biology

Sanjad–Sakati syndrome

Sanjad–Sakati 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 Sanjad–Sakati syndrome rather than just read about it. In short: Sanjad–Sakati syndrome (Middle East syndrome) is a rare autosomal recessive genetic condition seen in offspring of Middle Eastern origin. It was first described in Saudi Arabia, but has been seen in Qatari, Kuwaiti, Omani and other children from the Middle East as well as elsewhere.

Key takeaways

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

Reference excerpt

Sanjad–Sakati syndrome (Middle East syndrome) is a rare autosomal recessive genetic condition seen in offspring of Middle Eastern origin. It was first described in Saudi Arabia, but has been seen in Qatari, Kuwaiti, Omani and other children from the Middle East as well as elsewhere. The condition is caused by mutations or deletions in the TBCE gene of chromosome 1. The condition is characterised by a triad of growth retardation and intellectual disability, hypoparathyroidism and dysmorphism.

Presentation Children with the Sanjad–Sakati syndrome have a triad of hypoparathyroidism (with episodes of hypocalcemia, hypocalcemic tetany and hypocalcemic seizures), severe intellectual disability and dysmorphism. Typically, children with this syndrome are born low-birth-weight due to intrauterine growth retardation. At birth, there is dysmorphism, which is later typified into the features described below. The child is stunted, often with demonstrable growth hormone deficiency and has moderate to severe intellectual disability, mainly as a consequence of repeated seizures brought on by the low blood ionic calcium levels. The immuno-reactive parathormone levels are low to undetectable, with low calcium and high phosphate levels in the blood.

Dysmorphism Dysmorphism is most evident on the face, with the following features:

Long narrow face Deep-set, small eyes Beaked nose Large, floppy ears Small head (microcephaly) Thin lips with a long philtrum Small jaw (micrognathia)

Other features Other features include:

Stunting Small hands and feet with long, tapering fingers and clinodactyly Dental anomalies in the form of malalignment and malocclusion In another study of six patients, there were low levels of IGF-1 and markedly retarded bone age.

Genetics This disorder is caused by an abnormality of the TBCE gene, the locus for which is on chromosome 1q42.3. The locus is a 230 kb region of gene with identified deletions and mutations in affected individuals. There are rare cases of the disorder not being due to a TBCE gene abnormality.

Management Management is mainly supportive by controlling seizures and blood calcium levels.

History First reported from Saudi Arabia in 1988, Sanjad–Sakati syndrome, also known as Hypoparathyroidism-Retardation-Dysmorphism (HRD) syndrome, or less commonly as the Middle East syndrome, is a very rare genetically inherited disorder seen in the Middle East and children of Middle Eastern origin elsewhere in the world. The condition is named after Sami A. Sanjad and Nadia Awni Sakati.

References

External links

Illustrations

Worked examples

Example 1 — a first encounter with Sanjad–Sakati syndrome

Start with the simplest possible case. Write down what Sanjad–Sakati 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 Sanjad–Sakati 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 Sanjad–Sakati 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 Sanjad–Sakati syndrome

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

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

Frequently asked questions

What is Sanjad–Sakati syndrome in simple terms?

Why does Sanjad–Sakati 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 Sanjad–Sakati 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 Sanjad–Sakati syndrome.