science

Marshall–Smith syndrome

Marshall–Smith syndrome is a science 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 Marshall–Smith syndrome rather than just read about it. In short: Marshall-Smith syndrome, discovered in 1971 (Marshall, Graham, Scott, Boner, & Smith), is characterized by unusual accelerated skeletal maturation (usually starting before birth) and symptoms like conspicuous physical characteristics, respiratory difficulties, and intellectual disability. Cases described in the literature show a clinical variability regarding related symptoms.

Key takeaways

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

Reference excerpt

Marshall-Smith syndrome, discovered in 1971 (Marshall, Graham, Scott, Boner, & Smith), is characterized by unusual accelerated skeletal maturation (usually starting before birth) and symptoms like conspicuous physical characteristics, respiratory difficulties, and intellectual disability. Cases described in the literature show a clinical variability regarding related symptoms. For instance, respiratory difficulties are ranging from absent to severe difficulties.

Presentation The syndrome is a rare clinical disorder.

Physical Overgrowth Accelerated skeletal maturation Dysmorphic facial features Prominent eyes Bluish sclerae Coarse eyebrows Upturned nose Radiologic examination Accelerated osseous maturation Phalangeal abnormalities Tubular thinning of the long bones Skull abnormalities Mental Often associated with intellectual disability (of variable degree)

Genotype The first gene - NFIX - that could cause the syndrome has been identified. This gene is located on the short arm of chromosome 19 (19p13.1).

Diagnosis Clinical course Respiratory difficulties (like upper airway obstruction. (Note regarding clinical variability: respiratory difficulties might be absent.) Pneumonia Failure to thrive Psychomotor retardation Respiratory complications are often cause of death in early infancy.

Differential diagnosis Marshall–Smith syndrome is not to be confused with:

Marshall syndrome Malan syndrome Weaver syndrome (WSS)

Terminology

Translated English: Marshall–Smith syndrome Español: Síndrome de Marshall–Smith Français: Le syndrome de Marshall–Smith Italiano: Sindrome di Marshall–Smith Nederlands: Marshall–Smithsyndroom, syndroom van Marshall–Smith Polski: Zespół Marshalla–Smitha, Zespół Marshalla i Smitha Русский: Синдром Маршалла–Смита

References

Worked examples

Example 1 — a first encounter with Marshall–Smith syndrome

Start with the simplest possible case. Write down what Marshall–Smith syndrome claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Marshall–Smith 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 Marshall–Smith 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 Marshall–Smith syndrome

In research: Marshall–Smith syndrome appears in science 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 Marshall–Smith 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: Marshall–Smith syndrome is common in secondary-school and first-year university syllabi. It links to neighbouring topics Rare syndromes, Syndromes affecting bones, Syndromes with intellectual disabilities, so understanding it makes those chapters shorter.
In everyday life: Look for Marshall–Smith 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 Marshall–Smith syndrome in 20 minutes

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

Frequently asked questions

What is Marshall–Smith syndrome in simple terms?

Why does Marshall–Smith syndrome matter?

Because it connects several science 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 Marshall–Smith 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 Marshall–Smith syndrome.