biology

Liver X receptor alpha

Liver X receptor alpha 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 Liver X receptor alpha rather than just read about it. In short: Liver X receptor alpha (LXR-alpha) is a nuclear receptor protein that in humans is encoded by the NR1H3 gene (nuclear receptor subfamily 1, group H, member 3). Expression miRNA hsa-miR-613 autoregulates the human LXRα gene by targeting the endogenous LXRα through its specific miRNA response element (613MRE) within the LXRα 3′-untranslated region.

Key takeaways

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

Reference excerpt

Liver X receptor alpha (LXR-alpha) is a nuclear receptor protein that in humans is encoded by the NR1H3 gene (nuclear receptor subfamily 1, group H, member 3).

Expression miRNA hsa-miR-613 autoregulates the human LXRα gene by targeting the endogenous LXRα through its specific miRNA response element (613MRE) within the LXRα 3′-untranslated region. LXRα autoregulates its own suppression via induction of SREBP1c which upregulates miRNA has-miR-613.

Function The liver X receptors, LXRα (this protein) and LXRβ, form a subfamily of the nuclear receptor superfamily and are key regulators of macrophage function, controlling transcriptional programs involved in lipid homeostasis and inflammation. Additionally, they play an important role in the local activation of thyroid hormones via deiodinases. The inducible LXRα is highly expressed in liver, adrenal gland, intestine, adipose tissue, macrophages, lung, and kidney, whereas LXRβ is ubiquitously expressed. Ligand-activated LXRs form obligate heterodimers with retinoid X receptors (RXRs) and regulate expression of target genes containing LXR response elements. Restoration of LXR-alpha expression/function within a psoriatic lesion may help to switch the transition from psoriatic to symptomless skin.

Interactions Liver X receptor alpha has been shown to interact with EDF1 and small heterodimer partner. LXRα activates the transcription factor SREBP-1c, resulting in lipogenesis.

Link to multiple sclerosis In 2016, a study found 70% of individuals in two families with a rare form of rapidly progressing multiple sclerosis had a mutation in NR1H3. However, an analysis from The International Multiple Sclerosis Genetics Consortium using a 13-fold larger sample size could not find any evidence that the mutation in question (p.Arg415Gln) associated with multiple sclerosis, refuting these findings.

References

Illustrations

Worked examples

Example 1 — a first encounter with Liver X receptor alpha

Start with the simplest possible case. Write down what Liver X receptor alpha 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 Liver X receptor alpha 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 Liver X receptor alpha 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 Liver X receptor alpha

In research: Liver X receptor alpha 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 Liver X receptor alpha 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: Liver X receptor alpha is common in secondary-school and first-year university syllabi. It links to neighbouring topics Genes on human chromosome 11, Intracellular receptors, Transcription factors, so understanding it makes those chapters shorter.
In everyday life: Look for Liver X receptor alpha 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 Liver X receptor alpha in 20 minutes

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

Frequently asked questions

What is Liver X receptor alpha in simple terms?

Liver X receptor alpha (LXR-alpha) is a nuclear receptor protein that in humans is encoded by the NR1H3 gene (nuclear receptor subfamily 1, group H, member 3). Expression miRNA hsa-miR-613 autoregulates the human LXRα gene by targeting the endogenous LXRα through its specific miRNA response element…

Why does Liver X receptor alpha 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 Liver X receptor alpha?

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 Liver X receptor alpha.