Clue 1: Orient yourself
Which repair changes the original code?
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
Which repair changes the original code?
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: Gene editing, pathway rescue, and gene-dosage modulation are different strategies with different targets and risks.
On your WebXam
Distinguishing preclinical proof of concept from available human therapy
For life
One result can have many causes; the outcome alone never tells you which.
Principle: Many roads, one ending
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
Repair a program by editing code, changing settings, or adding a patch
A computer program can be changed at several levels. A developer may edit its instructions, adjust when they run, or add a temporary patch around a problem.
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
Which repair changes output without rewriting?
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
Which repair may work only during one window?
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 repair changes the original code?
- 2Which repair changes output without rewriting?
- 3Which repair may work only during one window?
Tier 1 check
Finish with the everyday model
Use the everyday picture to answer today's question in plain words: Which repair changes the original code?
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: Name the working part and cell type.
Rule 2: Separate a permanent rewrite from a temporary change in a message.
Rule 3: Require delivery, timing, safety, and unintended-effect evidence.
Where the analogy stops: Embryos and genes are not software, and biological repairs can affect many tissues.
Carry the previous idea forward
Recurrence counseling uses empiric family data and uncertainty; it gives a range, not a promise.
Today's technical takeaway
Gene editing, pathway rescue, and gene-dosage modulation are different strategies with different targets and risks.
Now map the same rules onto biology
Compare three preclinical intervention strategies
Code edit
CRISPR sequence change
Output setting
Gene-dosage modulation
Temporary patch
Timed pathway rescue
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
GEN18-E1
Animal studies have rescued some cleft-related model phenotypes through pathway or gene restoration.
Why it matters: Preclinical proof of mechanism exists.
GEN18-E2
The face forms during early, short developmental windows.
Why it matters: Delivery would need precise timing and tissue targeting.
GEN18-E3
No established prenatal gene-editing treatment prevents common human cleft lip and palate.
Why it matters: Clinical readiness is not established.
Make the clinical decision
You are evaluating a startup claim.
The company says animal rescue results mean fetal CRISPR for clefts is clinic-ready.
AReject clinic-ready language and list delivery, timing, safety, and evidence gaps.
BApprove the claim from animal rescue alone.
CSay all preclinical work is meaningless.
Choose the evaluation and cite mechanism evidence plus readiness limits.
Evidence required
GEN18-E1 + GEN18-E2 Claim ceiling
You may compare preclinical strategies. You may not claim an available or proven human prenatal treatment.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 18: Can We Fix the Code?
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
- is the chance a future child is affected given the family already has an affected child.
- For nonsyndromic, multifactorial CL/P, counselors use measured from real families (about 2.5% after one , about 4.6% after CLP), not a Punnett square.
If not, review
Today's new idea is only
Several molecular strategies correct clefting in animals, but every one is : there is no human or for CL/P, which is still managed by surgery and team care.
Goal: Describe three molecular strategies to correct or compensate for a clefting gene defect, and explain clearly that every one is with no human therapy in use.
Know by the end
- treats disease by adding, correcting, or adjusting genes or their products.
- nudges a pathway up or down without rewriting DNA; a Wnt agonist rescued Pax9-null mouse palates in utero.
- or mRNA add-back supplies the missing product; recombinant TGF-beta-3 rescued ex vivo, and irf6 mRNA restored esrp1 in zebrafish.
- Every strategy is (animal or ex vivo); a edit changes only the patient and is not inherited, while a edit changes , egg, or sperm and is inherited.
1
Three approaches, all in models
Model start: means treating disease by changing genes or their products. Three families of approaches appear in the literature, all in animals or dishes.
- -style correction would rewrite a faulty DNA letter back to normal; for CL/P this remains a ____, not a published cure.
- does not rewrite DNA at all; it nudges a pathway up or down, like the ____ agonist that rescued Pax9-null palates in utero.
- or mRNA add-back supplies the missing product, like recombinant ____ rescuing ex vivo.
2
The honest headline and the two labels
- Every genetic or molecular fix for CL/P to date is ____ (animal or ex-vivo proof of concept); human CL/P is still managed by surgery and a team.
- A ____ edit changes only the patient and is not inherited.
- A ____ edit changes , egg, or sperm and is passed to all future generations, which is why it is far more tightly restricted.
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: Several molecular strategies correct clefting in animals, but every one is : there is no human or for CL/P, which is still managed by surgery and team care.
Words to unlock first
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 · Emerging genetic treatments; molecular medicine
WebXam domain
Molecular and Genetic Technology
Evidence to produce
Write one honest paragraph for a family who read online that "gene therapy can fix cleft lip." In four to five sentences: name the most promising real strategy and its model, state plainly that it is preclinical and not available for humans, and name the central practical obstacle (the short in-utero fusion window). Do not overpromise.
Lab / skill
Medical Interventions (MI) · Biomedical Innovations (BI)
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.
- Jia et al. 2017, Wnt agonists correct cleft palates in Pax9 mutant mice in utero (Development)
- Taya et al. 1999, Pathogenesis of cleft palate in Tgfb3 knockout, ex-vivo rescue (Development)
- Kousa et al. 2017, IRF6 partial rescue in Irf6 knockout mice (Dev Dyn)
- Babai & Irving 2023, Orofacial Clefts: management of CL/P (Genes)
- Claim: State whether a molecular cure for human lip and exists today.
- Evidence: Cite one result and the model it used, for example the ____ agonist rescuing Pax9-null palates in mice.
- Reasoning: Explain the difference between worked in a ____ and available for a human patient.
How this is graded (rubric)
For: Write one honest paragraph for a family who read online that "gene therapy can fix cleft lip." In four to five sentences: name the most promising real strategy and its model, state plainly that it is preclinical and not available for humans, and name the central practical obstacle (the short in-utero fusion window). Do not overpromise.
| 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 "Write one honest paragraph for a family who read online that "gene therapy can fix cleft lip." In four to five sentences: name the most promising real strategy and its model, state plainly that it is preclinical and not available for humans, and name the central practical obstacle (the short in-utero fusion window). Do not overpromise.".
- 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: These fixes work in animals today, and the science is moving. That raises a question no experiment can answer: if correcting a gene in a human ever became possible, should we do it, and who gets to decide? We chase that next.