Question: Methylation 27K 450K, 850K, 2.5M: Why not plant more probes
gravatar for Shicheng Guo
4.9 years ago by
Shicheng Guo8.5k
Shicheng Guo8.5k wrote:

Hi All,

Illumina have brought out 27K, 450K, 850K one by one. What's the problem to plant more probes? Why can not we put out 2.5M or more probe in microarray.


2.5m 850k methylation 450k • 2.0k views
ADD COMMENTlink modified 3.7 years ago by Biostar ♦♦ 20 • written 4.9 years ago by Shicheng Guo8.5k
gravatar for andrew.j.skelton73
4.9 years ago by
andrew.j.skelton736.1k wrote:

Why illumina have staggered the release of human methylation arrays is unknown, most likely an in house decision. I can speculate that it may come from a number of reasons, most likely not to do with the number of probes per say, but likely the content of the probes. The bead array technology hasn't changed across all 3 releases of the human methylation series, so it's not to do with "how many beads can we fit on this silica chip", but more likely on characterising, testing, and validating all the capture sequences and where they target. This will more than likely be the last release we see of the humanMethylation chip series, as sequencing will become a cheaper and more profitable process, in a similar fashion to what's been happening with gene level expression.

ADD COMMENTlink written 4.9 years ago by andrew.j.skelton736.1k
gravatar for igor
4.8 years ago by
United States
igor12k wrote:

Adding more probes adds to the price. If you add more probes, the array becomes more expensive. Thus, it only makes sense to add more probes if the additional probes are informative. It's a lot of work to find millions of informative probes. Also, the arrays are mostly designed for clinical applications and they are sufficient for that purpose.

If you want all the CpGs in the genome, then you can do WGBS, so there is no need for an array-based solution.

ADD COMMENTlink written 4.8 years ago by igor12k
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