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BIOL 2000 Lecture Notes - Antisense Rna, Rna Interference, Gene Silencing

Course Code
BIOL 2000
Joseph Rasmussen

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Chapter 8-4
Small RNAs were the breakthrough of the year
Non-coding RNAs
Small RNAS control gene expression at all levels
o Structure of chromatin
o Many different types of RNAs affected
Protein synthesis
o Translation
Different strands serve as templates for different gens but only one strand of
RNA is normally produced
o No anti-sense RNA strand produced
o Double stranded RNA only produced by artificially
Trigger production of gene regulation
Introduce additional genes into a cell or
o Want to enhance phenotype by
allowing more selection
Unusual insertion sites for introduced
genes may generate double-stranded RNA
(an “artificial situation”)
o Not much control of where it
o Transgene works from left to right
o Normal gene works from right to left
Should stop at end of gene- does not- keeps going through
Creates complementary strand of RNA
Creates a double stranded RNA
Trans-genetics in petunias
Intention of enhancing purple pigment
Shutting of purple pigment phenotypes in certain areas
o Suppression
Similar suppression of phenotypes can be induced by injecting cells with
double stranded RNA molecules
RNA interference (RNAi)
Gene silencing mediated through
small RNA molecules
Double stranded RNA acts as the
trigger mechanism
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