biology

Smith–Kingsmore syndrome

Smith–Kingsmore 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 Smith–Kingsmore syndrome rather than just read about it. In short: Smith–Kingsmore syndrome is a rare genetic disorder that is caused by a gain-of-function mutation in a mTOR gene. The facial features of this syndrome are triangular face with a pointed chin, frontal bossing, hypertelorism, eyes with downslanting palpebral fissures, a flat nasal bridge, a long philtrum.

Key takeaways

Smith–Kingsmore 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 Smith–Kingsmore syndrome to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Smith–Kingsmore syndrome from memory before moving on to harder problems.

Reference excerpt

Smith–Kingsmore syndrome is a rare genetic disorder that is caused by a gain-of-function mutation in a mTOR gene. The facial features of this syndrome are triangular face with a pointed chin, frontal bossing, hypertelorism, eyes with downslanting palpebral fissures, a flat nasal bridge, a long philtrum.

Presentation The signs of this disease are: Very frequent:

Intellectual disability Macrocephaly Frequent:

Abnormal facial shape Abnormality of speech Curly hair Seizure Frontal bossing Ventriculomegaly Occasional:

Autistic Behaviour Cafe-au-lait spot Gait Disturbance Hypertelorism Hypotonia Open mouth Long philtrum Polymicrogyria Prominient forehead Very rare:

Downslanted palpebral fissures Depressed nasal bridge Decreased circulating IgA level

Cause The cause of SKS is gain-of-function mutation in a gene MTOR. This disease is inherited in autosomal dominant fashion, but most of the times it is de-novo mutation.

Diagnosis SKS is a rare condition so many physicians aren't familiar with. A diagnosis of SKS is suspected based upon the identification of symptoms, a patient and family history and a thorough clinical evaluation. SKS can be confirmed with the detection of a germline or mosaic mutation in the MTOR gene.

Frequency Frequency of this disease is unknown, but all ethnic groups are equally affected.

Treatment There is no cure for SKS, but management of some symptoms can be achieved.

History SKS was first described by Dr Smith, L.D et al. in 2013.

References

Illustrations

Smith–Kingsmore syndrome: Four patients showing characteristic facial signs of Smith–Kingsmore syndrome — Four patients showing characteristic facial signs of Smith–Kingsmore syndrome

Worked examples

Example 1 — a first encounter with Smith–Kingsmore syndrome

Start with the simplest possible case. Write down what Smith–Kingsmore 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 Smith–Kingsmore 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 Smith–Kingsmore 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 Smith–Kingsmore syndrome

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

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

Frequently asked questions

What is Smith–Kingsmore syndrome in simple terms?

Why does Smith–Kingsmore 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 Smith–Kingsmore 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 Smith–Kingsmore syndrome.