biology

Lagovirus

Lagovirus is a biology 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 Lagovirus rather than just read about it. In short: Lagovirus is a genus of viruses, in the family Caliciviridae. Lagomorphs serve as natural hosts.

Key takeaways

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

Reference excerpt

Lagovirus is a genus of viruses, in the family Caliciviridae. Lagomorphs serve as natural hosts. There are two species in this genus. Diseases associated with this genus include: necrotizing hepatitis leading to fatal hemorrhages.

Taxonomy The genus contains the following species:

European brown hare syndrome virus Rabbit hemorrhagic disease virus

Virion properties

Morphology Virions consist of a capsid. The capsid is not enveloped, round with T=3 icosahedral symmetry. The isometric capsid has a diameter of 35–39 nm. Particles with T=1 symmetry, composed of 60 capsid proteins are also observed, which have diameter of about 15 nm. Capsids appear round to hexagonal in outline. The capsid surface structure reveals a regular pattern with distinctive features. The capsomer arrangement is clearly visible. Capsid with 32 cup-shaped depressions.

Life cycle Viral replication is cytoplasmic. Entry into the host cell is achieved by attachment to host receptors, which mediates endocytosis. Replication follows the positive stranded RNA virus replication model. Positive stranded RNA virus transcription is the method of transcription. Translation takes place by RNA termination-reinitiation. Lagomorphs serve as the natural host.

Physical and chemical properties The molecular mass (Mr) of virions is 15×106. Virions have a buoyant density in Caesium chloride (CsCl) of 1.33–1.36 g/cm3. The density gradient of virions in Potassium Tartrate-Glycerol is 1.29 g/cm3. The sedimentation coefficient is 170–187 svedberg (s20,w); of the other(s) are peak 160–170 svedberg (s20,w) (believed to consist of defective interfering particles). Under in vitro conditions virions are inactivated in acid environment of pH 4.5–7; stable in alkaline environment of pH 7–10.5. Virions are not stable at raised temperature in presence of high concentration of Mg++. Virions are sensitive to treatment with trypsin (in some strains, not sensitive to treatment with mild detergents, or ether, or chloroform. The infectivity is enhanced after treatment with trypsin (in some strains).

Genome The genome is not segmented and contains a single molecule of linear positive-sense, ssRNA. Minor species of non-genomic nucleic acid are some times also found in virions. The encapsidated nucleic acid is mainly of genomic origin, but virions may also contain subgenomic RNA. The complete genome is 7450 nucleotides long. The genome has a guanine + cytosine content of 49.3–50.1 %. The 5' end of the genome has a usually genome-linked protein (VPg), or methylated nucleotide cap (in the case of Hepatitis E virus). The 3' terminus has a poly (A) tract. Each virion contains a full-length copy, or defective interfering copies.

Proteins The viral genome encodes viral structural protein. Virions consist of 1 structural protein(s) (major species located in the capsid. Viral structural protein: Capsid protein has a molar mass of 59000–71000 Da; is the coat protein. Capsid protein has a molecular mass of minor 'soluble' 28–30 kDa.

Antigenicity Cross-reactivity is found. Cross-reactivity between species of the same serotype, but not with species of another serotype and some species of the same serotype, but not with all. Although the degree of antigenic specificity varies with the degree of relatedness, the antigenicity is distinct from serogroups of the same genus. Most species in the genus are related antigenically. They are sharing some epitopes in the structural proteins.

References

ICTVdB Management (2006). 00.012.0.02. Lagovirus. In: ICTVdB—The Universal Virus Database, version 4. Büchen-Osmond, C. (Ed), Columbia University, New York, USA

External links ICTV Report: Caliciviridae Viralzone: Lagovirus

Illustrations

Worked examples

Example 1 — a first encounter with Lagovirus

Start with the simplest possible case. Write down what Lagovirus claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, 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 Lagovirus 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 Lagovirus 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 Lagovirus

In research: Lagovirus appears in biology 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 Lagovirus 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: Lagovirus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Animal viral diseases, Caliciviridae, Leporid diseases, so understanding it makes those chapters shorter.
In everyday life: Look for Lagovirus 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 Lagovirus in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Lagovirus 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 Lagovirus out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Lagovirus in simple terms?

Lagovirus is a genus of viruses, in the family Caliciviridae. Lagomorphs serve as natural hosts.

Why does Lagovirus matter?

Because it connects several biology 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 Lagovirus?

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 Lagovirus.