Annals of clinical and translational neurology · 2025
Insights Into the Antigenic Repertoire of Unclassified Synaptic Antibodies.
СтатьяПоддержка исследования: вне правительства СШАНазвание и аннотация: Перевод в очереди
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Gilligan Michael, Mills John R, Vargas Paulina, Paramasivan Naveen K, Lesnick Connie E, Basal Eati, Dasari Surendra, Fryer James P, Hinson Shannon R, Laporta Joseph, Espinal Amy, Fitzgerald Dennis, Garcia Carolina, Morenkova Anna E, Pergami Paola, Shah Anna, Knight Andrew, LaFrance Corey Reghann, Lennon Vanda A, Zekeridou Anastasia, Pittock Sean J, Dubey Divyanshu, McKeon Andrew
Аннотация
OBJECTIVE: We sought to characterize the sixth most common finding in our neuroimmunological laboratory practice (tissue assay-observed unclassified neural antibodies [UNAs]), combining protein microarray and phage immunoprecipitation sequencing (PhIP-Seq).
METHODS: Patient specimens (258; 133 serums; 125 CSF) meeting UNA criteria were profiled; October 2022-September 2023. Top-ranking candidate antigens were validated in silico, by dual-staining confocal microscopy, and ≥ 1 protein-specific assay. Clinical data were reviewed.
RESULTS: Among 21 patients, 11 autoantibodies were characterized (serum, 19; CSF, all 9 available). Autoantigens were CACNA1I, 1; CAMK2B, 2; CLIP2, 1; FMN2, 2; MAP1A, 2; MAP2, 5; NECAB1, 1; SNAP91, 3; SRCIN1, 1; SYNJ1, 1; SYT3, 2. Analytical validation was by confocal TIIFA (all), western blot (10/10 available), and cell-based assay (5/5 performed). Clinical accompaniments were: encephalitis, 6; brainstem encephalitis, 2; encephalomyelitis, 2; cerebellar ataxia, 2; longitudinally extensive transverse myelitis (LETM), 2; sensory neuronopathy, 1; peripheral neuropathy, 4, and movement disorders, 2. Inflammatory MRI abnormalities were identified in 5/16 patients (31%) with CNS disorders: T2 signal change (2), LETM (2), leptomeningeal enhancement (1). Seven of 8 (88%) had inflammatory CSF (pleocytosis, 5 [median 25.5 cells, range 7-294]; elevated IgG index/synthesis rate, 4; CSF-exclusive oligoclonal bands, 4). Six had paraneoplastic causation (lung cancer, 2; other, 4); 3 were postinfectious (1 each of COVID-19, HSV-1, and post-Group A streptococcal infection). Of 9 immunotherapy-treated patients, 5 improved.
INTERPRETATION: UNAs are partly accounted for by a repertoire of diverse mostly intracellular synaptic antigens. Their characterization is expedited by protein arrays and PhIPSeq. Further individual studies are needed to assess them as disease biomarkers.
METHODS: Patient specimens (258; 133 serums; 125 CSF) meeting UNA criteria were profiled; October 2022-September 2023. Top-ranking candidate antigens were validated in silico, by dual-staining confocal microscopy, and ≥ 1 protein-specific assay. Clinical data were reviewed.
RESULTS: Among 21 patients, 11 autoantibodies were characterized (serum, 19; CSF, all 9 available). Autoantigens were CACNA1I, 1; CAMK2B, 2; CLIP2, 1; FMN2, 2; MAP1A, 2; MAP2, 5; NECAB1, 1; SNAP91, 3; SRCIN1, 1; SYNJ1, 1; SYT3, 2. Analytical validation was by confocal TIIFA (all), western blot (10/10 available), and cell-based assay (5/5 performed). Clinical accompaniments were: encephalitis, 6; brainstem encephalitis, 2; encephalomyelitis, 2; cerebellar ataxia, 2; longitudinally extensive transverse myelitis (LETM), 2; sensory neuronopathy, 1; peripheral neuropathy, 4, and movement disorders, 2. Inflammatory MRI abnormalities were identified in 5/16 patients (31%) with CNS disorders: T2 signal change (2), LETM (2), leptomeningeal enhancement (1). Seven of 8 (88%) had inflammatory CSF (pleocytosis, 5 [median 25.5 cells, range 7-294]; elevated IgG index/synthesis rate, 4; CSF-exclusive oligoclonal bands, 4). Six had paraneoplastic causation (lung cancer, 2; other, 4); 3 were postinfectious (1 each of COVID-19, HSV-1, and post-Group A streptococcal infection). Of 9 immunotherapy-treated patients, 5 improved.
INTERPRETATION: UNAs are partly accounted for by a repertoire of diverse mostly intracellular synaptic antigens. Their characterization is expedited by protein arrays and PhIPSeq. Further individual studies are needed to assess them as disease biomarkers.