biology

HIDEA syndrome

HIDEA 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 HIDEA syndrome rather than just read about it. In short: HIDEA syndrome is a syndrome characterized by hypotonia, hypoventilation, intellectual disability, dysautonomia, epilepsy, and eye abnormalities. It results from mutations in both copies of the P4HTM gene on chromosome 3, which is very highly expressed in the brain and eye.

Key takeaways

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

Reference excerpt

HIDEA syndrome is a syndrome characterized by hypotonia, hypoventilation, intellectual disability, dysautonomia, epilepsy, and eye abnormalities. It results from mutations in both copies of the P4HTM gene on chromosome 3, which is very highly expressed in the brain and eye. HIDEA syndrome (OMIM #618493) was first characterized in 2019

Presentation This syndrome affects many body systems, impairing cognition, vision, breathing, and more.

Eyes Strabismus Difficulty fixing the eyes on an object

Face Facial features gradually become coarser during childhood.

Musculoskeletal system Hypotonia Planovalgus Contractures in elbow joints Interphalangeal joint hypermobility

Respiratory system Hypoventilation Obstructive and central sleep apnea Affected individuals are vulnerable to respiratory distress during infection, such as pneumonia. Respiratory evaluation, including a sleep study, as well as oxygen monitoring at night (pulse oximetry) is valuable as preventative measurements. Anesthesia is a risk for these patients because of their hypoventilation.

Nervous system P4HTM is very highly expressed throughout the brain. despite these patients having severe intellectual disability, brain MRI is normal in most patients.

Other features Dysautonomia, often including hypothermia or hyperthermia, and constipation.

Genetics This condition is caused by mutations in the Prolyl 4-hydroxylase, transmembrane (P4HTM) gene. This gene is located on the short arm of chromosome 3 (3p21.3). Within a cell, Prolyl 4-hydroxylases (P4Hs) play an important role in making collagens and also helping the cell react in the state of hypoxia (lack of oxygen). The inheritance of this condition is autosomal recessive.

Diagnosis The diagnosis may be suspected on clinical grounds. It is made by sequencing the P4HTM gene.

Management There is presently no curative treatment for HIDEA syndrome, but the management of respiratory depression with noninvasive or invasive ventilation, even intermittent, is very helpful in many patients.

Epidemiology The prevalence is not known, but this is considered to be a rare disease. Only 24 patients have been reported to date across the globe, but given its recent discovery, it is expected that there are many more patients left undiagnosed today.

History This condition was first described in 2014. The causative mutation was discovered in 2019.

References

Illustrations

Worked examples

Example 1 — a first encounter with HIDEA syndrome

Start with the simplest possible case. Write down what HIDEA 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 HIDEA 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 HIDEA 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 HIDEA syndrome

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

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

Frequently asked questions

What is HIDEA syndrome in simple terms?

Why does HIDEA 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 HIDEA 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 HIDEA syndrome.