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Individual exome analysis in diagnosis and management of paediatric liver failure of indeterminate aetiology.

ABSTRACT: In children with liver failure, as many as half remain of indeterminate aetiology. This hinders timely consideration of optimal treatment options. We posit that a significant subset of these children harbour known inherited metabolic liver diseases with atypical presentation or novel inborn errors of metabolism. We investigated the utility of whole-exome sequencing in three children with advanced liver disease of indeterminate aetiology.Patient 1 was a 10 year-old female diagnosed with Wilson disease but no detectable ATP7B mutations, and decompensated liver cirrhosis who underwent liver transplant and subsequently developed onset of neurodegenerative disease. Patient 2 was a full-term 2 day-old male with fatal acute liver failure of indeterminate aetiology. Patient 3 was an 8 year-old female with progressive syndromic cholestasis of unknown aetiology since age 3 months.Unbiased whole-exome sequencing of germline DNA revealed homozygous mutations in MPV17 and SERAC1 as the disease causing genes in patient 1 and 2, respectively. This is the first demonstration of SERAC1 loss-of-function associated fatal acute liver failure. Patient 1 expands the phenotypic spectrum of the MPV17-related hepatocerebral mitochondrial DNA depletion syndrome. Patient 3 was found to have syndromic cholestasis due to bi-allelic NOTCH2 mutations.Our findings validate the application of whole-exome sequencing in the diagnosis and management of children with advanced liver disease of indeterminate aetiology, with the potential to enhance optimal selection of treatment options and adequate counselling of families. Moreover, whole-exome sequencing revealed a hitherto unrecognized phenotypic spectrum of inherited metabolic liver diseases.

SUBMITTER: Vilarinho S

PROVIDER: S-EPMC4203706 | biostudies-literature | 2014 Nov

REPOSITORIES: biostudies-literature

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Individual exome analysis in diagnosis and management of paediatric liver failure of indeterminate aetiology.

Vilarinho Sílvia S Choi Murim M Jain Dhanpat D Malhotra Ajay A Kulkarni Sanjay S Pashankar Dinesh D Phatak Uma U Patel Mohini M Bale Allen A Mane Shrikant S Lifton Richard P RP Mistry Pramod K PK

Journal of hepatology 20140710 5

<h4>Background & aims</h4>In children with liver failure, as many as half remain of indeterminate aetiology. This hinders timely consideration of optimal treatment options. We posit that a significant subset of these children harbour known inherited metabolic liver diseases with atypical presentation or novel inborn errors of metabolism. We investigated the utility of whole-exome sequencing in three children with advanced liver disease of indeterminate aetiology.<h4>Methods</h4>Patient 1 was a 1 ...[more]

PMID: 25016221

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Project description:IntroductionThe etiology of acute liver failure (ALF) remains an important prognostic factor. The Acute Liver Failure Study Group recently reported that 150 of 2,718 adult patients with ALF (5.5%) had an indeterminate etiology. Our aim was to use whole exome sequencing to identify genetic variants associated with phenotypic, biochemical, and histologic features among patients with indeterminate ALF.MethodsThis effort has defined a cohort of well-pedigreed patients with indeterminate ALF; DNA samples extracted from whole blood samples were obtained from 26 respective patients with indeterminate ALF. These samples were kept at the Acute Liver Failure Study Group repository at the NIDDK, Bethesda. Whole exome sequencing and bioinformatics analysis were performed at the Mayo Clinic Center of Individualized Medicine in Rochester, MN.ResultsOf the 26 patients, 8 survived spontaneously, 6 died, and 12 underwent a liver transplantation; all those transplanted were alive at 21 days after enrollment in the study. Twenty-two of the 26 patients presented as ALF. We found 12 variants associated with 11 genes. The most common variant was rs4940595 in the SERPINB11 gene which was found in 23 of the 26 patients. This variant had a stop codon; no reports of disorders have been associated with this variant. The next most commonly found variant was rs1135840 in the CYP2D6 gene; this mutation is a missense_variant and has been reported to be associated with hepatotoxicity of antituberculous therapy. None of our patients were receiving this therapy. We also found a significant asymmetric distribution of rs1800754 of the CYP2D7 gene and rs1135840 of the CYP2D6 gene between patients who survived spontaneously (75%) and those who died or underwent liver transplantation (30.5% and 25%, respectively).DiscussionWe found 12 variants of 11 genes significantly associated with ALF among adults with indeterminate etiology. We also found a significant asymmetric distribution of 2 variants belonging to the CYP2D7 and CYP2D6 genes, respectively, between those who survived spontaneously and those who died or underwent liver transplantation. The 2 most common variants, rs4940595 and rs1135840, of the SERPINB11 and CYP2D6 genes, respectively, found in our patients with ALF have been described as potentially important in the adaptive response combating the emergence of infectious diseases and associated with hepatotoxicity of antituberculous therapy, respectively. Our findings need to be expanded to include more patients with indeterminate ALF as well as viral, drug toxicity, and autoimmune etiologies to determine whether our findings are associated with the specific etiology, indeterminate, or with the overall ALF syndrome itself.

Project description:Many patients with indeterminate pediatric acute liver failure (PALF) have evidence of T-cell driven immune injury; however, the precise inflammatory pathways are not well defined. We have characterized the hepatic cytokine and transcriptional signatures of patients with PALF. A retrospective review was performed on 22 children presenting with indeterminate (IND-PALF; n = 17) or other known diagnoses (DX-PALF; n = 6) with available archived liver tissue. Specimens were stained for clusters of differentiation 8 (CD8) T cells and scored as dense, moderate, or minimal. Measurement of immune analytes and RNA sequencing (RNA-seq) was performed on whole-liver tissue. Immune analyte data were analyzed by principal component analysis, and RNA-seq was analyzed by unsupervised hierarchical clustering, differential gene expression, and gene-set enrichment analysis. Most patients with IND-PALF (94%) had dense/moderate CD8 staining and were characterized by Th1 immune analytes including tumor necrosis factor α, interferon γ (IFN-γ), interleukin (IL) 1β, IL-12, C-X-C motif chemokine ligand (CXCL) 9, and CXCL12. Transcriptional analyses identified two transcriptional PALF phenotypes. Most patients in group 1 (91%) had IND-PALF and dense/moderate CD8 staining. This group was characterized by increased expression of genes and cell subset-specific signatures related to innate inflammation, T-cell activation, and antigen stimulation. Group 1 expressed significantly higher levels of gene signatures for regulatory T cells, macrophages, Th1 cells, T effector memory cells, cytotoxic T cells, and activated dendritic cells (adjusted P < 0.05). In contrast, patients in group 2 exhibited increased expression for genes involved in metabolic processes. Conclusion: Patients with IND-PALF have evidence of a Th1-mediated inflammatory response driven by IFN-γ. Transcriptional analyses suggest that a complex immune network may regulate an immune-driven PALF phenotype with less evidence of metabolic processes. These findings provide insight into mechanisms of hepatic injury in PALF, areas for future research, and potential therapeutic targets.

Project description:Background and Aims: Many patients with indeterminate pediatric acute liver failure (PALF) have evidence of T-cell driven immune injury, however the precise inflammatory pathways have not been well defined. We have thus characterized the hepatic cytokine and transcriptional signatures of PALF patients. Approach and Results: Retrospective review was performed on 22 children presenting with indeterminate (IND-PALF; n=17) or other diagnoses (DX-PALF; n=6) with available archived liver tissue. Specimens were stained for CD8 T-cells and scored as dense, moderate, or minimal. Measurement of immune analytes and RNA-sequencing (RNA-seq) were performed on whole liver tissue. Immune analyte data was analyzed by principal component analysis, and RNA-seq was analyzed by unsupervised hierarchical clustering, differential gene expression, and gene set enrichment analysis. Most IND-PALF patients (94%) had dense/moderate CD8 staining and were characterized by Th1 immune analytes including TNFα, IFNγ, IL-1β, IL-12, CXCL9, and CXCL12. Transcriptional analyses identified 2 transcriptional PALF phenotypes. Most patients in Group 1 (91%) had IND-PALF and dense/moderate CD8 staining. This group was characterized by increased expression of genes and cell-subset specific signatures related to innate inflammation, T-cell activation, and antigen stimulation. Group 1 also expressed significantly higher levels of gene signatures for T-regulatory cells, macrophages, Th1 cells, T effector memory cells, cytotoxic T-cells, and activated dendritic cells (p-adj <0.05). In contrast, patients in Group 2 exhibited increased expression for genes involved in metabolic processes. Conclusions: IND-PALF patients have evidence of a Th1 mediated inflammatory response driven by IFNγ. Transcriptional analyses suggest a complex immune network may regulate an immune-driven PALF phenotype with less evidence of metabolic processes. These findings provide novel insight into mechanisms of hepatic injury in PALF, areas for future research, and potential therapeutic targets.

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Individual exome analysis in diagnosis and management of paediatric liver failure of indeterminate aetiology.

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Individual exome analysis in diagnosis and management of paediatric liver failure of indeterminate aetiology.

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