Cited by 48Toxic Organic Pollutants ImpactLiver physiology and pathologyCardiovascular Conditions and Treatments

A Hypomorphic Allele of Aryl Hydrocarbon Receptor-Associated Protein-9 Produces a Phenocopy of the Ahr-Null Mouse

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Lin, Bernice C., Nguyen, Linh P., Walisser, Jacqueline A., Bradfield, Christopher A.·2008·Molecular Pharmacology

Abstract

The aryl hydrocarbon receptor-associated protein-9 (ARA9) is a chaperone of the aryl hydrocarbon receptor (AHR). The AHR has been shown to play a late developmental role in the normal closure of a fetal hepatovascular shunt known as the ductus venosus (DV). Given that Ara9-null mice display early embryonic lethality, we generated a hypomorphic Ara9 allele (designated Ara9(fxneo)) that displays reduced ARA9 protein expression. In an effort to demonstrate the role of ARA9 protein in AHR-mediated DV closure, we used combinations of Ara9 wild-type [Ara9(+/+)], null [Ara9(-/-)], and hypomorphic [Ara9(fxneo/fxneo)] alleles to produce mice with a graded expression of the ARA9 protein. Liver perfusion studies demonstrated that although none of the Ara9(+/+) mice displayed a patent DV, the shunt was observed in 10% of the Ara9(+/fxneo) mice, 55% of the Ara9(+/-) mice, and 83% of the Ara9(fxneo/fxneo) mice. That expression level of ARA9 correlates with the frequency of a phenocopy of the Ahr-null allele supports the conclusion that the ARA9 protein is essential for AHR signaling during development.

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Crossref · 10.1124/mol.108.047068

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  • Preliminary evidence from the authors' laboratory suggests that the NeoPGK transgene reduces RNA expression from multiple loci independent of its direction or position.

    “While extensive studies to explain how the presence of the NeoPGK cassette leads to hypomorphism are lacking, preliminary evidence from multiple alleles in our own laboratory suggest that the presence of the NeoPGK transgene reduces RNA expression from multiple loci, independent of direction or position (Bunger et al., 2008; Bunger et al., 2003; Lin et al., 2008; Walisser, Bunger, Glover, & Brad”

    From Rodent Genetic Models of Ah Receptor Signaling (2021) · cites this paper as Lin et al., 2008

    The Discussion says targeted Neo insertion frequently produces a hypomorphic allele, and the Results report markedly reduced ARA9 protein expression in mice carrying the Ara9fxneo allele (page not provided). The paper does not establish reduced RNA expression across multiple loci or show that the effect is independent of cassette direction or position. (LLM, conf=0.83)

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  • The Ara9 hypomorph (Ara9fxneo) expresses limited amounts of ARA9.

    “The ARA9 hypomorph (Ara9fxneo) is a mouse model that expresses limited amounts of the chaperone protein, Ah receptor associated 9 (ARA9) (also known as Ah Receptor interacting protein, AIP, or Hepatitis B Virus X associated protein, XAP2) (Figure 7) (LaPres et al., 2000; Lin et al., 2008).”

    From Rodent Genetic Models of Ah Receptor Signaling (2021) · cites this paper as Lin et al., 2008

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1 of the 29 references couldn’t be matched to a known paper.

Research works printed but not linked: 3

  1. Hollingshead BD Petrulis JR Perdew GH The Ah receptor transcriptional regulator XAP2 antagonizes p23 binding to Ah receptor/Hsp90 complexes and is dispensable for receptor function J Biol Chem 2004 15322122
  2. Kellendonk C Opherk C Anlag K Schutz G Tronche F Hepatocyte-specific expression of Cre recombinase Genesis 2000 26 2 151 153 10686615
  3. Lahvis G Lindell S Thomas R McCuskey R Murphy C Glover E Bentz M Southard J Bradfield C Portosystemic shunts and persistent fetal vascular structures in Ah-receptor deficient mice Proc Natl Acad Sci U S A 2000 97 10442 10447 10973493 PMC27043

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Authors
Lin, B. C., Nguyen, L. P., Walisser, J. A., & Bradfield, C. A.
Affiliations
University of Wisconsin–Madison (US)
Venue
Molecular Pharmacology
Publisher
Elsevier BV
Published
2008-11
Volume
74
Issue
5
Pages
1367-1371
ISSN
0026-895X (ISSN-L)
OpenAlex
W2131995035
Cited by
48
References
29
Citations by year
2026: 1 · 2024: 2 · 2023: 1 · 2021: 5 · 2018: 1 · 2017: 2 · 2016: 1 · 2015: 2 · 2014: 2 · 2013: 3
FWCI
6.45
Type
journal article
Language
en
Open access
Locations
  • Molecular Pharmacology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Cancer Institute (T32CA009135, P30CA014520)
  • National Institute of Environmental Health Sciences (R01ES006883)
Topics
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Toxic Organic Pollutants Impact
  • Health Sciences › Medicine › Hepatology › Liver physiology and pathology
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Cardiovascular Conditions and Treatments
Keywords
aryl hydrocarbon receptor, hypomorphic allele, AhR signaling, embryonic lethality, liver perfusion
MeSH terms
Alleles, Animals, Organ Size, Veins, Blotting, Southern, Blotting, Western, Receptors, Aryl Hydrocarbon, Mice, Knockout, Intracellular Signaling Peptides and Proteins, Mice

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