science

Peters-plus syndrome

Peters-plus 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 Peters-plus syndrome rather than just read about it. In short: Peters-plus syndrome or Krause–Kivlin syndrome is a hereditary syndrome defined by Peters' anomaly, dwarfism and intellectual disability. Signs and symptoms Features of this syndrome include Peters' anomaly, corneal opacity, central defect of Descemet's membrane, and shallow anterior chamber with synechiae between the iris and cornea.

Key takeaways

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

Reference excerpt

Peters-plus syndrome or Krause–Kivlin syndrome is a hereditary syndrome defined by Peters' anomaly, dwarfism and intellectual disability.

Signs and symptoms Features of this syndrome include Peters' anomaly, corneal opacity, central defect of Descemet's membrane, and shallow anterior chamber with synechiae between the iris and cornea. Craniofacial abnormalities commonly seen in patients with PPS include hypertelorism, ear malformations, micrognathia, round face and broad neck, and cleft lip and palate. Infants are commonly born small for gestational age and have delayed growth. It is associated with short limb dwarfism and mild to severe intellectual disability and autism spectrum disorder.

Cause The pattern of inheritance of Peters-plus is autosomal recessive, where both parents are heterozygous they can produce a child with the syndrome. The B3GALTL (now called B3GLCT) gene codes for the enzyme beta 3-glucosyltransferase (B3Glc-T). The beta 3-glucosyltransferase enzyme is responsible for glycosylation, the attachment of sugars to proteins, which through this modification allows for performance of a wider variety of functions. The mutations of the B3GLCT gene in affected individuals results in loss-of-function of the beta 3-glucosyltransferase enzyme. The result of this disruption in glycosylation is a change to the secondary structure of the mRNA. These mutations of the B3GLCT gene lead to the production of an abnormally short, nonfunctional version of the beta 3-glucosyltransferase (B3Glc-T) enzyme, which disrupts glycosylation. The phenotypic effects of the B3GLCT mutations result in a triad of well known phenotypes; Peters anomaly (also classified as anterior segment defects, a defect in the anterior cornea), short stature, brachydactyly, in addition to several other less frequently observed phenotypes. A study of 55 patients with Peters-plus-related phenotypes, but lacking the most common combination (Peters anomaly, short stature, and brachydactyly), revealed none of those cases displayed mutation in the B3GLCT gene. Thus PPS-like signs and symptoms, when they occur independently of each other, provide strong evidence that the B3GLCT gene mutation is in fact responsible for actual cases Peters-plus syndrome.

History Krause–van Schooneveld–Kivlin syndrome is listed as a "rare disease" by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). It was characterized in 1984 by van Schooneveld.

Illustrations

Worked examples

Example 1 — a first encounter with Peters-plus syndrome

Start with the simplest possible case. Write down what Peters-plus 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 Peters-plus 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 Peters-plus 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 Peters-plus syndrome

In research: Peters-plus 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 Peters-plus 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: Peters-plus syndrome is common in secondary-school and first-year university syllabi. It links to neighbouring topics Rare syndromes, so understanding it makes those chapters shorter.
In everyday life: Look for Peters-plus 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 Peters-plus syndrome in 20 minutes

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

Frequently asked questions

What is Peters-plus syndrome in simple terms?

Peters-plus syndrome or Krause–Kivlin syndrome is a hereditary syndrome defined by Peters' anomaly, dwarfism and intellectual disability. Signs and symptoms Features of this syndrome include Peters' anomaly, corneal opacity, central defect of Descemet's membrane, and shallow anterior chamber with s…

Why does Peters-plus 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 Peters-plus 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 Peters-plus syndrome.