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Mambueni HM, Hue C, Jobart-Malfait A, Said-Nahal R, El Hafci H, Petite H, Nich C, Breban M, Costantino F, Garchon HJ. Targeted resequencing of the 13q13 spondyloarthritis-linked locus identifies a rare variant in FREM2 possibly associated with familial spondyloarthritis. Joint Bone Spine 2022; 89:105419. [PMID: 35640836 DOI: 10.1016/j.jbspin.2022.105419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 05/03/2022] [Accepted: 05/19/2022] [Indexed: 11/16/2022]
Abstract
OBJECTIVES The strong heritability of spondyloarthritis remains poorly explained, despite several large-scale association studies. A recent linkage analysis identified a new region linked to SpA on 13q13. Here we searched for variants potentially explaining this linkage signal by deep-sequencing of the region. METHODS Re-sequencing of the 1.4 Mb target interval was performed in 92 subjects from the 43 best-linked multicases families (71 spondyloarthritis and 21 unaffected relatives), using hybridization capture-based protocol (Illumina Nextera®). Variants of interest were then genotyped by TaqMan and high resolution melting to check their co-segregation with disease in the same families and to test their association with spondyloarthritis in an independent cohort of 1,091 unrelated cases and 399 controls. Expression of FREM2 was assessed by immunostaining. RESULTS Of the 7,563 variants identified, 24 were non-synonymous coding single-nucleotide variants. Two of them were located in the FREM2 gene on a haplotype co-segregating with the disease, including one common variant (R1840W, minor allele frequency=0.11) and one rare variant (R727H, minor allele frequency=0.0001). In the case-control analysis, there was no significant association between R1840W and spondyloarthritis (P-value=0.21), whereas R727H was not detected in any of the genotyped individuals. Immunostaining experiments revealed that FREM2 is expressed in synovial membrane, cartilage and colon. CONCLUSIONS Targeted re-sequencing of a spondyloarthritis-linked region allowed us to identify a rare non-synonymous coding variant in FREM2, co-segregating with spondyloarthritis in a large family. This gene is expressed in several tissues relevant to spondyloarthritis pathogenesis, supporting its putative implication in spondyloarthritis.
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Affiliation(s)
- Hendrick Mambu Mambueni
- Infection & Inflammation, UMR 1173, Inserm, UVSQ/Université Paris Saclay, Laboratory of Excellence INFLAMEX, 2, avenue de la Source de la Bièvre, 78180 Montigny-le-Bretonneux, France
| | - Christophe Hue
- Infection & Inflammation, UMR 1173, Inserm, UVSQ/Université Paris Saclay, Laboratory of Excellence INFLAMEX, 2, avenue de la Source de la Bièvre, 78180 Montigny-le-Bretonneux, France
| | - Aude Jobart-Malfait
- Infection & Inflammation, UMR 1173, Inserm, UVSQ/Université Paris Saclay, Laboratory of Excellence INFLAMEX, 2, avenue de la Source de la Bièvre, 78180 Montigny-le-Bretonneux, France
| | - Roula Said-Nahal
- Rheumatology Department, AP-HP, Ambroise Paré Hospital, 92100 Boulogne-Billancourt, France
| | - Hanane El Hafci
- Laboratory of Osteoarticular Biology, Bioingeneering and Bioimaging, UMR CNRS 7052 INSERM U1271, Paris, France
| | - Hervé Petite
- Laboratory of Osteoarticular Biology, Bioingeneering and Bioimaging, UMR CNRS 7052 INSERM U1271, Paris, France
| | - Christophe Nich
- Laboratory of Osteoarticular Biology, Bioingeneering and Bioimaging, UMR CNRS 7052 INSERM U1271, Paris, France; Université de Nantes, Orthopedics and Trauma Department, University Hospital Hôtel-Dieu, CHU de Nantes, Nantes, France
| | - Maxime Breban
- Infection & Inflammation, UMR 1173, Inserm, UVSQ/Université Paris Saclay, Laboratory of Excellence INFLAMEX, 2, avenue de la Source de la Bièvre, 78180 Montigny-le-Bretonneux, France; Rheumatology Department, AP-HP, Ambroise Paré Hospital, 92100 Boulogne-Billancourt, France
| | - Félicie Costantino
- Infection & Inflammation, UMR 1173, Inserm, UVSQ/Université Paris Saclay, Laboratory of Excellence INFLAMEX, 2, avenue de la Source de la Bièvre, 78180 Montigny-le-Bretonneux, France; Rheumatology Department, AP-HP, Ambroise Paré Hospital, 92100 Boulogne-Billancourt, France
| | - Henri-Jean Garchon
- Infection & Inflammation, UMR 1173, Inserm, UVSQ/Université Paris Saclay, Laboratory of Excellence INFLAMEX, 2, avenue de la Source de la Bièvre, 78180 Montigny-le-Bretonneux, France; Genetics Department, AP-HP, Ambroise Paré Hospital, 92100 Boulogne-Billancourt, France.
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