science

Paleovirology

Paleovirology is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Paleovirology rather than just read about it. In short: Paleovirology is the study of viruses that existed in the past but are now extinct. In general, viruses cannot leave behind physical fossils; therefore indirect evidence is used to reconstruct the past.

Key takeaways

Paleovirology belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Paleovirology to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Paleovirology from memory before moving on to harder problems.

Reference excerpt

Paleovirology is the study of viruses that existed in the past but are now extinct. In general, viruses cannot leave behind physical fossils; therefore indirect evidence is used to reconstruct the past. For example, viruses can cause evolution of their hosts, and the signatures of that evolution can be found and interpreted in the present day. Also, some viral genetic fragments which were endogenized into germline cells of an ancient organism have been passed down to our time as viral fossils, or endogenous viral elements (EVEs). EVEs that originate from the integration of retroviruses are known as endogenous retroviruses, or ERVs, and most viral fossils are ERVs. They may preserve genetic code from millions of years ago, hence the "fossil" terminology, although no one has detected a virus in mineral fossils. The most surprising viral fossils originate from non-retroviral DNA and RNA viruses.

Terminology Although there is no formal classification system for EVEs, they are categorised according to the taxonomy of their viral origin. Indeed, all known viral genome types and replication strategies, as defined by the Baltimore classification, have been found in the genomic fossil record. Acronyms have been designated to describe different types of viral fossil.

EVE: Endogenous viral element ERV: Endogenous retrovirus HERV: Human Endogenous Retrovirus NIRV: Viral fossils originating from non-retroviral RNA viruses have been termed Non-retroviral Integrated RNA Viruses or NIRVs. Unlike other types of viral fossils, NIRV formation requires borrowing the integration machinery that is coded by the host genome or by a co-infecting retrovirus. Other viral fossils originate from DNA viruses such as hepadnaviruses (a group that includes hepatitis B).

Resurrection Successful attempts to "resurrect" extinct viruses from the DNA fossils have been reported. In addition, Pithovirus sibericum was revived from a 30,000-year-old ice core harvested from permafrost in Siberia, Russia.

See also Ancient DNA Endogenous retrovirus Human Genome Project Insertional mutagenesis Invertebrate iridescent virus 31 Micropaleontology Paleobiology Paleogenetics Viral eukaryogenesis

References

Illustrations

Worked examples

Example 1 — a first encounter with Paleovirology

Start with the simplest possible case. Write down what Paleovirology claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Paleovirology before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Paleovirology ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Paleovirology

In research: Paleovirology appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Paleovirology in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Paleovirology is common in secondary-school and first-year university syllabi. It links to neighbouring topics Subfields of paleontology, Virology, so understanding it makes those chapters shorter.
In everyday life: Look for Paleovirology outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Paleovirology in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Paleovirology means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Paleovirology out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Paleovirology in simple terms?

Why does Paleovirology matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Paleovirology?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Paleovirology.