LECTURE 20 MUTATION, REPAIR & RECOMBINATION II Hchapter 14 Hpoint mutations Hspontaneous mutations...
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Transcript of LECTURE 20 MUTATION, REPAIR & RECOMBINATION II Hchapter 14 Hpoint mutations Hspontaneous mutations...
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LECTURE 20 MUTATION, REPAIR & RECOMBINATION II
chapter 14 point mutations spontaneous mutations biological repair meiotic crossing-over
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you need a piece of paper and a pen or pencil... write your name and student number at the top... give brief answers for the question(s) below...
Meiotic crossing-over is associated
with what process?
LECTURE 20 MUTATION, REPAIR & RECOMBINATION II
DNA repair (1)
double stranded DNA breakage/damage (1)
heteroduplex DNA (½)
recombination (½)
gene conversion (½)
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go to schools in person
ask to speak with the guidance councellor
TUTORING CLARK COUNTY HIGH SCHOOL STUDENTS
Las Vegas High School
6500 E. Sahara
Dr. Patrice Johnson, Principal @ 799.0180
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SPONTANEOUS MUTATIONS mutation frequency = mutants / population (0 1)
generally rare variable ~ gene
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SPONTANEOUS MUTATIONS mutation frequency = mutants / population (0 1)
= 2/8 = 0.25
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SPONTANEOUS MUTATIONS
mutation rate = mutation events / gene / time... 1 mutation event (M) 7 cell divisions 1/7 = 0.143
mutation frequency = mutants / population (0 1) = 2/8 = 0.25
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SPONTANEOUS MUTATIONS mutation rate = mutation events / gene / time...
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SPONTANEOUS MUTATIONS mutation rate = mutation events / gene / time...
1 mutation event (M) 7 cell divisions 1/7 = 0.143
measurement... need # cell divisions
= n – initial cell # = 8 – 1 = 7 n in cultures
“0 class” frequency
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SPONTANEOUS MUTATIONS
measurement... mutation rate () Poisson distribution mutational events / cell division = mutational events / culture = n frequency of cultures with 0
mutants = e–n
e.g. if n = 0.2 108 cells 0 class = e–n = 11/20 = 0.55 0.55 = e–(0.2 108)
3 10–8 events / cell division
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SPONTANEOUS MUTATIONS
Calculate the mutation rate / cell division / resistance gene in 108 Tons E. coli spread on 100 minimal media plates with T1 phage where 31 of these plates had no growth.
n = 108 cells (–1 = # cell divisions) 0 class = e–n = 31/100 = 0.31
0.31 = e–(108)
= 1.17 10–8 events / cell division / gene
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SPONTANEOUS MUTATIONS
spontaneous lesions depurination = loss of A or G deamination of C U or 5-methyl-C T
depurination > deamination oxidative damage
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SPONTANEOUS MUTATIONS
spontaneous lesions depurination = loss of A or G
break sugar • base glycosidic bond mammalian cells loose ~ 104 purines / cell / gen. error-prone SOS repair
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SPONTANEOUS MUTATIONS
spontaneous lesions deamination of C U or 5-methyl-C T
GC AT transitions U repairable T not... hot spots
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SPONTANEOUS MUTATIONS
spontaneous lesions oxidative damage of G 8-oxodG (GO)
active O species (O2–, H2O2, OH–)
GC TA transversions
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replication errors framshift mutations repeat DNA sequences slipped mispairing
SPONTANEOUS MUTATIONS
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INDUCED MUTATIONS
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reversion tests tell us about the nature of the forward mutation ... and action of the mutagens used e.g. mutagen specificity implied if it does not revert
its own forward reaction
INDUCED MUTATIONS
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reversion tests... example question, p. 479, # 27
INDUCED MUTATIONS
MUTANT 5-BU (transitions)
HA (GC>AT transitions only)
PROFLAVIN (frameshifts)
SPONTANEOUS REVERSION
1 – – – –2 – – + +3 + – – +4 – – – +5 + + – +
1. likely a deletion, perhaps caused by radiation as nothing will revert it2. frameshift, reverted by proflavin and spontaneously3. GC > AT transition, not reverted by 1-way mutagen4. transversion, none of the chemical mutagens will revert it 5. AT > GC transition, reverted by GC > AT transitions only
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error-free repair
(a) chemical repair of DNA base damage
BIOLOGICAL REPAIR
(b & c) 2 step process:
1. damaged DNA
deleted,
2. complementary
template strand used
to restore sequence
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chemical repair of DNA base damage (a) photorepair with photolyase + visible light
BIOLOGICAL REPAIR
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chemical repair of DNA base damage (a) alkyltransferase (e.g. methyltransferase) removes methyl groups, e.g. added by EMS
BIOLOGICAL REPAIR
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homology-dependent repair, 2 general types excision repair (b)
base excision repair nucleotide excision repair in prokaryotes transcription-coupled repair in eukaryotes
postreplication repair (c) in prokaryotes in eukaryotes
BIOLOGICAL REPAIR
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excision repair base excision repair
DNA glycosylases cleave base-sugar bonds (different types)
apurinic or apyrimidinic sites
enzymes: 1. AP endonuclease 2. excision exonuclease 3. DNA polymerase, 4. ligase
more ways to damage bases than # of DNA glycosylases...
BIOLOGICAL REPAIR
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excision repair nucleotide excision repair (prokaryotes)
detects distortions in DNA enzymes: 1. uvrABC exinucleases
removes 8+4 nucleotides 2. DNA pol I 3. ligase
BIOLOGICAL REPAIR
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excision repair transcription-coupled repair (eukaryotes)
important, many cells terminally differentiated & no longer dividing
no replication-repair damage blocks
transcription detects distortions in DNA
BIOLOGICAL REPAIR
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excision repair transcription-coupled repair (eukaryotes)
repairisome (>20 subunits) 7 of these part of
transcription machinery removes ~ 30 nucleotides preferentially repairs
template strand bubble forms, excision,
DNA synthesis & ligation
BIOLOGICAL REPAIR
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excision repair postreplication-repair (prokaryotes)
replication errors missed by proof-reading function of DNA pol mismatch-repair system
1. recognizes mismatch2. distinguishes incorrect
base from correct errors always on new
unmethylated strand3. excise incorrect base repair synthesis
BIOLOGICAL REPAIR
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excision repair postreplication-repair
(eukaryotes) microsatelites, some in
critical coding regions slipped-mispairing
replication errors missed by proof-reading
function of DNA pol mismatch-repair system
BIOLOGICAL REPAIR
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error-prone repair double stranded breaks from
reactive oxygen species ionizing radiation (X-rays, -rays)
unlike single stranded damage no exact template, no error-free repair...
BIOLOGICAL REPAIR
error-prone repair less harmful than no repair at all SOS (already discussed) non-homologous end joining homologous recombination
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SOS repair error-prone DNA
polymerases translesion DNA
synthesis mutagenic
BIOLOGICAL REPAIR
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non-homologous end joining bind broken ends trimming joining
involved in generating rearrangements of antibody genes in mammalian immune systems
BIOLOGICAL REPAIR
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homologous recombination homologous sister
chromatids trim ends DNA-protein filament homology search &
strand invasion DNA synthesis ligation ~ crossing-over
BIOLOGICAL REPAIR
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initiated by double-stranded chromosome breakage
between 2 homologous non-sister chromatids
no gain or loss of genetic material
2 steps
double stranded breakage
heteroduplex DNA formed, derived from non-sister chromatids on homologous chromosomes
MEIOTIC CROSSING-OVER
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evidence first from aberrant ratios observed in fungi aberrant asci have > 4 copies of on genotype extra copies changed through gene conversion 5:3 ratio from non-identical sister spores in meiosis with heteroduplex...
MEIOTIC CROSSING-OVER
AAAAaaaa
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evidence first from aberrant ratios observed in fungi aberrant asci have > 4 copies of on genotype extra copies changed through gene conversion 5:3 ratio from non-identical sister spores in meiosis with heteroduplex not repaired
MEIOTIC CROSSING-OVER
AAAaaaaa
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evidence first from aberrant ratios observed in fungi aberrant asci have > 4 copies of on genotype extra copies changed through gene conversion 6:2 ratio from non-identical sister spores in meiosis with heteroduplex repaired
MEIOTIC CROSSING-OVER
AAaaaaaa
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double-stranded break model of crossing-over
MEIOTIC CROSSING-OVER
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double-stranded break model of crossing-over
MEIOTIC CROSSING-OVER
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double-stranded break model of crossing-over
MEIOTIC CROSSING-OVER
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how to think about this problem...
MEIOTIC CROSSING-OVER
BRANCH MIGRATION ROTATE PERSPECTIVE
BREAKS conversion
“horizontal breakage”
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MEIOTIC CROSSING-OVER
BRANCH MIGRATION ROTATE PERSPECTIVE
BREAKS
how to think about this problem...
recombination
“vertical breakage”
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MEIOTIC CROSSING-OVER
BRANCH MIGRATIONthanks to Bill Engels, Univ. Wisconsin
how to think about this problem...
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MEIOTIC CROSSING-OVER
ROTATE PERSECTIVEthanks to Bill Engels, Univ. Wisconsin
how to think about this problem...
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MEIOTIC CROSSING-OVER
recombination between alleles of a gene intragenic recombination obviously, shorter distances, lower recovery rates
a1 A2+
A1+ a2
GENE A
a1 A2+
a1 a2
A1+ A2+
A1+ a2
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unsolved problems (p.478-80) 1- 36
try all of them on your own first then see me / TAs if you have difficulties
SPEND SOME TIME ON...
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NEUROBIOLOGY – BIOL 475 / 604
TR 4:00 – 5:15
CBC A108
Behavioral Neurobiology: The Cellular Organization of Natural Behavior by Thomas J. Carew