science

Primary age-related tauopathy

Primary age-related tauopathy 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 Primary age-related tauopathy rather than just read about it. In short: Primary age-related tauopathy (PART) is a neuropathological designation introduced in 2014 to describe the neurofibrillary tangles (NFT) that are commonly observed in the brains of normally aged and cognitively impaired individuals that can occur independently of the amyloid plaques of Alzheimer's disease (AD). The term and diagnostic criteria for PART were developed by a large group of neuropathologists, spearheade…

Key takeaways

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Reference excerpt

Primary age-related tauopathy (PART) is a neuropathological designation introduced in 2014 to describe the neurofibrillary tangles (NFT) that are commonly observed in the brains of normally aged and cognitively impaired individuals that can occur independently of the amyloid plaques of Alzheimer's disease (AD). The term and diagnostic criteria for PART were developed by a large group of neuropathologists, spearheaded by Drs. John F. Crary (then at Columbia University Medical Center) and Peter T. Nelson (University of Kentucky). Despite some controversy, the term PART has been widely adopted, with the consensus criteria cited over 1130 times as of April 2023 according to Google Scholar. At autopsy, the hallmark of PART is the presence of Alzheimer-type neurofibrillary tangles (NFTs) composed of abnormal tau protein in neurons in the medial temporal lobe, but no amyloid-beta (Aβ42) peptide accumulation in plaques. This ultimately leads to neuronal death and brain atrophy. 18% of Alzheimer neuropathological changes in cognitively normal and 5% of cognitively impaired elderly cases have been shown to display this pattern of degeneration. Patients with severe PART typically exhibit mild cognitive impairment or an amnestic dementia.

Diagnostics

Neuropathological features Patients with PART display neurofibrillary tangles that are essentially identical to those occurring in mild to moderate-stage Alzheimer's disease and other tauopathies. Amyloid pathology is sparse or absent in patients with PART. If few senile plaques are found, Thal phase grading can be implemented to differentiate the pathology as either PART or AD.

Clinical features Patients with PART can be cognitively normal, mildly cognitively impaired, or demented. Specifically, higher stages of tangle burden (i.e. Braak III or IV) in PART have been found to be associated with more rapid decline on tasks involving episodic and semantic memory along with tests of processing speed and attention. Braak state 0 is restricted to the cortex, state l-ll bound by transentorhinal region and it can progress into limbic region of the brain (stage lll-lV). PART can be further categorized as symptomatic (cognitive impairment and dementia) and asymptomatic (no signs of dementia). One current hypothesis suggests that PART related dementia could be infrequent in younger populations, but may show symptomatic onset within oldest old (people greater than 90 years old). Given that the elderly represent a fast growing segment of the population worldwide, further research is needed to understand how PART related pathological process can manifest in specific clinical symptoms. Furthermore, serological testing cannot be used to identify PART patients and MRI scans are the only current available diagnostic tools.

Relationship to Alzheimer's disease Given the similarities in the pattern of neurofibrillary tangles in PART, some scientists have argued that they represent the same phenomenon. However, others have argued that sufficient evidence exists to conclude that PART represents a pathological process. Further more, Aβ42 presence in AD contributes to tau hyper phosphorylation and consequently its development into NFTs. Aβ42 is absent in PART and due to several mechanisms underlying tau formation and maintenance, it would be necessary to separate PART from AD due to implications with respect to developing diagnostics and therapeutics.

Genetics PART has been associated with microtubule association tau protein (MAPT) H1 haplotype and no association has been seen with APOE ε4, a gene strongly linked to AD. Thus another piece of evidence supporting the hypothesis that PART represents a novel diagnostic category. Also transformation as a result of tau mutation into isoforms (3R and 4R) on chromosome 17 has been linked to Parkinson and frontotemporal dementia. Transformation in tau gene on chromosome 17 can be linked to PART due to the fact that the tau protein analyzed from PART NFTs consist of 3R and 4R isoforms. MAPT gene results in different tau protein isoforms due to splicing patterns of exon 10.

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Worked examples

Example 1 — a first encounter with Primary age-related tauopathy

Start with the simplest possible case. Write down what Primary age-related tauopathy 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 Primary age-related tauopathy 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 Primary age-related tauopathy 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 Primary age-related tauopathy

In research: Primary age-related tauopathy 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 Primary age-related tauopathy 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: Primary age-related tauopathy is common in secondary-school and first-year university syllabi. It links to neighbouring topics Dementia, so understanding it makes those chapters shorter.
In everyday life: Look for Primary age-related tauopathy 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 Primary age-related tauopathy in 20 minutes

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Close the page and write down what Primary age-related tauopathy means in your own words.
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Frequently asked questions

What is Primary age-related tauopathy in simple terms?

Why does Primary age-related tauopathy 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 Primary age-related tauopathy?

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 Primary age-related tauopathy.