Deficiencia nutricional de vitamina B12 en la infancia como causa de encefalopatía / Nutritional deficiency of vitamin B12 in infancy as a cause of encephalopathy

No disponible

No disponible

[Clinical findings and mutational spectrum in Venezuelan patients with delayed diagnosis of phenylketonuria]. / Hallazgos clínicos y espectro mutacional en pacientes venezolanos con diagnóstico tardío de fenilcetonuria.

INTRODUCTION: Massive neonatal screening for phenylketonuria (PKU) began in developed countries in 1963, and eventually disappeared as a cause of mental retardation. Yet, this is not the case in most developing countries. AIM: To describe the phenotype and the genotype of PKU patients with a delayed diagnosis in order to draw attention to the importance of neonatal studies and molecular diagnosis. PATIENTS AND METHODS: Clinical data were collected from five unrelated patients by means of a medical assessment. The molecular study was conducted using the DGGE, sequencing and/or restriction analysis techniques to search for mutations in the PAH gene. RESULTS. Owing to the delayed diagnosis all the patients presented severe clinical manifestations, such as psychomotor retardation, atypical behaviours and language disorders. Four of them presented epilepsy and there were two cases of microcephaly. The phenotype was as expected, given the genotype. Seven different mutations were detected in the 10 alleles that were studied. The IVS10nt +5 g>t mutation was the most frequent, followed by the Venezuelan mutation S349L. Furthermore, two patients presented mutated proteins with residual activity, and good results were obtained using BH4 therapy. CONCLUSIONS: In our country, as in most developing countries, PKU neonatal studies are performed but the programme does not cover the whole neonatal population. In this work, we want to stress the importance of neonatal studies in the welfare of children, as well as the use of molecular diagnosis to improve the therapeutic orientation and genetic counselling of the families involved.

Hallazgos clínicos y espectro mutacional en pacientes venezolanos con diagnóstico tardío de fenilcetonuria / Clincial findings and mutational spectrum in Venezuelan patients with delayed diagnosis of phenylketonuria

Introducción. En 1963 comenzó el cribado neonatal masivo de fenilcetonuria (PKU) en países desarrollados, queacabó desapareciendo como causa de retraso mental. Sin embargo, éste no es el caso en la mayoría de los países en vías de desarrollo. Objetivo. Describir el fenotipo y el genotipo de pacientes con diagnóstico tardío de PKU, con el fin de resaltar la importancia del estudio neonatal y el diagnóstico molecular. Pacientes y métodos. Se recogieron datos clínicos de cinco pacientes no relacionados mediante evaluación médica. El estudio molecular se realizó empleando las técnicas de DGGE, secuenciación y/o análisis de restricción para la búsqueda de mutaciones en el gen PAH. Resultados. Todos los pacientes presentaronmanifestaciones clínicas graves debidas al diagnóstico tardío, como retraso psicomotor, conductas atípicas y trastornos del lenguaje. Cuatro de ellos presentaron epilepsia y dos, microcefalia. El fenotipo fue el esperado de acuerdo con el genotipo. Se detectaron siete mutaciones diferentes en los 10 alelos estudiados. La mutación IVS10nt+5g>t fue la más frecuente,seguida de la mutación venezolana S349L. Por otra parte, dos pacientes presentan proteínas mutadas con actividadresidual, y pudieron verse beneficiados de la terapia con BH4. Conclusiones. En Venezuela, al igual que en gran parte de los países en vías de desarrollo, se realiza el estudio neonatal de PKU pero el programa no cubre toda la población neonatal. En este trabajo se quiere destacar la importancia del estudio neonatal en el bienestar de los niños, y el uso del diagnóstico molecular para mejorar la orientación terapéutica y la asesoría genética de la familia

Introduction. Massive neonatal screening for phenylketonuria (PKU) began in developed countries in 1963, and eventually disappeared as a cause of mental retardation. Yet, this is not the case in most developing countries. Aim. To describe the phenotype and the genotype of PKU patients with a delayed diagnosis in order to draw attention to the importance of neonatal studies and molecular diagnosis. Patients and methods. Clinical data were collected from five unrelated patients by means of a medical assessment. The molecular study was conducted using the DGGE, sequencing and/or restriction analysis techniques to search for mutations in the PAH gene. Results. Owing to the delayed diagnosis all thepatients presented severe clinical manifestations, such as psychomotor retardation, atypical behaviours and language disorders. Four of them presented epilepsy and there were two cases of microcephaly. The phenotype was as expected, given the genotype. Seven different mutations were detected in the 10 alleles that were studied. The IVS10nt+5g>t mutation was themost frequent, followed by the Venezuelan mutation S349L. Furthermore, two patients presented mutated proteins with residual activity, and good results were obtained using BH4 therapy. Conclusions. In our country, as in most developingcountries, PKU neonatal studies are performed but the programme does not cover the whole neonatal population. In this work, we want to stress the importance of neonatal studies in the welfare of children, as well as the use of molecular diagnosis to improve the therapeutic orientation and genetic counselling of the families involved

L-2-hydroxyglutaric aciduria: identification of ten novel mutations in the L2HGDH gene.

L-2-hydroxyglutaric aciduria (L-2-HGA) is a metabolic disease with an autosomal recessive mode of inheritance. It was first reported in 1980. Patients with this disease have mutations in both alleles of the L2HDGH gene. The clinical presentation of individuals with L-2-HGA is somewhat variable, but affected individuals typically suffer from progressive neurodegeneration. Analysis of urinary organic acids reveals an increased signal of 2-hydroxyglutaric acid, mainly as the L-enantiomer. L-2-HGA is known to occur in individuals of various ethnic backgrounds, but up to now mutation analysis has been mainly focused on patients of Turkish and Portuguese origin. This led us to confirm the diagnosis on the DNA level and undertake the corresponding mutation analysis in individuals of diverse ethnicity previously diagnosed with L-2-HGA on the basis of urinary metabolites and clinical/neuroimaging data. In 24 individuals from 17 families with diverse ethnic and geographic origins, 13 different mutations were found, 10 of which have not been reported previously. At least eight of the patients were compound heterozygotes. The identification of two mutations (c.751C > T and c.905C > T in exon 7) in patients with different origins supports the view that they occurred independently in different families. In contrast, the mutation c.788C > T was detected in all six Venezuelan patients originating from the same Caribbean island of Margarita, but not in other patients, thus rendering a founder effect likely. None of the mutations was found in the control population, indicating that they are most probably causative. Mutation analysis may improve the quality of diagnosis and prenatal diagnosis of L-2-HGA.

Methylmalonic acidaemia: examination of genotype and biochemical data in 32 patients belonging to mut, cblA or cblB complementation group.

Methylmalonic acidaemia (MMA) is a genetic disorder caused by defects in methylmalonyl-CoA mutase or in any of the different proteins involved in the synthesis of adenosylcobalamin. The aim of this work was to examine the biochemical and clinical phenotype of 32 MMA patients according to their genotype, and to study the mutant mRNA stability by real-time PCR analysis. Using cellular and biochemical methods, we classified our patient cohort as having the MMA forms mut (n = 19), cblA (n = 9) and cblB (n = 4). All the mut (0) and some of the cblB patients had the most severe clinical and biochemical manifestations, displaying non-inducible propionate incorporation in the presence of hydroxocobalamin (OHCbl) in vitro and high plasma odd-numbered long-chain fatty acid (OLCFA) concentrations under dietary therapy. In contrast, mut (-) and cblA patients exhibited a milder phenotype with propionate incorporation enhanced by OHCbl and normal OLCFA levels under dietary therapy. No missense mutations identified in the MUT gene, including mut (0) and mut (-) changes, affected mRNA stability. A new sequence variation (c.562G>C) in the MMAA gene was identified. Most of the cblA patients carried premature termination codons (PTC) in both alleles. Interestingly, the transcripts containing the PTC mutations were insensitive to nonsense-mediated decay (NMD).

[Glutaric aciduria type I. Clinical, biochemical and molecular findings in six patients in Venezuela]. / Aciduria glutárica tipo I. Hallazgos clínicos, bioquímicos y moleculares en seis pacientes venezolanos.

INTRODUCTION: Glutaric aciduria type I is an autosomal recessive inborn error of metabolism that is due to a deficiency of the enzyme glutaryl-CoA dehydrogenase, which gives rise to an accumulation of glutaric and 3-hydroxyglutaric acids in biological fluids. Clinical features present as a sudden-onset severe neurological disorder, characterised by extrapyramidal signs (dystonia-dyskinesia), hypotonia, irritability, macrocephaly and degeneration of the basal ganglia; it may also manifest with unspecific symptoms, such as hypotonia and psychomotor retardation. AIMS: To describe the clinical, biochemical, neuroimaging and molecular aspects in six Venezuelan patients and to highlight the importance of an early diagnosis of glutaric aciduria type I so as to be able to establish early treatment and thus prevent the neurological damage produced by this disease. CASE REPORTS: Two patients were referred because of macrocephaly, hypotonia and psychomotor retardation, and four more following an encephalopathic crisis. In all of them, neuroimaging studies showed delays in myelination, bilateral frontotemporal hypoplasia and symmetric widening of the Sylvian fissures with poor opercularisation. Urinary organic acid analyses showed raised levels of glutaric and 3-hydroxyglutaric acids, and a molecular analysis confirmed the diagnosis. CONCLUSIONS: Organic acid analysis should be indicated in all patients who present macrocephaly, hypotonia, psychomotor retardation or an encephalopathic crisis of unknown causation. This study allowed us to determine the behaviour of the disease in Venezuela, since no epidemiological data exist in the country.

Aciduria glutárica tipo I. Hallazgos clínicos, bioquímicos y moleculares en seis pacientes venezolanos / Glutaric aciduria type I. Clinical, biochemical and molecular findings in six patients in Venezuela

Introducción. La aciduria glutárica tipo I es un error congénito del metabolismo, con herencia autosómica recesiva, debido a la deficiencia de la enzima glutaril-CoA deshidrogenasa, que da lugar a la acumulación de ácido glutárico y 3-hidroxiglutárico en fluidos biológicos. El cuadro clínico se presenta como un trastorno neurológico grave, de inicio súbito, caracterizado por signos extrapiramidales (distonía-discinesia), hipotonía, irritabilidad, macrocefalia y degeneración de los ganglios basales; o puede manifestarse con síntomas inespecíficos, como hipotonía y retraso psicomotor. Objetivos. Describir los aspectos clínicos, bioquímicos, de neuroimagen y moleculares en seis pacientes venezolanos y resaltar la importancia del diagnóstico precoz de la aciduria glutárica tipo I para instaurar tratamiento temprano y evitar el daño neurológico que esta enfermedad produce. Casos clínicos. Se remitieron dos pacientes por macrocefalia, hipotonía y retraso psicomotor, y cuatro posteriores a una crisis encefalopática. Los estudios de neuroimagen mostraron en todos ellos retraso en la mielinización, hipoplasia frontotemporal bilateral y ensanchamiento simétrico de las cisuras de Silvio con pobre opercularización. El análisis de ácidos orgánicos en orina mostró niveles incrementados de los ácidos glutárico y 3-hidroxiglutárico, y el análisis molecular permitió la confirmación del diagnóstico. Conclusiones. En todo paciente que se presenta con macrocefalia, hipotonía, retraso psicomotor o una crisis encefalopática sin causa determinada debe indicarse el análisis de ácidos orgánicos. Este estudio permitió conocer el comportamiento de la enfermedad en Venezuela, ya que no existen datos epidemiológicos en el país

Introduction. Glutaric aciduria type I is an autosomal recessive inborn error of metabolism that is due to a deficiency of the enzyme glutaryl-CoA dehydrogenase, which gives rise to an accumulation of glutaric and 3-hydroxyglutaric acids in biological fluids. Clinical features present as a sudden-onset severe neurological disorder, characterised by extrapyramidal signs (dystonia-dyskinesia), hypotonia, irritability, macrocephaly and degeneration of the basal ganglia; it may also manifest with unspecific symptoms, such as hypotonia and psychomotor retardation. Aims. To describe the clinical, biochemical, neuroimaging and molecular aspects in six Venezuelan patients and to highlight the importance of an early diagnosis of glutaric aciduria type I so as to be able to establish early treatment and thus prevent the neurological damage produced by this disease. Case reports. Two patients were referred because of macrocephaly, hypotonia and psychomotor retardation, and four more following an encephalopathic crisis. In all of them, neuroimaging studies showed delays in myelination, bilateral frontotemporal hypoplasia and symmetric widening of the Sylvian fissures with poor opercularisation. Urinary organic acid analyses showed raised levels of glutaric and 3-hydroxyglutaric acids, and a molecular analysis confirmed the diagnosis. Conclusions. Organic acid analysis should be indicated in all patients who present macrocephaly, hypotonia, psychomotor retardation or an encephalopathic crisis of unknown causation. This study allowed us to determine the behaviour of the disease in Venezuela, since no epidemiological data exist in the country

[Meningeal febrile syndrome and hemiplegia revealing infectious endocarditis: the story of a catheter-related infection]. / Syndrome méningé fébrile et hémiplégie compliquant une endocardite infectieuse : histoire d'une infection liée aux cathéters.

INTRODUCTION: We report the case of a 48-years patient who is under chimotherapy because of a breast cancer. She was initially found at her place in coma with hyperthermia and neurological deficiency signs. The clinic history and the paraclinical investigations have enabled to detect a catheter-related infection (CRI) as soon as the diagnosis of disseminated infectious endocarditis was made. The resonance imaging confirmed the cerebral blow when it found suspicious images of septic embolus. EXEGESIS: The CRI are usually detected at an early stage and if the classical association CRI-infectious endocarditis-systemical embolus is well known, the discovery on a CRI not treated at the stade of a febril coma is exceptional. CONCLUSION: More than ever the taking care of infectious endocarditis, still delicate and sometimes perilous, requires a global taking care of the patient.

[In utero macrocephaly as clinical manifestation of glutaric aciduria type I. Report of a novel mutation]. / Macrocefalia in utero como manifestación clínica de aciduria glutárica tipo I. Informe de una nueva mutacion.

INTRODUCTION: Macrocephaly is a pivotal clinical sign, associated with multiple neurological diseases, particularly neurometabolical ones, such as the glutaric aciduria type I (GA I). This aciduria resulting from the genetical deficiency of the enzyme glutaryl-CoA dehydrogenase (GCDH). Is a relatively common cause of acute metabolic brain damage in early childhood. We report on one case of GA I, with early manifestations since fetal period and a novel mutation. CASE REPORT: Our patient was referred due macrocephaly in utero and occipitofrontal head circumference above the 98 percentile for chronologic age during first few months of life, hypotonia and development delay. The metabolic investigations of organic acids in urine and acylcarnitine profile in blood, the brain magnetic resonance and the molecular analyses of the glutaryl-CoA deshidrogenase gene, confirm the diagnosis. The molecular analysis allowed to identify one previously described mutation A293T and a novel mutation IVS5-2 A>G. CONCLUSION: It is important the recognition of in utero macrocephaly as a sign to early diagnosis of glutaric aciduria type I to initiate specific therapy to prevent the encephalopathic crises and minimize brain damage in patients who are already neurologically impaired.

[L-2-hydroxyglutaric aciduria: clinical, biochemical and neuroradiological findings in two Venezuelan patients]. / Aciduria L-2-hidroxiglutárica: aspectos clínicos, bioquímicos y de neuroimagen en dos pacientes venezolanos.

INTRODUCTION: L-2-hydroxyglutaric aciduria is a rare inborn error of metabolism, autosomal recessive, identified in about 50 patients. The primary defect is still unknown. The clinical phenotype is variable. Affected individuals show slowly progressive neurodegenerative disorder with cerebellar ataxia and mental retardation. Pyramidal, and extrapyramidal signs, seizures and macrocephaly have been reported. All patients previously described show a pattern of subcortical leukoencephalopathy with nearly empty gyral cores and cerebellar atrophy in neuroimaging studies. The diagnosis is established by detection of increased levels of L-2-hydroxyglutaric acid in urine, plasma and cerebrospinal fluid. CASE REPORTS: We here describe two patients 7 and 9 years old, who presented psychomotor retardation, seizures, progressive cognitive deterioration, and pyramidal, extrapyramidal and cerebellar signs. Magnetic resonance scanning of the brain demonstrated a bilateral subcortical leukoencephalopathy pattern and areas of increased T2-weighted signal in the basal ganglia and cerebellar dentate nuclei. The analysis of organic acids in urine by gas chromatography/mass spectrometry showed elevated 2-hydroxyglutaric acid, 100% of it in the form of L enantiomer. CONCLUSION: The diagnostic consideration is based on clinical findings and typical neuroimaging pattern and is established by detection of L-2-hydroxyglutaric acid in body fluids. Subcortical white matter loss is an important clue to diagnosis.

Aciduria L-2-hidroxiglutárica: aspectos clínicos, bioquímicos y de neuroimagen en dos pacientes venezolanos / L-2-hydroxyglutaric aciduria: clinical, biochemical and neuroradiological findings in two Venezuelan patients

Introducción. La aciduria L-2-hidroxiglutárica es un error innato del metabolismo poco frecuente, con transmisión autosómica recesiva, identificado en cerca de 50 pacientes, y cuyo defecto enzimático todavía se desconoce. Se expresa como un trastorno neurodegenerativo lentamente progresivo, caracterizado por ataxia cerebelosa y retraso mental. Se han comunicado signos piramidales y extrapiramidales, convulsiones y macrocefalia. Todos los pacientes investigados muestran un patrón característico de leucoencefalopatía subcortical y atrofia cerebelosa en las imágenes de resonancia magnética (RM). El diagnóstico se establece por la detección de una concentración aumentada de ácido L-2-hidroxiglutárico en orina, plasma y líquido cefalorraquídeo. Casos clínicos. Se describen dos pacientes, de 7 y 9 años de edad, que presentaron retraso psicomotor, convulsiones y deterioro cognitivo progresivo, acompañado de manifestaciones piramidales, extrapiramidales y cerebelosas. La RM cerebral reveló un patrón de leucoencefalopatía subcortical bilateral, lesiones hiperintensas en secuencias T2, en los ganglios de la base y los núcleos dentados del cerebelo. Al determinar los ácidos orgánicos en la orina se encontró un incremento en la excreción del ácido 2-hidroxiglutárico por cromatografía de gases y espectrometría de masas, y el 100 por ciento de este metabolito correspondió al enantiómero L. El diagnóstico se basa en las manifestaciones clínicas y el patrón típico de neuroimagen y se establece por la detección del ácido L-2-hidroxiglutárico en los fluidos corporales. Conclusión. Aunque es un trastorno poco frecuente, en los pacientes que presenten deterioro neurológico progresivo asociado a un patrón radiológico como el descrito, se debe sospechar y descartar la aciduria L-2-hidroxiglutárica (AU)

Introduction. L-2-hydroxyglutaric aciduria is a rare inborn error of metabolism, autosomal recessive, identified in about 50 patients. The primary defect is still unknown. The clinical phenotype is variable. Affected individuals show slowly progressive neurodegenerative disorder with cerebellar ataxia and mental retardation. Pyramidal, and extrapyramidal signs, seizures and macrocephaly have been reported. All patients previously described show a pattern of subcortical leukoencephalopathy with nearly empty gyral cores and cerebellar atrophy in neuroimaging studies. The diagnosis is established by detection of increased levels of L-2-hydroxyglutaric acid in urine, plasma and cerebrospinal fluid. Case reports. We here describe two patients 7 and 9 years old, who presented psychomotor retardation, seizures, progressive cognitive deterioration, and pyramidal, extrapyramidal and cerebellar signs. Magnetic resonance scanning of the brain demonstrated a bilateral subcortical leukoencephalopathy pattern and areas of increased T2-weighted signal in the basal ganglia and cerebellar dentate nuclei. The analysis of organic acids in urine by gas chromatography/mass spectrometry showed elevated 2-hydroxyglutaric acid, 100% of it in the form of L enantiomer. Conclusion. The diagnostic consideration is based on clinical findings and typical neuroimaging pattern and is established by detection of L-2-hydroxyglutaric acid in body fluids. Subcortical white matter loss is an important clue to diagnosis

Partial androgen receptor deficiency and mixed gonadal dysgenesis in Drash syndrome.

Drash syndrome associates a nephropathy characterized by a diffuse mesangial sclerosis of early onset, Wilms tumor, and male pseudohermaphroditism (MPH). A patient with Drash syndrome is reported with the following: karyotype 46,XY, external genitalia near normal female, mixed gonadal dysgenesis, severe androgen receptor deficiency demonstrated for the first time in this syndrome. The possibility of a common genetic denominator with the del 11p13 WAGR complex is suggested. MPH/nephroblastoma association is common. Androgen receptor deficiency has been observed in one case of each syndrome, respectively.

A clinical and immunopathological study of 304 cases of glomerulonephritis in Tunisia.

304 cases of glomerulonephritis were biopsied in Tunisia and studied morphologically. The incidence of glomerulonephritis with marked proliferation of endocapillary cells was 60%, a figure considerably higher than in other large series. Using a Clq binding assay, statistically significant levels of immune complexes were found in cases of acute proliferative glomerulonephritis. Amongst other types of glomerulonephritis, circulating immune complexes were frequently found in systemic lupus erythematosus but only in a low percentage of primary glomerulonephritis with or without immunoglobulin deposits.