The University of Southampton
University of Southampton Institutional Repository

De novo and rare mutations in the HSPA1L heat shock gene associated with inflammatory bowel disease

De novo and rare mutations in the HSPA1L heat shock gene associated with inflammatory bowel disease
De novo and rare mutations in the HSPA1L heat shock gene associated with inflammatory bowel disease
Background: Inflammatory bowel disease (IBD) is a chronic, relapsing inflammatory disease of the gastrointestinal tract which includes ulcerative colitis and Crohn's disease. Genetic risk factors for IBD are not well understood.

Methods: We performed a family-based whole exome sequencing (WES) analysis on a core family (Family A) to identify potential causal mutations and then analyzed exome data from a Caucasian pediatric cohort (136 patients and 106 controls) to validate the presence of mutations in the candidate gene, heat shock 70 kDa protein 1-like (HSPA1L). Biochemical assays of the de novo and rare (minor allele frequency, MAF < 0.01) mutation variant proteins further validated the predicted deleterious effects of the identified alleles.

Results: In the proband of Family A, we found a heterozygous de novo mutation (c.830C > T; p.Ser277Leu) in HSPA1L. Through analysis of WES data of 136 patients, we identified five additional rare HSPA1L mutations (p.Gly77Ser, p.Leu172del, p.Thr267Ile, p.Ala268Thr, p.Glu558Asp) in six patients. In contrast, rare HSPA1L mutations were not observed in controls, and were significantly enriched in patients (P = 0.02). Interestingly, we did not find non-synonymous rare mutations in the HSP70 isoforms HSPA1A and HSPA1B. Biochemical assays revealed that all six rare HSPA1L variant proteins showed decreased chaperone activity in vitro. Moreover, three variants demonstrated dominant negative effects on HSPA1L and HSPA1A protein activity.

Conclusions: Our results indicate that de novo and rare mutations in HSPA1L are associated with IBD and provide insights into the pathogenesis of IBD, and also expand our understanding of the roles of HSP70s in human disease.
1-11
Takahashi, Shinichi
8f48ee18-0ffb-41d2-9ac6-5b14ca39b716
Andreoletti, Gaia
75cfc74e-f938-48c8-b3d5-5b377297d008
Chen, Rui
941fa635-535a-425b-86bb-3ef9476bb571
Munehira, Yoichi
6fccae4d-5b87-4c99-b189-8d4bb1325dc6
Batra, Akshay
822f891e-87ca-41d9-b68d-27c395e88809
Afzal, Nadeem A.
5148f35e-6788-4dbd-a50f-c303a4948d60
Beattie, R Mark
609ef780-5092-45be-9cca-7d8fe7eb4fd0
Bernstein, Jonathan A.
6ec42319-d124-4ded-a51d-cdbdafe1385e
Ennis, Sarah
7b57f188-9d91-4beb-b217-09856146f1e9
Snyder, Michael
80d23b2c-a023-43ae-8870-5fba7a144c5b
Takahashi, Shinichi
8f48ee18-0ffb-41d2-9ac6-5b14ca39b716
Andreoletti, Gaia
75cfc74e-f938-48c8-b3d5-5b377297d008
Chen, Rui
941fa635-535a-425b-86bb-3ef9476bb571
Munehira, Yoichi
6fccae4d-5b87-4c99-b189-8d4bb1325dc6
Batra, Akshay
822f891e-87ca-41d9-b68d-27c395e88809
Afzal, Nadeem A.
5148f35e-6788-4dbd-a50f-c303a4948d60
Beattie, R Mark
609ef780-5092-45be-9cca-7d8fe7eb4fd0
Bernstein, Jonathan A.
6ec42319-d124-4ded-a51d-cdbdafe1385e
Ennis, Sarah
7b57f188-9d91-4beb-b217-09856146f1e9
Snyder, Michael
80d23b2c-a023-43ae-8870-5fba7a144c5b

Takahashi, Shinichi, Andreoletti, Gaia, Chen, Rui, Munehira, Yoichi, Batra, Akshay, Afzal, Nadeem A., Beattie, R Mark, Bernstein, Jonathan A., Ennis, Sarah and Snyder, Michael (2017) De novo and rare mutations in the HSPA1L heat shock gene associated with inflammatory bowel disease. Genome Medicine, 9 (1), 1-11, [8]. (doi:10.1186/s13073-016-0394-9).

Record type: Article

Abstract

Background: Inflammatory bowel disease (IBD) is a chronic, relapsing inflammatory disease of the gastrointestinal tract which includes ulcerative colitis and Crohn's disease. Genetic risk factors for IBD are not well understood.

Methods: We performed a family-based whole exome sequencing (WES) analysis on a core family (Family A) to identify potential causal mutations and then analyzed exome data from a Caucasian pediatric cohort (136 patients and 106 controls) to validate the presence of mutations in the candidate gene, heat shock 70 kDa protein 1-like (HSPA1L). Biochemical assays of the de novo and rare (minor allele frequency, MAF < 0.01) mutation variant proteins further validated the predicted deleterious effects of the identified alleles.

Results: In the proband of Family A, we found a heterozygous de novo mutation (c.830C > T; p.Ser277Leu) in HSPA1L. Through analysis of WES data of 136 patients, we identified five additional rare HSPA1L mutations (p.Gly77Ser, p.Leu172del, p.Thr267Ile, p.Ala268Thr, p.Glu558Asp) in six patients. In contrast, rare HSPA1L mutations were not observed in controls, and were significantly enriched in patients (P = 0.02). Interestingly, we did not find non-synonymous rare mutations in the HSP70 isoforms HSPA1A and HSPA1B. Biochemical assays revealed that all six rare HSPA1L variant proteins showed decreased chaperone activity in vitro. Moreover, three variants demonstrated dominant negative effects on HSPA1L and HSPA1A protein activity.

Conclusions: Our results indicate that de novo and rare mutations in HSPA1L are associated with IBD and provide insights into the pathogenesis of IBD, and also expand our understanding of the roles of HSP70s in human disease.

Text
13073_2016_394_OnlinePDF.pdf - Version of Record
Available under License Creative Commons Attribution.
Download (1MB)

More information

Accepted/In Press date: 23 December 2016
e-pub ahead of print date: 26 January 2017
Published date: 26 January 2017
Organisations: Human Development & Health

Identifiers

Local EPrints ID: 404884
URI: http://eprints.soton.ac.uk/id/eprint/404884
PURE UUID: a6314e1e-80d1-4665-865a-1586fa1a1bac
ORCID for Sarah Ennis: ORCID iD orcid.org/0000-0003-2648-0869

Catalogue record

Date deposited: 18 Jan 2017 14:45
Last modified: 16 Mar 2024 03:07

Export record

Altmetrics

Contributors

Author: Shinichi Takahashi
Author: Gaia Andreoletti
Author: Rui Chen
Author: Yoichi Munehira
Author: Akshay Batra
Author: Nadeem A. Afzal
Author: R Mark Beattie
Author: Jonathan A. Bernstein
Author: Sarah Ennis ORCID iD
Author: Michael Snyder

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×