If you remember Monty Python, then you probably recall John Cleese. We’ll start with Cleese’s stem cell baloney. Not spam. Secret to eternal youth? John Cleese extols virtues of stem cell treatment, The Guardian. I’ve written before about John Cleese’s stem cell anti-aging efforts. As I told the author of The Guardian piece, I love […]
It wasn’t that long ago that Chinese scientist He Jiankui got out of jail. Why was he in there? For doing unauthorized human CRISPR to make heritably gene-edited humans. He botched that and apparently forged some approvals to make it happen. The three children involved may have life-long health problems as a result. I wrote
He Jiankui proposes editing human embryos again Read More »
Researchers have been making stem cell-based embryo models for years now and a few folks have taken to calling these “stembryos.” Other names like gastruloids and blastoids are sometimes used too. “Embryo models” might be the simplest and best name. The embryo model research has advanced relatively quickly from very basic, not very organized structures
Weekly reads: stembryos or human embryo models, new Macchiarini sentence Read More »
Stem cell biologist Jacob Hanna has a new startup called Renewal Bio. Its goal is to harvest cells or tissues from human embryo or fetus models for clinical use. I believe that their commercial ambitions have so far outstripped careful thought and discussion in the broader community of researchers. There are major risks here for
‘We don’t want to freak people out’: about that Jacob Hanna human embryo model startup Read More »
The past year was all over the place for the stem cell and regenerative medicine field. As you can see in my scoring of my 21 predictions for 2021, quite a few things were surprises in terms of what did and didn’t happen. Here’s an overview of the top stories of the year in our
Top stem cell stories of 2021: COVID, diabetes, human embryos, clinics in court Read More »
Something called the 14-day rule on growing human embryos in the lab helped keep a tough question in check for a long time: when is it ethically wrong or just practically unwise to continue growing a human embryo for research? There is no good answer based on science or anything else. ISSCR moves beyond strict
Risks rise as ISSCR drops strict 14-day rule on human embryo growth in the lab Read More »
A human embryo model is a laboratory-produced collection of living cells that has some key things in common with real human embryos. They are made from pluripotent stem cells, which include embryonic stem cells and induced pluripotent stem cells or iPS cells. This research is both exciting and ethically complicated, raising some difficult questions. Embryo
A new Cell paper from an international team led by Juan Carlos Izpisua Belmonte pushes human embryo chimera embryo research further than ever before. It is both exciting work and raises many complex bioethics questions at the same time. What is a human embryo chimera? By way of background, chimeric human embryos contain a mixture
Monkey human embryo chimera Cell paper: exciting, ethically complex direction Read More »
A new word has been added to the lexicon of human stem cell research – blastoids, aka “blastocyst-like structures.” Unlike the familiar three-layered embryo that emerges during the third week of prenatal development, the earlier blastocyst resembles a fluid-filled soccer ball, with a smear of cells on the interior face destined to develop into the
New lab-grown blastoids are strikingly similar to human embryos Read More »
Three new studies reported in preprints all show severe DNA damage to human embryos from CRISPR a surprisingly high percentage of the time including in some cases loss of heterozygosity (LOH). Anywhere from about a quarter to half of CRISPR’d embryos exhibited major genome damage. As readers of The Niche know, I never was a
CRISPR often damages human embryo chromosomes Read More »