The aim of this experiment is to identify the gene or genes responsible for the morphological and functional integrity of plant organelles. This is accomplished by first adding Ethel methane sulfonate as a chemical agent to mutagen atopy seeds carrying the organelle fluorescent marker. The second step is to collect seeds from individual plants of the first mutagen generation to grow lines of the subsequent mutant generation M two.
Next, the mutagen a Eliana seeds are observed using a confocal or fluorescent microscope to identify the aberrant organal phenotype. The final step is to generate the third mutagen generation and confirm the presence of the mutant phenotype. Ultimately, the recessive mutation can be mapped using next generation sequencing tools.
Once the location of the mutant gene is identified, transformation with the wild type gene should restore the aberrant organal phenotype. This method can help answer key questions in the maintenance of morphological and functional integrity of plant organelles. Atil methanes, sulfonate treatment of atop sta seeds induce cytosine timing changes in the genome resulting in cytosine gwan to timing.
Adding mutations. EMS treatment is a key step in this protocol to ensure a perfect ratio mutation inside M two individuals. To begin obtain Arabidopsis seeds of the wild type Columbia Ecotype that have been previously engineered to carry a relevant organelle fluorescent marker.
Transfer 0.8 grams or about 40, 000 seeds to a 50 milliliter falcon tube. Then add 25 milliliters of distilled water and 0.2%Ethel methane sulfonate. Incubate the mixture for 16 hours on a mutating mixer at low speed following incubation, aspirate the liquid and discard it into a flass containing one molar sodium hydroxide.
To inactivate the EMS, add 25 milliliters of water to the Falcon tube containing the seeds. Close the tube and invert five times to wash the seeds. After all the seeds have settled, aspirate the water and discard into the one molar sodium hydroxide flask.
Repeat this washing step up to 10 times after the final wash, Reese spend the seeds in a minimal amount of water. Proceed to seed sterilization by adding 25 milliliters of 10%bleach and shaking vigorously for 30 seconds. Once the seeds settle to the bottom, pour off the bleach and rinse with 25 milliliters of sterile water.
Following removal of the sterile water, add 25 milliliters of 70%ethanol. Shake the tubes for 30 seconds and allow the seeds to settle to the bottom. Pour off the ethanol and rinse with 25 milliliters of sterile water.
Repeat the sterile water wash twice. Then pour the seeds onto a plastic Petri dish containing three mm filter paper. Allow the seeds to dry under the hood after incubating the seeds for two days at four degrees Celsius.
Place the seeds in a 150 millimeter Petri dish at approximately 250 to 300 seeds per plate in half Magi and scoog medium containing fighter gel. As a jelling agent, grow the seeds from the M1 generation on plates for two weeks. Transplant the seedlings to soil and allow the plants to continue to grow.
After 30 to 45 days, the plants will reach the mature stage where mature, so leaks can be seen clearly. At this point, collect M two seeds from individual M1 plants to generate 1000 independent M two lines. In order to observe the seedlings with a confocal or fluorescence microscope, grow 60 seeds from each M two line for seven to 10 days on plastic Petri dishes in half.
Moreish and scoog medium containing fighter gel also grow five seedlings of the EMS untreated control on the same plate. Once the seedlings are grown, mount five to 10 cos lead-ins with the ABAC seal side towards the 40 times lens on a microscope slide and enclosed with a cover slip under fluorescence, observe each olein from the cortical to medial region for altered subcellular distribution of the organelle marker. Following transplant of positive plants into soil and grow that the seedlings as just described, confirm that the mutant phenotype is in the M three generation.
Remove the contaminating background mutations through back crossing at least three times to a wild type genome containing the desired organal fluorescent marker as described in the written protocol. To begin mapping, use cogen DN Easy Z plant mini kit to extract approximately three micrograms of genomic DNA from M three, which represents the homozygous mutant Columbia DNA. Submit this DNA for Illumina genome analyzer two 14 sequencing.
The next step is to cross the zago mutant Colombia will Las Berger to generate the one progeny following self pollination in which the combination can occur. The deaf tooth generation will result and ultimately serve as a mapping population containing the gene of interest, which is causing the mutation. By comparing the genomic DNA of this population with the genomic DNA of well type plants, the location of the mutation can be identified in the genome.
After growth of the F two plants, gather between 70 and 100 F two individuals showing the aberrant phenotype and the same number of F two plants with a wild type phenotype, collect a leaf disc from each plant using a whole punch. The leaf disc should be collected from leaves of the same age. To ensure similar amounts of DNA, the samples can be processed for genomic extraction separately or in groups.
In this case, it is possible to collect five to 10 samples for each eend orph tube so that there are fewer tubes from which genomic DNA has to be extracted. Use the master pure plant leaf DNA purification kit to extract the genomic DNA. The genomic DNA obtained from each sample can then be quantified with a NanoDrop.
Then combining equal amount of DNA from each sample up to a total of 300 nanograms keeping mutant and wild type samples separate to make the labeling reaction first, add 60 microliters of 2.5 x random primer solution and 42 microliters of water. After denaturing the DNAA greater than 95 degrees Celsius for five to 10 minutes, call the samples on ice to denature DNA. Add 15 microliters of 10 X DN tps.
Mix with biotin DCTP and complete with three microliters. Glen polymerase. Incubate the samples overnight at 25 degrees Celsius.
On the following day, add 15 microliters of three molar sodium acetate and 400 microliters of cold 100%Ethanol. Incubate the mixed samples at minus 80 degrees Celsius for one hour following centrifugation at 20, 500 times G for 15 minutes. Wash the pellet with 500 microliters of cold, 75%ethanol subsequent to a second spin.
Dry the DNA pellets at 37 degrees Celsius for 10 minutes. Re suspend the pellets in 100 microliters of water and use five microliters to check yield and quality on a gel bio. Prime random labeling reactions were loaded on a 1%aros gel from a pool of wild type F two plants and from a pool of mutant F two plants.
As a final step, send 95 microliters of the wild type and mutant labeling reaction for gene chip arabidopsis ath one genome array hybridization. After the eraser scanned, the resulting dot CL files obtained are analyzed using our software. After installing our software, open the program and paste the bioconductor string found in the written procedure.
Then press the return key, which will install the standard BIOCONDUCTOR packages from the array, genotyping and mapping website. Download and unzip the files listed in the text into a new folder on the desktop. Remain the data obtained from the gene chip experiment into wild type C, L, and mutant C.Now copy the gene chip data for wild type C and mutant C into the folder.
Next, open R for a pc. Click file and then click change directory. Select the folder containing the files, click file load workspace, and then select A one V five R data open read C do R using notepad and copy the whole text to R for a mac, click mis and then click change working directory.
Select the folder containing the files. Click workspace load workspace file and select ATH one V five R data. Similarly open both SFP R and MAP R using text, edit and copy the text to R in the console window.
A message will appear to search genes at the Arabidopsis information resource or TAIR. Copy and paste the link found in the text into the internet browser. A window will appear and ask to open or save the file.
Select save. Choose a file name and attach the extension. Do x ls.
Then click save. Shown here is a typical result expected. After analyzing the data obtained from the gene chip Arabidopsis H one genome array, this figure represents an example of mapping of Columbia zero mutation using gene chip Arabidopsis, a H one genome hybridization, where the horizontal bars represent the thresholds for detection.
The mutation in this example is located on chromosome one, delimited by vertical bars. Open the file dot XLS to find the coordinate for the mutant within the mapped area. In the assembled Illumina reads of the mutant genome, identify specific EMS transitions amongst the single nucleotide polymorphisms.
Once mastered the approach describing this protocol can be used to map gene a three short timeframe as compared to the classical mapping method.
