biology

NPAS3

NPAS3 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 NPAS3 rather than just read about it. In short: NPAS3 or Neuronal PAS domain protein 3 is a brain-enriched transcription factor belonging to the bHLH-PAS superfamily of transcription factors, the members of which carry out diverse functions, including circadian oscillations, neurogenesis, toxin metabolism, hypoxia, and tracheal development. NPAS3 contains a basic helix-loop-helix structural motif and two PAS domain, like the other proteins in the superfamily.

Key takeaways

NPAS3 belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect NPAS3 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NPAS3 from memory before moving on to harder problems.

Reference excerpt

NPAS3 or Neuronal PAS domain protein 3 is a brain-enriched transcription factor belonging to the bHLH-PAS superfamily of transcription factors, the members of which carry out diverse functions, including circadian oscillations, neurogenesis, toxin metabolism, hypoxia, and tracheal development. NPAS3 contains a basic helix-loop-helix structural motif and two PAS domain, like the other proteins in the superfamily. It functions as an heterodimer by binding ARNT2, another member of the bHLH-PAS superfamily.

Function NPAS3 harbors the largest cluster of human accelerated regions, suggesting it may have played a key role in human evolution. Among this accelerated elements, HAR202 is particularly fascinating due to its differential activity between modern humans and archaic species, even though it has only been reported in animal reporter assays. From the first set of human accelerated regions described in 2006, NPAS3 locus overlaps one of the most accelerated sequences, HAR21 . NPAS1 and NPAS3-deficient mice display behavioral abnormalities typical to the animal models of schizophrenia. Targeting the gene in astrocytes leads to autistic-like behaviours such as reduced vocalization and socialization. According to the same study, NPAS1 and NPAS3 disruption leads to reduced expression of reelin, which is also consistently found to be reduced in the brains of human patients with schizophrenia and psychotic bipolar disorder. Recent advances in mouse models have further characterized NPAS3 function and identified key roles in astrogenesis, adult neurogenesis and in inhibitory interneurons differentiation.

Clinical significance Disruption of NPAS3 was found in one family affected by schizophrenia and NPAS3 gene is thought to be associated with psychiatric illness and learning disability. In a genetic study of several hundred subjects conducted in 2008, interacting haplotypes at the NPAS3 locus were found to affect the risk of schizophrenia and bipolar disorder. In a pharmacogenetical study, polymorphisms in NPAS3 gene were highly associated with response to iloperidone, a proposed atypical antipsychotic.

References

Illustrations

Worked examples

Example 1 — a first encounter with NPAS3

Start with the simplest possible case. Write down what NPAS3 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 NPAS3 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 NPAS3 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 NPAS3

In research: NPAS3 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 NPAS3 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: NPAS3 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Biology of bipolar disorder, Genes on human chromosome 14, Human chromosome 14 gene stubs, so understanding it makes those chapters shorter.
In everyday life: Look for NPAS3 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 NPAS3 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NPAS3 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 NPAS3 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NPAS3 in simple terms?

Why does NPAS3 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 NPAS3?

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 NPAS3.