Scientists have recreated the genome of the great-grandfather of all mammals: some relationships have not changed for 300 million years

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Scientists have recreated the genome of the great-grandfather of all mammals: some relationships have not changed for 300 million years

DNA sets of more than three dozen living species had to be examined in order to reconstruct the genome of the progenitor.

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The great-grandfather of all mammals on Earth walked the planet approximately 180 million years ago. It is his scientists who consider the earliest known ancestor of all mammals from blue whales, koalas, rhinos and even us humans, writes New Atlas.

An international group of scientists set out to restore the genome of a long-dead ancestor. To do this, scientists studied the DNA sets of more than three dozen living species. This list also includes the genomes of humans, manatees, mice, rabbits, wombats and pangolins. Scientists compared this group with the genomes of chickens and Chinese alligators, which do not belong to the class of mammals.

During the study, scientists found 1215 blocks of genes that are consistently repeated on the same chromosome in all 32 mammalian species that they studied.

After analyzing the data, the researchers believe that our distant ancestor and progenitor had 21 chromosome, including two sex and 19 autosomal. The scientists also found 9 complete chromosomes or their fragments, in which the gene order coincided with the chromosomes of modern birds – it turns out that some genetic sequences have remained stable for more than 300 million years.

Scientists have recreated the genome of the great-grandfather of all mammals: some relationships have not changed for 300 million years

Scientists have recreated the genome of the great-grandfather of all mammals: some relationships have not changed for 300 million years< /p>

At the same time, scientists have discovered gene sequences that are less resistant to breakage and rearrangement – apparently, it was they who controlled genetic evolution.

Researchers were also able to scroll the development of chromosomes forward and found rearrangements in different lines . For example, about 66 million years ago, when dinosaurs died out on Earth and mammals became the dominant group, there was an acceleration of genetic restructuring.