A healthy neonate born at the third pregnancy of a woman with ornithine carbamoyltransferase deficiency under multidisciplinary management / 中华围产医学杂志

We reported a women with omithine carbamoyltransferase deficiency who delivered a healthy boy after two pregnancies with adverse outcome with the help of a multidiscipline team.The woman was admitted to Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine with an acute prenatal hyperammonemic episode at 28 gestational weeks of her first pregnancy in 2013 and was diagnosed with ornithine transcarbamylase deficiency.Her hyperammonemic complications were controlled under a well-planned multidisciplinary management including a low-protein diet and appropriate medications assisting nitrogen removal.A boy was delivered by cesarean section at 32 weeks of gestation but died three days later.Mutation analysis revealed a hemizygous c.583G＞A (G195R) mutation in the neonatal omithine carbamyltransferase gene and his mother was a heterozygous carrier with the same mutation.Two years later in 2015,the patient was pregnant spontaneously.However,she received an induced abortion at 21 weeks of gestation because amniocentesis and DNA analysis showed that the male fetus had the same omithine transcarbamylase gene mutation.The index pregnancy was assisted by in vitro fertilization-embryo transfer and preimplantation genetic diagnosis in 2017 and the woman delivered a healthy boy with the management ofa multidisciplinary team.

Clinical research of two cases of late-onset ornithine carbamoyltransferase deficiency / 中华神经科杂志

Objective To explore the clinical characteristics of late-onset ornithine carbamoyltransferase deficiency (OTCD) in order to improve the clinicians' understanding of this disease.Methods The clinical,therapeutic and follow-up data of two patients with late-onset OTCD diagnosed in the Department of Neurology,Qilu Hospital of Shandong University from November 2017 to February 2018 were collected and analyzed.Results Case 1 is a 17-year-old male who was admitted into Qilu Hospital with recurrent dizziness and vomiting for 4 months,sudden mental abnormality and convulsion for 3 days.The liver dysfunction,respiratory alkalosis and hyperammonemia (434 μmol/L) had been found before his admission.His blood ammonia fluctuated obviously from 180 μ mol/L to 2998 μmol/L,though he was given hemodialysis and arginine infusion,and died on the fourth day after admission.Case 2 is a 15-year-old male,complained with recurrent dizziness,vomiting,bluntness and somnolence for 20 days.He was found with hyperammonemia (600 μmol/L) and liver dsyfunction in a local hospital.He was getting better after intravenous administration of arginine and liver protective drugs.After admission,the blood ammonia,liver function and amino acids,acylcarnitine profiling in dried blood spots,and organic acid analysis in urine were normal,and he has not recurred since restriction of protein diet.Brain magnetic resonane imaging of both patients showed cytotoxic edema of bilateral frontal lobe and insular cortex,and their genetic detection both showed c.119G＞A(p.R40H) hemizygous pathogenic mutation of OTC gene inherited from their respective mothers.Conclusion Unexplained hyperammonemia and acute encephalopathy with insular and frontal cortical involvement should be on the alert to the urea cycle disorders,especially OTCD.Early diagnosis and reasonable treatment are the key to changing the prognosis.

Déficit de ornitina transcarbamilasa: Caso clínico / Ornithine carbamoyltransferase deficiency: A clinical case

Los trastornos del ciclo de la urea suponen hasta el 60% de las hiperamoniernias graves neonatales. La base de los trastornos de este ciclo deriva en el déficit de una de sus enzimas. El déficit de la enzima ornitina transcarbamilasa es el más frecuente. Su pronóstico dependerá del grado de deficiencia enzimàtica, la edad, la precocidad del diagnóstico e inicio del tratamiento. Presentamos el caso de un adolescente que, a partir de un cuadro de parálisis facial periférica tratado con prednisona, presentó agravamiento de su estado general y falleció a los pocos días. Las cifras elevadas de amoniaco en sangre hicieron sospechar tardíamente de una alteración congénita del ciclo de la urea, que fue confirmada por su estudio genético post mortem. Se estudiaron los familiares y se asesoró a los afectos y portadores. Reflexionamos sobre la importancia de los programas de cribado neonatal y la posibilidad de aplicarlos en la detección de los errores congénitos del metabolismo.

Disorders of urea cycle account for up to 60% of severe neonatal hyperamoniemias. The base of this cycle disorders results in a deficit of its enzymes. Deficiency of the enzyme ornithine transcarbamylase is the most frequently detected. The prognosis depends on the degree of enzyme deficiency, age, early diagnosis and initiation of treatment. We report the case of a teenager who was treated with prednisone because of a peripheral facial palsy. He showed a progressive worsening and died a few days later. The high levels of ammonia made suspect a congenital disorder of urea cycle. The postmortem genetic study confirmed it. We studied the family and advised carriers. We reflect about the importance of the neonatal screening programs and their applicability for detection of inborn errors of metabolism.

Multidisciplinary perinatal management of a woman and her baby with ornithine transcarbamylase deficiency / 中华围产医学杂志

Objective To investigate the clinical features and gene mutation of a newborn with neonatal-onset ornithine transcarbamylase deficiency (OTCD) and report the multidisciplinary perinatal management of the mother with late-onset OTCD.Methods The clinical features,biochemical data and the treatment of a newborn boy with OTCD and his mother admitted by Xin Hua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine in April,2013,were collected.The ornithine transcarbamylase (OTC) gene in the family was analyzed.Results Serum ammonium in the male newborn gradually increased to 1 020 μ mol/L at 48 h after birth.His blood amino acids level and urine organic acid level showed a pattern indicative of OTCD [blood arginine (97.43 μ mol/L,reference 1.00-25.00 μ mol/L),citrulline (27.43 μ mol/L,reference 4.00-30.00 μ mol/L),ornithine (161.66 μ mol/L,reference 10.00-120.00 μ mol/L) and methionine (70.45 μ mol/L,reference 10.00-50.00 μ mol/L); urine uracil (67.11 μ mol/mol Crea,reference 0.00-7.00 μ mol/mol Crea) and orotic acid (1 372.66 μ mol/mol Crea,reference 0.00-1.50 μ mol/mol Crea)].DNA studies revealed a c.583G ＞ A (G195R) homozygous mutation of the OTC gene.His mother was heterozygous for OTCD and developed acute hyperammonemia during pregnancy.Her blood showed a normal-leveled arginine (8.44 μ mol/L,reference 1.50-25.00 μ mol/L),a normal-leveled citrulline(8.41 μ mol/L,reference 7.00-35.00 μ mol/L),an elevated glutamate(279.15 μ mol/L,reference 45.00-200.00 μ mol/L).Her urine uracil (51.55 μ mol/mol Crea,reference 0.00-7.00 μ mol/mol Crea) and orotic acid (38.75 μ mol/mol Crea,reference 0.00-1.50 μ mol/mol) were elevated.Successful management of her prenatal and postpartum blood ammonia level was achieved after administration of pharmacologic nitrogen scavengers and protein limitation.DNA studies revealed a c.583G ＞ A (G195R) heterozygous mutation in the newborn's mother and grandmother.Conclusions General management on pregnant OTCD women is effective.Male newborn patients often have a poor prognosis.