Abstract
Inappropriate stimulation or defective negative regulation of the type I interferon response can lead to autoinflammation. In genetically uncharacterized cases of the type I interferonopathy Aicardi-Goutières syndrome, we identified biallelic mutations in LSM11 and RNU7-1, which encode components of the replication-dependent histone pre-mRNA-processing complex. Mutations were associated with the misprocessing of canonical histone transcripts and a disturbance of linker histone stoichiometry. Additionally, we observed an altered distribution of nuclear cyclic guanosine monophosphate-adenosine monophosphate synthase (cGAS) and enhanced interferon signaling mediated by the cGAS-stimulator of interferon genes (STING) pathway in patient-derived fibroblasts. Finally, we established that chromatin without linker histone stimulates cyclic guanosine monophosphate-adenosine monophosphate (cGAMP) production in vitro more efficiently. We conclude that nuclear histones, as key constituents of chromatin, are essential in suppressing the immunogenicity of self-DNA.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Autoimmune Diseases of the Nervous System / genetics
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Autoimmune Diseases of the Nervous System / immunology
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Cell Line
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Chromatin / metabolism*
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DNA / immunology
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Gene Expression Regulation / genetics
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Gene Expression Regulation / immunology
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HCT116 Cells
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HEK293 Cells
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Hereditary Autoinflammatory Diseases / genetics
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Hereditary Autoinflammatory Diseases / immunology
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Histones / metabolism*
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Humans
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Interferon Type I / biosynthesis*
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Membrane Proteins / metabolism
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Nervous System Malformations / genetics
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Nervous System Malformations / immunology
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Nucleotides, Cyclic / biosynthesis
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Nucleotidyltransferases / metabolism
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RNA Precursors / metabolism*
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RNA-Binding Proteins / genetics*
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Ribonucleoprotein, U7 Small Nuclear / genetics*
Substances
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Chromatin
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Histones
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Interferon Type I
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Lsm11 protein, human
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Membrane Proteins
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Nucleotides, Cyclic
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RNA Precursors
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RNA-Binding Proteins
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Ribonucleoprotein, U7 Small Nuclear
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STING1 protein, human
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cyclic guanosine monophosphate-adenosine monophosphate
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DNA
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Nucleotidyltransferases
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cGAS protein, human
Supplementary concepts
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Aicardi-Goutieres syndrome