Besides RNA molecules, a plethora of proteins are involved in the establishment of RdDM, like Argonautes, DNA methyltransferases, chromatin remodelling complexes and the plant-specific Polymerase IV and Polymerase V. All these act in concert to add a methyl-group at the 5′ position of cytosines. In contrast to animals, cytosines at all sequence context (CG, CHG, CHH) may get de novo methylated in plants.
There is no such thing as de novo methylation. Methylation is energy-dependent. Virus-driven energy theft prevents methylation and links mutations to all pathology via everything known to young earth creationists, which some of them have been reporting since the late 1990’s. That fact explains why theorists were forced to change RNA-Directed DNA Methylation to RNA interference in a face-saving attempt. Many pseudoscientists have claimed the creationists cannot be scientists and their attacks on young earth creationists have been among the most vicious of all attacks. But now, the young earth creationists have this:
RNA interference (RNAi) RNA interference (RNAi) is a biological process in which RNA molecules inhibit gene expression or translation, by neutralizing targeted mRNA molecules. Historically, it was known by other names, including co-suppression, post-transcriptional gene silencing (PTGS), and quelling. Only after these apparently unrelated processes were fully understood did it become clear that they all described the RNAi phenomenon.
The so-called unrelated processes linked to RNAi phenomenon were place into the context of what was known about molecular epigenetics in our section on molecular epigenetics from this 1996 Hormones and Behavior review.
Yet another kind of epigenetic imprinting occurs in species as diverse as yeast, Drosophila, mice, and humans and is based upon small DNA-binding proteins called “chromo domain” proteins, e.g., polycomb. These proteins affect chromatin structure, often in telomeric regions, and thereby affect transcription and silencing of various genes (Saunders, Chue, Goebl, Craig, Clark, Powers, Eissenberg, Elgin, Rothfield, and Earnshaw, 1993; Singh, Miller, Pearce, Kothary, Burton, Paro, James, and Gaunt, 1991; Trofatter, Long, Murrell, Stotler, Gusella, and Buckler, 1995). Small intranuclear proteins also participate in generating alternative splicing techniques of pre-mRNA and, by this mechanism, contribute to sexual differentiation in at least two species, Drosophila melanogaster and Caenorhabditis elegans (Adler and Hajduk, 1994; de Bono, Zarkower, and Hodgkin, 1995; Ge, Zuo, and Manley, 1991; Green, 1991; Parkhurst and Meneely, 1994; Wilkins, 1995; Wolfner, 1988). That similar proteins perform functions in humans suggests the possibility that some human sex differences may arise from alternative splicings of otherwise identical genes.
The alternative splicings are energy-dependent.
Because de novo modification appears to take place almost exclusively on CpG islands that are already silenced by polycomb in the normal tissue (8), we suggest that this modification works by preventing these genes from becoming activated, thereby inhibiting normal tissue differentiation, causing clonal selection for cells that may predispose to cancer (31). Indeed, many of these methylation targets have been shown to be “driver” genes in a number of different cell types (Fig. S6).
Virus-driven energy theft prevents what they claim are the de novo modifications and the energy theft links contraint-breaking mutations from viral latency to all pathology. Only biologically uninformed pseudoscientists have continued to portray energy-dependent changes in methylation as if the changes occurred in the context of de novo modification.
See for comparison. These creationists start with energy and link it to experience-dependent cell type differentiation via what is known about sensing and signalling in all living genera.
Evolutionary scientists did not predict such elaborate sensory integration in a single protein system.
Sensing and signalling in all living genera is links the physiology of reproduction in soil bacteria to the phyisology of pheromone-controlled reproduction in all livng genera. See for example:
The TSARL1 transcript was alternatively spliced in the sweet progeny of Kurmi and 0654. A SNP in the last position of exon 3 (G2078C) co-segregates with the presence of saponins in the Kurmi × 0654 progeny. The G2078C SNP alters the canonical intron/exon splice boundary (Fig. 4e), probably leading to the alternative splicing at an upstream cryptic splice site in the sweet lines (Fig. 4e). This alternative splicing of TSARL1 results in a premature stop codon…
Start codons are important to understand because they mark the beginning of a recipe for translating RNA into specific strings of amino acids (i.e., proteins).
They help to make the fact clear that all organisms must eat.
They make it clear that the bias between codons or amino acids, and mRNA expression is the link from natural selection for energy as information that links the selection of food to efficient, accurate translation, and folding of expressed genes. Simply put, the energy-dependent amino acid optimality code differentiates between theories of evolution and facts about how ecological variation must be linked to ecological adaptation via the physiology of pheromone-controlled energy-dependent reproduction and supercoiled DNA in all living genera.
Obviously, pseudoscientists who cannot link energy-dependent changes in codon optimality have indirectly been responsible for all virus-driven pathology because they failed to link the viral hecatomb from archaea to the transgenerational epigenetic inheritance of Zika virus-damaged DNA or to all other pathology, including cancer and degenerative diseases.
Thank God, Bill Gates and President Trump are among the billionaires who have decided to help others who have been combating evolutionary theorists to fight disease for several decades.
See also: Combating Evolution to Fight Disease