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TSE agent strains and PrP: reconciling structure and function.

Robert A Somerville¹

¹Neuropathogenesis Unit, Institute for Animal Health, West Mains Road, Edinburgh, Scotland, UK, EH9 3JF. robert.somerville@bbsrc.ac.uk

Trends in Biochemical Sciences

|December 7, 2002

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The infectious agents causing transmissible spongiform encephalopathy (TSE) diseases remain uncharacterized. This study discusses evidence for and against the prion hypothesis, proposing a nucleic acid molecule may transmit TSE genetic information.

Area of Science:

Neuroscience
Molecular Biology
Infectious Diseases

Background:

Transmissible spongiform encephalopathy (TSE) diseases are fatal neurodegenerative disorders.
The causative agents' molecular structures are unknown.
The prion hypothesis is widely accepted but lacks definitive proof.

Purpose of the Study:

To review data supporting and challenging the prion hypothesis for TSE agents.
To propose requirements for a molecule capable of transmitting TSE-specific genetic information.
To suggest the nature of the molecule responsible for TSE pathogenesis diversity.

Main Methods:

Literature review of biochemical and biological properties of TSE agents.
Analysis of evidence for and against the prion hypothesis.

Related Experiment Videos

Theoretical proposal for a genetic information-carrying molecule.

Main Results:

Existing data present both support for and challenges to the prion hypothesis.
A need for independent transmission of TSE agent-specific genetic information is identified.
A small nucleic acid molecule is proposed as the likely carrier of genetic information.

Conclusions:

The prion hypothesis alone may not fully explain TSE agent properties.
A nucleic acid component is likely essential for TSE agent infectivity and pathogenesis.
Further research should focus on identifying this proposed nucleic acid molecule.