Publications by authors named "Takuma Iwaki"

9 Publications

  • Page 1 of 1

Comprehensive genetic analysis of 57 families with clinically suspected Cornelia de Lange syndrome.

J Hum Genet 2019 Oct 23;64(10):967-978. Epub 2019 Jul 23.

Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Japan.

Cornelia de Lange syndrome (CdLS) is a rare multisystem disorder with specific dysmorphic features. Pathogenic genetic variants encoding cohesion complex subunits and interacting proteins (e.g., NIPBL, SMC1A, SMC3, HDAC8, and RAD21) are the major causes of CdLS. However, there are many clinically diagnosed cases of CdLS without pathogenic variants in these genes. To identify further genetic causes of CdLS, we performed whole-exome sequencing in 57 CdLS families, systematically evaluating both single nucleotides variants (SNVs) and copy number variations (CNVs). We identified pathogenic genetic changes in 36 out of 57 (63.2 %) families, including 32 SNVs and four CNVs. Two known CdLS genes, NIPBL and SMC1A, were mutated in 23 and two cases, respectively. Among the remaining 32 individuals, four genes (ANKRD11, EP300, KMT2A, and SETD5) each harbored a pathogenic variant in a single individual. These variants are known to be involved in CdLS-like. Furthermore, pathogenic CNVs were detected in NIPBL, MED13L, and EHMT1, along with pathogenic SNVs in ZMYND11, MED13L, and PHIP. These three latter genes were involved in diseases other than CdLS and CdLS-like. Systematic clinical evaluation of all patients using a recently proposed clinical scoring system showed that ZMYND11, MED13L, and PHIP abnormality may cause CdLS or CdLS-like.
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http://dx.doi.org/10.1038/s10038-019-0643-zDOI Listing
October 2019

PPARα contributes to protection against metabolic and inflammatory derangements associated with acute kidney injury in experimental sepsis.

Physiol Rep 2019 05;7(10):e14078

Department of Pediatrics, University of Washington School of Medicine, Seattle, Washington.

Sepsis-associated acute kidney injury (AKI) is a significant problem in critically ill children and adults resulting in increased morbidity and mortality. Fundamental mechanisms contributing to sepsis-associated AKI are poorly understood. Previous research has demonstrated that peroxisome proliferator-activated receptor α (PPARα) expression is associated with reduced organ system failure in sepsis. Using an experimental model of polymicrobial sepsis, we demonstrate that mice deficient in PPARα have worse kidney function, which is likely related to reduced fatty acid oxidation and increased inflammation. Ultrastructural evaluation with electron microscopy reveals that the proximal convoluted tubule is specifically injured in septic PPARα deficient mice. In this experimental group, serum metabolomic analysis reveals unanticipated metabolic derangements in tryptophan-kynurenine-NAD and pantothenate pathways. We also show that a subgroup of children with sepsis whose genome-wide expression profiles are characterized by repression of the PPARα signaling pathway has increased incidence of severe AKI. These findings point toward interesting associations between sepsis-associated AKI and PPARα-driven fatty acid metabolism that merit further investigation.
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http://dx.doi.org/10.14814/phy2.14078DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6525329PMC
May 2019

Balloon angioplasty in a pediatric patient with nutcracker syndrome.

Pediatr Int 2019 Mar 18;61(3):300-301. Epub 2019 Mar 18.

Department of Pediatrics, Faculty of Medicine, Kagawa University, Kagawa, Japan.

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http://dx.doi.org/10.1111/ped.13784DOI Listing
March 2019

Clinically diverse phenotypes and genotypes of patients with branchio-oto-renal syndrome.

J Hum Genet 2018 May 2;63(5):647-656. Epub 2018 Mar 2.

Department of Pediatrics, Kobe University Graduate School of Medicine, Kobe, Japan.

Branchio-oto-renal (BOR) syndrome is a rare autosomal dominant disorder characterized by branchiogenic anomalies, hearing loss, and renal anomalies. The aim of this study was to reveal the clinical phenotypes and their causative genes in Japanese BOR patients. Patients clinically diagnosed with BOR syndrome were analyzed by direct sequencing, multiplex ligation-dependent probe amplification (MLPA), array-based comparative genomic hybridization (aCGH), and next-generation sequencing (NGS). We identified the causative genes in 38/51 patients from 26/36 families; EYA1 aberrations were identified in 22 families, SALL1 mutations were identified in two families, and SIX1 mutations and a 22q partial tetrasomy were identified in one family each. All patients identified with causative genes suffered from hearing loss. Second branchial arch anomalies, including a cervical fistula or cyst, preauricular pits, and renal anomalies, were frequently identified (>60%) in patients with EYA1 aberrations. Renal hypodysplasia or unknown-cause renal insufficiency was identified in more than half of patients with EYA1 aberrations. Even within the same family, renal phenotypes often varied substantially. In addition to direct sequencing, MLPA and NGS were useful for the genetic analysis of BOR patients.
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http://dx.doi.org/10.1038/s10038-018-0429-8DOI Listing
May 2018

Burst Suppression in Hypothermia After Cardiac Arrest Because of Drowning Treated with Targeted Temperature Management: A Case Report.

Ther Hypothermia Temp Manag 2017 Jun 16;7(2):107-110. Epub 2016 Dec 16.

1 Emergency Medical Center, Kagawa University Hospital , Miki, Kita, Kagawa, Japan .

Outcomes of cardiac arrest (CA) because of drowning in children are generally poor, but some reports show that cases with post-CA hypothermia because of drowning exhibit good recovery when treated with targeted temperature management (TTM). However, because electroencephalogram (EEG) findings are not reported in those cases, a complete examination of brain damage has not been performed during TTM. Here we report a case of a 15-month-old boy with post-CA hypothermia recovery after treating with TTM, along with EEG findings. The initial clinical and laboratory data and resuscitation history in the current case strongly indicated an unfavorable outcome. However, the return of normal EEG findings after 36 hours postadmission may indicate favorable neurological outcomes. Although reliable evidence has not been established, we recommend maintained mild therapeutic hypothermia using TTM, followed by slow rewarming in patients with post-CA hypothermia because of drowning, based on the observations in the current case and in other studies.
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http://dx.doi.org/10.1089/ther.2016.0036DOI Listing
June 2017

A case of medullomyoblastoma.

Pediatr Int 2011 Jun;53(3):399-402

Department of Pediatrics, Kagawa University, Kagawa, Japan.

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http://dx.doi.org/10.1111/j.1442-200X.2010.03258.xDOI Listing
June 2011

Two families with compound heterozygosity for adenine phosphoribosyltransferase deficiency.

Pediatr Nephrol 2010 Jun 26;25(6):1173-6. Epub 2010 Jan 26.

Department of Pediatrics, Faculty of Medicine, Kagawa University, Mikicho 1750-1, Kitagun, Kagawa 761-0793, Japan.

Adenine phosphoribosyltransferase deficiency is a disorder in which 2,8-dihydroxyadenine (2,8-DHA) crystalluria is caused by a congenital deficiency in the enzyme adenine phosphoribosyltransferase (APRT). In most cases, APRT deficiency is caused by autosomal recessive inheritance of a homozygote of the mutant gene APRT*Q0 or APRT*J, but there are also some cases in which the disorder is caused by the compound heterozygote APRT*Q0 and APRT*J. In the patients described here, brown round crystals were found in their urinary sediment. Crystalluria was the first sign of APRT deficiency, thereafter confirmed by genetic screening for APRT*/Q0 and APRT*. We performed genetic screening for APRT*Q0 and APRT*J in two families and diagnosed three cases of APRT*Q0 /APRT*J compound heterozygote-type APRT deficiency. Genetic screening for APRT*Q0 and APRT*J of family members is effective for early diagnosis and early treatment for family members.
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http://dx.doi.org/10.1007/s00467-009-1430-4DOI Listing
June 2010

Soluble tumor necrosis factor receptor 1 and tissue inhibitor of metalloproteinase-1 in hemolytic uremic syndrome with encephalopathy.

J Neuroimmunol 2008 May 14;196(1-2):147-52. Epub 2008 Apr 14.

Department of Pediatrics, Yamaguchi University Graduate School of Medicine, Ube, Yamaguchi, Japan.

Enterohemorrhagic Escherichia coli (EHEC) induces hemorrhagic colitis and hemolytic uremic syndrome (HUS). Morbidity and mortality are increased in HUS patients with neurologic complications. To determine the pathogenesis of the central nervous system (CNS) involvement in HUS by EHEC, we determined the serum concentrations of interleukin-6 (IL-6), tumor necrosis factor-alpha (TNF-alpha), soluble TNF receptor 1 (sTNFR1), IL-10, interferon-gamma (IFN-gamma), IL-2, IL-4, soluble E-selectin (sE-selectin), matrix metalloproteinase-9 (MMP-9), and tissue inhibitor of metalloproteinase-1 (TIMP-1) during the acute stage in children with HUS with or without CNS involvement. Serum concentrations of IL-6, IL-10, sTNFR1, sE-selectin, MMP-9, and TIMP-1, but not TNF-alpha, IFN-gamma, IL-2, or IL-4, were significantly higher in patients with HUS with encephalopathy compared with controls. Serum IL-6, sTNFR1 and TIMP-1 concentrations were significantly higher in patients with HUS with encephalopathy compared with those with HUS without encephalopathy (P=0.031, P=0.005, and P=0.007, respectively) and those with acute colitis without HUS (P=0.011, P<0.001, and P=0.005, respectively). There were no significant differences in hemoglobin, platelet counts, leukocyte counts, or serum concentrations of IL-10, sE-selectin, MMP-9, aspartate aminotransferase, lactate dehydrogenase, blood urea nitrogen, creatinine, or C-reactive protein between the HUS patients with and without encephalopathy. Our preliminary study suggests that serum IL-6, sTNFR1 and TIMP-1 levels, particularly sTNFR1 and TIMP-1, are important for predicting neurological complications in patients with HUS.
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http://dx.doi.org/10.1016/j.jneuroim.2008.02.012DOI Listing
May 2008

In vitro production of bilirubin photoisomers by light irradiation using neoBLUE.

Pediatr Int 2007 Jun;49(3):318-21

Department of Pediatrics, Kangawa University, Kangawa, Japan.

Background: The light-emitting diode is used as one of the new light sources for phototherapy. NeoBLUE (Atom Medical, Tokyo, Japan) incorporates blue light-emitting diodes for the treatment of neonatal hyperbilirubinemia. The authors compared the in vitro efficacy of neoBLUE with conventional phototherapy devices.

Methods: The three light devices used included neoBLUE and two conventional phototherapy devices with six blue-white (BW) or six green (GR) fluorescent tubes. A bilirubin/human serum albumin solution (15 mg/dL) in 200 x 300 mm elliptical bag was irradiated with each three light device. The average light intensity of neoBLUE, BW and GR was 22.5, 10.2 and 2.6 microW/cm(2) per nm, respectively, for the irradiated area. Bilirubin photoisomers and native bilirubin were measured by high-performance liquid chromatography.

Results: In neoBLUE, BW and GR, the respective production rate of cyclobilirubin was 6.0, 3.7 and 3.9 x 10(-2) mg/dL/min, and the respective (4Z, 15E)-bilirubin/(4Z, 15Z)-bilirubin ratio after irradiation was 0.44, 0.33 and 0.12; the (4Z, 15Z)-bilirubin reduction rate at 20 min after irradiation was 60, 68 and 82%, respectively. The reduction rate of (4Z, 15Z)-bilirubin correlated with the (4Z, 15E)-bilirubin/(4Z, 15Z)-bilirubin ratio.

Conclusion: Phototherapy using the neoBLUE under high level may be clinically more effective than therapy using the conventional light source from the results of the production rate of cyclobilirubin.
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http://dx.doi.org/10.1111/j.1442-200X.2007.02379.xDOI Listing
June 2007