biology

Mir-30 microRNA precursor

Mir-30 microRNA precursor 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 Mir-30 microRNA precursor rather than just read about it. In short: miR-30 microRNA precursor is a small non-coding RNA that regulates gene expression. Animal microRNAs are transcribed as pri-miRNA (primary miRNA) of varying length which in turn are processed in the nucleus by Drosha into ~70 nucleotide stem-loop precursor called pre-miRNA (precursor miRNA) and subsequently processed by the Dicer enzyme to give a mature ~22 nucleotide product.

Key takeaways

Mir-30 microRNA precursor belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Mir-30 microRNA precursor to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Mir-30 microRNA precursor from memory before moving on to harder problems.

Reference excerpt

miR-30 microRNA precursor is a small non-coding RNA that regulates gene expression. Animal microRNAs are transcribed as pri-miRNA (primary miRNA) of varying length which in turn are processed in the nucleus by Drosha into ~70 nucleotide stem-loop precursor called pre-miRNA (precursor miRNA) and subsequently processed by the Dicer enzyme to give a mature ~22 nucleotide product. In this case the mature sequence comes from both the 3' (miR-30) and 5' (mir-97-6) arms of the precursor. The products are thought to have regulatory roles through complementarity to mRNA. A screen of 17 miRNAs that have been predicted to regulate a number of breast cancer associated genes found variations in the microRNAs miR-17 and miR-30c-1, these patients were noncarriers of BRCA1 or BRCA2 mutations, lending the possibility that familial breast cancer may be caused by variation in these miRNAs. Members of the miR-30 family have been found to be highly expressed in heart cells.

Targets of miR-30 It has been shown that the integrin ITGB3 and the ubiquitin conjugating E2 enzyme UBC9 are downregulated by miR-30. It has also been suggested that the TP53 protein may be a target of miR-30c and miR-30e. An immunoblot analysis revealed that p53 expression levels were elevated upon knockdown of miR-30c and miR-30e.

References

Further reading Agrawal R, Tran U, Wessely O (December 2009). "The miR-30 miRNA family regulates Xenopus pronephros development and targets the transcription factor Xlim1/Lhx1". Development. 136 (23): 3927–36. doi:10.1242/dev.037432. PMC 2778741. PMID 19906860. Su S, Shao J, Zhao Q, et al. (May 2017). "MiR-30b Attenuates Neuropathic Pain by Regulating Voltage-Gated Sodium Channel Nav1.3 in Rats". Front Mol Neurosci. 10: 126. doi:10.3389/fnmol.2017.00126. PMC 5418349. PMID 28529474.

External links

Page for mir-30 microRNA precursor at Rfam

Illustrations

Worked examples

Example 1 — a first encounter with Mir-30 microRNA precursor

Start with the simplest possible case. Write down what Mir-30 microRNA precursor 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 Mir-30 microRNA precursor 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 Mir-30 microRNA precursor 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 Mir-30 microRNA precursor

In research: Mir-30 microRNA precursor 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 Mir-30 microRNA precursor 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: Mir-30 microRNA precursor is common in secondary-school and first-year university syllabi. It links to neighbouring topics MicroRNA, Molecular and cellular biology stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Mir-30 microRNA precursor 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 Mir-30 microRNA precursor in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Mir-30 microRNA precursor 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 Mir-30 microRNA precursor out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Mir-30 microRNA precursor in simple terms?

Why does Mir-30 microRNA precursor 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 Mir-30 microRNA precursor?

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 Mir-30 microRNA precursor.