Clue 1: Orient yourself
Which part performs each job?
Use the labels and the picture's left-to-right, near-to-far, or before-and-after order. Name only what you can point to.
The question
Why can one tiny change break one job while another job keeps working?
Why it matters: Genetic results can change family counseling and research decisions. They must be interpreted without turning risk into destiny or an uncertain variant into a diagnosis. Today you practice the professional reasoning behind that work: Protein domains are specialized working regions, so a variant's position helps predict which function may fail.
On your WebXam
Using a domain map to predict a variant's effect from its location
For life
Having a gene is not the same as using it.
Principle: Having it is not using it
Five principles we return to
Having it is not using it
Same instructions, different switches
Same look, different cause
Change one thing and watch
Boss or doorman?
Decides the result or only allows it
Held down, not gone
Remove the brake and it returns
Many roads, one ending
One result can begin many ways
Try the everyday version first
A multi-tool has separate working sections
A multi-tool places several tools in one handle. Damage to one section can remove one function while the other sections still work.
Do not jump to the biology yet. Treat the picture as a small system. Track its parts, follow one change at a time, and keep more than one explanation open until the picture supplies a way to separate them.
Clue 2: Trace one change
Would damage to the handle equal damage to the gripping tip?
Follow one object, stage, or path. Point to the first place where the situation changes instead of jumping to the ending.
Clue 3: Keep the cause open
Why map a defect before testing function?
List more than one explanation that still fits. Name the extra observation that would help you separate those possibilities.
Now inspect the illustration
Work from the visible evidence. A useful answer names the part of the picture that supports it and leaves unknown causes open.
- 1Which part performs each job?
- 2Would damage to the handle equal damage to the gripping tip?
- 3Why map a defect before testing function?
Tier 1 check
Finish with the everyday model
Use the everyday picture to answer today's question in plain words: Why can one tiny change break one job while another job keeps working?
You can complete today's required check without opening the technical details below.
Ready for the real names? Optional tier 2
Technical rules and limits
Rule 1: Proteins contain functional domains.
Rule 2: Domain position narrows the likely disrupted job.
Rule 3: Unstructured regions can still matter even when less conserved.
Where the analogy stops: Protein domains fold in three dimensions and interact dynamically, unlike a simple tool.
Carry the previous idea forward
A regulatory variant changes when or how much a gene is used without changing the protein sequence.
Today's technical takeaway
Protein domains are specialized working regions, so a variant's position helps predict which function may fail.
Now map the same rules onto biology
Place variants on the IRF6 domain map
Gripping tip
DNA-binding domain
Joining section
Protein-interaction domain
Tool layout
IRF6 amino-acid domain map
Educational illustration, not a clinical photograph or diagnostic result. Use the labeled evidence cards and claim ceiling.
Mateo's case file: evidence supplied in this lesson
GEN10-E1
IRF6 is 467 amino acids long.
Why it matters: Variant position can be recorded precisely.
GEN10-E2
The N-terminal DNA-binding domain spans roughly residues 7 to 115.
Why it matters: Variants there may alter DNA recognition.
GEN10-E3
The C-terminal SMIR/IAD region supports protein interactions.
Why it matters: Different domains support different molecular jobs.
Make the clinical decision
You are choosing a functional assay for an IRF6 variant.
Variant A lies in the DNA-binding domain; variant B lies in the C-terminal interaction region.
ATest DNA binding for A and partner interaction for B.
BUse the same unrelated assay for both.
CClassify both from location alone.
Choose the assay plan and cite the domain-function evidence.
Evidence required
GEN10-E1 + GEN10-E2 Claim ceiling
You may select assays from domain location. You may not classify a variant without results and other evidence.Go deeper Optional tier 3
Everything required for today is above. Open these only if you want the explainer, source trail, or download files.
The everyday model and Tier 1 check are the complete required path for this lesson.
Use these checks to keep your place. They are not turned in through the portal.
Check off as you finish
- Worked through the everyday picture and answered its three questions.
- Completed the Tier 1 check in plain words.
Turn in: Genetics lesson 10: What the IRF6 Protein Looks Like
Go to Schoology to turn this in.
Submit one PDF. Put your first and last name in the document header. Name the file: FirstName LastName - Assignment Title - YYYY-MM-DD.pdf.
Open Schoology PDF upload helpIf you cannot get in, see Mr. Mendoza. Do not skip the work.
Optional legacy technical materials Open only if you want the original notes, vocabulary, artifact, and CER work
Before this page, you should know
- A changes the sequence; a changes a control region and alters how much protein is made, without changing the sequence.
- IRF6 has an called MCS-9.7 about 10 kb where the AP-2alpha (TFAP2A) normally docks to switch IRF6 on.
If not, review
Today's new idea is only
A 's shape determines its job, so where a variant lands on the protein predicts what job it breaks.
Goal: Students will describe the IRF6 's two-domain architecture (a and a protein-binding SMIR/IAD domain) and explain why a variant's domain location predicts its effect.
Know by the end
- A is a part of a that folds on its own and does a specific job.
- IRF6 (467 amino acids) has a (residues 7 to 115, a winged-helix fold) and a C-terminal -binding (SMIR/IAD) domain, joined by a disordered linker (residues 121 to 156).
- changes are statistically enriched in the but not the .
- means a 's shape determines its job, so a variant's domain location predicts what job it breaks; a truncating change deletes whichever domains come after the cut.
1
What a domain is
Model start: A is a self-folding part of a that carries out a specific function.
- A is a part of a that folds on its own and does a specific ____.
- IRF6 has two domains joined by a floppy linker.
2
IRF6's two domains
- The (residues 7 to ____): a winged helix that clamps onto ____ so IRF6 can switch target genes on; most damaging , including R84, land here.
- The (SMIR / IAD, near the C-end): links IRF6 to ____ proteins so it can work as part of a team.
3
Structure-function
- A 's shape determines its job, so WHERE a variant lands predicts WHAT job it breaks.
- A change in the wrecks DNA gripping; a truncating change deletes whichever domains come ____ the cut.
Everything you need for today is on this page. These links are optional.
What to read
Read the short plain-language explanation written for this lesson. Plain-language explainer for this lesson
Why this source matters
This explanation gives you the background for today's idea without making you decode a research paper: A 's shape determines its job, so where a variant lands on the protein predicts what job it breaks.
Reading moves
- 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.
Stop point
Stop after the final 'Use it now' section. The research citations are available separately for advanced readers.
Your output
Write one claim-evidence sentence: state the main idea, then name the example or evidence that supports it.
Where this fits
Tested on (Ohio WebXam)
Genetics of Disease · 072130
PLTW lesson
MI · Genetics domain · Unit 4 When Organs Fail, 4.1 Manufacturing Human Proteins (protein structure)
WebXam domain
Molecular and Genetic Technology
Evidence to produce
Place three relatives' variants on the IRF6 domain map (a missense at residue 60, a missense at residue 424, and a nonsense at residue 100) and predict the consequence in one sentence each, naming the domain hit or lost and the job affected.
Lab / skill
Medical Interventions (MI) · Principles of Biomedical Science (PBS)
Everything required for today's decision is already in the case file and plain-language explainer. The links below are original papers and database records for teachers and advanced readers, not assigned student reading.
How this is graded (rubric)
For: Place three relatives' variants on the IRF6 domain map (a missense at residue 60, a missense at residue 424, and a nonsense at residue 100) and predict the consequence in one sentence each, naming the domain hit or lost and the job affected.
| 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. |
How the model answer scores against this rubric
- CompleteProficient: Nothing is left blank: the model fills every part of "Place three relatives' variants on the IRF6 domain map (a missense at residue 60, a missense at residue 424, and a nonsense at residue 100) and predict the consequence in one sentence each, naming the domain hit or lost and the job affected.".
- 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.
What's next: Our has critical domains. How can we tell which parts are so important that evolution never lets them change?