Is This Gene Important Across Species?
Take the reading one piece at a time. For each piece: read it once, underline the sentence that says what happens, then look up any word in the list. Tap a word to see its definition.
Piece 1 of 2
BLAST is a computer tool that lines up two sequences and reports the percent identity, the fraction of positions that match. Here two short stretches of IRF6 are lined up across human, mouse, chicken, frog, and zebrafish, each a different ortholog. A dot means the same amino acid as human; a letter means that species differs.
Piece 2 of 2
The first stretch sits inside the DNA-binding domain, around position 84, where the protein grips DNA. Across all five species shown it reads almost entirely as dots: essentially no change. The second stretch sits in the floppy linker that connects the two domains (residues 121 to 156), and it is full of letters: many species differ at many positions. These animals last shared an ancestor hundreds of millions of years ago, so a stretch that stays frozen across all of them is not a coincidence. The real Leslie 2012 study aligned IRF6 across 17 species and found the DNA-binding domain almost unchanged.
Reading the Research
- Skim the title and abstract first to get the gist.
- Circle the one sentence that states the main claim.
- Box the evidence the authors give for that claim.
- Mark one sentence that confuses you, and move on.
Now put it together: In one or two sentences, say what this whole reading is telling you about Mateo. Then go back to the lesson and fill in the guided notes.