biology

MYO7A

MYO7A 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 MYO7A rather than just read about it. In short: Myosin VIIA is protein that in humans is encoded by the MYO7A gene. Myosin VIIA is a member of the unconventional myosin superfamily of proteins.

Key takeaways

MYO7A belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect MYO7A to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of MYO7A from memory before moving on to harder problems.

Reference excerpt

Myosin VIIA is protein that in humans is encoded by the MYO7A gene. Myosin VIIA is a member of the unconventional myosin superfamily of proteins. Myosins are actin binding molecular motors that use the enzymatic conversion of ATP - ADP + inorganic phosphate (Pi) to provide the energy for movement. Myosins are mechanochemical proteins characterized by the presence of a motor domain, an actin-binding domain, a neck domain that interacts with other proteins, and a tail domain that serves as an anchor. Myosin VIIA is an unconventional myosin with the longest tail (1360 aa). The tail is expected to dimerize, resulting in a two-headed molecule. Unconventional myosins have diverse functions in eukaryotic cells and are primarily thought to be involved in the movement or linkage of intra-cellular membranes and organelles to the actin cytoskeleton via interactions mediated by their highly divergent tail domains. MYO7A is expressed in a number of mammalian tissues, including testis, kidney, lung, inner ear, retina and the ciliated epithelium of the nasal mucosa.

Clinical significance Mutations in the MYO7A gene cause the Usher syndrome type 1B, a combined deafness/blindness disorder. Affected individuals are typically profoundly deaf at birth and then undergo progressive retinal degeneration.

Model organisms

Model organisms have been used in the study of MYO7A function. A spontaneous mutant mouse line, called Myo7ash1-6J was generated. Male and female animals underwent a standardized phenotypic screen to determine the effects of deletion. Twenty three tests were carried out on mutant mice and ten significant abnormalities were observed. Male homozygous mutant mice displayed a decreased body weight, a decrease in body fat, improved glucose tolerance and abnormal pelvic girdle bone morphology. Homozygous mutant mice of both sex displayed various abnormalities in a modified SHIRPA test, including abnormal gait, tail dragging and an absence of pinna reflex, a decrease in grip strength, an increased thermal pain threshold, severe hearing impairment and a number of abnormal indirect calorimetry and clinical chemistry parameters.

References

External links GeneReviews/NCBI/NIH/UW entry on Usher Syndrome Type I Overview of all the structural information available in the PDB for UniProt: Q13402 (Human Unconventional myosin-VIIa) at the PDBe-KB. Overview of all the structural information available in the PDB for UniProt: P97479 (Mouse Unconventional myosin-VIIa) at the PDBe-KB.

Illustrations

Worked examples

Example 1 — a first encounter with MYO7A

Start with the simplest possible case. Write down what MYO7A 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 MYO7A 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 MYO7A 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 MYO7A

In research: MYO7A 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 MYO7A 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: MYO7A is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cytoskeleton, Genes mutated in mice, Genes on human chromosome 11, so understanding it makes those chapters shorter.
In everyday life: Look for MYO7A 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 MYO7A in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what MYO7A 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 MYO7A out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is MYO7A in simple terms?

Myosin VIIA is protein that in humans is encoded by the MYO7A gene. Myosin VIIA is a member of the unconventional myosin superfamily of proteins.

Why does MYO7A 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 MYO7A?

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 MYO7A.