biology

MYC

MYC 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 MYC rather than just read about it. In short: MYC proto-oncogene, bHLH transcription factor is a protein that in humans is encoded by the MYC gene which is a member of the Myc family of transcription factors. The protein contains basic helix-loop-helix (bHLH) structural motif.

MYC — main illustration — MYC — illustration

Key takeaways

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

Reference excerpt

MYC proto-oncogene, bHLH transcription factor is a protein that in humans is encoded by the MYC gene which is a member of the Myc family of transcription factors. The protein contains basic helix-loop-helix (bHLH) structural motif.

Function

This gene is a proto-oncogene and encodes a nuclear phosphoprotein that plays a role in cell cycle progression, apoptosis and cellular transformation. The encoded protein forms a heterodimer with the related transcription factor MAX. This complex binds to the E box DNA consensus sequence and regulates the transcription of specific target genes. Amplification of this gene is frequently observed in numerous human cancers. Translocations involving this gene are associated with Burkitt lymphoma and multiple myeloma in human patients. There is evidence to show that translation initiates both from an upstream, in-frame non-AUG (CUG) and a downstream AUG start site, resulting in the production of two isoforms with distinct N-termini. [provided by RefSeq, Aug 2017].

As a drug target Under normal circumstances, c-Myc through its bHLHZip domain heterodimerizes with other transcription factors such as MAD, MAX, and MNT. Myc/Max dimers activate gene transcription, while Mad/Max and Mnt/Max dimers inhibit the activity of Myc. c-MYC is over expressed in the majority of human cancers and in cancers where it is overexpressed, it drives proliferation of cancer cells. A recombinant form of c-Myc called Omomyc in which four residues are mutated has been produced. Omomyc heterodimerizes with c-Myc and inhibits c-Myc transcriptional activity. When the mouse cancer cell line NIH3T3 is treated with Omomyc, it inhibits proliferation. In a mouse model of cancer in which cancer cells were genetically engineered to conditionally express Omomyc, Omomyc triggered tumor regression which was accompanied by reduced proliferation and increased apoptosis of the tumor tissue. The Omomyc displays high affinity for MAX (Myc-associated protein X) and for enhancer box element CACGTG DNA sequences, that result in the uncoupling of cellular proliferation from normal growth factor regulation and contribute to many of the phenotypic hallmarks of cancer. The recombinantly produced Omomyc miniprotein has been developed as a drug (OMO-103) and is currently in clinical trials.

References

Illustrations

Worked examples

Example 1 — a first encounter with MYC

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

In research: MYC 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 MYC 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: MYC is common in secondary-school and first-year university syllabi. It links to neighbouring topics Genes on human chromosome 8, Human chromosome 8 gene stubs, Oncogenes, so understanding it makes those chapters shorter.
In everyday life: Look for MYC 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.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study MYC in 20 minutes

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

Frequently asked questions

What is MYC in simple terms?

Why does MYC 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 MYC?

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 MYC.

MYC