science

MASA syndrome

MASA 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 MASA syndrome rather than just read about it. In short: MASA syndrome is a rare X-linked recessive neurological disorder on the L1 disorder spectrum belonging in the group of hereditary spastic paraplegias a paraplegia known to increase stiffness spasticity in the lower limbs. This syndrome also has two other names, CRASH syndrome and Gareis-Mason syndrome.

Key takeaways

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

Reference excerpt

MASA syndrome is a rare X-linked recessive neurological disorder on the L1 disorder spectrum belonging in the group of hereditary spastic paraplegias a paraplegia known to increase stiffness spasticity in the lower limbs. This syndrome also has two other names, CRASH syndrome and Gareis-Mason syndrome.

Signs and symptoms The acronym "MASA" stands for the four main signs and symptoms associated with the syndrome: (1) mental retardation (mild to moderate intellectual disability), (2) aphasia (delayed onset of speech), (3) shuffling gait, and (4) adducted thumbs characterized by cleft palate, microcephaly, and dysmyelination. Affected males may also have a variable dilatation (widening) of the third heart ventricle. MASA has five other factors including hydrocephalus. The build-up is often caused by an obstruction that prevents proper fluid drainage. Spasticity of the lower limbs, causing the muscles to stiffen or tighten, preventing normal fluid movement. Aphasia, which is when someone loses the ability to understand or express speech, due to brain damage. Seizures, an abrupt, uncontrolled disturbance in the brain. Lastly, agenesis of the corpus callosum, a rare congenital disorder. It is characterized by a partial or complete absence (agenesis) of an area of the brain that connects the two cerebral hemispheres.

Genetics MASA syndrome has been associated with variants in the L1CAM gene which is an axonal glycoprotein that is essential for normal development of the central and peripheral nervous systems during the fetal period and postnatally. The symptoms are typically more intensive in males, due to the fact that males inherit only one X chromosome so a mutation in that one chromosome would cause the condition. Females are less likely to be affected because they have two X chromosomes. The prevalence is approximately 1 in 30,000 males. Fathers cannot pass the chromosomes to their sons, but only to their female offspring.

Diagnosis A diagnosis can be made when the clinical features have been identified, mainly the four common signs and symptoms. This can then be confirmed by single-gene sequencing, where the L1CAM gene is examined for any possible variations. A diagnostic test prior-to-birth is possible and very reliable when the mother is a carrier of the diseased allele. First, it's necessary to determine the fetus' sex and then study the X-chromosomes inherited from the mother. The probability of transferring the variant X-chromosome to the descendants is 50% regardless of the sex of the fetus (as illustrated by the figure). Male descendants who inherit the varied X-chromosome will express the symptoms of the syndrome, on the other hand females who inherit the varied X-chromosome will become carriers of the mutated gene and will not show any symptoms or clinical features of the syndrome.

Treatment As of now, the only treatment for this disease is expertise in pediatrics, child neurology, neurosurgery, rehabilitation, and medical genetics. As some parts of the body can be damaged through time to time it can be useful to have the expertise to identify what other ways they can help for the complete health of the child.

Previous cases The first case of the MASA Syndrome was found in a boy in Asia. The patient was a 10-year-old boy with symptoms like, mild intellectual disability, bilateral adducted thumbs and corpus callosum hypoplasia. His family did not have any history with MASA syndrome. There is not just one specific doctor or scientist for this disorder. Since the L1 syndrome is composed of many X-linked disorders, more than one doctor or scientist may find the disorder in a person. Most of the doctors who find the disorder are Neuroscientists and some Pediatric Neurology specialists.

References

External links

MASA syndrome at NIH's Office of Rare Diseases GeneReview/NIH/UW entry on L1 Syndrome

Illustrations

Worked examples

Example 1 — a first encounter with MASA syndrome

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

In research: MASA 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 MASA 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: MASA syndrome is common in secondary-school and first-year university syllabi. It links to neighbouring topics Rare syndromes, Syndromes affecting the nervous system, Syndromes with intellectual disabilities, so understanding it makes those chapters shorter.
In everyday life: Look for MASA 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 MASA syndrome in 20 minutes

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

Frequently asked questions

What is MASA syndrome in simple terms?

Why does MASA 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 MASA 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 MASA syndrome.