

Population Genomics and Genetic Diversity

Whole-genome resequencing of multiple individuals enables analyses that quantify diversity and detect population structure. Studies of Chinese pangolins have documented extremely low heterozygosity -- among the lowest for any mammal -- reflecting historical bottlenecks compounded by recent declines. Malayan pangolins show higher diversity, though populations are fragmenting rapidly.

Comparative genomics across all eight species remains hampered by uneven sampling. Asian species are better represented, partly because trade confiscations have provided tissue. Whether African species harbour greater diversity, as preliminary analyses suggest, remains an open question. The evolutionary history linking all species is examined in our article on pangolin evolution and the fossil record.

Anti-Trafficking Forensics: Geographic Origin Through DNA

By building reference databases of genotyped samples from known locations, researchers have developed assignment tests that match confiscated scales to source populations with high confidence. This has demonstrated that scales seized in Southeast Asian ports often originate from African populations, confirming the transcontinental nature of trafficking.

Every tissue sample collected during rehabilitation or post-mortem examination strengthens these databases. The expanding role of DNA forensics in pangolin wildlife crime investigations is helping law enforcement map routes and build prosecution cases.

Reference Genomes: Progress and Gaps Across Eight Species

Asian species

The Malayan pangolin has the most complete assembly with chromosome-level scaffolding. The Chinese and Indian pangolins have high-quality drafts used in comparative studies. The Philippine pangolin (Manis culionensis), restricted to the Palawan Islands, has only fragmentary data.

African species

Temminck's ground pangolin (Smutsia temminckii) has the most advanced genomic resources among African species. Draft assemblies exist for the white-bellied pangolin (Phataginus tricuspis) and giant ground pangolin (Smutsia gigantea). The black-bellied pangolin (Phataginus tetradactyla) has the least genomic data. Completing the set would enable comparative analyses of immune function, demographic history and adaptive evolution.

South African Genomics Work on Temminck's Ground Pangolin

South Africa has emerged as a leading centre for pangolin genomics in Africa. Institutions including the University of Pretoria, Stellenbosch University and the South African National Biodiversity Institute (SANBI) are conducting population genomic surveys using samples from across the species' range -- from the Kalahari to the Limpopo bushveld. These surveys aim to determine whether distinct genetic clusters exist within South Africa, with implications for translocation protocols and breeding programmes.

Researchers are also scanning the genome for signals of local adaptation. If Kalahari populations have evolved distinct adaptations to aridity, this would argue against mixing individuals from different regions during rehabilitation. Collaborative projects with institutions in Zimbabwe, Mozambique and Botswana are expanding range-wide sampling.

The Role of Biobanking

Biobanking -- the systematic collection and preservation of tissue, blood and extracted DNA -- underpins all genomic research. For pangolins, it is particularly critical because sampling opportunities are rare. Most samples are obtained opportunistically during veterinary treatment, rehabilitation or post-mortem examination. Well-managed biobanks preserve these at ultra-low temperatures, ensuring DNA remains extractable for decades.

Modern biobanking extends to creating extracted DNA libraries and immortalised cell lines, providing unlimited genetic material from individual animals. The African Pangolin Working Group and affiliated institutions maintain collections serving as the foundation for current and future studies.

CRISPR and Future Gene-Editing Applications

Gene-editing technologies such as CRISPR-Cas9 raise the possibility of directly intervening in the genomes of threatened species. While largely theoretical for pangolins, the foundational work now under way -- reference genomes, functional gene identification, immune pathway characterisation -- is what would guide future interventions such as engineering disease resistance or restoring diversity in bottlenecked populations.

The most realistic near-term application is CRISPR-based diagnostics. Detection assays can identify pangolin DNA in processed products with extraordinary sensitivity, potentially enabling rapid field testing of suspected contraband without laboratory facilities.