Talk:DNA microarray: Difference between revisions

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==Terms==

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== Channel and Colour ==

[[ImageFile:MicroarrayDNA microarray experiment.svg|thumb|30px50px]]

this article uses the word colour to describe the two differently "coloured" dyes. In reality when talking about dyes one uses the word "channel", which is much more precise (there is not only the dye but also the laser and filters) and used in the official lingo (not only reguarding flourescence: it is even in photoshop, say, to do a colour overlay) but not socially. furthermore Cy3 and Cy5 when you look at them in solution they are deep blue and purple! Is colour used for ease of comprehension or is it a minor error? 3-channel microarrays also exist (red, blue and UV)--[[User:Squidonius|Squidonius]] ([[User talk:Squidonius|talk]]) 12:17, 5 April 2008 (UTC)

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My edit on statistics was changed to resemble how it was before, despite being misinformative: Microarray analysis is a pain because the data is '''Relative''' (condition A vs. B, not gene xx in A is xx pmol) and you start with an '''image''', Analysis of SAGE data has only a fraction of the problems microarrays have, yet have lots and lots of data, so size is not #1 issue. If someone else feels so, please amend. --[[User:Squidonius|Squidonius]] ([[User talk:Squidonius|talk]]) 12:48, 16 November 2009 (UTC)

:Since I was the one changing the section in question, here is my response. The previous version was quite poorly worded, inviting exactly those sorts of misconceptions that it was trying to resolve. One issue that you raise is the "relativity" of the data in microarrays, which is misleading as most data are expressed as relative values (eg. concentrations, gene expression relative to a normalization genes). Overall, what you may be referring to, but what was not properly addressed, are the challenges posed by the signal-to-noise ratio, whose magnitude in microarray analysis is affected by things like hybridization (chemical noise), scanning (electronic noise), and probably most important, biological variation. So, to overcome these distinct set of challenges, algorithms have been developed, such as background subtraction, data normalization, and biological replication coupled with statistical methods that deal with issues such as multiple testing, normalization of variances, etc. that attempt to address these issues. I'm open to meaningful delineation of these issues in a new section that looks at these from a measured perspective, but I'm opposed to lumping them all together by merely saying that there are "sheer volumes of data" and "several normalization methods in the published literature" (without referencing these)—this is not helpful, as it only restates the well-known fact that microarray analysis is difficult. My modifications were aimed at recasting somewhat meandering sentences, thus trying to focus the discussion to invite further additions. [[User:Malljaja|Malljaja]] ([[User talk:Malljaja|talk]]) 15:47, 16 November 2009 (UTC)

== principle figure ==

Better to use the term probe than feature, because it is microarray (northern blot)-specific. <small><span class="autosigned">—&nbsp;Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[User:Pain-proof|Pain-proof]] ([[User talk:Pain-proof|talk]] • [[Special:Contributions/Pain-proof|contribs]]) 01:07, 7 January 2015 (UTC)</span></small><!-- Template:Unsigned --> <!--Autosigned by SineBot-->

== "citation needed" ==

Under the Data analysis section is "...in the case of commercial platforms, the analysis may be proprietary.[citation needed] "

Here is one citation, where the company clearly states their algorithm is proprietary: [http://prosigna.com/x-us/overview/prosigna-algorithm/] <!-- Template:Unsigned IP --><small class="autosigned">—&nbsp;Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/184.100.44.130|184.100.44.130]] ([[User talk:184.100.44.130#top|talk]]) 00:29, 9 June 2017 (UTC)</small> <!--Autosigned by SineBot-->

== Huh? ==

I like to think of myself as fairly scientifically literate, but after skimming through this page, and a couple of other web descriptions, I still don't understand what DNA chips are.

The most fundamental issue to explain seems missing: is this an actual biological sample taken from a living being (human or whatever) that's somehow affixed to a solid surface, or is this a purely synthetic pattern affixed to a microscope slide or other support? If the latter, why not just encode it into a computer program, why bother with a physical form at all?

I think that the people who've written about this (here on Wikipedia and elsewhere) know too much about the subject, and don't know how to introduce it to an audience who know nothing about it. I think the page should start with a much more basic explanation of what's being discussed. <!-- Template:Unsigned IP --><small class="autosigned">—&nbsp;Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/74.104.100.218|74.104.100.218]] ([[User talk:74.104.100.218#top|talk]]) 20:53, 30 August 2019 (UTC)</small> <!--Autosigned by SineBot-->

I agree with this. It's a comprehensive article, but very difficult to get into for the beginner.

Would it be OK to rewrite the introduction using some assumptions/simplifications? Like, for example, I think it would help if the introduction just mentioned that DNA microarray can measure SNPs and gene expression, define what that is, and then briefly mention that other types exists. Because right now it's written in such a comprehensive way, keeping open to all the many different types of microarray (tilling, microRNA, etc). But that makes it hard to read. And really gene expression and SNP genotyping, is by far the largest applications by count of samples (and I'd even argue SNP genotyping alone would be the most important, given gwas+DTC industry) [[User:Yinwang888|Yinwang888]] ([[User talk:Yinwang888|talk]]) 05:32, 11 February 2020 (UTC)

: I replaced the header figure. It was very specific on a sub-aspect on where probes of gene expression microarrays bind. Instead there now is an overview video. I hope that helps. I didn't delete the previous figure though, merely moved it down a bit [[User:Lassefolkersen|LasseFolkersen]] ([[User talk:Lassefolkersen|talk]]) 10:42, 14 May 2020 (UTC)

:: Very nice video! Very illustrative. Cool that you have made a Chinese version, but your pronounciation sucks. Good thing you put in subtitles. May I ask if you are Lasse Folkersen of impute.me? I am a big fan of that site. Why is there no wikipedia article for that? [[User:Yinwang888|Yinwang888]] ([[User talk:Yinwang888|talk]]) 08:56, 27 May 2020 (UTC)