Fig. 1

Overview of the Sgs1-Sgs3-Sgs7-Sgs8 protein family in Drosophila. A Conserved amino acid motifs in Sgs proteins. The column height indicates conservation of the sequence at that position while the height of the amino acids within the column shows relative frequency. Orange boxes indicate conserved sequences within signal peptides. Dotted lines indicate blocks of less conserved amino acid sequences. Numbers indicate the positions of the amino acid in the corresponding D. melanogaster protein, or in D. suzukii for Sgs3x as this protein is absent in D. melanogaster. All the Sgs1–3–7-8 genes contain a phase 1 intron disrupting the signal peptide sequence whose position corresponds to amino acid position 10. B Maximum likelihood unrooted tree of Eig71Ee, Sgs1, Sgs3, Sgs3x, Sgs7 and Sgs8 amino acid sequences from all studied species. Gene names and colors were attributed based on synteny information (see text for details). Numbers on branches represent bootstrap values. Note that most bootstrap values are low, due in part to the small number of amino acids composing the Sgs7 and Sgs8 proteins