Overview

In November 2018, Chinese scientist He Jiankui shocked the world by announcing he’d created the first CRISPR-edited babies—twin girls Lulu and Nana, with edited CCR5 gene (HIV resistance). The rogue experiment violated ethical norms, lacked medical necessity, and carried unknown risks. He was imprisoned; the incident sparked global debate on germline editing limits.

The Announcement

November 26, 2018 (day before Second International Summit on Human Genome Editing): He revealed via YouTube and MIT Technology Review interview that twins born weeks earlier with edited genomes. Claimed to make them resistant to HIV (father HIV-positive) by disabling CCR5 gene (HIV entry point). The edits are heritable—passed to descendants, altering human gene pool. International scientific community expressed shock, condemnation.

Why Unethical

• No medical need: Father’s HIV manageable with drugs; IVF prevented transmission without gene editing
• Consent violations: Parents possibly misled about experimental nature, institutional review board (IRB) questionable
• Unproven safety: Off-target effects unknown, mosaic editing (some cells edited, others not) detected, CCR5 deletion increases West Nile virus/flu susceptibility
• Germline crossing: International consensus: somatic editing (non-heritable) acceptable for diseases; germline (heritable) requires extreme caution, societal consensus. He violated moratorium.
• Secrecy: No peer review, conducted in secret, announced after birth—no chance for scientific/ethical oversight

Global Backlash

• Chinese government condemned, suspended He’s work, launched investigation
• Summit organizers (Jennifer Doudna, David Baltimore) distanced from He, called for global governance
• December 2019: Chinese court sentenced He to 3 years prison, fined 3 million yuan (~$430K), lifetime research ban
• 2022: Released after 3 years; whereabouts uncertain, reportedly working in lab again

Scientists worldwide called for germline editing moratorium; most countries already banned or restricted.

The Twins’ Fate

Lulu, Nana, and third CRISPR baby (2019, not publicly announced but confirmed) identities protected. Long-term health monitoring necessary—unknown if edits cause problems decades later. Ethical concern: non-consenting minors subjected to permanent genetic alterations, lifelong surveillance, potential stigmatization (“CRISPR babies”).

Legitimate Germline Editing Debate

When is it acceptable?

• Therapeutic use: Preventing severe genetic diseases (Huntington’s, cystic fibrosis)—but somatic therapies may suffice
• Enhancement: Intelligence, athleticism, appearance—widely condemned as eugenics, inequality deepening
• “Three-parent babies”: Mitochondrial replacement therapy (UK-approved 2015) prevents mitochondrial disease—precedent for germline intervention, though different technology

Regulatory Landscape (2023)

• US: FDA prohibited germline editing implantation (funding ban)
• UK: Research allowed under strict oversight, implantation banned
• China: Tightened regulations post-He, criminal penalties
• Most countries: Banned or heavily restricted germline editing

WHO (2021) guidelines: Called for international registry of germline editing research, governance framework, but enforcement challenging.

Sources: MIT Technology Review He Jiankui investigation, Nature commentary, Second International Summit statements, Chinese court documents, CRISPR Journal ethical analyses