Meaning of the annotations of CDS for NCBI virus

Question

[9606]

Hi all,

in some references of NCBI, for example Sars-cov-2: https://www.ncbi.nlm.nih.gov/nuccore/NC_045512

some CDS are represented as: join(266..13468,13468..21555)

What does it means? The product is a protein where the it looks like the nucleotide at position 13468 has been used twice. How is the correct interpretation?

[GenoMax]

That particular annotation also includes following information:

join(266..13468,13468..21555)
                     /gene="ORF1ab"
                     /locus_tag="GU280_gp01"
                     /ribosomal_slippage
                     /note="pp1ab; translated by -1 ribosomal frameshift"

You can see the protein complement of SARS-CoV-2 virus in this table. This is probably a bit of a moving target since we are still understanding all things that this virus is capable of doing including its genome.

[microfuge]

To add the site join(266..13468,13468..21555) has a note /note="pp1ab; translated by -1 ribosomal frameshift"