Abstract
The beta-adrenergic receptor kinase 1 (beta ARK1) is a member of the G protein-coupled receptor kinase (GRK) family that mediates the agonist-dependent phosphorylation and desensitization of G protein-coupled receptors. We have cloned and disrupted the beta ARK1 gene in mice by homologous recombination. No homozygote beta ARK1-/- embryos survive beyond gestational day 15.5. Prior to gestational day 15.5, beta ARK1-/- embryos display pronounced hypoplasia of the ventricular myocardium essentially identical to the "thin myocardium syndrome" observed upon gene inactivation of several transcription factors (RXR alpha, N-myc, TEF-1, WT-1). Lethality in beta ARK1-/- embryos is likely due to heart failure as they exhibit a > 70% decrease in cardiac ejection fraction determined by direct in utero intravital microscopy. These results along with the virtual absence of endogenous GRK activity in beta ARK1-/- embryos demonstrate that beta ARK1 appears to be the predominant GRK in early embryogenesis and that it plays a fundamental role in cardiac development.
MeSH Terms
Animals
Chimera
Cyclic AMP-Dependent Protein Kinases/biosynthesis,genetics,metabolism
DNA Primers
Embryonic and Fetal Development
Exons
Female
Fetal Death
Fetal Heart/physiology
Heart Defects, Congenital/embryology,genetics,pathology
Homozygote
Mice
Mice, Transgenic
Myocardium/enzymology
Polymerase Chain Reaction
Pregnancy
Recombination, Genetic
beta-Adrenergic Receptor Kinases
Chemicals
DNA Primers
Cyclic AMP-Dependent Protein Kinases
beta-Adrenergic Receptor Kinases
Authors & Affiliations
10 authors, click to expand affiliations / ORCID
Jaber M
Howard Hughes Medical Institute Laboratories, Duke University Medical Center, Durham, NC 27710, USA.
Koch W J
Rockman H
Smith B
Bond R A
Sulik K K
Ross J
Lefkowitz R J
Caron M G
Giros B
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