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LACC1 deficiency links juvenile arthritis with autophagy and metabolism in macrophages.

ABSTRACT: Juvenile idiopathic arthritis is the most common chronic rheumatic disease in children, and its etiology remains poorly understood. Here, we explored four families with early-onset arthritis carrying homozygous loss-of-expression mutations in LACC1. To understand the link between LACC1 and inflammation, we performed a functional study of LACC1 in human immune cells. We showed that LACC1 was primarily expressed in macrophages upon mTOR signaling. We found that LACC1 deficiency had no obvious impact on inflammasome activation, type I interferon response, or NF-κB regulation. Using bimolecular fluorescence complementation and biochemical assays, we showed that autophagy-inducing proteins, RACK1 and AMPK, interacted with LACC1. Autophagy blockade in macrophages was associated with LACC1 cleavage and degradation. Moreover, LACC1 deficiency reduced autophagy flux in primary macrophages. This was associated with a defect in the accumulation of lipid droplets and mitochondrial respiration, suggesting that LACC1-dependent autophagy fuels macrophage bioenergetics metabolism. Altogether, LACC1 deficiency defines a novel form of genetically inherited juvenile arthritis associated with impaired autophagy in macrophages.

SUBMITTER: Omarjee O

PROVIDER: S-EPMC7901146 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature

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LACC1 deficiency links juvenile arthritis with autophagy and metabolism in macrophages.

Omarjee Ommar O Mathieu Anne-Laure AL Quiniou Gaëlle G Moreews Marion M Ainouze Michelle M Frachette Cécile C Melki Isabelle I Dumaine Cécile C Gerfaud-Valentin Mathieu M Duquesne Agnès A Kallinich Tilmann T Tahir Turanli Eda E Malcus Christophe C Viel Sébastien S Pescarmona Rémi R Georgin-Lavialle Sophie S Jamilloux Yvan Y Larbre Jean-Paul JP Sarrabay Guillaume G Magnotti Flora F Rice Gillian I GI Bleicher Francoise F Reboulet Jonathan J Merabet Samir S Henry Thomas T Crow Yanick J YJ Faure Mathias M Walzer Thierry T Belot Alexandre A

The Journal of experimental medicine 20210301 3

Juvenile idiopathic arthritis is the most common chronic rheumatic disease in children, and its etiology remains poorly understood. Here, we explored four families with early-onset arthritis carrying homozygous loss-of-expression mutations in LACC1. To understand the link between LACC1 and inflammation, we performed a functional study of LACC1 in human immune cells. We showed that LACC1 was primarily expressed in macrophages upon mTOR signaling. We found that LACC1 deficiency had no obvious impa ...[more]

PMID: 33606008

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Project description:BackgroundSome juvenile idiopathic arthritis (JIA) patients have a familial aggregation of the disease, and a few have been found to have a juvenile arthritis (JA) phenotype caused by a genetic mutation. JA due to LACC1 defects is a rare condition and it was never reported in China.MethodsThe clinical and molecular characteristics of a child with LACC1 gene mutation-related juvenile arthritis, diagnosed by high-throughput sequencing in Wuhan children's Hospital in 2021 were analyzed retrospectively; The literature and database were reviewed to summarize the clinical data and genotype characteristics of patients with JA caused by LACC1 gene mutation.ResultsHere, we report a 19-month-old Chinese male patient who presented with bilateral limb edema without a history of fever. Laboratory tests showed had moderate anemia and signs of inflammation: hemoglobin of 76 g/L, white blood cell count of 20.53 × 109 , and platelet count of 1194 × 109 ; MRI showed the patient had synovitis and tenosynovitis in bilateral hands and wrists. Whole-exome sequencing (WES) detected compound heterozygous variants, novel c.446_449dupTAAA and c.889T>C, in the LACC1 gene. Of the 52 patients reported in the literature (including this case), 38.9% had clinical symptoms of systemic juvenile idiopathic arthritis (sJIA), which tended to be caused by loss-of-function (LOF) mutation. Findings in this study expanded the spectrum of pathogenic variants and reveal the phenotypic heterogeneity of LACC1-JA.ConclusionsOur study reported a rare case of juvenile arthritis, which is due to the compound heterozygous mutation of LACC1, including a new novel frameshift mutation c.446_449dupTAAA, and LACC1 C297R variant causes disease by potentially modifying the local conformation of proteins. The clinical and genetic findings in our study show that LACC1-JA is highly heterogeneous, and gene testing is required for juvenile arthritis patients with a high inflammatory response at a young onset age.

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LACC1 deficiency links juvenile arthritis with autophagy and metabolism in macrophages.

Publications

LACC1 deficiency links juvenile arthritis with autophagy and metabolism in macrophages.

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