Question about Illumina Infinium 450K
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3.0 years ago
99syzygy • 0

Hi Bioinformaticians,

Could you possibly help me understand in simple terms what is a "probe" (ex: cg06928838 (GSTP1 gene)) in an Infinium HumanMethylation450K BeadChip and how is a probe "made"? I mean to get methylation values.

Am I correct in saying that probes target specific loci of genes, not the whole gene to get a methylation value?

I would appreciate all responses. Thanks!

Methylation Beta value Probe Infinium • 646 views
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Entering edit mode
3.0 years ago

You are correct: the 450k array provides methylation for CpG sites (or genotypes for some sites, and some methylation for individual sites that aren't in the CpG context).

You'll need to use some sort of method to define regions from your site signal (or at least have site annotations and your own way of looking for consistent signal among nearby sites).

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