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MODULE 4:
MAKING CELLS AND PROTEINS
PART 7 OF 7
She remembers the call that delivered the diagnosis — the strange double feeling of relief and grief. A name, finally, and beneath it the quiet arithmetic of all the years it had taken to get one.
Slide 1 Transcript
PATIENT CHART
STINA
Grad student · recurrent fevers, pain & swelling since childhood
THIS PART
Age 26 · ER
PRESENTING WITH
RLQ pain + fever
ACTION TAKEN
Appendectomy
PATHOLOGY
Normal
CHART CLUES
COLLECTED AS YOU GO
A Full Family & Ancestry History
A Germline (Constitutional) Variant
An Actively Expressed Disease
MEFV M694V — a Missense Point Mutation
It’s the Sequence, Not Damage
A Single Multisystem Disorder
MEFV Gene Panel
Put your money down: After twenty years, what finally turned the chart into a name?
Bet before the reveal. For a lifetime Stina got shrugs and maybes; the signsObjective clinical findings observable by a provider (e.g., edema, fever). sat scattered across twenty years of records. Two quick fact-checks on how the gene passes on and assembles into the disease; then the ask: was her diagnosis impossible to make sooner — or was it always within reach, needing only one clinician to read the whole chart at once?
Pick the answer you believe now. We’ll come back to it later!
The Call That Brought Relief and Grief
Stina remembers exactly where she was standing when the call came with the result. What surprised her was the doubleness of it — relief and grief arriving in the very same breath. Relief, because there was finally a name, a real and specific answer after a lifetime of shrugs and maybes. Grief, because beneath that name lay a quiet, brutal arithmetic: all the years it had taken to get here, all the attacks dismissed, all the decades she might have spent being treated instead of doubted. A diagnosis that arrives this late is never only good news. It is an answer and a reckoning at once, handed over in the same sentence.
The MEFV Gene
One gene, one address, one changed letter — MEFV on chromosome 16, coding for pyrin.
Slide 2 Transcript
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Multiple Choice: Where does the MEFV gene sit, and what does it code for?
Copying the Mistake Forward
Transcription and translationThe process of converting mRNA into a protein. relay the typo — codon 694 reads valine for methionine, M694V.
Slide 3 Transcript
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Flip Cards: Flip to check how the typo survives the whole central dogma.
Misfolded Pyrin → IL-1β
A broken brake on inflammation — misfolded pyrin can’t restrain the inflammasome, so IL-1β floods out.
Slide 4 Transcript
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Summary: Pick the true statement about misfolded pyrin and IL-1β.
The Whole Dogma, Behind One Answer
Put the whole central dogma together and the reveal is complete: MEFV → mRNA → misfolded pyrin → an unrestrained inflammasome → a flood of IL-1β. The mutationA change in DNA sequence that can affect gene function. began in the zygote, and mitosis carried it into every cell of her body. Because FMF is autosomal recessive, two unaffected carrier parents and a quiet family history — plus a lazy assumption that her Swedish ancestry made the disease unlikely — hid it for decades behind a screen of false reassurance.
Inherited vs Acquired
Born-with pyrin vs accumulated amyloid — one present from the first cell, one built up over years.
Slide 5 Transcript
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Single Choice: What separates inherited misfolding (pyrin) from acquired aggregation (amyloid)?
Begins in the Zygote
The error was there from the very first cell — inherited from both parents, not caught, caused, or avoidable.
Slide 6 Transcript
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Drag the Words: Drop the facts about where and when the typo began.
Mitosis Carries It Everywhere
One cell’s error, copied into all of them — every daughter cell, then differentiation hands out jobs.
Slide 6 Transcript
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Fill in the Blanks: Fill in how one typo reaches every cell in the body.
The Reader Who Saw It as One Story
Then one clinician recognized the periodic-fever pattern for what it was, connected it to Chart Clues #1, #2, and #3, and ordered the MEFV gene panel — which confirmed familial Mediterranean fever. This is Chart Clue #4 — the Chart Reveal the whole course has been building toward: the signs had been present the entire time, scattered across twenty years of records, waiting for a single reader willing to see them as one story instead of many. The Making Cells and Proteins module followed one typo from a gene to a diagnosis. The harder truth it leaves behind is that the diagnosis was always possible — it only ever needed someone to read the whole chart at once.
Autosomal-Recessive Inheritance
Two copies needed, and quiet carriersMembrane proteins that transport substances across a cell membrane. — one mutated copy is an unaffected carrier; two carriers, 1-in-4 odds.
Slide 6 Transcript
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Mark the Words: Mark the true statements about autosomal-recessive inheritance.
The Ancestry Assumption
Probabilities mistaken for rules — ‘Swedish, so not FMF’ and ‘too rare to be real’ hid it for years.
Slide 6 Transcript
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Multiple Choice: Why did the ancestry assumption help delay Stina’s diagnosis?
FINDING!
MEFV Gene Panel Confirms Familial Mediterranean Fever
Put the whole chain together — MEFV → mRNA → misfolded pyrin → unrestrained inflammasome → IL-1β — and the reveal is complete. A clinician recognized the periodic-fever pattern, connected Chart Clues #1, #2, and #3, and ordered the MEFV gene panel, which confirmed familial Mediterranean fever (autosomal recessive; two carrier parents, with ancestry bias and rarity having hidden it for decades).
Confirm or refute your bet: After twenty years, what finally turned the chart into a name?
Now put the whole dogma together: MEFV → mRNA → misfolded pyrin → unrestrained inflammasome → IL-1β, a mutation that began in the zygote and rode mitosis into every cell. Because FMF is autosomal recessive, two quiet carrier parents and an ancestry assumption hid it for decades. Then one clinician connected Chart Clues #1–3 and ordered the MEFV panel.
Slide 7 Transcript
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← Familial Mediterranean Fever — case home
All pages for Module 4 — Making Cells & Proteins
4.0 Module Overview
4.1 The First Doctor Who Asked
4.2 Copying the Code
4.3 Written in Me the Whole Time
4.4 One Letter — Translation and M694V
4.5 It Was in Me Before I Was Born — The Cell Cycle
4.6 One Typo, Every Cell
4.7 The Reveal – From MEFV to Diagnosis
4.8 Conclusion and Assessment
4.9 Evidence Behind the Case
All Modules
- Anatomical Language, Membranes & Homeostasis
- Just Enough Chemistry
- The Cell & Its Transport
- Making Cells & Proteins
- The Integumentary System
- The Skeletal System
- The Muscular System
- Nervous Tissue & the Senses
- The Spinal Cord
- The Brain & the Blood–Brain Barrier
- The Autonomic Nervous System
- Special Senses (in developmentThe process of growth and differentiation.)
- The Endocrine System
- Blood
- The Heart
- Blood Vessels
- The Digestive System
- The Respiratory System
- The Urinary System
- Fluids, Electrolytes & Acid–Base Balance
- The Reproductive System
- The Immune System
List of terms
- signs
- translation
- mutation
- carriers
- development