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Jawless fish brains more similar to humans than thought
The brain structures of jawless fish may not be as different from jawed vertebrates including humans as earlier thought, Japanese researchers have discovered.
Tokyo: The brain structures of jawless fish may not be as different from jawed vertebrates including humans as earlier thought, Japanese researchers have discovered.
While jawed vertebrates share many developmental characteristics that have remained unchanged for millennia, the findings suggest that complex divisions in the vertebrate brain first appeared before the evolution of jaws, more than 500 million years ago.
The study showed that two elements of brain genoarchitecture or gene-expression patterns thought to be unique to jawed vertebrates are actually present in two jawless fish - the hagfish and lamprey, the only jawless fish alive today.
The brain's basic developmental plan was thought by many scientists to have reached completion in jawed vertebrates because the brains of lampreys and hagfish seemed to lack these two key domains.
