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• W2103976947 abstract "Many G1-phase-specific mRNAs have been identified from various normal or transformed cells based on serum induction and re-entry into the cell cycle from quiescence. However, these mRNAs may not represent some important genes expressed during G1 phase in continuously cycling cells. The eukaryotic cell cycle possesses two cdk (cyclin-dependent kinase) dependent regulatory gates through which cells pass during late G1 phase and G2 phase of each cycle. Subtractive hybridization was employed to synthesize a high R 0 t fraction cDNA library enriched in sequences expressed during G1 phase prior to passage through the G1-phase gate. To prepare G1-phase cells from continuously cycling cell populations, G1-phase HeLa cells were collected by centrifugal elutriation and highly synchronous S phase cells were obtained by double thymidine block followed by centrifugal elutriation. A G1-phase subtractive cDNA library was prepared by subtracting G1-phase cDNA with a 10-fold excess of S-phase mRNA. Single-stranded, G1-phase cDNAs were isolated by oligo(dA) chromatography. The library was screened with a high R 0 t fraction subtractive probe population. Following two rounds of screening, 20 positive clones were obtained. Northern blot analysis indicated that six of these clones were enhanced in expression level during G1 phase when compared with S phase. Nucleotide sequence comparison of each clone with the GenBank data base revealed that hG1.11 was highly homologous (99%) to the apoferritin light chain gene and clones hG1.6, hG1.10, hG1.17, and hG1.18 represented new G1-phase-enriched members of four human ribosomal protein gene families (71–95% homology). The last clone, hG1.1, encoded a highly charged polypeptide not previously identified. Additional study of these G1-phase-enriched mRNAs will be required to determine their role in cell cycle progression and the G1-phase gateway through which cells transit as they proceed through the cell cycle.Key words: cell cycle, G1 phase, subtractive hybridization, cDNA cloning, ribosomal proteins, apoferritin light chain, HeLa cells." @default.
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• W2103976947 date "1993-07-01" @default.
• W2103976947 modified "2023-10-03" @default.
• W2103976947 title "Molecular cloning of G1 phase mRNAs from a subtractive G1 phase cDNA library" @default.
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• W2103976947 doi "https://doi.org/10.1139/o93-055" @default.
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