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Fig. 3 | BMC Ecology and Evolution

Fig. 3

From: Horizontal gene transfer and recombination analysis of SARS-CoV-2 genes helps discover its close relatives and shed light on its origin

Fig. 3Fig. 3

Putative horizontal gene transfer events found for 11 main genes and the RB domain of 25 SARS-CoV and SARS-CoV-2-related viruses. Left part of each portion of the figure shows the gene tree and its right part shows the species tree (i.e. whole genome tree) into which statistically significant horizontal gene transfers are mapped. Full lines represent complete gene transfers (i.e. when a complete copy of the donor’s gene is incorporated into the recipient genome; this accounts for intergenic recombination) and dashed lines represent partial gene transfers (i.e. when a mosaic gene is formed by recombination of two homologous gene sequences; this accounts for intragenic recombination). Numbers on the internal branches represent their bootstrap scores. Transfer directions are represented by arrows (when the direction is not certain, the arrow is bidirectional). Gene fragments transferred from the donor organism are indicated between brackets and followed by the transfer bootstrap score calculated by the Partial HGT-Detection program [7]

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