Rough draft.This research track is under review with Dr. Atit's lab. Content and sequence may still change.

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What Does IRF6 Actually Do in the Embryo?

Genetics domain · Lesson 14 of 20 · Medical Interventions (MI), with PBS overlap

Today's goal: Connect the IRF6 gene to a single cell behavior, periderm differentiation, and trace how losing that behavior turns a gene change into a physical cleft.

Learn first

What a finished product looks like

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.

Gene-to-cleft chain for the PBS team

Completes: A short causal chain that links the molecular variant to the failed structural event using the correct cell-biology terms.

Chain from gene to cleft:

The IRF6 variant breaks the protein so it can no longer turn on its target genes in the epithelium.
Without working IRF6, the periderm (the non-stick top layer) fails to differentiate.
With no proper periderm, the palatal shelves stick to the wrong surfaces, such as the tongue, and cannot swing to the midline.
Because the shelves never meet, fusion does not happen and the palate stays open, which is the cleft.

Key detail: IRF6 had to be in the periderm cells themselves (cell-autonomous), so the failure is specifically in those cells.

Check yourself

Worked Claim, Evidence, Reasoning (from the database)

Here is the whole reasoning move done once, on the same kind of evidence you will pull from the tool. Read how the claim, the actual value from the database, and the reasoning fit together, then write your own the same way.

Evidence from GEO (Gene Expression Omnibus)Open the tool

The question: We claim IRF6 does its job in the palate periderm. Is there expression evidence that IRF6 is actually switched on in that exact tissue, and that it falls when the periderm fails?

C
Claim. IRF6 is expressed in the palatal periderm at the time of fusion, which is required for that tissue to do its job.
E
Evidence (what the tool actually showed). GEO craniofacial profile: IRF6 reads HIGH in palatal-shelf periderm samples and LOW in non-fusing control tissue; in an Irf6-knockout dataset, downstream periderm genes (GRHL3, KLF4) drop. FaceBase imaging places IRF6 activity at the medial edge epithelium (MEE), the surface that must seal.
R
Reasoning (from the result to the inference). A gene can only cause a structure to fail if it is active in that structure at the right time. Seeing IRF6 high in the periderm exactly when the shelves fuse (GEO, how much) and located at the medial edge they must seal (FaceBase, where) ties the molecular cause to the physical event. The drop in IRF6's target genes when IRF6 is removed shows the periderm program collapsing, which is the cell-behavior failure that leaves the palate open.

Now write your own. Look up your variant or gene, read the value, then go result inference, just like this.

Learn first

How this was built, step by step

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: What job do the cells controlled by IRF6 perform, and how does losing that job cause the shelves to fail to fuse?
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: Brief the Developmental (PBS) team. In three or four sentences, explain the chain from an IRF6 variant down to a physical : variant to broken to lost cell behavior to failed . Use the words , differentiate, and fusion correctly.
5Check it against the rubric, then submit.

How this is graded (rubric)

For: Brief the Developmental (PBS) team. In three or four sentences, explain the chain from an IRF6 variant down to a physical cleft: variant to broken protein to lost cell behavior to failed fusion. Use the words periderm, differentiate, and fusion correctly.

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 the right way (Schoology for routine work) and confirmed.	Turned in, but in the wrong place or unconfirmed.	Not turned in.

How the model answer scores against this rubric

CompleteProficient: Nothing is left blank: the model fills every part of "Brief the Developmental (PBS) team. In three or four sentences, explain the chain from an IRF6 variant down to a physical cleft: variant to broken protein to lost cell behavior to failed fusion. Use the words periderm, differentiate, and fusion correctly.".
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 turned in on Schoology and confirmed.

Check yourself

WebXam problem for today's skill

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.

WebXam-style domain: Bio-Molecular TechnologySelf-check skill: Tracing a gene to a cell behavior to a structural outcome

In Irf6-knockout mice, the periderm fails to differentiate, the palatal shelves form abnormal adhesions to the tongue, and the palate does not close. What is the best explanation of how losing IRF6 produces the cleft?

Tap an answer to see the full explanation. Nothing is recorded or graded.

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