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BACTERIAL GENETICS AND GENE TRANSFER
Done By: Hani Shihadeh & Lubna Alnatour
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This chapter covers the mechanisms
of bacterial exchange of genetic
information
BACTERIAL GENETICS AND GENE TRANSFER
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➢ Because there is only one
copy of this molecule per
cell, bacteria exist in a
haploid state
➢ Bacteria do not have
nuclear membranes
surrounding their DNA
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Because they are not
essential for the
survival of the bacteria
not all bacteria
contains these
extrachromosomal
species
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Autonomous replication :
They can replicate
independently
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Bacteriocins:
toxins produced
by bacteria to inhibit the
growth of similar or
closely related bacterial
strain, considered safe
for mammalian since
they can be easily
degraded by proteolytic
enzymes
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Conjugative: meaning that they can transfer
from one bacterial cell to another during
conjugation process between two bacteria
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Genotype / Wild Type : Represents all potentialgenes of bacteria cell.. Its genome.. All Inheritedessential biological features & growth patterns.
Phenotype: The expressed genes. The observedcharacteristics of the individual bacteriaspecies/strain. Expressed by physical & biochemicalproperties. Growth patterns, Fermentation products,Antibiotic resistance, Toxins production. .etc.
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Horizontal gene transformation
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Jumping genes/copy and paste (Class1) or cut and paste (2)
Between plasmids or between chromosomes and plasmids
•medical importance since many antibiotic resistance genes
are encoded by transposons in antibiotic resistance plasmids
Extra info: it’s also called replicative transposition
Extra info: it’s also called Non-
replicative transposition
Recommended Video About
transposons
https://youtu.be/CroyUMRpbxg
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Results in the termination of
polypeptide synthesis where
the wild-type DNA suffers a
change in one base pair that
results in the appearance of
stop codon
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MISSENSE MUTATION: RESULT IN DIFFERENT AMINOACIDS BEING INSERTED IN PROTEIN
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Nonsense mutation: change a codon encoding an amino acid
into stop codon that result in failure of protein synthesis
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• Frame shift mutation: One or more base are added or deleted, Shift in the
reading frame
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Silent mutation: the change in the nucleotide sequence doesn't result in
a change in protein sequence
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THERE ARE THREE TYPES OF HORIZONTAL GENE TRANSFER
Conjugation,
Transduction and
Transformation:
https://youtu.be/MR7yvRDL5iQ
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Doner cell
Recipient cell
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• Hfr bacteria are still able to initiate conjugation with F- cells, but the
outcome is completely different from conjugation involving F+
bacteria. IT IS called an F’ instead ( F prime )
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With genetic
material inside
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Specialized transduction:
**In specialized transduction, bacteriophage transfer only a few restricted gene
(DNA fragments) from donor bacteria to recipient bacteria. Specialized
transduction is carried only by temperate bacteriophage .
bacteriophage (phage) are viruses of bacteria - can beor temperate (Lysogenic)
either lytic
**
lytic - always lyse (kill) host bacterial celltemperate - can stably infect and coexist within bacterial cell(lysogeny) until a lytic phase is induced
* the phage genome during lysogeny is called the prophage, andthe bacterial cell is called a lysogen
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For Revision:
Generalized transduction:https://youtu.be/C44ymgwgA-o
Specified transduction https://youtu.be/ZxbPYekSTLg
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pages for this lecture from MRS textbook
Chapter 3
Only 5 pages you can reed it to revise and
understand more
https://drive.google.com/file/d/1G_OIs2_F9E2JDMpTP8Kf9a3A
TD2QhUPh/view?usp=sharing
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Q1
Answer: B
Which of the following best describes vertical gene transfer?
a) Copying and passing of the entire genome from a mother cell to a daughter cell.
b) Copying and passing of DNA plasmids from a mother cell to a daughter cell.
c) Copying and passing of the entire genome between bacterial cells via a pilus.
d) Copying and passing of DNA plasmids between a mother and a daughter cell via a pilus.
e) Copying and passing parts of the genome between bacterial cells via a bacteriophage.
Answer: A
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Q2
Answer: A
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Conjugation is best described as:
a) A) Plasmid movement by cell-cell contact
b) B)Uptake of naked DNA
c) C)Using bacteriophages as vectors
d) D)Jumping genes
Q3
Answer: A
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Which of the following is false regarding specialized transduction?
a) It is carried out by temperate bacteriophages
b) It always leads to direct lysis of host bacterial cell
c) ‘Lysogeny’ and co-existing can be observed
d) None of the above is false
Answer: B
Q4
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What type of bacterial gene transfer is this?
a) recombination, IS (elements)
b) conjugative, nonconjugative
c) conjugation
d) transformation
Answer: C
Q5
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A transposable element that is excised from one position in the genome and inserted into
another position through the action of transposase. Occurs in both eukaryotes and prokaryotes
a) Transcription of bacterial genome b) autonomously, circularc) competence, recombinationd) cut-and-paste (transposon)
Answer: D
Q6
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The name of cell “C” is
a) F-
b) F+
c) Hfr
d) None of the above
Answer: C
Q7
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Insertion or deletion of a single/multiple base pairs in the DNA which results in a complete
different translation from the original, this definition best describes which type of mutations?
a) Frame shift mutations
b) Missense mutations
c) Nonsense mutations
d) Silent mutations
Q8
Answer: A
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The type of gene transfer in this figure is:
a) Conjugation
b) Transduction
c) Transformation
d) Fission
Answer: B
Q9
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ability of a bacteria to bind and translocate to DNA, typically not naturally, certain bacteria
take up DNA to chromosome
a) Transduction
b) Recombination
c) Transformation
d) Conjugation Answer: C
Q10
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إن لم تركض في ساحات العشرين الفسيحة ، ففي"
أزقة أي أربعين ستفعل؟
"عش شغفك فأيامك تمضي