Mouse Model of Alagille Syndrome and Mechanisms of Jagged1 Missense Mutations

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F18%3A00113255" target="_blank" >RIV/00216224:14310/18:00113255 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0016508517363369" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0016508517363369</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1053/j.gastro.2017.11.002" target="_blank" >10.1053/j.gastro.2017.11.002</a>

Result language

angličtina

Original language name

Mouse Model of Alagille Syndrome and Mechanisms of Jagged1 Missense Mutations

Original language description

BACKGROUND &amp; AIMS: Alagille syndrome is a genetic disorder characterized by cholestasis, ocular abnormalities, characteristic facial features, heart defects, and vertebral malformations. Most cases are associated with mutations in JAGGED1 (JAG1), which encodes a Notch ligand, although it is not clear how these contribute to disease development. We aimed to develop a mouse model of Alagille syndrome to elucidate these mechanisms. METHODS: Mice with a missense mutation (H268Q) in Jag1 (Jag1(+/Ndr) mice) were outbred to a C3H/C57bl6 background to generate a mouse model for Alagille syndrome (Jag1(Ndr/Ndr) mice). Liver tissues were collected at different timepoints during development, analyzed by histology, and liver organoids were cultured and analyzed. We performed transcriptome analysis of Jag1(Ndr/Ndr) livers and livers from patients with Alagille syndrome, cross-referenced to the Human Protein Atlas, to identify commonly dysregulated pathways and biliary markers. We used species-specific transcriptome separation and ligand-receptor interaction assays to measure Notch signaling and the ability of JAG1(Ndr) to bind or activate Notch receptors. We studied signaling of JAG1 and JAG1(Ndr) via NOTCH 1, NOTCH2, and NOTCH3 and resulting gene expression patterns in parental and NOTCH1-expressing C2C12 cell lines. RESULTS: Jag1(Ndr/Ndr) mice had many features of Alagille syndrome, including eye, heart, and liver defects. Bile duct differentiation, morphogenesis, and function were dysregulated in newborn Jag1(Ndr/Ndr) mice, with aberrations in cholangiocyte polarity, but these defects improved in adult mice. Jag1(Ndr/Ndr) liver organoids collapsed in culture, indicating structural instability. Whole-transcriptome sequence analyses of liver tissues from mice and patients with Alagille syndrome identified dysregulated genes encoding proteins enriched at the apical side of cholangiocytes,including CFTR and SLC5A1, as well as reduced expression of IGF1. Exposure of Notch-expressing cells to JAG1(Ndr), compared with JAG1, led to hypomorphic Notch signaling, based on transcriptome analysis. JAG1-expressing cells, but not JAG1(Ndr)-expressing cells, bound soluble Notch1 extracellular domain, quantified by flow cytometry. However, JAG1 and JAG1(Ndr) cells each bound NOTCH2, and signaling from NOTCH2 signaling was reduced but not completely inhibited, in response to JAG1(Ndr) compared with JAG1. CONCLUSIONS: In mice, expression of a missense mutant of Jag1 (Jag1(Ndr)) disrupts bile duct development and recapitulates Alagille syndrome phenotypes in heart, eye, and craniofacial dysmorphology. JAG1(Ndr) does not bind NOTCH1, but binds NOTCH2, and elicits hypomorphic signaling. This mouse model can be used to study other features of Alagille syndrome and organ development.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

30219 - Gastroenterology and hepatology

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Gastroenterology

ISSN

0016-5085

e-ISSN

1528-0012

Volume of the periodical

154

Issue of the periodical within the volume

4

Country of publishing house

US - UNITED STATES

Number of pages

16

Pages from-to

1080-1095

UT code for WoS article

000427453300047

EID of the result in the Scopus database

2-s2.0-85043237736