biology

UNC13A

UNC13A 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 UNC13A rather than just read about it. In short: Unc-13 homolog A (C. elegans) is a protein that in humans is encoded by the UNC13A gene and in mice by the Munc13-1 gene. Function This gene encodes a member of the UNC13 family.

Key takeaways

UNC13A belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect UNC13A to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of UNC13A from memory before moving on to harder problems.

Reference excerpt

Unc-13 homolog A (C. elegans) is a protein that in humans is encoded by the UNC13A gene and in mice by the Munc13-1 gene.

Function This gene encodes a member of the UNC13 family. UNC13A plays a role in vesicle maturation during exocytosis as a target of the diacylglycerol second messenger pathway. It is involved in neurotransmitter release by acting in synaptic vesicle priming prior to vesicle fusion and participates in the activity-dependent refilling of readily releasable vesicle pool. In Drosophila melanogaster, the protein has been shown to define the vesicle release site by regulating the coupling distance between synaptic vesicles and calcium channels in cooperation with another isoform, UNC13B. It is particularly important in most glutamatergic-mediated synapses as well as GABA-mediated synapses. It plays a role in dendrite formation by melanocytes and in secretory granule priming in insulin secretion.

Protein structure Several conserved domains have been found in UNC13A. These conserved domains include three C2 domains. One C2 domain is centrally located, another is at the carboxyl end, and there is a third. In addition, there is one C1 domain, as well as Munc13 homology domains 1 (MHD1) and 2 (MHD2).

Subcellular location UNC13A is localized to the active zone of presynaptic density. It is translocated to the plasma membrane in response to phorbol ester binding.

Interaction UNC13A has been shown to interact with:

STX1A, STX1B1, DOC2A, BSN, RIMS1, RIMS2, ERC2, and RAB3A.

Clinical significance Single nucleotide polymorphisms in this gene may be associated with sporadic amyotrophic lateral sclerosis. This single nucleotide polymorphism has been discovered on chromosome 19. This variation of the single nucleotide involving UNC13A has also been implicated in frontotemporal dementia (FTD). Pathology of TDP-43 in both ALS and FTD results in a cryptic exon being expressed in UNC13A, which is exercerbated by the single nucleotide polymorphisms associated with ALS and FTD risk. This gene has also been associated with Alzheimer's disease (AD).

References

Illustrations

Worked examples

Example 1 — a first encounter with UNC13A

Start with the simplest possible case. Write down what UNC13A 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 UNC13A 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 UNC13A 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 UNC13A

In research: UNC13A 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 UNC13A 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: UNC13A is common in secondary-school and first-year university syllabi. It links to neighbouring topics Genes on human chromosome 19, Human chromosome 19 gene stubs, Human proteins, so understanding it makes those chapters shorter.
In everyday life: Look for UNC13A 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 UNC13A in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what UNC13A 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 UNC13A out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is UNC13A in simple terms?

Unc-13 homolog A (C. elegans) is a protein that in humans is encoded by the UNC13A gene and in mice by the Munc13-1 gene. Function This gene encodes a member of the UNC13 family.

Why does UNC13A 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 UNC13A?

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 UNC13A.