What Does IRF6 Actually Do in the Embryo?
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
During development the two palatal shelves grow toward the midline and must touch and fuse. The outer epithelium has a special top layer called the periderm. Think of the periderm as a non-stick coating: it keeps surfaces from sticking to the wrong partner (like the tongue) until the right surfaces meet, then lets the shelves fuse cleanly at the correct seam. When IRF6 works, the periderm differentiates, the shelves meet at the midline, and the palate closes. When IRF6 is lost, no proper periderm forms, the shelves stick to the tongue and to wrong surfaces, and they cannot reach the midline.
Piece 2 of 2
The real mouse and zebrafish data show this directly: the periderm fails to differentiate, palatal shelves form abnormal adhesions to the tongue and to each other, those adhesions physically restrain the shelves so they cannot swing to the midline, and downstream genes (GRHL3, KLF4 and KLF17, keratins, esrp1) drop. Crucially, putting IRF6 back only in the deeper basal layer was not enough; IRF6 had to be in the periderm cells themselves.
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.