title: Functional analysis of Asb-1 using genetic modification in mice.
abstract: The Asbs are a family of ankyrin repeat proteins that, along with four other protein families, contain a C-terminal SOCS box motif, which was first identified in the suppressor of cytokine signaling (SOCS) proteins. While it is clear that the SOCS proteins are involved in the negative regulation of cytokine signaling, the biological roles of the other SOCS box-containing families are unknown. We have investigated Asb-1 function by generating mice that lack this protein, as well as mice that overexpress full-length or truncated Asb-1 in a wide range of tissues. Although Asb-1 is expressed in multiple organs, including the hematopoietic compartment in wild-type mice, Asb-1(-/-) mice develop normally and exhibit no anomalies of mature blood cells or their progenitors. While most organs in these mice appear normal, the testes of Asb-1(-/-) mice display a diminution of spermatogenesis with less complete filling of seminiferous tubules. In contrast, the widespread overexpression of Asb-1 in the mouse has no apparent deleterious effects.
authors.affiliation: The Walter and Eliza Hall Institute of Medical Research and The Cooperative Research Centre for Cellular Growth Factors, Royal Melbourne Hospital, Victoria 3050, Australia. kile@wehi.edu.au
authors.forename: B T
authors.initials: BT
authors.lastname: Kile
authors.forename: D
authors.initials: D
authors.lastname: Metcalf
authors.forename: S
authors.initials: S
authors.lastname: Mifsud
authors.forename: L
authors.initials: L
authors.lastname: DiRago
authors.forename: N A
authors.initials: NA
authors.lastname: Nicola
authors.forename: D J
authors.initials: DJ
authors.lastname: Hilton
authors.forename: W S
authors.initials: WS
authors.lastname: Alexander
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D000595:Amino Acid Sequence; D000818:Animals; D002352:Carrier Proteins / Q000235:genetics*; D005786:Gene Expression Regulation; D051379:Mice; D018345:Mice, Knockout; D008969:Molecular Sequence Data; D016415:Sequence Alignment; D050826:Suppressor of Cytokine Signaling Proteins
chemical_list: D048868:Adaptor Proteins, Signal Transducing; C434933:Asb1 protein, mouse; D002352:Carrier Proteins; D050826:Suppressor of Cytokine Signaling Proteins