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biology

ID1

ID1 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 ID1 rather than just read about it. In short: DNA-binding protein inhibitor ID-1 is a protein that in humans is encoded by the ID1 gene. Function The protein encoded by this gene is a helix-loop-helix (HLH) protein that can form heterodimers with members of the basic HLH family of transcription factors.

ID1 — main illustration
ID1 — illustration

Key takeaways

  • ID1 belongs to biology; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect ID1 to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of ID1 from memory before moving on to harder problems.

Reference excerpt

DNA-binding protein inhibitor ID-1 is a protein that in humans is encoded by the ID1 gene.

Function The protein encoded by this gene is a helix-loop-helix (HLH) protein that can form heterodimers with members of the basic HLH family of transcription factors. The encoded protein has no DNA binding activity and therefore can inhibit the DNA binding and transcriptional activation ability of basic HLH proteins with which it interacts. This protein may play a role in cell growth, senescence, and differentiation. Two transcript variants encoding different isoforms have been found for this gene.

Interactions ID1 has been shown to interact weakly with MyoD but very tightly with ubiquitously expressed E proteins. E proteins heterodimerize with tissue restricted bHLH proteins such as Myod, NeuroD, etc. to form active transcription complexes so by sequestering E proteins, Id proteins can inhibit tissue restricted gene expression in multiple cell lineages using the same biochemical mechanism. Other interacting partners include CASK.

Clinical significance ID1 can be used to mark endothelial progenitor cells which are critical to tumor growth and angiogenesis. Targeting ID1 results in decreased tumor growth. ID1 has been shown to be targeted by cannabidiol in certain gliomas and breast cancers.

See also Inhibitor of DNA-binding protein

References

Further reading

External links ID1+protein,+human at the U.S. National Library of Medicine Medical Subject Headings (MeSH) Overview of all the structural information available in the PDB for UniProt: P20067 (Mouse DNA-binding protein inhibitor ID-1) at the PDBe-KB.

This article incorporates text from the United States National Library of Medicine, which is in the public domain.

Illustrations

ID1 illustration
ID1 illustration
ID1 illustration
ID1 illustration
ID1 illustration

Worked examples

Example 1 — a first encounter with ID1

Start with the simplest possible case. Write down what ID1 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 ID1 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 ID1 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 ID1

In research
ID1 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 ID1 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
ID1 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aging-related genes, Genes on human chromosome 20, Transcription factors, so understanding it makes those chapters shorter.
In everyday life
Look for ID1 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 ID1 in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what ID1 means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain ID1 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is ID1 in simple terms?

DNA-binding protein inhibitor ID-1 is a protein that in humans is encoded by the ID1 gene. Function The protein encoded by this gene is a helix-loop-helix (HLH) protein that can form heterodimers with members of the basic HLH family of transcription factors.

Why does ID1 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 ID1?

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 ID1.

Tags

  • Aging-related genes
  • Genes on human chromosome 20
  • Transcription factors

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