An awkward family reunion: Sea monsters are our cousins
KANSAS CITY, Mo., Feb. 21, 2024 /PRNewswire/ -- The sea lamprey, a 500-million-year-old animal with a sharp-toothed suction cup for a mouth, is the thing of nightmares. A new study from the Stowers Institute for Medical Research discovered that the hindbrain—the part of the brain controlling vital functions like blood pressure and heart rate—of both sea lampreys and humans is built using an extraordinarily similar molecular and genetic toolkit.
- The team unexpectedly uncovered that a crucial molecular cue is very broadly required during vertebrate hindbrain development.
- Because most vertebrates, including humans, have jaws, this striking difference in sea lampreys makes them valuable models for understanding the evolution of vertebrate traits.
- Surprisingly, they found that the sea lamprey core hindbrain circuit is also initiated by retinoic acid, providing evidence that these sea monsters and humans are much more closely related than anticipated.
- "People thought that because sea lampreys lack a jaw, their hindbrain was not formed like other vertebrates," said Krumlauf.