Duplicações genômicas ajudaram plantas com flores a sobreviver a extinções em massa

08 de maio de 2026

Reportado por IA

Cópias extras de material genético parecem ter impulsionado a sobrevivência de plantas com flores durante as principais crises ambientais da Terra, incluindo o evento que dizimou os dinossauros.

Um estudo com 470 espécies de angiospermas encontrou 132 duplicações genômicas antigas que se agruparam em torno de nove períodos de convulsão entre 108 milhões e 14 milhões de anos atrás. Estes incluíram mudanças climáticas, alterações nos níveis de oxigênio e extinções em massa, como o impacto do asteroide há 66 milhões de anos no final do período Cretáceo.

Study suggests the route to whole-genome doubling influences whether DNA-doubled cells survive

25 de maio de 2026 Reportado por IA Imagem gerada por IA Verificado

Researchers at Hokkaido University report that cells left with an extra set of DNA after a division error can have markedly different outcomes depending on how the division fails—findings that could help explain why some abnormal cells persist in diseases where whole-genome duplication is common, including cancer.

DNA study uncovers strawberry's ancient genome mergers

Scientists have developed a new method using transposable elements to trace the evolutionary history of complex plant genomes. The approach was tested on the cultivated strawberry and identified multiple ancient hybridization events that shaped its octoploid genome.

Study finds asexual reproduction slowed early animal evolution

10 de junho de 2026 Reportado por IA

A new study suggests Earth's first animals evolved slowly because they reproduced asexually, limiting competition in ancient oceans. Researchers from the University of Cambridge say a later shift to sexual reproduction helped drive a surge in biodiversity during the Ediacaran period.

Science

Study solves mystery of reptile bone armor evolution

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Freeze-thaw cycles aided evolution of early cell-like structures

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Chicxulub impact site stayed hot for 8 million years

Ancient Denisovan DNA still shapes human immunity today

A new study from Yale University shows that DNA inherited from extinct Denisovans continues to affect immune function and skeletal development in people from Near Oceania. Researchers sequenced genomes from 177 individuals across 12 populations and identified over 3,100 active genetic variants. The findings were published June 11 in the journal Science.

Meteor impacts may have sparked life on early Earth

04 de abril de 2026 Reportado por IA

Scientists suggest that asteroid impacts created hot, chemical-rich environments that could have kick-started life on Earth. A new review led by recent Rutgers graduate Shea Cinquemani highlights impact-generated hydrothermal systems as potential cradles for life's building blocks. These systems may have persisted for thousands of years, providing ideal conditions for early biology.

quinta-feira, 18 de junho de 2026, 21:11h

Duplicações genômicas ajudaram plantas com flores a sobreviver a extinções em massa

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