- Subscribe
- Log In More
Log in via Institution
Log in via OpenAthens
Log in using your username and password
- Basket
- Search More
Advanced search
- Latest content
- Current issue
- Archive
- Authors
- About
- Podcasts
Advanced search
- CloseMore
Main menu
- Latest content
- Current issue
- Archive
- Authors
- About
- Podcasts
See AlsoP3GNN: A Privacy-Preserving Provenance Graph-Based Model for APT Detection in Software Defined NetworkingPOS1186 EVALUATION OF A SCREENING TEST FOR VEXAS SYNDROME USING THE BORDEAUX UNIVERSITY HOSPITAL BIOMEDICAL DATA WAREHOUSEAirway inflammation and mannitol challenge test in COPDEnhancing the Efficiency of Resilient Multipath-Routed Elastic Optical Networks: A Novel Approach for Coexisting Protected and Unprotected Services with Idle Slot Reuse - Subscribe
- Log in More
Log in via Institution
Log in via OpenAthens
Log in using your username and password
- BMJ Journals
You are here
- Home
- Archive
- Volume 83,Issue Suppl 1
- OP0055 LACC1 MUTATION IN MULTIPLE CONSANGUINEOUS FAMILIES CAUSING REFRACTORY JUVENILE IDIOPATHIC ARTHRITIS
Email alerts
Article Text
Article menu
- Article Text
- Article info
- Citation Tools
- Share
- Rapid Responses
- Article metrics
- Alerts
Scientific Abstracts
Oral Abstract Presentations
Paediatric Abstract Sessions: Advances in JIA Research
OP0055 LACC1 MUTATION IN MULTIPLE CONSANGUINEOUS FAMILIES CAUSING REFRACTORY JUVENILE IDIOPATHIC ARTHRITIS
Abstract
Background: Juvenile idiopathic arthritis (JIA); the most common arthropathy in children; is hypothesized to be triggered by many factors including genetic susceptibility[1]. Several reports have underlined inherited variants underlying JIA phenotype[2]. Of those, genetic variants in LACC1 were associated with familial JIA with different phenotypes[3-5].
Objectives: To report the clinical and genetic presentation of a novel LACC1 variant in multiple affected patients with JIA from a large consanguine extended family.
Methods: The patients were identified through our JIA Genomics Cohort. The cohort’s aim is to analyze relevant genetic variants in JIA. Informed consent was obtained (IRB# DOH/CVDC/2022/248). Whole exome sequencing (WES) was performed. The genetic findings were analyzed in the context of the clinical presentation and were confirmed using sanger sequencing.
Results: Genetic analysis via WES revealed a hom*ozygous LACC1 variant at c.658G>A (p. Asp220Asn) in four JIA related patients that is classified as variant of unknow significance (VUS). Figure 1 demonstrates the family pedigree highlighting the affected patients and their heterozygous carrier relatives. LACC1 variant c.658G>A (p. Asp220Asn) is a rare novel variant not reported previously in the literature or any public databases (1000 Genomes, ExAC, GnomAD, or Exome Variant Server). In silico pathogenicity prediction tools predicted damaging effect of the variant (PolyPhen2: Damaging 1, SIFT: Damaging 1, PhyloP: Conserved 8.40, GERP++: Conserved 16.34, CADD: uncertain: 28.8). Clinical and laboratory features are presented in Table 1. All four patients have non-systemic seronegative JIA phenotype with different severities. Patient 3 has alopecia and psoriasis confirmed on skin biopsy. Patient 4 has persistent bilateral lower limb lymphedema, a unique feature that was reported in connection with LACC1 mutations[3,4]. Patients 3 and 4 had poor response to treatment and notable recurrent pneumonias on tocilizumab.
Conclusion: LACC1 genetic variants contribute to a monogenic of JIA. This study supports prior literature linking LACC1 mutations to inherited and refractory type of JIA with different phenotypes. Aside from refractory arthritis, one patient also presented with persistent lymphedema in line with what has been reported in the literature[3,4].
REFERENCES: [1] Cobb JE, Hinks A, Thomson W. The genetics of juvenile idiopathic arthritis: current understanding and future prospects. Rheumatology (Oxford). 2014 Apr;53(4):592-9.
[2] Hersh AO, Prahalad S. Genetics of Juvenile Idiopathic Arthritis. Rheum Dis Clin North Am. 2017 Aug;43(3):435-448.
[3] Al-Mayouf SM, Yateem M, Al-Dusery H, Monies D, Wakil S, AlShiakh M, AlEnazi A, Aladaileh B, Alzyoud R, Meyer B. New or vanishing frontiers: LACC1-associated juvenile arthritis. Int J Pediatr Adolesc Med. 2021 Mar;8(1):44-47.
[4] Rabionet R, Remesal A, Mensa-Vilaró A, Murías S, Alcobendas R, González-Roca E, Ruiz-Ortiz E, Antón J, Iglesias E, Modesto C, Comas D, Puig A, Drechsel O, Ossowski S, Yagüe J, Merino R, Estivill X, Arostegui JI. Biallelic loss-of-function LACC1/FAMIN Mutations Presenting as Rheumatoid Factor-Negative Polyarticular Juvenile Idiopathic Arthritis. Sci Rep. 2019 Mar 14;9(1):4579.
[5] Butbul Aviel Y, Ofir A, Ben-Izhak O, Vlodavsky E, Karbian N, Brik R, Mevorach D, Magen D. A novel loss-of-function mutation in LACC1 underlies hereditary juvenile arthritis with extended intra-familial phenotypic heterogeneity. Rheumatology (Oxford). 2021 Oct 2;60(10):4888-4898.
- Download figure
- Open in new tab
- Download powerpoint
Figure 1.
Family pedigree of the three consanguineous families and four affected patients. All affected patients had LACC1 hom*ozygous variant at c.658G>A (p. Asp220Asn) and presented with JIA phenotype (solid color, HOM). Parents of all affected patients were unaffected heterozygous carriers for the same variant (HET).
- Download figure
- Open in new tab
- Download powerpoint
Acknowledgements: NIL.
Disclosure of Interests: None declared.
- Biomarkers
- Genetics
Statistics from Altmetric.com
Request Permissions
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.
- Biomarkers
- Genetics
Read the full text or download the PDF:
Subscribe
Log in via Institution
Log in via OpenAthens
Log in using your username and password
Read the full text or download the PDF:
Subscribe
Log in via Institution
Log in via OpenAthens