biology

Spastic paraplegia 31

Spastic paraplegia 31 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 Spastic paraplegia 31 rather than just read about it. In short: Spastic paraplegia 31 is a rare type of hereditary spastic paraplegia which is characterized by sensation anomalies of the lower extremities. Signs and symptoms People with this condition usually start having symptoms either at childhood or in mid-adulthood (which is usually 30 years of age), these symptoms are proximal weakness of the lower extremities, brisk reflexes, and spastic gait.

Key takeaways

Spastic paraplegia 31 belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Spastic paraplegia 31 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Spastic paraplegia 31 from memory before moving on to harder problems.

Reference excerpt

Spastic paraplegia 31 is a rare type of hereditary spastic paraplegia which is characterized by sensation anomalies of the lower extremities.

Signs and symptoms People with this condition usually start having symptoms either at childhood or in mid-adulthood (which is usually 30 years of age), these symptoms are proximal weakness of the lower extremities, brisk reflexes, and spastic gait. This disorder can also manifest itself with a more complex phenotype, people with this phenotype exhibit the symptoms mentioned before and other additional ones, these include peripheral neuropathy, bulbar palsy, dysarthria, dysphagia, distal limb amyotrophy, and impaired sensation of vibration in the distal limbs. Other symptoms include problems controlling the bladder and pes cavus.

Complications The degeneration of lower motor neurons leads to paralysis of the lower limbs, and without support, might lead someone to not be able to walk.

Genetics This condition is caused by autosomal dominant mutations in the REEP1 gene, located in chromosome 2. This gene has an important role in the formation of the receptor expression-enhancing protein 1, this protein can be found in spinal cord and brain neurons. This gene provides instructions for making a protein called receptor expression-enhancing protein 1 (REEP1), which is found in neurons in the brain and spinal cord. The protein itself is located within the mitochondria, and it is important for regulating endoplasmic reticulum size, alongside determining the amount of proteins that it can process. The mutations implicated in SPG31 result in a nonfunctional and short protein that can be broken down rather quickly, thus causing a notable reduction of functional REEP1 protein.

Treatment The walking impairment can be managed with walking support and physical therapy

Diagnosis This condition can be diagnosed through whole genome sequencing (or just by sequencing the REEP1 gene), electrophysiological studies, and by examination of the symptoms presented by the individual.

Prevalence While autosomal dominant spastic paraplegias (ADSPG) like this one have a worldwide incidence of 1 in 100,000 people, this condition only accounts for 3 to 9% of ADSPG diagnosis in the world.

See also Spasticity Hereditary spastic paraplegia Hereditary sensory and autonomic neuropathy

References

Worked examples

Example 1 — a first encounter with Spastic paraplegia 31

Start with the simplest possible case. Write down what Spastic paraplegia 31 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 Spastic paraplegia 31 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 Spastic paraplegia 31 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 Spastic paraplegia 31

In research: Spastic paraplegia 31 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 Spastic paraplegia 31 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: Spastic paraplegia 31 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Autosomal dominant disorders, Rare diseases, Systemic atrophies primarily affecting the central nervous system, so understanding it makes those chapters shorter.
In everyday life: Look for Spastic paraplegia 31 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Spastic paraplegia 31” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Spastic paraplegia 31 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Spastic paraplegia 31 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 Spastic paraplegia 31 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Spastic paraplegia 31 in simple terms?

Spastic paraplegia 31 is a rare type of hereditary spastic paraplegia which is characterized by sensation anomalies of the lower extremities. Signs and symptoms People with this condition usually start having symptoms either at childhood or in mid-adulthood (which is usually 30 years of age), these…

Why does Spastic paraplegia 31 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 Spastic paraplegia 31?

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 Spastic paraplegia 31.