Mysterious ‘gene within a gene’ found in the coronavirus

Researchers have uncovered a mysterious gene in the genetic code of the coronavirus SARS-CoV-2 – a segment virtually hidden from view in the virus’s genome, and largely overlooked until now.

The newly identified gene – called ORF3d – is an example of what’s called an overlapping gene: a kind of ‘gene within a gene’ that’s effectively concealed in a string of nucleotides, because of the way it overlaps the coded sequences of other genes.

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