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1.
Am J Hum Genet ; 108(7): 1301-1317, 2021 07 01.
Artículo en Inglés | MEDLINE | ID: mdl-34038740

RESUMEN

Human C2orf69 is an evolutionarily conserved gene whose function is unknown. Here, we report eight unrelated families from which 20 children presented with a fatal syndrome consisting of severe autoinflammation and progredient leukoencephalopathy with recurrent seizures; 12 of these subjects, whose DNA was available, segregated homozygous loss-of-function C2orf69 variants. C2ORF69 bears homology to esterase enzymes, and orthologs can be found in most eukaryotic genomes, including that of unicellular phytoplankton. We found that endogenous C2ORF69 (1) is loosely bound to mitochondria, (2) affects mitochondrial membrane potential and oxidative respiration in cultured neurons, and (3) controls the levels of the glycogen branching enzyme 1 (GBE1) consistent with a glycogen-storage-associated mitochondriopathy. We show that CRISPR-Cas9-mediated inactivation of zebrafish C2orf69 results in lethality by 8 months of age due to spontaneous epileptic seizures, which is preceded by persistent brain inflammation. Collectively, our results delineate an autoinflammatory Mendelian disorder of C2orf69 deficiency that disrupts the development/homeostasis of the immune and central nervous systems.


Asunto(s)
Encefalitis/genética , Enfermedades Mitocondriales/genética , Animales , Evolución Biológica , Sistemas CRISPR-Cas , Línea Celular , Encefalitis/mortalidad , Femenino , Genes Recesivos , Glucógeno/metabolismo , Humanos , Inflamación/genética , Masculino , Proteínas de la Membrana/genética , Enfermedades Mitocondriales/mortalidad , Linaje , Convulsiones/genética , Convulsiones/mortalidad , Pez Cebra/genética
3.
Nat Genet ; 54(8): 1214-1226, 2022 08.
Artículo en Inglés | MEDLINE | ID: mdl-35864190

RESUMEN

Cirrhosis is usually a late-onset and life-threatening disease characterized by fibrotic scarring and inflammation that disrupts liver architecture and function. While it is typically the result of alcoholism or hepatitis viral infection in adults, its etiology in infants is much less understood. In this study, we report 14 children from ten unrelated families presenting with a syndromic form of pediatric liver cirrhosis. By genome/exome sequencing, we found recessive variants in FOCAD segregating with the disease. Zebrafish lacking focad phenocopied the human disease, revealing a signature of altered messenger RNA (mRNA) degradation processes in the liver. Using patient's primary cells and CRISPR-Cas9-mediated inactivation in human hepatic cell lines, we found that FOCAD deficiency compromises the SKI mRNA surveillance pathway by reducing the levels of the RNA helicase SKIC2 and its cofactor SKIC3. FOCAD knockout hepatocytes exhibited lowered albumin expression and signs of persistent injury accompanied by CCL2 overproduction. Our results reveal the importance of FOCAD in maintaining liver homeostasis and disclose a possible therapeutic intervention point via inhibition of the CCL2/CCR2 signaling axis.


Asunto(s)
Cirrosis Hepática , Proteínas Supresoras de Tumor , Adulto , Animales , Niño , Hepatocitos/metabolismo , Humanos , Hígado/metabolismo , Cirrosis Hepática/genética , Cirrosis Hepática/metabolismo , ARN Mensajero/genética , ARN Mensajero/metabolismo , Síndrome , Proteínas Supresoras de Tumor/genética , Pez Cebra/genética
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