Editing 2298: Coronavirus Genome

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| number    = 2298
 
| date      = April 24, 2020
 
| title    = Coronavirus Genome
 
| image    = coronavirus_genome.png
 
| titletext = Spellcheck has been great, but whoever figures out how to get grammar check to work is guaranteed a Nobel.
 
}}
 
 
 
==Explanation==
 
This comic is another comic in a [[:Category:COVID-19|series of comics]] related to the {{w|COVID-19 pandemic}}.
 
 
 
It was also the first in a [[:Category:Coronavirus Genome|new series]], followed in the next comic by [[2299: Coronavirus Genome 2]].
 
 
 
[[Megan]] is a {{w|Genetics|geneticist}} doing research on the SARS-CoV-2 virus. She is analyzing the virus's {{w|genome}}, its genetic material composed of {{w|RNA}}. The genomic sequence can be represented as a list of {{w|nucleotide}} bases ({{w|guanine}}, {{w|adenine}}, {{w|cytosine}}, {{w|thymine}} and {{w|uracil}} - often abbreviated as G, A, C, T, and U).
 
 
 
The nucleotide sequence displayed is a 100% match to six SARS-CoV-2 sequences in public databases, all of them originating from the East Coast of the United States. The sequence is from nucleotides 26202-26280 of the virus genome and overlaps an unknown open reading frame/gene named ORF3a. One of the matching sequences is [https://www.ebi.ac.uk/ena/data/view/MT344963]. However, SARS-CoV-2 is an RNA virus, and so its genetic material (not containing any DNA) would not include thymine (T) but would use uracil (U) instead. The sequence uses the codes of DNA as {{w|RNA sequencing}} involves copying the genome into a DNA, and the DNA code is more familiar anyways.
 
 
 
[[Cueball]] is surprised that Megan and her colleagues actually use {{w|Microsoft Notepad}}, a simple {{w|text editor}}, to look at the genome, instead of more modern technology. She explains that better research institutions use {{w|Microsoft Word}}, a more advanced editor, to allow additional formatting (such as '''bolding''' and ''italics''), and humorously calls this "{{w|epigenetics}}". In the real world, epigenetics is the study of changes that are not caused by changes in nucleotides, but by chemical modifications of DNA or chromosomes that cause changes in patterns of gene expression and activation, sometimes several generations down.  This might be considered analogous to altering the meaning of a text by changing its formatting rather than the content; for example, content can be moved into parentheses or footnotes to be de-emphasized, or rendered in boldface or enlarged to attract attention and emphasize key points. Much as text can be wrapped in HTML tags or similar markup to change its formatting, nucleotides can be {{w|DNA methylation|methylated}} to prevent transcription, and the {{w|histone}}s around which DNA is wound can also be modified to promote or repress gene expression. During DNA replication, these modifications are often also reproduced.
 
 
 
The real punchline comes when Megan uses {{w|Spell checker|spellcheck}} to detect mutations in the genome by adding the previous genome to spellcheck and comparing them. Overall, Megan uses ridiculously and humorously crude methods to analyze a major genetic item. The genome of SARS-CoV-2 is almost 30,000 base-pairs long, which exceeds the {{w|longest words}} of any natural language by two orders of magnitude (the longest words ever used in literature -- i.e. not constructed in isolation simply for the purpose of being a long word, or chemical formulas -- approach 200 letters), and may exceed the capabilities of any available spell-checking program. Furthermore, a spellcheck program underlines the whole word if a single letter is wrong and not just the letter itself. Thus, it would not be able to highlight individual mutated base pairs.  Megan might be better served by using a {{w|diff}} tool, but most scientists generally use commercial software that is designed to view, annotate, and edit DNA sequences (eg: Snapgene, Geneious, DNAstrider, ApE).
 
 
 
The title text mentions {{w|Grammar checker|grammar checking}} and claims that whoever discovers how to use that to compare genomic material should be awarded a {{w|Nobel Prize}}. Spell-checking is analogous to comparing sequences against ones previously known, an activity that is the bread and butter of bioinformatics nowadays. Grammar checking would be analogous to having some sort of sense as to how well all the sequences generally cooperate and interact to create possibly viable functionality in an organism, something we are unable to do at the moment except in very limited ways and only in a few simple cases. It may also be a snarky commentary on the untrustworthy nature of grammar-check programs in general, which often follow grammatical rules far more strictly than is practical; it's not uncommon for an author to follow a grammar-check recommended correction only to find the corrected portion is now part of a longer portion that the checker deems "incorrect".
 
 
 
Amusingly, this and the title text foreshadowed the usage of an MIT language learning algorithm to predict mutations in SARS-CoV-2.
 
 
 
==Transcript==
 
 
 
:[Megan sits at a desk, working on a laptop. A genome sequence is displayed on her laptop screen, shown with a jagged line in a text bubble.]
 
:Cueball (off-screen): So that's the coronavirus genome, huh?
 
:Megan: It is!
 
:Laptop: ''<A long string of unintelligible letters, presumably the genome>''
 
 
 
:[Cueball walks up and stands behind Megan, still working on the laptop.]
 
:Cueball: It's weird that you can just look at it in a text editor.
 
:Megan: It's essential!
 
:Megan: We geneticists do most of our work in Notepad.
 
 
 
:[A frameless panel, Cueball still standing behind Megan. Megan rests her arm on the chair. ]
 
:Cueball: Notepad?
 
:Megan: Yup! Nicer labs use Word, which lets you change the genome font size and make nucleotides bold or italic.
 
:Cueball: Ah, okay.
 
:Megan: That extra formatting is called "epigenetics".
 
 
 
:[A regular panel. Cueball still stands behind Megan, this time with his hand on his chin.]
 
:Cueball: Hey, why does that one have a red underline?
 
:Megan: When we identify a virus, we add its genome to spellcheck. That's how we spot mutations.
 
:Cueball: ''Clever!''
 
 
 
{{comic discussion}}
 
 
 
[[Category:Coronavirus Genome]]
 
[[Category:Comics sharing name|Coronavirus Genome]]
 
[[Category:COVID-19]]
 
[[Category:Comics featuring Cueball]]
 
[[Category:Comics featuring Megan]]
 
[[Category:Biology]]
 
[[Category:Nobel Prize]]
 

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