لا حاجة لخلفية في علم الأحياء
تعلّم تحرير الجينات، من الصفر
سلسلة من الأدلة القصيرة: ما هو الحمض النووي DNA، وما هو الجين، وكيف تعثر CRISPR على تسلسل وتُعدّله، ثم الأساليب المتقدمة التي جاءت بعدها. اقرأها بالترتيب أو انتقل مباشرةً إلى أي منها.
24 أدلة. كل دليل يبدأ بإجابة بلغة بسيطة، ثم يتعمق أكثر. تُستخدم التشبيهات بحرية — وكل تشبيه يرافقه توضيح لأين تتوقف دقته تمامًا، لأن التشبيه المفهوم جزئيًا هو مصدر معظم المفاهيم الخاطئة في هذا المجال.
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Start here
المفردات التي يقوم عليها كل شيء آخر.
الدليل · 4 دقيقة قراءة
What is DNA?
DNA is a long chemical chain that stores the instructions for building and running a living thing, written in an…
الدليل · 4 دقيقة قراءة
What is a gene?
A gene is a stretch of DNA that carries the instructions for making one particular thing the cell needs — usually a…
الدليل · 3 دقيقة قراءة
What is a chromosome?
A chromosome is one very long DNA molecule packaged with proteins; humans normally have 46, in 23 pairs.
الدليل · 3 دقيقة قراءة
What is a genome?
A genome is the complete set of genetic instructions in an organism — every chromosome, every gene, and everything in…
الدليل · 3 دقيقة قراءة
What is RNA?
RNA is DNA's working copy — a temporary, single-stranded version the cell makes when it needs to use a gene.
الدليل · 5 دقيقة قراءة
What is a mutation?
A mutation is a change in DNA sequence. Most do nothing, some cause disease, and a few are beneficial.
الدليل · 5 دقيقة قراءة
What is gene editing?
Gene editing is changing the DNA sequence already inside a living cell, at a chosen location.
الدليل · 6 دقيقة قراءة
What is CRISPR?
CRISPR is a bacterial immune system that scientists reprogrammed into a tool for finding and changing a chosen piece of…
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CRISPR basics
كيف يعمل النظام فعلًا، خطوةً بخطوة.
الدليل · 6 دقيقة قراءة
How CRISPR works, step by step
A guide RNA finds the target, the Cas protein cuts, and the cell's repair machinery makes the actual change.
الدليل · 4 دقيقة قراءة
What Cas proteins do
Cas proteins are the machinery of the CRISPR system: they carry the guide, search the genome, and cut what matches.
الدليل · 4 دقيقة قراءة
What guide RNA does
The guide RNA is the address. It carries a short sequence matching the target and holds the Cas protein in place.
الدليل · 5 دقيقة قراءة
How cells repair DNA — and why it decides the edit
The cell, not the editor, makes the change. Which repair pathway it uses determines what you actually get.
الدليل · 5 دقيقة قراءة
What off-target editing means
An off-target edit is a change made somewhere other than the intended site, because the guide tolerated a mismatch.
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Intermediate
ما يمكن للتعديل الجيني أن يفعله بالجين، وكيف يُوصَّل إلى جسم الإنسان.
الدليل · 5 دقيقة قراءة
Knockouts, insertions and deletions
The three basic things editing does to a gene: switch it off, take something out, or put something in.
الدليل · 6 دقيقة قراءة
Delivery: the real bottleneck
Getting the editing machinery into the right cells, in enough of them, without harm — the problem that decides which…
الدليل · 5 دقيقة قراءة
Ex vivo and in vivo editing
Ex vivo means editing cells outside the body and putting them back; in vivo means editing them where they are.
الدليل · 5 دقيقة قراءة
Viral vectors
Modified viruses used as delivery vehicles — very good at getting inside cells, which is exactly what they evolved to…
الدليل · 4 دقيقة قراءة
Lipid nanoparticles
Tiny fat bubbles that carry genetic cargo into cells — the delivery technology that made in vivo CRISPR possible.
الدليل · 4 دقيقة قراءة
Turning genes up and down
Changing how loudly a gene is expressed, without changing a single letter of its sequence.
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Advanced
الأساليب التي جاءت بعد Cas9، وإلى أين يتجه المجال.
الدليل · 4 دقيقة قراءة
Multiplex editing
Making several edits in the same cell at once — necessary for cell therapy, and riskier than making one.
الدليل · 4 دقيقة قراءة
CRISPR diagnostics
Turning CRISPR's habit of chopping up nearby nucleic acid into a fast, cheap test for a specific sequence.
الدليل · 6 دقيقة قراءة
Why gene therapies cost millions
The economics of a one-time treatment for a small population — and why the arithmetic that produces a $2.2 million…
الدليل · 5 دقيقة قراءة
How a gene-editing company works
What a pre-revenue biotechnology company actually is, and which numbers describe it — information, not investment…
الدليل · 6 دقيقة قراءة
How to read a clinical trial result
What a Phase 1 result does and does not tell you, and the questions worth asking before you believe a headline.
