biology

SPART

SPART 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 SPART rather than just read about it. In short: Spartin is a protein that in humans is encoded by the SPART gene (previously SPG20). This gene encodes a protein that contains a MIT (Microtubule Interacting and Trafficking molecule) domain.

Key takeaways

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

Reference excerpt

Spartin is a protein that in humans is encoded by the SPART gene (previously SPG20). This gene encodes a protein that contains a MIT (Microtubule Interacting and Trafficking molecule) domain. This protein may be involved in endosomal trafficking, microtubule dynamics, or both functions. Spartin loss has been associated to mitochondrial dysfunction, impaired complex I activity and altered pyruvate metabolism. Frameshift mutations associated with this gene cause autosomal recessive spastic paraplegia 20 (Troyer syndrome). Troyer syndrome (SPG20) is a complicated type of hereditary spastic paraplegias (HSPs). HSP is a category of neurological disorder characterized by spasticity and muscle weakness in the lower limbs.

Background The original description of this gene mutation and associated symptoms were described in 1967. This mutation is commonly found in high frequency with the Amish population. Newer studies have found that the mutation is not isolated to the Amish population, but also resides in the Omani population.

Presentation This syndrome is not only characterized by spasticity and weakness in the lower limbs, but also with dysarthria, mental retardation or mild developmental delay, and muscle wasting or muscle atrophy.

Physical Individuals appear to have difficulty walking, and report a clumsy, spastic gait which worsens over time. Some additional common physical features include overgrowth of the jaw bone, hammer toes, hand and feet abnormalities, and pes cavus.

Cognitive Cognitive challenges, including developmental delay and difficulty with performance in school, may affect individuals with this syndrome.

Neurologic Neurologic examination of individuals with this mutation may show dysmetria in the upper extremities, hyperreflexia, distal amyotrophy and ankle clonus, in addition to spasticity, weakness and dysarthria.

Diagnostic Imaging The cerebellar vermis may present with mild atrophy and a loss of white matter volume.

Through Lifespan Facial dysmorphism and subtle skeletal features are common in younger children. The condition progressively worsens, as spasticity and distal amyotrophy symptoms are revealed more in teenage years. SPART expression in the adult is relatively modest, however it is widespread in the nervous system. Longitudinal comparison of magnetic resonance imaging concluded that there was a progression of the syndrome; thus, the condition appears to worsen over time.

References

External links GeneReviews/NCBI/NIH/UW entry on Troyer Syndrome **

Illustrations

Worked examples

Example 1 — a first encounter with SPART

Start with the simplest possible case. Write down what SPART 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 SPART 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 SPART 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 SPART

In research: SPART 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 SPART 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: SPART is common in secondary-school and first-year university syllabi. It links to neighbouring topics Genes on human chromosome 13, Human chromosome 13 gene stubs, so understanding it makes those chapters shorter.
In everyday life: Look for SPART 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 SPART in 20 minutes

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

Frequently asked questions

What is SPART in simple terms?

Spartin is a protein that in humans is encoded by the SPART gene (previously SPG20). This gene encodes a protein that contains a MIT (Microtubule Interacting and Trafficking molecule) domain.

Why does SPART 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 SPART?

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 SPART.