biology

Jackson–Weiss syndrome

Jackson–Weiss 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 Jackson–Weiss syndrome rather than just read about it. In short: Jackson–Weiss syndrome (JWS) is a genetic disorder characterized by foot abnormalities and the premature fusion of certain bones of the skull (craniosynostosis), which prevents further growth of the skull and affects the shape of the head and face. This genetic disorder can also sometimes cause intellectual disability and crossed eyes.

Key takeaways

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

Reference excerpt

Jackson–Weiss syndrome (JWS) is a genetic disorder characterized by foot abnormalities and the premature fusion of certain bones of the skull (craniosynostosis), which prevents further growth of the skull and affects the shape of the head and face. This genetic disorder can also sometimes cause intellectual disability and crossed eyes. It was characterized in 1976.

Signs and symptoms Many of the characteristic facial features (among other) of Jackson–Weiss syndrome result from the premature fusion of the skull bones. The following are some of the more common, such as:

Preaxial foot polydactyl Tarsal synostosis Frontal bossing Proptosis Craniosynostosis Midfacial hypoplasia Acrocephaly Flat occiput Ocular hypertelorism Downslanted palpebral fissures Ptosis Strabismus Flat nasal bridge Maxillary hypoplasia Cleft palate Malformed ears

Genetics

Mutations in the FGFR2 gene cause Jackson–Weiss syndrome. The FGFR2 gene produces a protein called fibroblast growth factor receptor 2, which occurs in chromosome number 10. Among its multiple functions, this protein signals immature cells to become bone cells in a developing embryo. A mutation in a specific part of the FGFR2 gene alters the protein and causes prolonged signaling, which promotes the premature fusion of bones in the skull and feet, this condition is inherited in an autosomal dominant pattern. Autosomal dominant means one copy of the altered gene in each cell is sufficient to cause the disorder.

Diagnosis The diagnosis of Jackson–Weiss syndrome in an individual suspected of having the condition is done via the following:

Genetic testing Clinical presentation

Differential diagnosis The DDx for this condition includes metopic synostosis, as well as Lambdoida synostosis.

Treatment

Treatment for Jackson–Weiss syndrome can be done through surgery for some facial features and feet. Secondary complications such as hydrocephalus or cognitive impairment, can be averted via prompt surgery.

Epidemiology In terms of epidemiology, Jackson–Weiss syndrome is a rare genetic disorder; the overall contribution of FGFR mutation to the condition is not clear.

References

Further reading Disorders, the National Organization for Rare, ed. (2003). NORD guide to rare disorders. Philadelphia: Lippincott Williams & Wilkins. ISBN 9780781730631. Retrieved 14 December 2016. Zitelli, Basil J.; McIntire, Sara C; Nowalk, Andrew J (2012). Zitelli and Davis' atlas of pediatric physical diagnosis (6th ed.). Philadelphia, PA: Saunders/Elsevier. ISBN 978-0323079327. Retrieved 14 December 2016.

External links

Illustrations

Worked examples

Example 1 — a first encounter with Jackson–Weiss syndrome

Start with the simplest possible case. Write down what Jackson–Weiss 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 Jackson–Weiss 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 Jackson–Weiss 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 Jackson–Weiss syndrome

In research: Jackson–Weiss 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 Jackson–Weiss 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: Jackson–Weiss syndrome is common in secondary-school and first-year university syllabi. It links to neighbouring topics Autosomal dominant disorders, Cell surface receptor deficiencies, Rare syndromes, so understanding it makes those chapters shorter.
In everyday life: Look for Jackson–Weiss 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 Jackson–Weiss syndrome in 20 minutes

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

Frequently asked questions

What is Jackson–Weiss syndrome in simple terms?

Why does Jackson–Weiss 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 Jackson–Weiss 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 Jackson–Weiss syndrome.