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Molecular and Cellular Biology, December 2001, p. 8651-8656, Vol. 21, No. 24
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.24.8651-8656.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Requirement for Yeast RAD26, a Homolog of the Human CSB Gene, in Elongation by RNA Polymerase II

Sung-Keun Lee, Sung-Lim Yu, Louise Prakash, and Satya Prakash*

Sealy Center for Molecular Science, University of Texas Medical Branch, Galveston, Texas 77555-1061

Received 21 August 2001/Returned for modification 12 September 2001/Accepted 19 September 2001

Mutations in the human CSB gene cause Cockayne syndrome (CS). In addition to increased photosensitivity, CS patients suffer from severe developmental abnormalities, including growth retardation and mental retardation. Whereas a deficiency in the preferential repair of UV lesions from the transcribed strand accounts for the increased photosensitivity of CS patients, the reason for developmental defects in these individuals has remained unclear. Here we provide in vivo evidence for a role of RAD26, the counterpart of the CSB gene in Saccharomyces cerevisiae, in transcription elongation by RNA polymerase II, and in addition we show that under conditions requiring rapid synthesis of new mRNAs, growth is considerably reduced in cells lacking RAD26. These findings implicate a role for CSB in transcription elongation, and they strongly suggest that impaired transcription elongation is the underlying cause of the developmental problems in CS patients.

* Corresponding author. Mailing address: Sealy Center for Molecular Science, University of Texas Medical Branch, 6.104 Blocker Medical Research Building, 11th and Mechanic Streets, Galveston, TX 77555-1061. Phone: (409) 747-8602. Fax: (409) 747-8608. E-mail: sprakash{at}scms.utmb.edu.

Molecular and Cellular Biology, December 2001, p. 8651-8656, Vol. 21, No. 24
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.24.8651-8656.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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