Researchers have just found a robust answer to the centuries-long mystery of which multicellular animal first existed on Earth.
The linkage of highly conserved gene sequences found within the same chromosome across all animals revealed an evident pattern. Sponges and more modern animals all share the same traits from a rare type of chromosome fusion and rearrangement event. But this was not present in the comb jellyfish, whose genomes are arranged more like the other unicellular animals.Rokhsar."We found a handful of rearrangements shared by sponges and non-ctenophore animals.
Like all comb jellies, the California sea gooseberry has eight sets of cilia running down its sides that they use to swim in search of food. "But the signal is there and strongly supports the 'ctenophore-branched-first' scenario. The only way the alternative sponge-first hypothesis could be true would be if multiple convergent rearrangements happened in both sponges and non-ctenophore animals, which is very unlikely."
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