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In the online articles I'm reading, I see the authors mention gene dosage and copy number. My confusion is regarding if the two terms mean exactly the same thing - number of copies a gene occur in the genome?

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They don't always mean the same thing, as gene dosage may be measured by RNA-Seq, whereas copy number by DNA sequencing / other means. But people do use it as rough substitutes. Often people do try to infer copy number from RNA-Seq, as samples tend to fall in "digital" intervals of expression, and use CNV to estimate gene dosage.

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