Studi University of Michigan tantang teori evolusi netral

Sebuah studi baru dari University of Michigan menunjukkan bahwa mutasi yang bermanfaat lebih umum daripada yang diperkirakan sebelumnya, namun sering gagal menyebar karena lingkungan berubah terlalu cepat. Penelitian ini mengusulkan pandangan revisi mengenai evolusi molekuler.

Para peneliti yang dipimpin oleh Jianzhi Zhang meneliti mutasi pada ragi dan E. coli menggunakan pemindaian mutasi mendalam. Mereka menemukan bahwa lebih dari 1 persen mutasi yang mengubah asam amino bersifat bermanfaat, yang menyiratkan bahwa lebih dari 99 persen substitusi seharusnya bersifat adaptif di bawah kondisi yang stabil. Namun, tingkat ini jauh melampaui apa yang diamati di alam.

Artikel Terkait

Microscopic view contrasting cell division errors: one surviving DNA-doubled cell and one dying cell, for cancer research news illustration.
Gambar dihasilkan oleh AI

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

Dilaporkan oleh AI Gambar dihasilkan oleh AI Fakta terverifikasi

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.

A federally funded mouse study has revealed that some inherited traits follow non-Mendelian patterns through epigenetic changes. The research identified hundreds of unexpected DNA methylation events across generations. It also documented the first known natural paramutation in a mammal.

Dilaporkan oleh AI

A 20-year experiment cloning mice has revealed that clones develop significantly more genetic mutations than naturally reproduced mice, accumulating to fatal levels after multiple generations. Researchers led by Teruhiko Wakayama at Yamanashi University in Japan found over 70 mutations per clone generation on average, three times higher than in controls. The findings, published in Nature Communications, raise concerns for applications in farming, conservation and de-extinction efforts.

Researchers at the Earth-Life Science Institute in Tokyo have shown through experiments that repeated freezing and thawing could have driven the growth and fusion of primitive cell-like structures on early Earth. Vesicles made with certain lipids fused into larger compartments and retained DNA more effectively during these cycles. The findings suggest icy environments played a role in life's origins.

Dilaporkan oleh AI

Researchers have discovered that distantly related butterflies and moths have used the same two genes, ivory and optix, for more than 120 million years to create similar warning colors on their wings. This finding suggests evolution can follow predictable genetic pathways rather than being entirely random. The study focused on species from South American rainforests.

Situs web ini menggunakan cookie

Kami menggunakan cookie untuk analisis guna meningkatkan situs kami. Baca kebijakan privasi kami untuk informasi lebih lanjut.
Tolak