UMD BSCI 437 - Classification and Taxonomy (25 pages)

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Classification and Taxonomy



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Classification and Taxonomy

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Lecture Notes


Pages:
25
School:
University of Maryland, College Park
Course:
Bsci 437 - General Virology

Unformatted text preview:

Classification and Taxonomy Reference site http www ncbi nlm nih gov ICTVdb index htm Naming viruses Animal viruses 1 Diseases that they cause small pox foot and mouth disease hepatitis 2 Places where virus was first identified Norwalk virus West Nile virus Hanta virus 3 Other Organ virus was isolated from adnoids Adenovirus Sin Nombre Plant viruses an many insect viruses two components 1 Host 2 Disease Tomato bushy stunt virus Classification and Taxonomy Classical morphology Physical and chemical composition Genetic relatedness Modern Phylogenetic based on nucleic acid sequence analysis 3 Classical criteria for classification of animal viruses Disease symptoms Useful in clinical situations Host organism implies a fixed link between virus and host Small pox HBV Physical structure of the virus particle Envelope vs no envelope Helical or isocahedral Alls these approaches fail to predict fundamental features of the viruses Modern Criteria for classification Based on genome composition and structure allows you to 1 deduce the basic steps that must take place to produce mRNA 2 simplifies comprehension of the life cycle of virus Baltimore classification Traditional classification generate thousands of distinct entities but based on genomes can be classified into 7 groups Classification and Nomenclature ICTV International Committee on Taxonomy of Viruses meets every 4 years Considerations Host range eukaryote or prokaryote animal plant etc Morphological features enveloped shape of capsid Nature of genome Taxonomy scheme Present totals Family 73 Subfamily 9 Genus 287 Species 1950 Family A group of genera with common characteristics Capitalized Italicized and end in viridae Examples Picornaviridae picornavirus family is also acceptable Herpesviridae herpesvirus family Flaviviridae flavivirus family Origins of family names 1 Symptoms or disease caused by viruses Herpes produce scaly snake skin lesions Pox infections produce pox lesions Papilloma infections result in papilla



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