Patent on Human Embryonic Stem Cells

The Wisconsin Alumni Research Foundation (WARF) has obtained a patent on Human Embryonic Stem Cells, USPN 7,029,913.  The validity of the patent is opposed by the Consumer Watchdog (formerly known as the Foundation for Taxpayer and Consumer Rights), a non-profit located in California with an office in D.C.  

The alleged inventor claims:

"I claim:

1. A replicating in vitro cell culture of human embryonic stem cells comprising cells which (i) are capable of proliferation in in vitro culture for over one year without the application of exogenous leukemia inhibitory factor, (ii) maintain a karyotype in which the chromosomes are euploid through prolonged culture, (iii) maintain the potential to differentiate to derivatives of endoderm, mesoderm, and ectoderm tissues throughout the culture, and (iv) are inhibited from differentiation when cultured on a fibroblast feeder layer.

2. The preparation of claim 1, wherein the stem cells will spontaneously differentiate to trophoblast and produce chorionic gonadotropin when cultured to high density.

3. The preparation of claim 1 wherein the cells are negative for the SSEA-1 marker, positive for the SSEA-4 marker, and express alkaline phosphatase."


I will report more on this later.