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Chapter 2 - Background

🧬 Timeline of Artificial / Synthetic Life Creation

🔹 1953 – Miller-Urey Experiment

What happened: Simulated early Earth conditions in a flask, producing amino acids from simple gases and electrical sparks.

Importance: First experimental evidence that organic molecules could form from inorganic matter.

🔹 2000s – Rise of Modern Synthetic Biology

Tools like gene editing (e.g., CRISPR), DNA synthesis, and bioinformatics made it possible to design and build DNA sequences from scratch.

🔹 2010 – Mycoplasma mycoides JCVI-syn1.0 (Craig Venter Institute)

What happened: Researchers synthesized a complete bacterial genome (~1 million base pairs), inserted it into a recipient cell (with its own DNA removed), and it began replicating.

🧠 The first "synthetic cell", although the cell membrane and machinery came from a natural bacterium.

🔹 2016 – JCVI-syn3.0: Minimal Life

What happened: Built a bacterial genome with only 473 essential genes — the fewest ever for a self-replicating organism.

Goal: To understand the minimal requirements for life.

⚠️ Still not life "from scratch" — used a natural cell chassis.

🔹 2019 – Functional Protocells

Labs (MIT, Max Planck, etc.) created artificial compartments (liposomes, polymers, coacervates) that could perform limited genetic functions, like protein expression or partial DNA replication.

🔹 2020 – Xenobots

What they are: Tiny living robots built from Xenopus laevis frog cells. They can move, self-heal, and transport objects.

⚙️ Designed using evolutionary algorithms, assembled manually.

❗ Not synthetic life from scratch — they're repurposed biological systems.

🔹 2021 – Synthetic Cells with Programmable Functions

Researchers created artificial vesicles capable of specific biological functions — such as protein synthesis, gene circuit activation, and stimulus response.

Some function as basic models of living behavior.

🔹 2023–2025 – Toward Autonomous Protocells

Teams from EMBL, Harvard, and others made strides in building bottom-up protocells capable of metabolism, gene expression, and compartmentalization using non-living components.

However, fully autonomous replication and evolution are not yet achieved.

🧠 What Counts as "Life" in This Context?

Life Criterion

Achieved Artificially?

Metabolism

Partially (in vitro systems)

Replication

Not fully autonomous

Evolution

Not yet

Compartmentalization

Yes

Environmental Response

Yes, in limited systems

📌 Summary

We cannot yet create fully living cells from inert matter alone.

But researchers have:

Synthesized genomes

Created programmable protocells

Built multicellular bio-robots from natural cells

We are getting closer to designing fully synthetic, autonomous life — but key hurdles remain, especially replication and evolution.

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