FISH441: Oysters, acidification and methylation
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Transcript of FISH441: Oysters, acidification and methylation
DNA Methylation of Crassostrea gigas in Response to Ocean
AcidificationBy Andy Davison, Selina Cho, and
Ying-Ying Lin
Why do we care about Pacific oysters?
Why do we care about ocean acidification?
Why do we care about epigenetics?
ObjectivesQuantify the physiological
response of diploid and triploid oysters exposed to various acidified conditions
Implications of varying levels of DNA methylation
Methods
Restriction Enzyme Digestion
Methylated Cytosine Dot Blot
Gel Electrophoresis
Results
Triploid and diploid oyster mortality for control and high CO2
treatments
Restriction Enzyme Digestions PCR
amp- gigasin 2
All samples show elicit bands (~1140bp)
Row 2 sample 4- empty row
Row 2 sample 17- same band patterns
Hsp70
Smaller, fainter bands under only MspI samples
Bands appeared for both MspI and HpaII samples
Quantitative PCR control samples showed expression levels with a median of 1.3e-07hpaII digested samples- median of 2.5e-08
mspI digested samples- median 1.5e-08
Methylated Cytosine Dot Blot
Samples with 400ng of DNA showed methylation more frequently than 200ng samples
Methylation most common in both triploid and diploid oysters exposed to low pH conditions
14 of the 22 samples from the low pH treatment showed some level of methylation
Four of the 22 samples from the dry treatment showed signs of methylation
two of the 18 samples from the high pH, wet treatment demonstrated methylation
All samples of triploid, low pH (400ng) showed methylation
ConclusionsWhat went wrong?
◦Dot blot◦Restriction enzymes
Diploids and Triploids are the same
Phenotypic Plasticity-stress response
Thank you