Subtractive cDNA cloning using oligo(dT)30-latex and PCR : isolation of cDNA clones specific to undifferentiated human embryonal carcinoma cells

• Published in: Nucleic acids research Vol. 19; no. 25; pp. 7097 - 7104
• Main Authors: HARA, E, KATO, T, NAKADA, S, SEKIYA, S, ODA, K
• Format: Journal Article
• Language: English
• Published: Oxford Oxford University Press 01.12.1991
• Subjects: Acetamides - pharmacology; Base Sequence; Biological and medical sciences; Blotting, Northern; Cell Differentiation - genetics; Cloning, Molecular - methods; Embryonal Carcinoma Stem Cells; Fundamental and applied biological sciences. Psychology; Gene Expression Regulation, Neoplastic - drug effects; Gene Library; Genes. Genome; Humans; Latex - metabolism; Molecular and cellular biology; Molecular genetics; Molecular Sequence Data; Neoplastic Stem Cells; Nucleic Acid Hybridization; Poly T - genetics; Polymerase Chain Reaction; Tumor Cells, Cultured; Human; Polymerase chain reaction; Screening; Cell line; Complementary DNA; Gene library; Method; Molecular cloning; Cell differentiation; Gene expression; Embryonal carcinoma
• DOI: 10.1093/nar/19.25.7097
• ISSN: 0305-1048

The human embryonal carcinoma cell line NEC14 can be induced to differentiate by the addition of 10(-2)M N,N'-hexamethylene-bis-acetamide (HMBA). A subtractive cDNA library specific to undifferentiated NEC14 cells was constructed using oligo(dT)30-Latex and polymerase chain reaction (PCR). The method was designed to improve the efficiency of subtraction and the enrichment of cDNA clones corresponding to low abundance mRNAs. The single strand of cDNA was made from mRNA prepared from the HMBA-treated NEC14 cells using an oligo(dT)30 primer covalently linked to Latex particles. After removal of the mRNA template by heat-denaturation and centrifugation, the subtractive hybridization was carried out between the cDNA-oligo(dT)30-Latex and mRNA from untreated NEC14 cells. Unhybridized mRNA collected by centrifugation was hybridized repeatedly to the cDNA-oligo(dT)30-Latex and subtractive mRNA was converted to cDNA. The subtractive cDNA was then amplified by PCR and cloned into pBluescript II KS-. The cDNA library thus constructed consisted of approximately 10,000 independent clones with cDNA inserts of 1.7 Kb on average. Differential hybridization of these transformants indicated that approximately 3% of them contained cDNA inserts specific to the undifferentiated EC cells, some of which were derived from low abundance mRNAs.