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J Biol Chem. 2017 May 12;292(19):7904-7920. doi: 10.1074/jbc.M116.772038. Epub 2017 Mar 16.

Ankyrin repeat and zinc-finger domain-containing 1 mutations are associated with infantile-onset inflammatory bowel disease.

Author information

1
From the Division of Pediatrics, Wilhelmina Children's Hospital.
2
the Regenerative Medicine Center and Center for Molecular Medicine, and.
3
the Department of Medical Genetics, Center for Molecular Medicine, University Medical Center Utrecht, 3584 CT Utrecht, The Netherlands.
4
the Division of Gastroenterology, Hepatology, and Nutrition, Department of Pediatrics, University of Toronto, Hospital for Sick Children, Toronto, Ontario M5G 1X8, Canada.
5
the SickKids Inflammatory Bowel Disease Center and Cell Biology Program, Research Institute, Hospital for Sick Children, Toronto, Ontario M5G 1X8, Canada, and.
6
the Hubrecht Institute, KNAW and University Medical Center Utrecht, 3584 CT Utrecht, The Netherlands.
7
From the Division of Pediatrics, Wilhelmina Children's Hospital, p.j.coffer@umcutrecht.nl.

Abstract

Infantile-onset inflammatory bowel disease (IO IBD) is an invalidating illness with an onset before 2 years of age and has a complex pathophysiology in which genetic factors are important. Homozygosity mapping and whole-exome sequencing in an IO IBD patient and subsequent sequencing of the candidate gene in 12 additional IO IBD patients revealed two patients with two mutated ankyrin repeat and zinc-finger domain-containing 1 (ANKZF1) alleles (homozygous ANKZF1 R585Q mutation and compound heterozygous ANKZF1 E152K and V32_Q87del mutations, respectively) and two patients with one mutated ANKZF1 allele. Although the function of ANKZF1 in mammals had not been previously evaluated, we show that ANKZF1 has an indispensable role in the mitochondrial response to cellular stress. ANKZF1 is located diffusely in the cytoplasm and translocates to the mitochondria upon cellular stress. ANKZF1 depletion reduces mitochondrial integrity and mitochondrial respiration under conditions of cellular stress. The ANKZF1 mutations identified in IO IBD patients with two mutated ANKZF1 alleles result in dysfunctional ANKZF1, as shown by an increased level of apoptosis in patients' lymphocytes, a decrease in mitochondrial respiration in patient fibroblasts with a homozygous ANKZF1 R585Q mutation, and an inability of ANKZF1 R585Q and E152K to rescue the phenotype of yeast deficient in Vms1, the yeast homologue of ANKZF1. These data indicate that loss-of-function mutations in ANKZF1 result in deregulation of mitochondrial integrity, and this may play a pathogenic role in the development of IO IBD.

KEYWORDS:

ANKZF1; apoptosis; cell biology; human genetics; infantile-onset inflammatory bowel disease; inflammatory bowel disease (IBD); mitochondria; mitochondrial stress; whole-exome sequencing

PMID:
28302725
PMCID:
PMC5427269
DOI:
10.1074/jbc.M116.772038
[Indexed for MEDLINE]
Free PMC Article

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