Adult pancreatic β-cells are formed by self-duplication rather than stem-cell differentiation

Yuval Dor, Juliana Brown, Olga I. Martinez, Douglas A. Melton*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1964 Scopus citations


How tissues generate and maintain the correct number of cells is a fundamental problem in biology. In principle, tissue turnover can occur by the differentiation of stem cells, as is well documentad for blood, skin and intestine, or by the duplication of existing differentiated cells. Recent work on adult stem cells has highlighted their potential contribution to organ maintenance and repair. However, the extent to which stem cells actually participate in these processes in vivo is not clear. Here we introduce a method for genetic lineage tracing to determine the contribution of stem cells to a tissue of interest. We focus on pancreatic β-cells, whose postnatal origins remain controversial. Our analysis shows that pro-existing β-cells, rather than pluripotent stem cells, are the major source of new β-cells during adult life and after pancreatectomy in mice. These results suggest that terminally differentiated β-cells retain a significant proliferative capacity in vivo and cast doubt on the idea that adult stem cells have a significant role in β-cell replenishment.

Original languageAmerican English
Pages (from-to)41-46
Number of pages6
Issue number6987
StatePublished - 6 May 2004
Externally publishedYes

Bibliographical note

Funding Information:
Acknowledgements We thank J. Dubauskaite for zygote injection, G. Kenty for help with fluorescence-activated cell sorting analysis, H. Hsieh for technical assistance, and S. Bonner-Weir, A. Regev and members of the Melton laboratory for discussions. D.A.M. is a Howard Hughes Medical Institute Investigator. Y.D. was supported by EMBO and JDRF postdoctoral fellowships.


Dive into the research topics of 'Adult pancreatic β-cells are formed by self-duplication rather than stem-cell differentiation'. Together they form a unique fingerprint.

Cite this