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Figure 2 | BMC Genomics

Figure 2

From: The mitochondrial genome of the hexactinellid sponge Aphrocallistes vastus: Evidence for programmed translational frameshifting

Figure 2

Linearized genomes of all sequenced poriferan mtDNAs. Side-by-side comparison of the mtDNAs of A. vastus and the previously published hexactinellid sponge mtDNAs reveal a large syntenic gene block: atp6-cox3-nad2-nad5-trnF-trnC-nad1-trn(L, I, N, Y)-cob. Variable gene arrangements among the hexactinellids include, but are not limited to, the order of cox2-rnl, the transposition of nad3, and the presence and location of nad6. Demosponges (excepting the homoscleromorph O. carmela) retain the syntenic block cox2-atp8-atp6-cox3 which is highly conserved throughout much of the animal kingdom, while the hexactinellids have lost atp8 and translocated cox2.

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