biology

Mir-145

Mir-145 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-145 rather than just read about it. In short: In molecular biology, mir-145 microRNA is a short RNA molecule that in humans is encoded by the MIR145 gene. MicroRNAs function to regulate the expression levels of other genes by several mechanisms.

Key takeaways

Mir-145 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-145 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Mir-145 from memory before moving on to harder problems.

Reference excerpt

In molecular biology, mir-145 microRNA is a short RNA molecule that in humans is encoded by the MIR145 gene. MicroRNAs function to regulate the expression levels of other genes by several mechanisms.

Targets MicroRNAs are involved in down-regulation of a variety of target genes. Götte et al. have shown that experimental over-expression of mir-145 down-regulates the junctional cell adhesion molecule JAM-A as well as the actin bundling protein fascin in breast cancer and endometriosis cells, resulting in a reduction of cell motility. Larsson et al. showed that miR-145 targets the 3' UTR of the FLI1 gene, a finding that was later supported by Zhang et al.

Role in cancer miR-145 is hypothesised to be a tumor suppressor. miR-145 has been shown to be down-regulated in breast cancer. miR-145 is also involved in colon cancer and acute myeloid leukemia.

References

Illustrations

Worked examples

Example 1 — a first encounter with Mir-145

Start with the simplest possible case. Write down what Mir-145 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-145 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-145 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-145

In research: Mir-145 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-145 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-145 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Genes on human chromosome 5, MicroRNA, Tumor suppressor genes, so understanding it makes those chapters shorter.
In everyday life: Look for Mir-145 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-145 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Mir-145 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-145 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Mir-145 in simple terms?

In molecular biology, mir-145 microRNA is a short RNA molecule that in humans is encoded by the MIR145 gene. MicroRNAs function to regulate the expression levels of other genes by several mechanisms.

Why does Mir-145 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-145?

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-145.