Viroids

Card Set Information

Author:
wsucoug12
ID:
311341
Filename:
Viroids
Updated:
2015-11-11 20:26:06
Tags:
Viroids
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Description:
Viroids
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  1. List characteristics of viroids
    • 1. Low molecular weight
    • 2. Nonencapsidated
    • 3. Replicate autonomously
    • 4. Obligate parasite
    • 5. Infectious
    • They are unique to plants
    • 1967 Dr. Ted Diener discovered
    • viroids
    • genome is 300 bp
    • ssRNA only
    • monopartite genome
    • no proteins
  2. Describe viroids strandedness
    • Characteristics of both ss & ds RNA
    • due to internal base-pairing
    • twisted "hairpin" structure
    • structure similar to tRNA
  3. Describe viroid replication
    • not well-understood
    • during transcription of host DNA
    • occurs in the nucleus
  4. Describe viroids pathogenesis
    • interference with gene regulation
    • “escaped” regulatory RNAs
  5. How are viroids transmitted
    • vegetative propagation
    • mechanical
    • vectors mostly unimportant
    • limited seed and pollen
  6. How do viroids survive?
    in association with living host
  7. How did viroids thought to have originated?
    • Primitive viruses
    • “escaped” regulatory molecules

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