title: Shared role of the pRB-related p130 and p107 proteins in limb development.
abstract: The p130 protein shares extensive sequence similarity with pRB, the product of the retinoblastoma gene, and is a major E2F-associated protein in quiescent cells. To investigate its biological function, we have mutated p130 via gene targeting in the mouse. Homozygous mutation of p130 had little discernible effect on development or on the growth of mouse embryo fibroblasts in culture. Much of the E2F activity that normally associates with p130 in serum-starved mouse embryo fibroblasts associated instead with the highly related p107 protein. To determine whether p130 and p107 have overlapping biological roles, we produced mice having simultaneous inactivation of the p130 and p107 genes. Such mice exhibited deregulated chondrocyte growth, defective endochondral bone development, shortened limbs, and neonatal lethality. These findings indicate that p130 and p107 play an important role in limb development through their abilities to control chondrocyte proliferation. Thus, in certain settings p107 and p130 perform growth-regulatory functions that are not fulfilled by pRB.
authors.affiliation: Whitehead Institute for Biomedical Research, Cambridge, Massachusetts 02142, USA.
authors.forename: D
authors.initials: D
authors.lastname: Cobrinik
authors.forename: M H
authors.initials: MH
authors.lastname: Lee
authors.forename: G
authors.initials: G
authors.lastname: Hannon
authors.forename: G
authors.initials: G
authors.lastname: Mulligan
authors.forename: R T
authors.initials: RT
authors.lastname: Bronson
authors.forename: N
authors.initials: N
authors.lastname: Dyson
authors.forename: E
authors.initials: E
authors.lastname: Harlow
authors.forename: D
authors.initials: D
authors.lastname: Beach
authors.forename: R A
authors.initials: RA
authors.lastname: Weinberg
authors.forename: T
authors.initials: T
authors.lastname: Jacks
mesh_terms: D000818:Animals; D001483:Base Sequence; D001835:Body Weight; D001846:Bone Development; D002352:Carrier Proteins; D002356:Cartilage / Q000166:cytology / Q000196:embryology; D002453:Cell Cycle; D018797:Cell Cycle Proteins; D002455:Cell Division; D002478:Cells, Cultured; D003433:Crosses, Genetic; D004268:DNA-Binding Proteins; D050684:E2F Transcription Factors; D005121:Extremities / Q000196:embryology*; D005347:Fibroblasts; D018390:Gene Targeting; D016161:Genes, Retinoblastoma / Q000235:genetics; D006132:Growth Plate / Q000196:embryology; D006720:Homozygote; D051379:Mice; D008810:Mice, Inbred C57BL; D008817:Mice, Mutant Strains; D008969:Molecular Sequence Data; D009687:Nuclear Proteins / Q000235:genetics / Q000502:physiology*; D010750:Phosphoproteins / Q000235:genetics / Q000502:physiology*; D011506:Proteins; D012333:RNA, Messenger / Q000032:analysis; D056465:Retinoblastoma-Binding Protein 1; D050720:Retinoblastoma-Like Protein p107; D050717:Retinoblastoma-Like Protein p130; D050680:Transcription Factor DP1; D014157:Transcription Factors / Q000378:metabolism
chemical_list: C533431:Arid4a protein, mouse; D002352:Carrier Proteins; D018797:Cell Cycle Proteins; D004268:DNA-Binding Proteins; D050684:E2F Transcription Factors; D009687:Nuclear Proteins; D010750:Phosphoproteins; D011506:Proteins; D012333:RNA, Messenger; C489485:Rbl1 protein, mouse; C493838:Rbl2 protein, mouse; D056465:Retinoblastoma-Binding Protein 1; D050720:Retinoblastoma-Like Protein p107; D050717:Retinoblastoma-Like Protein p130; D050680:Transcription Factor DP1; D014157:Transcription Factors