Screening for a Hidden Syndrome
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
Two babies both have cleft lip and palate, and you examine each for other features. Baby S (a different patient) has small paramedian pits on the lower lip, webbing behind the knees, and a father with lip pits across three affected generations. Baby Mateo has the cleft but no lip pits, no other anomalies, and no confirmed affected relatives. A phenotype is everything you can observe; the clinical question is whether the cleft comes with extra features that travel together. Baby S clearly does. Mateo, on a careful exam, does not.
Piece 2 of 2
Van der Woude syndrome (VWS) is the most common syndromic form of cleft. From the research library: VWS is autosomal dominant and accounts for about 2% of all cleft lip and palate cases. Its hallmark is lower-lip pits (small paramedian depressions). About 44% of affected people have lip pits ALONE, with no cleft, which is exactly why mild carriers get missed. Roughly 70% of VWS is caused by loss-of-function changes in a gene called IRF6. So one person in a family might have a full cleft while a parent has only two tiny pits and never knew they carried anything.
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.