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DNA Methylation in Plants

Submitted by alexispena on Fri, 11/03/2017 - 10:23
DNA Methylation is an epigenetic mechanism that controls gene expression by adding a methyl group to DNA. In plants, methylation can occur at base pair sites CG and non CG sites, where animals can only perform it at CG sites. If DNA methylation is compromised, the loss of function can lead to the release of silenced transposable elements or repetitive DNA sequences. There are two types of DNA methylation, de novo methylation and maintanence methylation. De novo methylation occurs during embryonic or differentiation processes. It is an RNA Directed DNA methylation (RdMD) that has two plant specific RNA polymerases Pol IV and Pol V. The RdMD pathway is triggered by siRNAs. Maintenance methylation is a process to maintain methylation patterns set up by de novo methylation. Mainenance methylation can occur at CG and non CG sites; the CG site is maintained by methyltransferase1 (MET1). The chromatin remodeling factor Decrease in DNA Methylation (DDM1) also plays a role in this process. Understanding DNA methylation in plants is imporant because prior studies have evidence that DNA methylation plays a role in Hybrid vigor, the phenomenon where hybrid offspring outperform their parents. Hybrid vigor is a concept used in agriculture to produce more main crops such as corn. 



This is a very well put together paragraph that uses commas very well. One thing I believe this paragraph is missing is a little background information so I understand more in depth what you are writing about. I also think your transition between sentences worked well.

Your paragraph was well outlined and the order of your sentences made sense. The content was very informative and I liked that you described the terms that you used.

This paragraph has a nice flow to it/has a good focus! But I do think some of the sentences are fragmented and could be transitioned better, and maybe just adding a bit of explanation background to a couple of the terms wouldn't hurt, but it's not totally neccessary!