biology

Hilpda

Hilpda 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 Hilpda rather than just read about it. In short: Hypoxia inducible lipid droplet-associated (Hilpda, also known as C7orf68 and HIG-2) is a protein that in humans is encoded by the HILPDA gene. Discovery HILPDA was originally discovered in a screen to identify new genes that are activated by low oxygen pressure (hypoxia) in human cervical cancer cells.

Key takeaways

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

Reference excerpt

Hypoxia inducible lipid droplet-associated (Hilpda, also known as C7orf68 and HIG-2) is a protein that in humans is encoded by the HILPDA gene.

Discovery HILPDA was originally discovered in a screen to identify new genes that are activated by low oxygen pressure (hypoxia) in human cervical cancer cells. The protein consists of 63 amino acids in humans and 64 amino acids in mice.

Expression HILPDA is produced by numerous cells and tissues, including cancer cells, immune cells, fat cells, and liver cells. Low oxygen pressure (hypoxia), fatty acids, and beta-adrenergic agonists stimulate HILPDA expression.

Function Nearly all cells have the ability to store excess energy as fat in special structures in the cell called lipid droplets. The formation and breakdown of lipid droplets is controlled by various enzymes and lipid droplet-associated proteins. One of the lipid droplet-associated proteins is HILPDA. HILPDA acts as a regulatory signal that blocks the breakdown of the fat stores in cells when the external fat supply is high or the availability of oxygen is low. In cells, HILPDA is located in the endoplasmic reticulum and around lipid droplets. Gain and loss-of-function studies have shown that HILPDA promotes fat storage in cancer cells, macrophages and liver cells. This effect is at least partly achieved by suppressing triglyceride breakdown by inhibiting the enzyme adipose triglyceride lipase. The binding of HILPDA to adipose triglyceride lipase occurs via the conserved N-terminal portion of HILPDA, which is similar to a region in the G0S2 protein.

Clinical significance The deficiency of HILPDA in mice that are prone to develop atherosclerosis led to a reduction in atherosclerotic plaques, suggesting that HILPDA may be a potential therapeutic target for atherosclerosis. In addition, HILPDA may be targeted for the treatment of non-alcoholic fatty liver disease.

References

Worked examples

Example 1 — a first encounter with Hilpda

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

In research: Hilpda 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 Hilpda 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: Hilpda is common in secondary-school and first-year university syllabi. It links to neighbouring topics Proteins, so understanding it makes those chapters shorter.
In everyday life: Look for Hilpda 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 Hilpda in 20 minutes

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

Frequently asked questions

What is Hilpda in simple terms?

Hypoxia inducible lipid droplet-associated (Hilpda, also known as C7orf68 and HIG-2) is a protein that in humans is encoded by the HILPDA gene. Discovery HILPDA was originally discovered in a screen to identify new genes that are activated by low oxygen pressure (hypoxia) in human cervical cancer c…

Why does Hilpda 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 Hilpda?

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 Hilpda.