Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 60
Filtrar
Más filtros

Banco de datos
Tipo del documento
Intervalo de año de publicación
1.
Cell ; 186(3): 621-645.e33, 2023 02 02.
Artículo en Inglés | MEDLINE | ID: mdl-36736301

RESUMEN

Inborn errors of human IFN-γ-dependent macrophagic immunity underlie mycobacterial diseases, whereas inborn errors of IFN-α/ß-dependent intrinsic immunity underlie viral diseases. Both types of IFNs induce the transcription factor IRF1. We describe unrelated children with inherited complete IRF1 deficiency and early-onset, multiple, life-threatening diseases caused by weakly virulent mycobacteria and related intramacrophagic pathogens. These children have no history of severe viral disease, despite exposure to many viruses, including SARS-CoV-2, which is life-threatening in individuals with impaired IFN-α/ß immunity. In leukocytes or fibroblasts stimulated in vitro, IRF1-dependent responses to IFN-γ are, both quantitatively and qualitatively, much stronger than those to IFN-α/ß. Moreover, IRF1-deficient mononuclear phagocytes do not control mycobacteria and related pathogens normally when stimulated with IFN-γ. By contrast, IFN-α/ß-dependent intrinsic immunity to nine viruses, including SARS-CoV-2, is almost normal in IRF1-deficient fibroblasts. Human IRF1 is essential for IFN-γ-dependent macrophagic immunity to mycobacteria, but largely redundant for IFN-α/ß-dependent antiviral immunity.


Asunto(s)
COVID-19 , Mycobacterium , Niño , Humanos , Interferón gamma , SARS-CoV-2 , Interferón-alfa , Factor 1 Regulador del Interferón
2.
Cell ; 184(14): 3812-3828.e30, 2021 07 08.
Artículo en Inglés | MEDLINE | ID: mdl-34214472

RESUMEN

We study a patient with the human papilloma virus (HPV)-2-driven "tree-man" phenotype and two relatives with unusually severe HPV4-driven warts. The giant horns form an HPV-2-driven multifocal benign epithelial tumor overexpressing viral oncogenes in the epidermis basal layer. The patients are unexpectedly homozygous for a private CD28 variant. They have no detectable CD28 on their T cells, with the exception of a small contingent of revertant memory CD4+ T cells. T cell development is barely affected, and T cells respond to CD3 and CD2, but not CD28, costimulation. Although the patients do not display HPV-2- and HPV-4-reactive CD4+ T cells in vitro, they make antibodies specific for both viruses in vivo. CD28-deficient mice are susceptible to cutaneous infections with the mouse papillomavirus MmuPV1. The control of HPV-2 and HPV-4 in keratinocytes is dependent on the T cell CD28 co-activation pathway. Surprisingly, human CD28-dependent T cell responses are largely redundant for protective immunity.


Asunto(s)
Antígenos CD28/deficiencia , Patrón de Herencia/genética , Papillomaviridae/fisiología , Piel/virología , Linfocitos T/inmunología , Adulto , Secuencia de Aminoácidos , Animales , Secuencia de Bases , Antígenos CD28/genética , Antígenos CD28/metabolismo , Linfocitos T CD4-Positivos/inmunología , Niño , Endopeptidasas/metabolismo , Femenino , Genes Recesivos , Células HEK293 , Homocigoto , Humanos , Inmunidad Humoral , Memoria Inmunológica , Células Jurkat , Queratinocitos/patología , Masculino , Ratones Endogámicos C57BL , Oncogenes , Papiloma/patología , Papiloma/virología , Linaje , Señales de Clasificación de Proteína , ARN Mensajero/genética , ARN Mensajero/metabolismo
3.
Nature ; 633(8029): 417-425, 2024 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-39198650

RESUMEN

Severe defects in human IFNγ immunity predispose individuals to both Bacillus Calmette-Guérin disease and tuberculosis, whereas milder defects predispose only to tuberculosis1. Here we report two adults with recurrent pulmonary tuberculosis who are homozygous for a private loss-of-function TNF variant. Neither has any other clinical phenotype and both mount normal clinical and biological inflammatory responses. Their leukocytes, including monocytes and monocyte-derived macrophages (MDMs) do not produce TNF, even after stimulation with IFNγ. Blood leukocyte subset development is normal in these patients. However, an impairment in the respiratory burst was observed in granulocyte-macrophage colony-stimulating factor (GM-CSF)-matured MDMs and alveolar macrophage-like (AML) cells2 from both patients with TNF deficiency, TNF- or TNFR1-deficient induced pluripotent stem (iPS)-cell-derived GM-CSF-matured macrophages, and healthy control MDMs and AML cells differentiated with TNF blockers in vitro, and in lung macrophages treated with TNF blockers ex vivo. The stimulation of TNF-deficient iPS-cell-derived macrophages with TNF rescued the respiratory burst. These findings contrast with those for patients with inherited complete deficiency of the respiratory burst across all phagocytes, who are prone to multiple infections, including both Bacillus Calmette-Guérin disease and tuberculosis3. Human TNF is required for respiratory-burst-dependent immunity to Mycobacterium tuberculosis in macrophages but is surprisingly redundant otherwise, including for inflammation and immunity to weakly virulent mycobacteria and many other infectious agents.


Asunto(s)
Macrófagos , Tuberculosis Pulmonar , Factores de Necrosis Tumoral , Adulto , Femenino , Humanos , Masculino , Factor Estimulante de Colonias de Granulocitos y Macrófagos/metabolismo , Homocigoto , Células Madre Pluripotentes Inducidas/metabolismo , Células Madre Pluripotentes Inducidas/inmunología , Células Madre Pluripotentes Inducidas/citología , Inflamación/inmunología , Interferón gamma/inmunología , Mutación con Pérdida de Función , Pulmón/citología , Pulmón/efectos de los fármacos , Macrófagos/citología , Macrófagos/efectos de los fármacos , Macrófagos/inmunología , Macrófagos/metabolismo , Macrófagos/patología , Macrófagos Alveolares/citología , Macrófagos Alveolares/efectos de los fármacos , Macrófagos Alveolares/inmunología , Macrófagos Alveolares/microbiología , Macrófagos Alveolares/patología , Mycobacterium tuberculosis/inmunología , Fenotipo , Especies Reactivas de Oxígeno/metabolismo , Receptores Tipo I de Factores de Necrosis Tumoral/deficiencia , Receptores Tipo I de Factores de Necrosis Tumoral/genética , Receptores Tipo I de Factores de Necrosis Tumoral/metabolismo , Estallido Respiratorio , Tuberculosis Pulmonar/inmunología , Tuberculosis Pulmonar/microbiología , Tuberculosis Pulmonar/genética , Inhibidores del Factor de Necrosis Tumoral/farmacología , Factores de Necrosis Tumoral/deficiencia , Factores de Necrosis Tumoral/genética , Adolescente , Adulto Joven
4.
Proc Natl Acad Sci U S A ; 121(37): e2321794121, 2024 Sep 10.
Artículo en Inglés | MEDLINE | ID: mdl-39231201

RESUMEN

We report two unrelated adults with homozygous (P1) or compound heterozygous (P2) private loss-of-function variants of V-Rel Reticuloendotheliosis Viral Oncogene Homolog B (RELB). The resulting deficiency of functional RelB impairs the induction of NFKB2 mRNA and NF-κB2 (p100/p52) protein by lymphotoxin in the fibroblasts of the patients. These defects are rescued by transduction with wild-type RELB complementary DNA (cDNA). By contrast, the response of RelB-deficient fibroblasts to Tumor Necrosis Factor (TNF) or IL-1ß via the canonical NF-κB pathway remains intact. P1 and P2 have low proportions of naïve CD4+ and CD8+ T cells and of memory B cells. Moreover, their naïve B cells cannot differentiate into immunoglobulin G (IgG)- or immunoglobulin A (IgA)-secreting cells in response to CD40L/IL-21, and the development of IL-17A/F-producing T cells is strongly impaired in vitro. Finally, the patients produce neutralizing autoantibodies against type I interferons (IFNs), even after hematopoietic stem cell transplantation, attesting to a persistent dysfunction of thymic epithelial cells in T cell selection and central tolerance to some autoantigens. Thus, inherited human RelB deficiency disrupts the alternative NF-κB pathway, underlying a T- and B cell immunodeficiency, which, together with neutralizing autoantibodies against type I IFNs, confers a predisposition to viral, bacterial, and fungal infections.


Asunto(s)
Inmunidad Adaptativa , Inmunidad Innata , Factor de Transcripción ReIB , Humanos , Factor de Transcripción ReIB/genética , Factor de Transcripción ReIB/metabolismo , Inmunidad Adaptativa/genética , Femenino , Masculino , Linfocitos B/inmunología , Subunidad p52 de NF-kappa B/genética , Subunidad p52 de NF-kappa B/metabolismo , Adulto , Fibroblastos/metabolismo , Fibroblastos/inmunología , Interferón Tipo I/inmunología , Interferón Tipo I/metabolismo
5.
Proc Natl Acad Sci U S A ; 118(3)2021 01 19.
Artículo en Inglés | MEDLINE | ID: mdl-33408250

RESUMEN

Genetic variants underlying life-threatening diseases, being unlikely to be transmitted to the next generation, are gradually and selectively eliminated from the population through negative selection. We study the determinants of this evolutionary process in human genes underlying monogenic diseases by comparing various negative selection scores and an integrative approach, CoNeS, at 366 loci underlying inborn errors of immunity (IEI). We find that genes underlying autosomal dominant (AD) or X-linked IEI have stronger negative selection scores than those underlying autosomal recessive (AR) IEI, whose scores are not different from those of genes not known to be disease causing. Nevertheless, genes underlying AR IEI that are lethal before reproductive maturity with complete penetrance have stronger negative selection scores than other genes underlying AR IEI. We also show that genes underlying AD IEI by loss of function have stronger negative selection scores than genes underlying AD IEI by gain of function, while genes underlying AD IEI by haploinsufficiency are under stronger negative selection than other genes underlying AD IEI. These results are replicated in 1,140 genes underlying inborn errors of neurodevelopment. Finally, we propose a supervised classifier, SCoNeS, which predicts better than state-of-the-art approaches whether a gene is more likely to underlie an AD or AR disease. The clinical outcomes of monogenic inborn errors, together with their mode and mechanisms of inheritance, determine the levels of negative selection at their corresponding loci. Integrating scores of negative selection may facilitate the prioritization of candidate genes and variants in patients suspected to carry an inborn error.


Asunto(s)
Inmunidad/genética , Errores Innatos del Metabolismo/genética , Selección Genética/genética , Genes Dominantes/genética , Genes Recesivos/genética , Variación Genética/genética , Variación Genética/inmunología , Humanos , Errores Innatos del Metabolismo/inmunología , Errores Innatos del Metabolismo/patología
6.
Proc Natl Acad Sci U S A ; 118(15)2021 04 13.
Artículo en Inglés | MEDLINE | ID: mdl-33876776

RESUMEN

Human inborn errors of IFN-γ underlie mycobacterial disease, due to insufficient IFN-γ production by lymphoid cells, impaired myeloid cell responses to this cytokine, or both. We report four patients from two unrelated kindreds with intermittent monocytosis and mycobacterial disease, including bacillus Calmette-Guérin-osis and disseminated tuberculosis, and without any known inborn error of IFN-γ. The patients are homozygous for ZNFX1 variants (p.S959* and p.E1606Rfs*10) predicted to be loss of function (pLOF). There are no subjects homozygous for pLOF variants in public databases. ZNFX1 is a conserved and broadly expressed helicase, but its biology remains largely unknown. It is thought to act as a viral double-stranded RNA sensor in mice, but these patients do not suffer from severe viral illnesses. We analyze its subcellular localization upon overexpression in A549 and HeLa cell lines and upon stimulation of THP1 and fibroblastic cell lines. We find that this cytoplasmic protein can be recruited to or even induce stress granules. The endogenous ZNFX1 protein in cell lines of the patient homozygous for the p.E1606Rfs*10 variant is truncated, whereas ZNFX1 expression is abolished in cell lines from the patients with the p.S959* variant. Lymphocyte subsets are present at normal frequencies in these patients and produce IFN-γ normally. The hematopoietic and nonhematopoietic cells of the patients tested respond normally to IFN-γ. Our results indicate that human ZNFX1 is associated with stress granules and essential for both monocyte homeostasis and protective immunity to mycobacteria.


Asunto(s)
Antígenos de Neoplasias/genética , Leucocitosis/genética , Infecciones por Mycobacterium no Tuberculosas/genética , Células A549 , Adolescente , Antígenos de Neoplasias/metabolismo , Células Cultivadas , Niño , Gránulos Citoplasmáticos/metabolismo , Femenino , Células HEK293 , Células HeLa , Homocigoto , Humanos , Lactante , Interferón gamma/metabolismo , Leucocitosis/patología , Masculino , Mutación , Infecciones por Mycobacterium no Tuberculosas/patología , Linaje , Células THP-1 , Adulto Joven
7.
N Engl J Med ; 382(5): 437-445, 2020 01 30.
Artículo en Inglés | MEDLINE | ID: mdl-31995689

RESUMEN

BACKGROUND: Cytomegalovirus (CMV) can cause severe disease in children and adults with a variety of inherited or acquired T-cell immunodeficiencies, who are prone to multiple infections. It can also rarely cause disease in otherwise healthy persons. The pathogenesis of idiopathic CMV disease is unknown. Inbred mice that lack the gene encoding nitric oxide synthase 2 (Nos2) are susceptible to the related murine CMV infection. METHODS: We studied a previously healthy 51-year-old man from Iran who after acute CMV infection had an onset of progressive CMV disease that led to his death 29 months later. We hypothesized that the patient may have had a novel type of inborn error of immunity. Thus, we performed whole-exome sequencing and tested candidate mutant alleles experimentally. RESULTS: We found a homozygous frameshift mutation in NOS2 encoding a truncated NOS2 protein that did not produce nitric oxide, which determined that the patient had autosomal recessive NOS2 deficiency. Moreover, all NOS2 variants that we found in homozygosity in public databases encoded functional proteins, as did all other variants with an allele frequency greater than 0.001. CONCLUSIONS: These findings suggest that inherited NOS2 deficiency was clinically silent in this patient until lethal infection with CMV. Moreover, NOS2 appeared to be redundant for control of other pathogens in this patient. (Funded by the National Center for Advancing Translational Sciences and others.).


Asunto(s)
Infecciones por Citomegalovirus , Mutación del Sistema de Lectura , Óxido Nítrico Sintasa de Tipo II/deficiencia , Resultado Fatal , Femenino , Genotipo , Homocigoto , Humanos , Mutación con Pérdida de Función , Masculino , Persona de Mediana Edad , Óxido Nítrico/metabolismo , Óxido Nítrico Sintasa de Tipo II/genética , Óxido Nítrico Sintasa de Tipo II/metabolismo , Linaje , Secuenciación del Exoma
8.
Proc Natl Acad Sci U S A ; 117(24): 13626-13636, 2020 06 16.
Artículo en Inglés | MEDLINE | ID: mdl-32487729

RESUMEN

Humans homozygous or hemizygous for variants predicted to cause a loss of function (LoF) of the corresponding protein do not necessarily present with overt clinical phenotypes. We report here 190 autosomal genes with 207 predicted LoF variants, for which the frequency of homozygous individuals exceeds 1% in at least one human population from five major ancestry groups. No such genes were identified on the X and Y chromosomes. Manual curation revealed that 28 variants (15%) had been misannotated as LoF. Of the 179 remaining variants in 166 genes, only 11 alleles in 11 genes had previously been confirmed experimentally to be LoF. The set of 166 dispensable genes was enriched in olfactory receptor genes (41 genes). The 41 dispensable olfactory receptor genes displayed a relaxation of selective constraints similar to that observed for other olfactory receptor genes. The 125 dispensable nonolfactory receptor genes also displayed a relaxation of selective constraints consistent with greater redundancy. Sixty-two of these 125 genes were found to be dispensable in at least three human populations, suggesting possible evolution toward pseudogenes. Of the 179 LoF variants, 68 could be tested for two neutrality statistics, and 8 displayed robust signals of positive selection. These latter variants included a known FUT2 variant that confers resistance to intestinal viruses, and an APOL3 variant involved in resistance to parasitic infections. Overall, the identification of 166 genes for which a sizeable proportion of humans are homozygous for predicted LoF alleles reveals both redundancies and advantages of such deficiencies for human survival.


Asunto(s)
Genética Humana , Mutación con Pérdida de Función , Alelos , Apolipoproteínas L/genética , Fucosiltransferasas/genética , Variación Genética , Homocigoto , Humanos , Proteínas/genética , Cromosomas Sexuales/genética , Galactósido 2-alfa-L-Fucosiltransferasa
9.
Proc Natl Acad Sci U S A ; 116(3): 950-959, 2019 01 15.
Artículo en Inglés | MEDLINE | ID: mdl-30591557

RESUMEN

Computational analyses of human patient exomes aim to filter out as many nonpathogenic genetic variants (NPVs) as possible, without removing the true disease-causing mutations. This involves comparing the patient's exome with public databases to remove reported variants inconsistent with disease prevalence, mode of inheritance, or clinical penetrance. However, variants frequent in a given exome cohort, but absent or rare in public databases, have also been reported and treated as NPVs, without rigorous exploration. We report the generation of a blacklist of variants frequent within an in-house cohort of 3,104 exomes. This blacklist did not remove known pathogenic mutations from the exomes of 129 patients and decreased the number of NPVs remaining in the 3,104 individual exomes by a median of 62%. We validated this approach by testing three other independent cohorts of 400, 902, and 3,869 exomes. The blacklist generated from any given cohort removed a substantial proportion of NPVs (11-65%). We analyzed the blacklisted variants computationally and experimentally. Most of the blacklisted variants corresponded to false signals generated by incomplete reference genome assembly, location in low-complexity regions, bioinformatic misprocessing, or limitations inherent to cohort-specific private alleles (e.g., due to sequencing kits, and genetic ancestries). Finally, we provide our precalculated blacklists, together with ReFiNE, a program for generating customized blacklists from any medium-sized or large in-house cohort of exome (or other next-generation sequencing) data via a user-friendly public web server. This work demonstrates the power of extracting variant blacklists from private databases as a specific in-house but broadly applicable tool for optimizing exome analysis.


Asunto(s)
Bases de Datos de Ácidos Nucleicos , Exoma , Variación Genética , Genoma Humano , Análisis de Secuencia de ADN , Programas Informáticos , Estudios de Cohortes , Femenino , Humanos , Masculino
10.
Proc Natl Acad Sci U S A ; 116(38): 19055-19063, 2019 09 17.
Artículo en Inglés | MEDLINE | ID: mdl-31484767

RESUMEN

Juvenile-onset recurrent respiratory papillomatosis (JRRP) is a rare and debilitating childhood disease that presents with recurrent growth of papillomas in the upper airway. Two common human papillomaviruses (HPVs), HPV-6 and -11, are implicated in most cases, but it is still not understood why only a small proportion of children develop JRRP following exposure to these common viruses. We report 2 siblings with a syndromic form of JRRP associated with mild dermatologic abnormalities. Whole-exome sequencing of the patients revealed a private homozygous mutation in NLRP1, encoding Nucleotide-Binding Domain Leucine-Rich Repeat Family Pyrin Domain-Containing 1. We find the NLRP1 mutant allele to be gain of function (GOF) for inflammasome activation, as demonstrated by the induction of inflammasome complex oligomerization and IL-1ß secretion in an overexpression system. Moreover, patient-derived keratinocytes secrete elevated levels of IL-1ß at baseline. Finally, both patients displayed elevated levels of inflammasome-induced cytokines in the serum. Six NLRP1 GOF mutations have previously been described to underlie 3 allelic Mendelian diseases with differing phenotypes and modes of inheritance. Our results demonstrate that an autosomal recessive, syndromic form of JRRP can be associated with an NLRP1 GOF mutation.


Asunto(s)
Proteínas Adaptadoras Transductoras de Señales/genética , Proteínas Reguladoras de la Apoptosis/genética , Mutación con Ganancia de Función , Homocigoto , Infecciones por Papillomavirus/genética , Infecciones por Papillomavirus/patología , Infecciones del Sistema Respiratorio/genética , Infecciones del Sistema Respiratorio/patología , Preescolar , Citocinas/metabolismo , Femenino , Humanos , Lactante , Inflamasomas , Queratinocitos/citología , Queratinocitos/inmunología , Queratinocitos/metabolismo , Masculino , Proteínas NLR , Linaje , Hermanos , Síndrome
11.
J Clin Immunol ; 41(3): 639-657, 2021 04.
Artículo en Inglés | MEDLINE | ID: mdl-33417088

RESUMEN

PURPOSE: Germline heterozygous mutations of GATA2 underlie a variety of hematological and clinical phenotypes. The genetic, immunological, and clinical features of GATA2-deficient patients with mycobacterial diseases in the familial context remain largely unknown. METHODS: We enrolled 15 GATA2 index cases referred for mycobacterial disease. We describe their genetic and clinical features including their relatives. RESULTS: We identified 12 heterozygous GATA2 mutations, two of which had not been reported. Eight of these mutations were loss-of-function, and four were hypomorphic. None was dominant-negative in vitro, and the GATA2 locus was found to be subject to purifying selection, strongly suggesting a mechanism of haploinsufficiency. Three relatives of index cases had mycobacterial disease and were also heterozygous, resulting in 18 patients in total. Mycobacterial infection was the first clinical manifestation in 11 patients, at a mean age of 22.5 years (range: 12 to 42 years). Most patients also suffered from other infections, monocytopenia, or myelodysplasia. Strikingly, the clinical penetrance was incomplete (32.9% by age 40 years), as 16 heterozygous relatives aged between 6 and 78 years, including 4 older than 60 years, were completely asymptomatic. CONCLUSION: Clinical penetrance for mycobacterial disease was found to be similar to other GATA2 deficiency-related manifestations. These observations suggest that other mechanisms contribute to the phenotypic expression of GATA2 deficiency. A diagnosis of autosomal dominant GATA2 deficiency should be considered in patients with mycobacterial infections and/or other GATA2 deficiency-related phenotypes at any age in life. Moreover, all direct relatives should be genotyped at the GATA2 locus.


Asunto(s)
Deficiencia GATA2/diagnóstico , Deficiencia GATA2/genética , Estudios de Asociación Genética , Predisposición Genética a la Enfermedad , Haploinsuficiencia , Penetrancia , Fenotipo , Adolescente , Adulto , Alelos , Línea Celular , Niño , Análisis Mutacional de ADN , Bases de Datos Genéticas , Femenino , Deficiencia GATA2/epidemiología , Genes Dominantes , Estudios de Asociación Genética/métodos , Genotipo , Mutación de Línea Germinal , Enfermedades Hematológicas/diagnóstico , Enfermedades Hematológicas/etiología , Humanos , Estimación de Kaplan-Meier , Masculino , Persona de Mediana Edad , Infecciones por Mycobacterium/diagnóstico , Infecciones por Mycobacterium/etiología , Evaluación de Resultado en la Atención de Salud , Linaje , Secuenciación del Exoma , Adulto Joven
12.
Biol Blood Marrow Transplant ; 25(6): 1142-1151, 2019 06.
Artículo en Inglés | MEDLINE | ID: mdl-30625392

RESUMEN

Mutational profiling has demonstrated utility in predicting the likelihood of disease progression in patients with myelofibrosis (MF). However, there is limited data regarding the prognostic utility of genetic profiling in MF patients undergoing allogeneic hematopoietic stem cell transplantation (allo-HCT). We performed high-throughput sequencing of 585 genes on pre-transplant samples from 101 patients with MF who underwent allo-HCT and evaluated the association of mutations and clinical variables with transplantation outcomes. Overall survival (OS) at 5 years post-transplantation was 52%, and relapse-free survival (RFS) was 51.1 % for this cohort. Nonrelapse mortality (NRM) accounted for most deaths. Patient's age, donor's age, donor type, and Dynamic International Prognostic Scoring System score at diagnosis did not predict for outcomes. Mutations known to be associated with increased risk of disease progression, such as ASXL1, SRSF2, IDH1/2, EZH2, and TP53, did not impact OS or RFS. The presence of U2AF1 (P = .007) or DNMT3A (P = .034) mutations was associated with worse OS. A Mutation-Enhanced International Prognostic Scoring System 70 score was available for 80 patients (79%), and there were no differences in outcomes between patients with high risk scores and those with intermediate and low risk scores. Collectively, these data identify mutational predictors of outcome in MF patients undergoing allo-HCT. These genetic biomarkers in conjunction with clinical variables may have important utility in guiding transplantation decision making.


Asunto(s)
Mielofibrosis Primaria/terapia , Anciano , Progresión de la Enfermedad , Femenino , Humanos , Masculino , Persona de Mediana Edad , Mutación , Mielofibrosis Primaria/patología , Pronóstico , Estudios Retrospectivos , Factores de Riesgo , Resultado del Tratamiento
13.
Bioinformatics ; 34(24): 4307-4309, 2018 12 15.
Artículo en Inglés | MEDLINE | ID: mdl-30535305

RESUMEN

Summary: Next-generation sequencing (NGS) generates large amounts of genomic data and reveals about 20 000 genetic coding variants per individual studied. Several mutation damage prediction scores are available to prioritize variants, but there is currently no application to help investigators to determine the relevance of the candidate genes and variants quickly and visually from population genetics data and deleteriousness scores. Here, we present PopViz, a user-friendly, rapid, interactive, mobile-compatible webserver providing a gene-centric visualization of the variants of any human gene, with (i) population-specific minor allele frequencies from the gnomAD population genetic database; (ii) mutation damage prediction scores from CADD, EIGEN and LINSIGHT and (iii) amino-acid positions and protein domains. This application will be particularly useful in investigations of NGS data for new disease-causing genes and variants, by reinforcing or rejecting the plausibility of the candidate genes, and by selecting and prioritizing, the candidate variants for experimental testing. Availability and implementation: PopViz webserver is freely accessible from http://shiva.rockefeller.edu/PopViz/. Supplementary information: Supplementary data are available at Bioinformatics online.


Asunto(s)
Frecuencia de los Genes , Variación Genética , Programas Informáticos , Biología Computacional , Genómica , Secuenciación de Nucleótidos de Alto Rendimiento , Humanos
14.
Blood ; 129(13): 1779-1790, 2017 Mar 30.
Artículo en Inglés | MEDLINE | ID: mdl-28077417

RESUMEN

Recent studies have reported that activation-induced cytidine deaminase (AID) and ten-eleven-translocation (TET) family members regulate active DNA demethylation. Genetic alterations of TET2 occur in myeloid malignancies, and hematopoietic-specific loss of Tet2 induces aberrant hematopoietic stem cell (HSC) self-renewal/differentiation, implicating TET2 as a master regulator of normal and malignant hematopoiesis. Despite the functional link between AID and TET in epigenetic gene regulation, the role of AID loss in hematopoiesis and myeloid transformation remains to be investigated. Here, we show that Aid loss in mice leads to expansion of myeloid cells and reduced erythroid progenitors resulting in anemia, with dysregulated expression of Cebpa and Gata1, myeloid/erythroid lineage-specific transcription factors. Consistent with data in the murine context, silencing of AID in human bone marrow cells skews differentiation toward myelomonocytic lineage. However, in contrast to Tet2 loss, Aid loss does not contribute to enhanced HSC self-renewal or cooperate with Flt3-ITD to induce myeloid transformation. Genome-wide transcription and differential methylation analysis uncover the critical role of Aid as a key epigenetic regulator. These results indicate that AID and TET2 share common effects on myeloid and erythroid lineage differentiation, however, their role is nonredundant in regulating HSC self-renewal and in myeloid transformation.


Asunto(s)
Diferenciación Celular , Citidina Desaminasa/fisiología , Metilación de ADN , Células Madre Hematopoyéticas/metabolismo , Animales , Linaje de la Célula , Autorrenovación de las Células , Transformación Celular Neoplásica , Citidina Desaminasa/genética , Proteínas de Unión al ADN/genética , Proteínas de Unión al ADN/fisiología , Dioxigenasas , Células Eritroides/citología , Silenciador del Gen , Células Madre Hematopoyéticas/citología , Humanos , Ratones , Células Mieloides/citología , Proteínas Proto-Oncogénicas/genética , Proteínas Proto-Oncogénicas/fisiología
15.
Proc Natl Acad Sci U S A ; 111(50): E5401-10, 2014 Dec 16.
Artículo en Inglés | MEDLINE | ID: mdl-25516983

RESUMEN

Patients with myeloproliferative neoplasms (MPNs) are at significant, cumulative risk of leukemic transformation to acute myeloid leukemia (AML), which is associated with adverse clinical outcome and resistance to standard AML therapies. We performed genomic profiling of post-MPN AML samples; these studies demonstrate somatic tumor protein 53 (TP53) mutations are common in JAK2V617F-mutant, post-MPN AML but not in chronic-phase MPN and lead to clonal dominance of JAK2V617F/TP53-mutant leukemic cells. Consistent with these data, expression of JAK2V617F combined with Tp53 loss led to fully penetrant AML in vivo. JAK2V617F-mutant, Tp53-deficient AML was characterized by an expanded megakaryocyte erythroid progenitor population that was able to propagate the disease in secondary recipients. In vitro studies revealed that post-MPN AML cells were sensitive to decitabine, the JAK1/2 inhibitor ruxolitinib, or the heat shock protein 90 inhibitor 8-(6-iodobenzo[d][1.3]dioxol-5-ylthio)-9-(3-(isopropylamino)propyl)-9H-purine-6-amine (PU-H71). Treatment with ruxolitinib or PU-H71 improved survival of mice engrafted with JAK2V617F-mutant, Tp53-deficient AML, demonstrating therapeutic efficacy for these targeted therapies and providing a rationale for testing these therapies in post-MPN AML.


Asunto(s)
Neoplasias Hematológicas/complicaciones , Janus Quinasa 2/genética , Leucemia Mieloide Aguda/genética , Trastornos Mieloproliferativos/complicaciones , Trastornos Mieloproliferativos/genética , Proteína p53 Supresora de Tumor/genética , Animales , Azacitidina/análogos & derivados , Azacitidina/farmacología , Benzodioxoles/farmacología , Western Blotting , Ensayo de Unidades Formadoras de Colonias , Decitabina , Exoma/genética , Citometría de Flujo , Secuenciación de Nucleótidos de Alto Rendimiento , Humanos , Leucemia Mieloide Aguda/tratamiento farmacológico , Leucemia Mieloide Aguda/etiología , Ratones , Mutación Missense/genética , Nitrilos , Purinas/farmacología , Pirazoles/farmacología , Pirimidinas
16.
J Exp Med ; 221(5)2024 May 06.
Artículo en Inglés | MEDLINE | ID: mdl-38557723

RESUMEN

CD4+ T cells are vital for host defense and immune regulation. However, the fundamental role of CD4 itself remains enigmatic. We report seven patients aged 5-61 years from five families of four ancestries with autosomal recessive CD4 deficiency and a range of infections, including recalcitrant warts and Whipple's disease. All patients are homozygous for rare deleterious CD4 variants impacting expression of the canonical CD4 isoform. A shorter expressed isoform that interacts with LCK, but not HLA class II, is affected by only one variant. All patients lack CD4+ T cells and have increased numbers of TCRαß+CD4-CD8- T cells, which phenotypically and transcriptionally resemble conventional Th cells. Finally, patient CD4-CD8- αß T cells exhibit intact responses to HLA class II-restricted antigens and promote B cell differentiation in vitro. Thus, compensatory development of Th cells enables patients with inherited CD4 deficiency to acquire effective cellular and humoral immunity against an unexpectedly large range of pathogens. Nevertheless, CD4 is indispensable for protective immunity against at least human papillomaviruses and Trophyrema whipplei.


Asunto(s)
Linfocitos T CD4-Positivos , Linfocitos T Colaboradores-Inductores , Humanos , Linfocitos T CD8-positivos , Activación de Linfocitos , Antígenos HLA , Isoformas de Proteínas/metabolismo
17.
NAR Genom Bioinform ; 5(1): lqad030, 2023 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-36968431

RESUMEN

Most cell-cell interactions and crosstalks are mediated by ligand-receptor interactions. The advent of single-cell RNA-sequencing (scRNA-seq) techniques has enabled characterizing tissue heterogeneity at single-cell level. In the past few years, several methods have been developed to study ligand-receptor interactions at cell type level using scRNA-seq data. However, there is still no easy way to query the activity of a specific user-defined signaling pathway in a targeted way or to map the interactions of the same subunit with different ligands as part of different receptor complexes. Here, we present DiSiR, a fast and easy-to-use permutation-based software framework to investigate how individual cells are interacting with each other by analyzing signaling pathways of multi-subunit ligand-activated receptors from scRNA-seq data, not only for available curated databases of ligand-receptor interactions, but also for interactions that are not listed in these databases. We show that, when utilized to infer ligand-receptor interactions from both simulated and real datasets, DiSiR outperforms other well-known permutation-based methods, e.g. CellPhoneDB and ICELLNET. Finally, to demonstrate DiSiR's utility in exploring data and generating biologically relevant hypotheses, we apply it to COVID lung and rheumatoid arthritis (RA) synovium scRNA-seq datasets and highlight potential differences between inflammatory pathways at cell type level for control versus disease samples.

18.
J Exp Med ; 220(2)2023 02 06.
Artículo en Inglés | MEDLINE | ID: mdl-36515678

RESUMEN

Patients with inherited CARMIL2 or CD28 deficiency have defective T cell CD28 signaling, but their immunological and clinical phenotypes remain largely unknown. We show that only one of three CARMIL2 isoforms is produced and functional across leukocyte subsets. Tested mutant CARMIL2 alleles from 89 patients and 52 families impair canonical NF-κB but not AP-1 and NFAT activation in T cells stimulated via CD28. Like CD28-deficient patients, CARMIL2-deficient patients display recalcitrant warts and low blood counts of CD4+ and CD8+ memory T cells and CD4+ TREGs. Unlike CD28-deficient patients, they have low counts of NK cells and memory B cells, and their antibody responses are weak. CARMIL2 deficiency is fully penetrant by the age of 10 yr and is characterized by numerous infections, EBV+ smooth muscle tumors, and mucocutaneous inflammation, including inflammatory bowel disease. Patients with somatic reversions of a mutant allele in CD4+ T cells have milder phenotypes. Our study suggests that CARMIL2 governs immunological pathways beyond CD28.


Asunto(s)
Antígenos CD28 , Proteínas de Microfilamentos , Humanos , Antígenos CD28/metabolismo , Proteínas de Microfilamentos/genética , Mutación/genética , Fenotipo , Linfocitos T CD4-Positivos
19.
Science ; 376(6599): eabm6380, 2022 06 17.
Artículo en Inglés | MEDLINE | ID: mdl-35587511

RESUMEN

The molecular basis of interindividual clinical variability upon infection with Staphylococcus aureus is unclear. We describe patients with haploinsufficiency for the linear deubiquitinase OTULIN, encoded by a gene on chromosome 5p. Patients suffer from episodes of life-threatening necrosis, typically triggered by S. aureus infection. The disorder is phenocopied in patients with the 5p- (Cri-du-Chat) chromosomal deletion syndrome. OTULIN haploinsufficiency causes an accumulation of linear ubiquitin in dermal fibroblasts, but tumor necrosis factor receptor-mediated nuclear factor κB signaling remains intact. Blood leukocyte subsets are unaffected. The OTULIN-dependent accumulation of caveolin-1 in dermal fibroblasts, but not leukocytes, facilitates the cytotoxic damage inflicted by the staphylococcal virulence factor α-toxin. Naturally elicited antibodies against α-toxin contribute to incomplete clinical penetrance. Human OTULIN haploinsufficiency underlies life-threatening staphylococcal disease by disrupting cell-intrinsic immunity to α-toxin in nonleukocytic cells.


Asunto(s)
Toxinas Bacterianas , Síndrome del Maullido del Gato , Endopeptidasas , Haploinsuficiencia , Proteínas Hemolisinas , Infecciones Estafilocócicas , Staphylococcus aureus , Toxinas Bacterianas/inmunología , Síndrome del Maullido del Gato/genética , Síndrome del Maullido del Gato/inmunología , Endopeptidasas/genética , Haploinsuficiencia/genética , Haploinsuficiencia/inmunología , Proteínas Hemolisinas/inmunología , Interacciones Huésped-Patógeno/genética , Interacciones Huésped-Patógeno/inmunología , Humanos , Inmunidad Celular/genética , Necrosis , Infecciones Estafilocócicas/genética , Infecciones Estafilocócicas/inmunología , Infecciones Estafilocócicas/patología
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA