Genome banking and biodiversity preservation are civilisation-continuity infrastructure. They cannot substitute for living ecosystems, but they can preserve genetic options needed to restore crops, livestock, keystone species, ecological functions, and biomedical resources after catastrophic population loss.
Strategic situation
The latest cited IUCN assessment evaluated 169,420 species and identified 47,187 as threatened with extinction—approximately 28% of assessed species.[5] This is not a global total: fewer than 5% of described species have had their extinction risk evaluated, so the actual number at risk remains uncertain and likely much higher.[6]
Selected assessed groups show severe exposure:
- Amphibians: approximately 41% threatened.
- Warm-water reef-building corals: approximately 44% threatened.
- Sharks and rays: approximately 38% threatened.
- Trees: approximately 38% threatened.
- Mammals: approximately 26% threatened.
- Freshwater fishes: approximately 26% threatened.
- Birds: approximately 11.5% threatened.[1]
Freshwater biodiversity is particularly important for human survival. A 2025 assessment found at least 4,294 of 23,496 freshwater animal species—18.3%—at high risk of extinction, while the assessed groups collectively showed roughly 24% at risk; freshwater crabs, crayfish, and shrimp reached about 30%, and freshwater fishes about 26%.
These figures exclude many undescribed species, microbial lineages, local genetic varieties, and populations that are not yet species-level extinction risks but are already losing genetic diversity.
Seed banks and genome banks
A seed bank stores viable reproductive material—usually dried seeds—under controlled temperature and humidity. Its objective is to regenerate a plant genetically close to the stored accession. Seeds can often be germinated directly, multiplied, and returned to cultivation.
A genome bank stores biological information or reproductive cells, including:
- DNA extracts and sequence data.
- Sperm, ova, embryos, and reproductive tissues.
- Somatic cells that may potentially be reprogrammed.
- Microbial cultures.
- Pollen, spores, plant meristems, and cryopreserved tissue.
The distinction is operational:
| Feature | Seed bank | Genome bank |
|---|---|---|
| Primary material | Viable seeds | DNA, cells, gametes, embryos, tissues, sequence data |
| Immediate regeneration | Usually possible by germination | Often impossible without advanced reproductive technology |
| Main coverage | Seed-producing plants | Animals, plants, fungi, microbes, and non-seeding plants |
| Genetic fidelity | Whole seed genome, often with maternal effects | Depends on material; DNA alone lacks viable cells and developmental context |
| Storage challenge | Viability loss over time | Cryogenic failure, molecular degradation, data loss, contamination |
| Restoration value | High for crop and wild-plant recovery | Essential for animals, sterile crops, extinct populations, and genetic rescue |
A seed bank is therefore a living biological archive. A DNA-only genome bank is an information archive, not a ready-to-grow organism. For continuity planning, each priority species should have at least three layers: authenticated sequence data, viable cellular material, and living populations or managed breeding groups.
Seed banks are also incomplete. They poorly cover:
- Recalcitrant seeds that cannot tolerate drying or freezing.
- Clonally propagated crops such as banana, potato, cassava, and many fruit trees.
- Species whose genetic diversity is concentrated in wild populations.
- Microbiomes, pollinators, soil organisms, and ecological interactions.
Storage media and expected longevity
Longevity depends on temperature, humidity, radiation, contamination, chemical purity, replication, and whether the archive preserves only a sequence or viable biological material. No medium should be treated as permanent without periodic integrity checks and migration.
### Cryopreserved cells, gametes, and embryos
For restoration, cryopreserved viable material is generally more valuable than DNA alone. In liquid nitrogen at approximately −196°C, biochemical reactions are reduced to negligible levels, provided samples remain frozen and are not repeatedly warmed.
Practical limitations include:
- Dependence on uninterrupted liquid-nitrogen supply or validated vapor-phase systems.
- Equipment failure and power or logistics disruption.
- Ice damage if samples are poorly cryoprotected.
- Low reproductive success for some species.
- Inability to cryopreserve mature oocytes, embryos, or tissues reliably in many taxa.
- Small founder numbers and consequent inbreeding.
Cryobanks should use independent facilities, duplicate samples, different geographic regions, and both liquid-nitrogen and dry backup records.
### Silicon and semiconductor storage
Silicon-based media include hard drives, solid-state drives, optical discs, and semiconductor DNA-storage devices. Their useful life varies sharply:
- Consumer hard drives and SSDs are generally measured in years to decades, not centuries, under operational conditions.
- Properly manufactured archival optical media can last decades to roughly a century, depending on material and environment.
- Semiconductor and silicon-chip storage can be extremely stable in controlled conditions, but electronics, controllers, interfaces, and file formats become obsolete long before the substrate necessarily fails.
Silicon is suitable for redundant operational copies, metadata, genomic indexes, and frequently accessed sequence files. It is not sufficient as the sole millennium archive. Every archive needs checksums, open formats, readable documentation, and planned migration at intervals of approximately 5–20 years, depending on the medium.
### Synthetic DNA storage
Synthetic DNA stores digital information by encoding bits into designed DNA molecules. Its advantages are extraordinary density and potentially long chemical stability when dried, protected from light, oxygen, water, and nucleases.
In controlled laboratory conditions, DNA can remain readable for centuries to millennia, but this is not equivalent to proven, unattended, thousand-year reliability. Main risks are:
- Chemical degradation.
- Sequence errors during synthesis and reading.
- DNA cross-contamination.
- Loss of decoding schemes.
- Dependence on future sequencing equipment.
- Cost and slow write/read rates.
- Inability to recreate a living organism from sequence alone without cells, epigenetic information, developmental systems, and reproductive hosts.
Synthetic DNA is best used for immutable master copies of reference genomes, restoration protocols, taxonomic records,