Educational worksheet about gene therapy for epidermolysis bullosa, also known as "butterfly children," including questions and answers.
Worksheet titled "Gene Therapy for 'Butterfly Children'" with text and questions about epidermolysis bullosa and gene therapy.
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Show Answer Key & Explanations
Step-by-step solution for: SOLUTION: article gene therapy for the butterfly children - Studypool
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Show Answer Key & Explanations
Step-by-step solution for: SOLUTION: article gene therapy for the butterfly children - Studypool
The image you've uploaded is a worksheet titled "Gene Therapy for 'Butterfly Children'", which discusses epidermolysis bullosa (EB), specifically Recessive Dystrophic Epidermolysis Bullosa (RDEB). The worksheet includes a short passage and several questions related to the disease and gene therapy approaches.
Let’s go through each question, verify the answers provided in the image, and explain them thoroughly.
---
Answer given: *Skin, epithelial tissue*
✔ Correct.
Explanation:
Epidermolysis bullosa primarily affects the skin, especially the epithelial tissue (the outermost layer of skin — the epidermis). In RDEB, the skin is extremely fragile and blisters easily due to minor friction or trauma. This condition can also affect mucous membranes (like those in the mouth, esophagus, and eyes), but the main target is the skin.
---
Answer given: *Full body bandages, antibiotics, antiseptics*
✔ Mostly correct.
Explanation:
There is no cure for RDEB currently, so treatment is supportive and palliative. Key components include:
- Daily full-body bandage changes using specialized, low-adhesion dressings to prevent further skin damage.
- Use of antibiotics to treat infections from open wounds.
- Application of antiseptics to reduce infection risk.
- Pain management, nutritional support (since eating can be painful), and sometimes surgery to address contractures.
So the answer is accurate, though it could be expanded slightly.
---
Answer given: *The build up of scar tissue*
🔶 Partially correct, but incomplete.
Better explanation:
A contracture is a condition where muscles, tendons, or joints become permanently stiff or shortened, often due to excessive scar tissue formation after repeated blistering and healing in EB. This scarring causes the skin to tighten and pull on underlying tissues, leading to restricted movement. For example, fingers may fuse together like mittens ("mitten deformities"), severely limiting mobility.
So while "build-up of scar tissue" is involved, contracture refers to the functional limitation caused by that scar tissue.
Improved answer:
*Contractures are permanent tightening of muscles, tendons, or joints due to excessive scar tissue formation, which limits movement.*
---
Answer given: *Makes skin stronger*
✔ Correct in essence, but too vague.
Better explanation:
Type VII collagen is a structural protein that forms anchoring fibrils — tiny fibers that connect the epidermis (outer skin layer) to the dermis (deeper layer). These fibrils act like "staples" or "anchors," holding the two layers together. In healthy skin, they prevent the layers from separating when stressed.
In RDEB, mutations in the COL7A1 gene disrupt Type VII collagen production, so anchoring fibrils don't form properly. This leads to blistering because the skin layers separate easily with minimal trauma.
Improved answer:
*Type VII collagen forms anchoring fibrils that connect the epidermis to the dermis, providing structural integrity and preventing blistering under stress.*
---
This section has two sub-questions:
#### a. What is the source of the modified fibroblasts?
Answer given: *The patients*
✔ Correct.
Explanation:
In gene therapy for RDEB, fibroblasts (skin cells) are taken from the patient's own body (typically from a skin biopsy). These cells are then modified in the lab to correct the faulty COL7A1 gene using a viral vector. Because the cells come from the patient, they are less likely to be rejected when reintroduced.
#### b. How is the correct gene added to the cells?
Answer given: *Through a vector*
✔ Correct.
Explanation:
A vector (often a modified virus like adenovirus or lentivirus) is used to deliver the corrected COL7A1 gene into the patient's fibroblasts. The vector acts as a delivery vehicle, inserting the functional gene into the cell’s DNA. Once corrected, these fibroblasts are grown in culture and implanted back into the patient’s skin.
---
| Question | Given Answer | Accuracy | Suggested Improvement |
|--------|--------------|---------|------------------------|
| 1 | Skin, epithelial tissue | ✔ Correct | Good |
| 2 | Full body bandages, antibiotics, antiseptics | ✔ Mostly correct | Could add: wound care, nutrition, pain management |
| 3 | The build up of scar tissue | ⚠️ Partially correct | Contractures = functional loss due to scar tissue pulling on joints/muscles |
| 4 | Makes skin stronger | ⚠️ Vague but acceptable | Better: Forms anchoring fibrils that connect epidermis to dermis |
| 5a | The patients | ✔ Correct | Good |
| 5b | Through a vector | ✔ Correct | Good |
---
- The worksheet appears to be educational, likely for high school or early college biology students.
- The concept being taught is gene therapy using autologous (patient-derived) cells and viral vectors to treat genetic skin disorders.
- This real-world application illustrates how understanding genetics and molecular biology can lead to innovative treatments.
If you'd like, I can help create a revised version of this worksheet with improved answers or turn it into a lesson plan!
Let’s go through each question, verify the answers provided in the image, and explain them thoroughly.
---
1. What part of the body is affected by epidermolysis bullosa?
Answer given: *Skin, epithelial tissue*
✔ Correct.
Explanation:
Epidermolysis bullosa primarily affects the skin, especially the epithelial tissue (the outermost layer of skin — the epidermis). In RDEB, the skin is extremely fragile and blisters easily due to minor friction or trauma. This condition can also affect mucous membranes (like those in the mouth, esophagus, and eyes), but the main target is the skin.
---
2. How is the disease currently treated?
Answer given: *Full body bandages, antibiotics, antiseptics*
✔ Mostly correct.
Explanation:
There is no cure for RDEB currently, so treatment is supportive and palliative. Key components include:
- Daily full-body bandage changes using specialized, low-adhesion dressings to prevent further skin damage.
- Use of antibiotics to treat infections from open wounds.
- Application of antiseptics to reduce infection risk.
- Pain management, nutritional support (since eating can be painful), and sometimes surgery to address contractures.
So the answer is accurate, though it could be expanded slightly.
---
3. What is a "contracture"?
Answer given: *The build up of scar tissue*
🔶 Partially correct, but incomplete.
Better explanation:
A contracture is a condition where muscles, tendons, or joints become permanently stiff or shortened, often due to excessive scar tissue formation after repeated blistering and healing in EB. This scarring causes the skin to tighten and pull on underlying tissues, leading to restricted movement. For example, fingers may fuse together like mittens ("mitten deformities"), severely limiting mobility.
So while "build-up of scar tissue" is involved, contracture refers to the functional limitation caused by that scar tissue.
Improved answer:
*Contractures are permanent tightening of muscles, tendons, or joints due to excessive scar tissue formation, which limits movement.*
---
4. Describe the role of Type VII collagen in skin?
Answer given: *Makes skin stronger*
✔ Correct in essence, but too vague.
Better explanation:
Type VII collagen is a structural protein that forms anchoring fibrils — tiny fibers that connect the epidermis (outer skin layer) to the dermis (deeper layer). These fibrils act like "staples" or "anchors," holding the two layers together. In healthy skin, they prevent the layers from separating when stressed.
In RDEB, mutations in the COL7A1 gene disrupt Type VII collagen production, so anchoring fibrils don't form properly. This leads to blistering because the skin layers separate easily with minimal trauma.
Improved answer:
*Type VII collagen forms anchoring fibrils that connect the epidermis to the dermis, providing structural integrity and preventing blistering under stress.*
---
5. Use the graphic on the next page...
This section has two sub-questions:
#### a. What is the source of the modified fibroblasts?
Answer given: *The patients*
✔ Correct.
Explanation:
In gene therapy for RDEB, fibroblasts (skin cells) are taken from the patient's own body (typically from a skin biopsy). These cells are then modified in the lab to correct the faulty COL7A1 gene using a viral vector. Because the cells come from the patient, they are less likely to be rejected when reintroduced.
#### b. How is the correct gene added to the cells?
Answer given: *Through a vector*
✔ Correct.
Explanation:
A vector (often a modified virus like adenovirus or lentivirus) is used to deliver the corrected COL7A1 gene into the patient's fibroblasts. The vector acts as a delivery vehicle, inserting the functional gene into the cell’s DNA. Once corrected, these fibroblasts are grown in culture and implanted back into the patient’s skin.
---
Summary of Answers & Corrections:
| Question | Given Answer | Accuracy | Suggested Improvement |
|--------|--------------|---------|------------------------|
| 1 | Skin, epithelial tissue | ✔ Correct | Good |
| 2 | Full body bandages, antibiotics, antiseptics | ✔ Mostly correct | Could add: wound care, nutrition, pain management |
| 3 | The build up of scar tissue | ⚠️ Partially correct | Contractures = functional loss due to scar tissue pulling on joints/muscles |
| 4 | Makes skin stronger | ⚠️ Vague but acceptable | Better: Forms anchoring fibrils that connect epidermis to dermis |
| 5a | The patients | ✔ Correct | Good |
| 5b | Through a vector | ✔ Correct | Good |
---
Final Notes:
- The worksheet appears to be educational, likely for high school or early college biology students.
- The concept being taught is gene therapy using autologous (patient-derived) cells and viral vectors to treat genetic skin disorders.
- This real-world application illustrates how understanding genetics and molecular biology can lead to innovative treatments.
If you'd like, I can help create a revised version of this worksheet with improved answers or turn it into a lesson plan!
Parent Tip: Review the logic above to help your child master the concept of gene therapy worksheet answers.
