biology

Wiedemann–Rautenstrauch syndrome

Wiedemann–Rautenstrauch syndrome 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 Wiedemann–Rautenstrauch syndrome rather than just read about it. In short: Wiedemann–Rautenstrauch (WR) syndrome (German pronunciation: [ˈviːdəman ˈʁaʊtn̩ʃtʁaʊx]), also known as neonatal progeroid syndrome, is a rare autosomal recessive progeroid syndrome. There have been over 30 cases of WR.

Key takeaways

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

Reference excerpt

Wiedemann–Rautenstrauch (WR) syndrome (German pronunciation: [ˈviːdəman ˈʁaʊtn̩ʃtʁaʊx]), also known as neonatal progeroid syndrome, is a rare autosomal recessive progeroid syndrome. There have been over 30 cases of WR. WR is associated with abnormalities in bone maturation, and lipids and hormone metabolism.

Presentation Affected individuals exhibit intrauterine and postnatal growth retardation, leading to short stature and an aged appearance from birth. They have physical abnormalities including a large head (macrocephaly), sparse hair, prominent scalp veins, inward-folded eyelid (entropion), widened anterior fontanelles, hollow cheeks (malar hypoplasia), general loss of fat tissues under the skin (lipoatrophy), delayed tooth eruption, abnormal hair pattern (hypotrichosis), beaked nose, mild to severe intellectual disabilities, and dysmorphism.

Genetics This condition has been associated with mutations in the POLR3A gene. This gene is located on the long arm of chromosome 10 (10q22.3). This gene encodes the largest subunit (A) of the DNA directed RNA polymerase III. This subunit includes the catalytic site of RNA polymerase III. Mutations in this gene have been associated with hypogonadotropic hypogonadism and hypomyelinating leukodystrophy with or without oligodontia.

Diagnosis

Differential diagnosis Marfan lipodystrophy syndrome (MFLS) has sometimes been confused with Wiedemann–Rautenstrauch syndrome, since the Marfanoid features are progressive and sometimes incomplete. MFLS is caused by mutations near the 3'-terminus of FBN1 that cause a deficiency of the protein hormone asprosin and progeroid-like symptoms with reduced subcutaneous white adipose tissue.

History WR was first reported by Rautenstrauch and Snigula in 1977, and the earliest reports made subsequently have been by Hans-Rudolf Wiedemann in 1979, Devos in 1981, and Rudin in 1988.

References

External links

Illustrations

Worked examples

Example 1 — a first encounter with Wiedemann–Rautenstrauch syndrome

Start with the simplest possible case. Write down what Wiedemann–Rautenstrauch syndrome 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 Wiedemann–Rautenstrauch syndrome 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 Wiedemann–Rautenstrauch syndrome 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 Wiedemann–Rautenstrauch syndrome

In research: Wiedemann–Rautenstrauch syndrome 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 Wiedemann–Rautenstrauch syndrome 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: Wiedemann–Rautenstrauch syndrome is common in secondary-school and first-year university syllabi. It links to neighbouring topics Autosomal recessive disorders, Genetic syndromes, Progeroid syndromes, so understanding it makes those chapters shorter.
In everyday life: Look for Wiedemann–Rautenstrauch syndrome 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 Wiedemann–Rautenstrauch syndrome in 20 minutes

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

Frequently asked questions

What is Wiedemann–Rautenstrauch syndrome in simple terms?

Why does Wiedemann–Rautenstrauch syndrome 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 Wiedemann–Rautenstrauch syndrome?

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 Wiedemann–Rautenstrauch syndrome.