biology

WDR45

WDR45 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 WDR45 rather than just read about it. In short: WD repeat domain phosphoinositide-interacting protein 4 (WIPI-4) is a protein that in humans is encoded by the WDR45 gene. Mutations in this gene cause a distinct form of neurodegeneration with brain iron accumulation (NBIA) called beta-propeller protein-associated neurodegeneration (BPAN).

Key takeaways

WDR45 belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect WDR45 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of WDR45 from memory before moving on to harder problems.

Reference excerpt

WD repeat domain phosphoinositide-interacting protein 4 (WIPI-4) is a protein that in humans is encoded by the WDR45 gene. Mutations in this gene cause a distinct form of neurodegeneration with brain iron accumulation (NBIA) called beta-propeller protein-associated neurodegeneration (BPAN).

Function WIPI-4 is a member of the WD repeat protein family. WD repeats are minimally conserved regions of approximately 40 amino acids typically bracketed by gly-his and trp-asp (GH-WD), which may facilitate formation of heterotrimeric or multiprotein complexes. Members of this family are involved in a variety of cellular processes, including cell cycle progression, signal transduction, apoptosis, and gene regulation. This gene WDR45 has a pseudogene at chromosome 4q31.3. Multiple alternatively spliced transcript variants encoding distinct isoforms have been found for this gene, but the biological validity and full-length nature of some variants have not been determined.

Role in disease De novo loss of function mutations in WDR45 were identified by exome sequencing in 20 patients with progressive neurodegeneration and evidence of iron on brain MRI scans. The mutations cause an X-linked dominant form of brain iron accumulation disorder now called Beta-propeller protein-associated neurodegeneration (BPAN). A name for the disease before the gene was identified was called static encephalopathy of childhood with neurodegeneration in adulthood (SENDA), though this term is no longer used. BPAN typically causes developmental delay and epilepsy from early childhood. An unusual feature experienced by many is a tendency to overeat without feeling full. Diagnosis might be suggested by the combination of developmental delay, epilepsy, and no satiety response. A pattern of abnormality on MRI brain scans shows early swelling of the basal ganglia (globus pallidus and substantia nigra) and dentate nucleus, with later accumulation of iron in the globus pallidus and substantia nigra. Diagnosis is usually established by genetic testing. There are no current treatments for BPAN, though medications and therapies can be used to treat symptoms.

Illustrations

Worked examples

Example 1 — a first encounter with WDR45

Start with the simplest possible case. Write down what WDR45 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 WDR45 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 WDR45 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 WDR45

In research: WDR45 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 WDR45 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: WDR45 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Genes on human chromosome X, Human chromosome X gene stubs, so understanding it makes those chapters shorter.
In everyday life: Look for WDR45 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 WDR45 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what WDR45 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 WDR45 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is WDR45 in simple terms?

Why does WDR45 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 WDR45?

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 WDR45.