The Hidden Regulatory Variant
Genetics domain · Lesson 9 of 20 · Medical Interventions (MI), with PBS overlap
Today's goal: Students will distinguish coding from regulatory variants and explain how the common nonsyndromic cleft-lip risk variant rs642961 raises risk by disrupting an AP-2alpha enhancer instead of changing the protein.
This is a model of the work you should turn in. Use it to check your own: match the structure and the level of detail, do not copy it. Your wording should be your own.
Counselor's note for the family:
- This variant (rs642961) does not change the IRF6 protein at all. Instead it sits in a nearby switch region (the MCS-9.7 enhancer) and breaks the spot where a helper protein, AP-2alpha, normally docks, so IRF6 gets turned down in the lip-forming tissue.
- Carrying the A version is a risk factor, not a guaranteed cause: isolated cleft lip is multifactorial, so this common variant nudges risk up a little and adds to many small factors, rather than guaranteeing a cleft.
This model shows the level of evidence and organization needed to complete: A two-sentence family explanation distinguishing a regulatory risk allele from a protein-changing mutation.
- Write one defensible claim.
- Choose specific evidence that supports the claim.
- Explain the scientific rule that connects the evidence to the claim.
Keep the structure. Replace the question, facts, measurements, and evidence. Then recheck units, vocabulary, and whether the conclusion goes beyond the evidence.
Also due today: Keep the language plain enough for a family with no genetics background.
The finished product above did not appear all at once. Here is the path from the question to the turned-in work, so you can follow the same steps.
- 1Start from today's question: Why do most kids with a carry no broken instruction at all?
- 2Work the Model and the Explore questions to reason it out before writing anything.
- 3Pull the specific evidence the product needs from the reading and any database you used.
- 4Write it up in the required format: In the 's note, write two sentences for the family: one explaining that rs642961 does NOT change the IRF6 but turns it down by breaking a switch, and one stating why it is a , not a guaranteed cause.
- 5Check it against the rubric, then submit.
| Criterion | Proficient | Developing | Beginning |
|---|---|---|---|
| Complete | Every required part of the artifact is present and filled in. | Most parts are present, but one is missing or left blank. | Several parts are missing. |
| Accurate | The science and data are correct and match the evidence. | Mostly correct, with a small factual slip. | Key science or data is wrong. |
| Scientific reasoning (CER) | States a claim, backs it with specific evidence, and explains the reasoning. | Has a claim and evidence, but the reasoning is thin or missing. | Gives an answer with no evidence or reasoning. |
| Professional communication | Clear, organized, and labeled the way a clinician or scientist would write it. | Readable but disorganized or missing labels. | Hard to follow. |
| Submitted | Turned in through the route named under Submit here and confirmed. | Turned in, but in the wrong place or unconfirmed. | Not turned in. |
- CompleteProficient: Nothing is left blank: the model fills every part of "In the genetic counselor's note, write two sentences for the family: one explaining that rs642961 does NOT change the IRF6 protein but turns it down by breaking a switch, and one stating why it is a risk factor, not a guaranteed cause.".
- AccurateProficient: Every number and claim matches the case evidence.
- Scientific reasoning (CER)Proficient: It names a claim, cites the specific evidence, and explains the reasoning, not just the answer.
- Professional communicationProficient: It is organized and labeled like a real chart note.
- SubmittedProficient: It would be attached to your class form or handed in, and confirmed.
One exam-style question that uses exactly what you practiced today. Try it before you reveal the answer, then read why each choice is right or wrong.
Tap an answer to see the full explanation. Nothing is recorded or graded.
It builds this reusable test skill: Distinguishing a regulatory risk allele from a protein-coding mutation.
- Name the concept or data pattern being tested.
- Cross out choices that violate that rule or the evidence.
- Justify the best remaining choice before checking the answer.