biology

VXN

VXN 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 VXN rather than just read about it. In short: Vexin is a protein encoded by VXN gene. VXN is found to be highly expressed in regions of the brain and spinal cord.

Key takeaways

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

Reference excerpt

Vexin is a protein encoded by VXN gene. VXN is found to be highly expressed in regions of the brain and spinal cord.

Gene

Location VXN is found along the plus strand of chromosome 8. The entire gene is 58,522 bp long. VXN is flanked by alcohol dehydrogenase iron containing 1 and Myb proto-oncogene like 1.

Homology

Paralogs No human paralogs for VXN have been identified

Orthologs

Vexin is found in all classes of vertebrates, including mammals, birds, fish, reptiles and amphibians. The most distant ortholog of VXN is in Callorhinchus milli, which diverged from the human version of the gene an estimated 482.9 million years ago. The gene has not been found in any plants, fungi or single celled organisms.

Homologous domains The N-terminus and C-terminus are highly conserved regions across both distant and close orthologs. The orthologs of vexin all show conservation of the SH3 protein domain family as well as a domain of unknown function (DUF4648).

mRNA

Splice variants VXN does not have any alternative mRNA splice variants. The mature mRNA is approximately 3,741 base pairs in length and contains six exons.

Protein

General properties

Vexin is 207 amino acids long, which equates to a molecular weight of 22.6 kdal. The isoelectric point of the protein is 10.42 which indicates the pH of the protein is basic. Vexin does contain a domain of unknown function (DUF4648) and is a part of the SH3 domain family, which is known to bind to proline-rich ligands. The secondary and tertiary structure of this protein is not well known.

Composition Vexin is considered rich in arginine, and poor in phenylalanine compared to the composition of the average human protein. Vexin does contain several regions of positively charged runs and has a high concentration of basic amino acids.

Post-translational modifications Vexin is predicted to undergo several types of post translational modifications. With a high degree of certainty, it is predicted that vexin undergoes lysine glycation, O-glycosylation, serine, threonine and tyrosine phosphorylation, SUMOylation and initial methionine acetylation.

Subcellular location Vexin is predicted to be a nuclear protein, given the classical nuclear localization signal found at amino acids Lys191 to Lys193. Vexin does not contain any transmembrane domains or signal peptides suggesting that it is an intracellular protein.

Expression

VXN has shown to be ubiquitously expressed in the body. The gene is expressed in 13 different types of tissue throughout the body, with the brain, spinal cord and nerves showing elevated expression of the gene. Specifically, the isocortex and hippocampal formation areas of the brain show high levels of expression. In addition to healthy tissue, vexin is also found in several disease states. These disease states include chondrosarcoma, glioma, kidney tumors, liver tumors, and germ cell tumors. VXN is only expressed in infants and adults.

Clinical significance VXN has been associated with breast cancer in humans. The gene has been researched in connection with estrogen receptor 1- enhancer (ESR1), whose expression determines if a breast cancer patient receives endocrine therapy. It is predicted that VXN has ESR1 enhancer regions that become hypermethylated and promote acquired endocrine resistance in breast cancer.

References

Illustrations

Worked examples

Example 1 — a first encounter with VXN

Start with the simplest possible case. Write down what VXN 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 VXN 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 VXN 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 VXN

In research: VXN 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 VXN 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: VXN is common in secondary-school and first-year university syllabi. It links to neighbouring topics Genes on human chromosome 8, Uncharacterized proteins, so understanding it makes those chapters shorter.
In everyday life: Look for VXN 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 VXN in 20 minutes

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

Frequently asked questions

What is VXN in simple terms?

Vexin is a protein encoded by VXN gene. VXN is found to be highly expressed in regions of the brain and spinal cord.

Why does VXN 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 VXN?

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 VXN.

VXN