This week’s “we thought it was junk but it turned out to be crucial” study comes with the added bonus that the so-called “junk” is also species-specific / taxonomically restricted. The general topic is tandemly repeated satellite DNA in the much studied fruit fly, Drosophila melanogaster. These satellite DNA regions comprise 15-20% of D. melanogaster’s genome, and one of the regions, AAGAG(n), is transcribed across many of D. melanogaster’s cell types. … read more