Congenital Hepatic Fibrosis in the Franches-Montagnes Horse Is Associated with the Polycystic Kidney and Hepatic Disease 1 (PKHD1) Gene

Drögemüller, Michaela; Jagannathan, Vidhya; Welle, Monika M.; Graubner, Claudia; Straub, Reto; Gerber, Vinzenz; Burger, Dominik; Signer-Hasler, Heidi; Poncet, Pierre-André; Klopfenstein, Stéphane; von Niederhäusern, Ruedi; Tetens, Jens; Thaller, Georg; Rieder, Stefan; Drögemüller, Cord; Leeb, Tosso; Barendse, William (2014). Congenital Hepatic Fibrosis in the Franches-Montagnes Horse Is Associated with the Polycystic Kidney and Hepatic Disease 1 (PKHD1) Gene PLoS One, 9(10), e110125. Public Library of Science (PLoS) 10.1371/journal.pone.0110125

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Congenital hepatic fibrosis has been described as a lethal disease with monogenic autosomal recessive inheritance in the Swiss Franches-Montagnes horse breed. We performed a genome-wide association study with 5 cases and 12 controls and detected an association on chromosome 20. Subsequent homozygosity mapping defined a critical interval of 952 kb harboring 10 annotated genes and loci including the polycystic kidney and hepatic disease 1 (autosomal recessive) gene (PKHD1). PKHD1 represents an excellent functional candidate as variants in this gene were identified in human patients with autosomal recessive polycystic kidney and hepatic disease (ARPKD) as well as several mouse and rat mutants. Whereas most pathogenic PKHD1 variants lead to polycystic defects in kidney and liver, a small subset of the human ARPKD patients have only liver symptoms, similar to our horses with congenital hepatic fibrosis. The PKHD1 gene is one of the largest genes in the genome with multiple alternative transcripts that have not yet been fully characterized. We sequenced the genomes of an affected foal and 46 control horses to establish a comprehensive list of variants in the critical interval. We identified two missense variants in the PKHD1 gene which were strongly, but not perfectly associated with congenital hepatic fibrosis. We speculate that reduced penetrance and/or potential epistatic interactions with hypothetical modifier genes may explain the imperfect association of the detected PKHD1 variants. Our data thus indicate that horses with congenital hepatic fibrosis represent an interesting large animal model for the liver-restricted subtype of human ARPKD.

Item Type:	Journal Article (Original Article)
Division/Institute:	School of Agricultural, Forest and Food Sciences HAFL > Resource-efficient agricultural production systems School of Agricultural, Forest and Food Sciences HAFL > Agriculture
Name:	Drögemüller, Michaela; Jagannathan, Vidhya; Welle, Monika M.; Graubner, Claudia; Straub, Reto; Gerber, Vinzenz; Burger, Dominik; Signer-Hasler, Heidi0000-0001-5193-5306; Poncet, Pierre-André; Klopfenstein, Stéphane; von Niederhäusern, Ruedi; Tetens, Jens; Thaller, Georg; Rieder, Stefan; Drögemüller, Cord; Leeb, Tosso and Barendse, William
Subjects:	S Agriculture > SF Animal culture
ISSN:	1932-6203
Publisher:	Public Library of Science (PLoS)
Language:	English
Submitter:	David Zimmer
Date Deposited:	04 Oct 2019 12:18
Last Modified:	03 Nov 2023 09:56
Publisher DOI:	10.1371/journal.pone.0110125
ARBOR DOI:	10.24451/arbor.8246
URI:	https://arbor.bfh.ch/id/eprint/8246