What Is Mateo's Complete Genetic Story?
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
Each link below was a lesson, and the Domain Report turns this list into one connected argument. Clue: an isolated (nonsyndromic) cleft, told apart from a syndromic one because lip pits are the tell for Van der Woude. Gene: IRF6 on chromosome 1q32.2. Variant: coding variants (such as R84C or truncations) cause syndromes, while the common regulatory SNP rs642961 lowers IRF6 by breaking an AP-2alpha enhancer site. Protein: IRF6 has a DNA-binding domain and a protein-binding domain, and loss of function gives haploinsufficiency. Network: IRF6 works with GRHL3 and downstream of p63 to build the periderm so palatal shelves fuse. Proof: knockout and rescue in mouse and zebrafish prove IRF6 is causal. Population: risk variants and their strength differ by ancestry (8q24 strong in Europeans, weak or absent elsewhere; rs642961 fails to replicate in African-ancestry samples). Risk: the family recurrence risk is empiric and multifactorial, roughly 2 to 5%. Treatment: molecular fixes work in animals only, all preclinical. Ethics: somatic vs germline, and equity of access, frame whether to act.
Piece 2 of 2
Mateo's case pulls these together into one diagnosis: an isolated, nonsyndromic, multifactorial cleft lip and palate, with IRF6 standing as the exemplar gene of the periderm pathway behind it.
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.