As per the recent study, 80 million years ago, humans, rats, and mice shared a common mammalian ancestor.
o Result: Excessive protein production → sperm-producing cells died → mice became infertile.
o Inference: Any mutation in the UCE affecting protein regulation could lead to loss of sperm production and infertility, preventing the UCE’s transmission across generations.
o DNA Structure: A double-helix molecule made of four bases, held together by base-pair bonding.
o Genes: Short DNA segments (~a few thousand base-pairs long) that encode proteins.
o mRNA Formation: DNA sequence is copied into messenger RNA (mRNA).
o Translation at Ribosome: mRNA guides protein synthesis by stitching amino acids together.
o Stop Codons: Specific sequences in mRNA signal the ribosome to stop protein synthesis.
o Identification of UCEs: Defined as >200 base-pair DNA sequences with perfect identity across human, rat, and mouse genomes.
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