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Complex Structure and Regulation of the P16 (MTS1) Locus

Myriad Genetics, Inc., Salt Lake City, Utah 84018 [S. S., P. J., P. D., S. V. T., H. K., A. K.], and Imperial Cancer Research Fund Laboratories, 44 Lincoln's Inn Fields, London, WC2A 3PX, United Kingdom [D. P., G. P.]

The p16 gene (P16, MTS1, CDKN2) encodes a negative regulator of the cell cycle. Molecular genetic techniques have been used to explore the role of p16 in normal development and cancer. Two transcripts derived from the p16 gene with distinct protein coding potentials are described. The previously undescribed transcript form has the same exons 2 and 3 as the p16-encoding mRNA but contains a different exon 1. The human p16 transcripts are detected in various tissues, and the ratio of the transcripts is regulated in both a tissue-specific and cell cycle-specific manner. The P16-derived mRNAs are probably generated from separate promoters, and transcription from one of the promoters appears to be regulated, at least in part, by the retinoblastoma gene product.

¹ To whom requests for reprints should be addressed, at Myriad Genetics, Inc., 390 Wakara Way, Salt Lake City, UT 84018.

Received 3/28/95. Accepted 6/ 2/95.

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