title: Expression of replication factor C 40-kDa subunit is down-regulated during neonatal development in rat ventricular myocardium.
abstract: During neonatal development, cardiac myocytes undergo a transition from hyperplastic to hypertrophic growth. Whether these cells are terminally differentiated and permanently withdrawn from the cell cycle shortly after birth is controversial. Nevertheless, the clinical observation that functionally significant myocardial regeneration has not been documented in cardiovascular disease or injury during adulthood seems to support the notion that the vast majority of cardiac myocytes do not proliferate once they differentiate. Regardless of the controversy, the elucidation on how mitosis is blocked in cardiac myocytes may facilitate development of new cardiovascular therapies, based on the regeneration of the adult myocardium. To better understand postnatal myocardial development, we performed suppression subtractive hybridization to isolate genes that are differentially expressed in day one or day seven postnatal rat ventricular myocardium. Here we report the down-regulated mRNA expression of the 40-kDa subunit of replication factor C (RFC p40 or RFC2), which is an essential processive factor for proliferating cellular nuclear antigen-dependent DNA replication during neonatal myocardial development.
authors.affiliation: Department of Biochemistry, The Chinese University of Hong Kong, Shatin, NT, Hong Kong, China.
authors.forename: S S
authors.initials: SS
authors.lastname: Chim
authors.forename: K
authors.initials: K
authors.lastname: Fung
authors.forename: M M
authors.initials: MM
authors.lastname: Waye
authors.forename: C
authors.initials: C
authors.lastname: Lee
authors.forename: S K
authors.initials: SK
authors.lastname: Tsui
mesh_terms: D000367:Age Factors; D000595:Amino Acid Sequence; D000818:Animals; D000831:Animals, Newborn; D001483:Base Sequence; D015152:Blotting, Northern; D018076:DNA, Complementary / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000096:biosynthesis*; D015536:Down-Regulation; D018507:Gene Expression Regulation, Developmental; D015723:Gene Library; D006352:Heart Ventricles / Q000254:growth & development* / Q000378:metabolism; D018398:Homeodomain Proteins; D006801:Humans; D051379:Mice; D015778:Minor Histocompatibility Antigens; D008969:Molecular Sequence Data; D009693:Nucleic Acid Hybridization; D011061:Poly A / Q000378:metabolism; D019253:Proto-Oncogene Proteins c-bcl-2; D012333:RNA, Messenger / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D051818:Replication Protein C; D012097:Repressor Proteins; D029701:Saccharomyces cerevisiae Proteins; D017386:Sequence Homology, Amino Acid; D012689:Sequence Homology, Nucleic Acid
chemical_list: C096816:BCL2-related protein A1; D018076:DNA, Complementary; D004268:DNA-Binding Proteins; D018398:Homeodomain Proteins; C096063:MATA1 protein, S cerevisiae; D015778:Minor Histocompatibility Antigens; D019253:Proto-Oncogene Proteins c-bcl-2; C497561:RFC2 protein, human; D012333:RNA, Messenger; D012097:Repressor Proteins; C497566:Rfc2 protein, mouse; D029701:Saccharomyces cerevisiae Proteins; D011061:Poly A; D051818:Replication Protein C