Introduction
Modern molecular-biology understanding.
1. What is meant by an “unpaired gene” ⚛️
An unpaired gene usually refers to:
Loss of normal allelic balance (one functional copy + one damaged copy)
Or abnormal gene dosage (extra copies, deletions, or silencing)
This can happen due to:
Mutations
Chromosomal instability
Epigenetic silencing
Mitochondrial DNA defects
When genes are no longer properly paired or regulated, cellular homeostasis collapses.
2. DNA → mRNA → Ribosome: where failure begins š§¬
Normal flow (Central Dogma):
DNA (nucleus) → mRNA → Ribosome → Protein
In carcinoma:
DNA mutations (point mutation, deletion, insertion)
Faulty transcription → abnormal mRNA
Faulty translation → abnormal proteins
Key problems:
Oncogene activation (e.g., uncontrolled growth signals)
Tumor suppressor gene loss (e.g., p53, RB)
Stop codon failure or frame-shift errors
Ribosome produces misfolded or hyperactive proteins
Result → uncontrolled cell division
3. Intrusive gene expression & mutant inheritance š§Ŗ
Intrusive gene expression means:
Genes that should be OFF become ON
Embryonic, viral, or silent genes get reactivated
External DNA (virus, transposons) integrates into genome
Inheritance across generations:
Germline mutations (BRCA, TP53, mismatch repair genes)
Epigenetic inheritance (DNA methylation patterns)
Mitochondrial DNA mutations passed from mother
This explains:
Cancer predisposition running in families
“Upper many generations of failure” as you mention
4. Mitochondrial pathway failure š„
Mitochondria control:
ATP production
Apoptosis (programmed cell death)
Reactive oxygen species (ROS balance)
In carcinoma:
Mitochondrial DNA mutations
Faulty electron transport chain
Excess ROS → DNA damage
Failure of apoptosis → cancer cells survive
Cancer cells avoid death even when damaged.
5. Glycolysis, Krebs cycle & Warburg effect ⚙️
Normal cells:
Glucose → Pyruvate → Krebs Cycle → ATP (mitochondria)
Cancer cells:
Prefer glycolysis even with oxygen
(Warburg Effect)
This causes:
Excess lactate production
Acidic microenvironment
Rapid biomass synthesis (DNA, lipids, proteins)
Pathways involved:
Glycolysis ↑
Pyruvate diverted away from Krebs cycle
ATP generated inefficiently but rapidly
Supports uncontrolled proliferation
6. ATP, ADP, AMP imbalance ⚡
You mentioned:
Adenosine phosphate system
In cancer:
ATP demand is extremely high
AMPK signaling is altered
Energy checkpoints fail
Cells divide even under stress
This removes normal metabolic brakes.
7. Tyrosine, adenine & signaling failure š§
Tyrosine kinase pathways:
EGFR, HER2, BCR-ABL
When mutated → constant “growth ON” signal
Adenine base errors:
DNA replication mismatch
Defective repair enzymes
Accumulation of mutations
Result → genomic instability
8. Why this leads to differential carcinoma š±
Different tissues show different carcinoma because:
Each tissue has unique gene expression
Different metabolic dependence
Different mitochondrial density
Different exposure to carcinogens
Thus:
Lung carcinoma ≠ liver carcinoma ≠ breast carcinoma
Same basic failure, different manifestation
9. Unified summary ⚛️
Differential carcinoma arises from:
Unpaired or damaged genes
Abnormal DNA → mRNA → protein flow
Intrusive or inherited mutant gene expression
Mitochondrial dysfunction
Shifted metabolism (Warburg effect)
ATP signaling imbalance
Failure of apoptosis
Accumulation across generations
This creates a self-sustaining malignant system.
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