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Microbiology and Molecular Biology Reviews, September 2002, p. 407-425, Vol. 66, No. 3
1092-2172/02/$04.00+0     DOI: 10.1128/MMBR.66.3.407-425.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Human Telomerase and Its Regulation

Yu-Sheng Cong,* Woodring E. Wright, and Jerry W. Shay

Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9039

The telomere is a special functional complex at the end of linear eukaryotic chromosomes, consisting of tandem repeat DNA sequences and associated proteins. It is essential for maintaining the integrity and stability of linear eukaryotic genomes. Telomere length regulation and maintenance contribute to normal human cellular aging and human diseases. The synthesis of telomeres is mainly achieved by the cellular reverse transcriptase telomerase, an RNA-dependent DNA polymerase that adds telomeric DNA to telomeres. Expression of telomerase is usually required for cell immortalization and long-term tumor growth. In humans, telomerase activity is tightly regulated during development and oncogenesis. The modulation of telomerase activity may therefore have important implications in antiaging and anticancer therapy. This review describes the currently known components of the telomerase complex and attempts to provide an update on the molecular mechanisms of human telomerase regulation.

* Corresponding authors. Mailing address: Department of Cell Biology, UT Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX 75390-9039. Phone: (214) 648-3282. Fax: (214) 648-8694. E-mail: Jerry.Shay{at}UTSouthwestern.edu; Yu-Sheng.Cong{at}UTSouthwestern.edu; Woodring.Wright{at}UTSouthwestern.edu.

Microbiology and Molecular Biology Reviews, September 2002, p. 407-425, Vol. 66, No. 3
1092-2172/02/$04.00+0     DOI: 10.1128/MMBR.66.3.407-425.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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