Clinical utility of rapid whole genome sequencing in neonatal patients receiving extracorporeal membrane oxygenation (ECMO)
Amin MD, Wigby K, Suttner D, Niemi AK, Guidugli L, Carroll J. Clinical utility of rapid whole genome sequencing in neonatal patients receiving extracorporeal membrane oxygenation (ECMO). J Perinatol. 2024 Nov 27
J Perinatol. 2024 Nov 27. doi: 10.1038/s41372-024-02181-1. Online ahead of print.
ABSTRACT
OBJECTIVE: The objective of this study is to describe the impact of rapid and ultra-rapid whole genome sequencing (rWGS/urWGS) on the care of neonatal intensive care (NICU) patients who require extracorporeal membrane oxygenation (ECMO).
STUDY DESIGN: This is a retrospective cohort study at a single-center NICU in a tertiary children’s hospital. The study population includes NICU patients treated with ECMO from May 2017 to September 2023. Patients were evaluated for whether whole genome was completed, speed of testing (rapid vs. ultra-rapid), diagnostic rate, and clinical utility.
RESULT: Twenty-six (72%) patients had rWGS/urWGS. A diagnosis associated with the patient’s phenotype was made in 12 patients (46%). A change in clinical management was made due to rWGS/urWGS in 10 patients (38%) including avoidance of imaging studies, decisions regarding goals of care, and screening studies.
CONCLUSION: This study demonstrates a high diagnostic rate and clinical utility of rWGS/urWGS for NICU patients requiring ECMO.
PMID:
39604575 | DOI:
10.1038/s41372-024-02181-1
November 27, 2024
rWGS
The ClinGen Syndromic Disorders Gene Curation Expert Panel: Assessing the Clinical Validity of 111 Gene-Disease Relationships
Broeren E, Gitau V, Byrne A, Ajuyah P, Balzotti M, Berg J, Bluske K, Bowen BM, Brown MP, Buchanan A, Burns B, Burns NJ, Chandrasekhar A, Chawla A, Chong J, Chopra M, Clause A, DiStefano M, DiTroia S, Elnagheeb M, Girod A, Goel H, Golden-Grant K, Ha T, Hamosh A, Huang J, Hughes M, Jamuar S, Kam S, Kesari A, Koh AL, Lassiter R, Leigh S, Lemire G, Lim JY, Malhotra A, McCurry H, Milewski B, Moosa S, Murray S, Owens E, Palmer E, Palus B, Patel M, Rajkumar R, Ratliff J, Raymond FL, Assis BDRR, Sajan S, Schlachetzki Z, Schmidt S, Stark Z, Strom S, Taylor J, Thaxton C, Thrush D, Toro S, Tshering K, Vasilevsky N, Wayburn B, Webb R, O’Donnell-Luria A, Coffey AJ. The ClinGen Syndromic Disorders Gene Curation Expert Panel: Assessing the Clinical Validity of 111 Gene-Disease Relationships. medRxiv [Preprint]. 2024 Nov 20:2024
medRxiv [Preprint]. 2024 Nov 20:2024.11.19.24317561. doi: 10.1101/2024.11.19.24317561.
ABSTRACT
PURPOSE: The Clinical Genome Resource (ClinGen) Gene Curation Expert Panels (GCEPs) have historically focused on specific organ systems or phenotypes; thus, the ClinGen Syndromic Disorders GCEP (SD-GCEP) was formed to address an unmet need.
METHODS: The SD-GCEP applied ClinGen’s framework to evaluate the clinical validity of genes associated with rare syndromic disorders. 111 Gene-Disease Relationships (GDRs) associated with 100 genes spanning the clinical spectrum of syndromic disorders were curated.
RESULTS: From April 2020 through March 2024, 38 precurations were performed on genes with multiple disease relationships and were reviewed to determine if the disorders were part of a spectrum or distinct entities. 14 genes were lumped into a single disease entity and 24 were split into separate entities, of which 11 were curated by the SD-GCEP. A full review of 111 GDRs for 100 genes followed, with 78 classified as Definitive, 9 as Strong, 15 as Moderate, and 9 as Limited highlighting where further data are needed. All diseases involved two or more organ systems, while the majority (88/111 GDRs, 79.2%) had five or more organ systems affected.
CONCLUSION: The SD-GCEP addresses a critical gap in gene curation efforts, enabling inclusion of genes for syndromic disorders in clinical testing and contributing to keeping pace with the rapid discovery of new genetic syndromes.
PMID:
39606380 | PMC:
PMC11601709 | DOI:
10.1101/2024.11.19.24317561
November 27, 2024
Neurogenomics
Consolidating the Role of Mutated ATP2B2 in Neurodevelopmental and Cerebellar Pathologies
Stehr AM, Lenberg J, Friedman J, Dobbelaere D, Imbard A, Levy J, Donoghue S, Derive N, Stoeva R, Gueguen P, Zech M. Consolidating the Role of Mutated ATP2B2 in Neurodevelopmental and Cerebellar Pathologies. Clin Genet. 2024
Clin Genet. 2024 Oct 5. doi: 10.1111/cge.14622. Online ahead of print.
ABSTRACT
Plasma membrane calcium ATPases (PMCAs) encoded by ATP2B genes have been implicated in Mendelian diseases with ataxia, dystonia, and intellectual disability. Work to date has shown that ATP2B2 (encoding PMCA2) is required for synaptic function and Purkinje-cell integrity in the cerebellum. A recent case series has linked ATP2B2 to a novel entity, characterized by neurodevelopmental and movement phenotypes, in only seven individuals. We called for collaboration to collect five unpublished families affected by the new rare ATP2B2-related condition. Exome-/genome sequencing-identified genotypes included four likely pathogenic/pathogenic heterozygous de novo missense variants and one dominantly inherited end-truncating frameshift allele. The six affected individuals shared features with the described patients including developmental delay, cognitive disturbances, epilepsy, autistic traits, and motor disorders. Striking cerebellar atrophy was observed in one affected individual. In association with hearing loss and movement abnormalities, we report a recurrent p.(Glu457Lys) substitution, previously documented in a neurologically impaired ATP2B2 mouse mutant. Our study further delineates the mutational spectrum and presentation of a human syndrome caused by ATP2B2 variants, confirming the importance of PMCA2 in neurotypical and cerebellar development.
PMID:
39367743 | DOI:
10.1111/cge.14622
November 20, 2024
Neurogenomics
Biallelic variants in ERLIN1: a series of 13 individuals with spastic paraparesis
Cogan G, Zaki MS, Issa M, Keren B, Guillaud-Bataille M, Renaldo F, Isapof A, Lallemant P, Stevanin G, Guillot-Noel L, Courtin T, Buratti J, Freihuber C, Gleeson JG, Howarth R, Durr A, de Sainte Agathe JM, Mignot C. Biallelic variants in ERLIN1: a series of 13 individuals with spastic paraparesis. Hum Genet. 2024 Nov;14
Abstract
Biallelic variants in the ERLIN1 gene were recently reported as the cause of two motor neuron degeneration diseases, SPG62 and a recessive form of amyotrophic lateral sclerosis. However, only 12 individuals from five pedigrees have been identified so far. Thus, the description of the disease remains limited. Following the discovery of a homozygous pathogenic variant in a girl with SPG62, presenting with intellectual disability, and epilepsy, we gathered the largest series of SPG62 cases reported so far (13 individuals) to better understand the phenotype associated with ERLIN1. We collected molecular and clinical data for 13 individuals from six families with ERLIN1 biallelic variants. We performed RNA-seq analyses to characterize intronic variants and used Alphafold and a transcripts database to characterize the molecular consequences of the variants. We identified three new variants suspected to alter the bell-shaped ring formed by the ERLIN1/ERLIN2 complex. Affected individuals had childhood-onset paraparesis with slow progression. Six individuals presented with gait ataxia and three had superficial sensory loss. Aside from our proband, none had intellectual disability or epilepsy. Biallelic pathogenic ERLIN1 variants induce a rare, predominantly pure, spastic paraparesis, with possible cerebellar and peripheral nerve involvement.
PMID: 39367212 | DOI: 10.1007/s00439-024-02702-0
November 14, 2024
Neurogenomics
A framework for N-of-1 trials of individualized gene-targeted therapies for genetic diseases
Kim-McManus O, Gleeson JG, Mignon L, Smith Fine A, Yan W, Nolen N, Demarest S, Berry-Kravis E, Finkel R, Leonard S, Finlayson S, Augustine E, Lyon GJ, Schule R, Yu T. A framework for N-of-1 trials of individualized gene-targeted therapies for genetic diseases. Nat Commun. 2024 Nov 12;15(1):9802. doi: 10.1038/s41467-024-54077-5. PMID: 39532857; PMCID: PMC11557703.
Nat Commun. 2024 Nov 12;15(1):9802. doi: 10.1038/s41467-024-54077-5.
ABSTRACT
Individualized genetic therapies-medicines that precisely target a genetic variant that may only be found in a small number of individuals, as few as only one-offer promise for addressing unmet needs in genetic disease, but present unique challenges for trial design. By nature these new individualized medicines require testing in individualized N-of-1 trials. Here, we provide a framework for maintaining scientific rigor in N-of-1 trials. Building upon best practices from traditional clinical trial design, recent guidance from the United States Food and Drug Administration, and our own clinical research experience, we suggest key considerations including comprehensive baseline natural history, selection of appropriate clinical outcome assessments (COAs) individualized to the patient genotype-phenotype for safety and efficacy assessment over time, and specific statistical considerations. Standardization of N-of-1 trial designs in this fashion will maximize efficient learning from this next generation of targeted individualized therapeutics.
PMID:
39532857 | DOI:
10.1038/s41467-024-54077-5
November 12, 2024
rWGS Efficacy
Biallelic variants in GTF3C3 result in an autosomal recessive disorder with intellectual disability
De Hayr L, Blok LER, Dias KR, Long J, Begemann A, Moir RD, Willis IM, Mocera M, Siegel G, Steindl K, Evans CA, Zhu Y, Zhang F, Field M, Ma A, Adès L, Josephi-Taylor S, Pfundt R, Zaki MS, Tomoum H, Gregor A, Laube J, Reis A, Maddirevula S, Hashem MO, Zweier M, Alkuraya FS, Maroofian R, Buckley MF, Gleeson JG, Zweier C, Coll-Tané M, Koolen DA, Rauch A, Roscioli T, Schenck A, Harvey RJ. Biallelic variants in GTF3C3 result in an autosomal recessive disorder with intellectual disability. Genet Med. 2024 Nov 7
Genet Med. 2024 Nov 7:101253. doi: 10.1016/j.gim.2024.101253. Online ahead of print.
ABSTRACT
PURPOSE: This study details a novel syndromic form of autosomal recessive intellectual disability resulting from recessive variants in GTF3C3, encoding a key component of the DNA-binding transcription factor IIIC, which has a conserved role in RNA polymerase III-mediated transcription.
METHODS: Exome sequencing, minigene analysis, molecular modeling, RNA polymerase III reporter gene assays, and Drosophila knockdown models were utilized to characterize GTF3C3 variants.
RESULTS: Twelve affected individuals from 7 unrelated families were identified with homozygous or compound heterozygous missense variants in GTF3C3 including c.503C>T p.(Ala168Val), c.1268T>C p.(Leu423Pro), c.1436A>G p.(Tyr479Cys), c.2419C>T p.(Arg807Cys), and c.2420G>A p.(Arg807His). The cohort presented with intellectual disability, variable nonfamilial facial features, motor impairments, seizures, and cerebellar/corpus callosum malformations. Consistent with disruptions in intra- and intermolecular interactions observed in molecular modeling, RNA polymerase III reporter assays confirmed that the majority of missense variants resulted in a loss of function. Minigene analysis of the recurrent c.503C>T p.(Ala168Val) variant confirmed the introduction of a cryptic donor site into exon 4, resulting in mRNA missplicing. Consistent with the clinical features of this cohort, neuronal loss of Gtf3c3 in Drosophila induced seizure-like behavior, motor impairment, and learning deficits.
CONCLUSION: These findings confirm that GTF3C3 variants result in an autosomal recessive form of syndromic intellectual disability.
PMID:
39636576 | DOI:
10.1016/j.gim.2024.101253
November 7, 2024
Genetic Neurologic Disease
Early Newborn Metabolic Patterning and Sudden Infant Death Syndrome
Oltman SP, Rogers EE, Baer RJ, Amsalu R, Bandoli G, Chambers CD, Cho H, Dagle JM, Karvonen KL, Kingsmore SF, McKenzie-Sampson S, Momany A, Ontiveros E, Protopsaltis LD, Rand L, Kobayashi ES, Steurer MA, Ryckman KK, Jelliffe-Pawlowski LL. Early Newborn Metabolic Patterning and Sudden Infant Death Syndrome. JAMA Pediatr. 2024 Nov 1
Abstract
Importance: Sudden infant death syndrome (SIDS) is a major cause of infant death in the US. Previous research suggests that inborn errors of metabolism may contribute to SIDS, yet the relationship between SIDS and biomarkers of metabolism remains unclear.
Objective: To evaluate and model the association between routinely measured newborn metabolic markers and SIDS in combination with established risk factors for SIDS.
Design, setting, and participants: This was a case-control study nested within a retrospective cohort using data from the California Office of Statewide Health Planning and Development and the California Department of Public Health. The study population included infants born in California between 2005 and 2011 with full metabolic data collected as part of routine newborn screening (NBS). SIDS cases were matched to controls at a ratio of 1:4 by gestational age and birth weight z score. Matched data were split into training (2/3) and testing (1/3) subsets. Data were analyzed from January 2005 to December 2011.
Exposures: Metabolites measured by NBS and established risk factors for SIDS.
Main outcomes and measures: The primary outcome was SIDS. Logistic regression was used to evaluate the association between metabolic markers combined with known risk factors and SIDS.
Results: Of 2 276 578 eligible infants, 354 SIDS (0.016%) cases (mean [SD] gestational age, 38.3 [2.3] weeks; 220 male [62.1%]) and 1416 controls (mean [SD] gestational age, 38.3 [2.3] weeks; 723 male [51.1%]) were identified. In multivariable analysis, 14 NBS metabolites were significantly associated with SIDS in a univariate analysis: 17-hydroxyprogesterone, alanine, methionine, proline, tyrosine, valine, free carnitine, acetyl-L-carnitine, malonyl carnitine, glutarylcarnitine, lauroyl-L-carnitine, dodecenoylcarnitine, 3-hydroxytetradecanoylcarnitine, and linoleoylcarnitine. The area under the receiver operating characteristic curve for a 14-marker SIDS model, which included 8 metabolites, was 0.75 (95% CI, 0.72-0.79) in the training set and was 0.70 (95% CI, 0.65-0.76) in the test set. Of 32 infants in the test set with model-predicted probability greater than 0.5, a total of 20 (62.5%) had SIDS. These infants had 14.4 times the odds (95% CI, 6.0-34.5) of having SIDS compared with those with a model-predicted probability less than 0.1.
Conclusions and relevance: Results from this case-control study showed an association between aberrant metabolic analytes at birth and SIDS. These findings suggest that we may be able to identify infants at increased risk for SIDS soon after birth, which could inform further mechanistic research and clinical efforts focused on monitoring and prevention.
PMID: 39250160 | DOI: 10.1001/jamapediatrics.2024.3033
November 1, 2024
Infant Mortality
Treating the Untreatable: Antisense Oligonucleotides as an Individualized Therapy for Rare Genetic Kidney Disease
Tekendo-Ngongang C, Gleeson JG, Mignon L. Treating the Untreatable: Antisense Oligonucleotides as an Individualized Therapy for Rare Genetic Kidney Diseases. J Am Soc Nephrol. 2024 Dec 1
October 30, 2024
The Face and Features of RNU4-2: A New, Common, Recognizable, Yet Hidden Neurodevelopmental Disorder
Barbour K, Bainbridge MN, Wigby K, Besterman AD, Chuang NA, Tobin LE, Del Campo M, Lenberg J, Bird LM, Friedman J. The Face and Features of RNU4-2: A New, Common, Recognizable, Yet Hidden Neurodevelopmental Disorder. Pediatr Neurol. 2024 Sep 21;161:188-193. doi: 10.1016/j.pediatrneurol.2024.09.015
Pediatr Neurol. 2024 Sep 21;161:188-193. doi: 10.1016/j.pediatrneurol.2024.09.015. Online ahead of print.
ABSTRACT
BACKGROUND: RNU4-2 is a newly identified, noncoding gene responsible for a significant proportion of individuals with neurodevelopmental disorders (NDDs). Diagnosis is hampered by the inability of commonly employed clinical testing methods, including exome sequencing and currently formulated multigene panels, to detect variants in the noncoding region. The relatively high prevalence of this condition, predicted to affect thousands of undiagnosed children with NDDs, makes it even more relevant to have better tools to facilitate diagnosis. The initial report of the gene-disease association outlined aggregate phenotypic features but lacked detailed patient evaluations, potentially under-reporting phenotypic features and failing to highlight unique aspects. We aimed to identify individuals with RNU4-2 gene variants to deeply phenotype the clinical profile. We sought to define key features that may suggest the diagnosis, to highlight individuals for whom specialized testing, able to detect noncoding region variants, may be indicated.
METHODS: We reviewed genomic data from 6,734 individuals, identifying five with recurrent de novo RNU4-2 (n.64_65insT) variants. We clinically evaluated four. Findings were compared with those previously reported.
RESULTS: We identify common clinical features, a distinctive dysmorphic facial pattern, and shared imaging abnormalities. We describe novel aspects including longitudinal trajectory and treatment response.
CONCLUSIONS: Enhanced recognition of the RNU4-2 (n.64_65insT-common variant) phenotype, particularly the dysmorphic facial features, will facilitate earlier diagnosis. Distinctive characteristics will guide the selection of patients for testing able to detect RNU4-2 variants: genome sequencing or targeted gene testing. Furthermore, health and research systems may identify undiagnosed patients by querying databases for individuals exhibiting the traits described herein.
PMID:
39423747 | DOI:
10.1016/j.pediatrneurol.2024.09.015
October 30, 2024
Neurogenomics
Monoallelic loss-of-function variants in GSK3B lead to autism and developmental delay
Tan S, Zhang Q, Zhan R, Luo S, Han Y, Yu B, Muss C, Pingault V, Marlin S, Delahaye A, Peters S, Perne C, Kreiß M, Spataro N, Trujillo-Quintero JP, Racine C, Tran-Mau-Them F, Phornphutkul C, Besterman AD, Martinez J, Wang X, Tian X, Srivastava S, Urion DK, Madden JA, Saif HA, Morrow MM, Begtrup A, Li X, Jurgensmeyer S, Leahy P, Zhou S, Li F, Hu Z, Tan J, Xia K, Guo H. Monoallelic loss-of-function variants in GSK3B lead to autism and developmental delay. Mol Psychiatry. 2024 Oct 29
Mol Psychiatry. 2024 Oct 29. doi: 10.1038/s41380-024-02806-z. Online ahead of print.
ABSTRACT
De novo variants adjacent to the canonical splicing sites or in the well-defined splicing-related regions are more likely to impair splicing but remain under-investigated in autism spectrum disorder (ASD). By analyzing large, recent ASD genome sequencing cohorts, we find a significant burden of de novo potential splicing-disrupting variants (PSDVs) in 5048 probands compared to 4090 unaffected siblings. We identified 55 genes with recurrent de novo PSDVs that were highly intolerant to variation. Forty-six of these genes have not been strongly implicated in ASD or other neurodevelopmental disorders previously, including GSK3B. Through international, multicenter collaborations, we assembled genotype and phenotype data for 15 individuals with GSK3B variants and identified common phenotypes including developmental delay, ASD, sleeping disturbance, and aggressive behavior. Using available single-cell transcriptomic data, we show that GSK3B is enriched in dorsal progenitors and intermediate forms of excitatory neurons in the developing brain. We showed that Gsk3b knockdown in mouse excitatory neurons interferes with dendrite arborization and spine maturation which could not be rescued by de novo missense variants identified from affected individuals. In summary, our findings suggest that PSDVs may play an important role in the genetic etiology of ASD and allow for the prioritization of new ASD candidate genes. Importantly, we show that genetic variation resulting in GSK3B loss-of-function can lead to a neurodevelopmental disorder with core features of ASD and developmental delay.
PMID:
39472663 | DOI:
10.1038/s41380-024-02806-z
October 29, 2024
Genetic Neurologic Disease
