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Mexico City, Mexico

Spinal muscular atrophy (SMA) is an autosomal recessive neuromuscular disorder caused by absence of or mutations in the survival motor neuron1 gene (SMN1). All SMA patients have a highly homologous copy of SMN1, the SMN2 gene. Severe (type I) SMA patients present one or two SMN2 copies, whereas milder chronic forms (type II-III) usually have three or four SMN2 copies. SMN2 dosage is important to stratify patients for motor function tests and clinical trials. Our aim was to compare three methods, marker analysis, real-time quantitative polymerase chain reaction using the LightCycler instrument, and multiple ligation-dependent probe amplification (MLPA), to characterize their accuracy in quantifying SMN2 genes. We studied a group of 62 genetically confirmed SMA patients, 54 with homozygous absence of exons 7 and 8 of SMN1 and 8 with SMN2-SMN1 hybrid genes. A complete correlation using the three methods was observed in 32 patients (51.6%). In the remaining 30 patients, discordances between the three methods were found, including under or overestimation of SMN2 copies by marker analysis with respect to the quantitative methods (LightCycler and MLPA) because of lack of informativeness of markers, 3' deletions of SMN genes, and breakpoints in SMN2-SMN1 hybrid genes. The technical limitations and advantages and disadvantages of these methods are discussed. We conclude that the three methods complement each other in estimating the SMN2 copy number in most cases. However, MLPA offers additional information to characterize SMA cases with particular rearrangements such as partial deletions and hybrid genes. Source


Amorin M.,Peruvian University of Applied Sciences | Carlin A.,Peruvian University of Applied Sciences | Protzel A.,Servicio de Genetica
Archivos Argentinos de Pediatria | Year: 2012

Mucopolysaccharidosis I (MPS I) is a rare, recessively inherited, lysosomal storage disorder caused by deficiency on the enzyme α-L-iduronidase. This defect results in accumulation of heparan and dermatan sulfate in different tissues and organs due to a deficiency in the catabolism of glycosaminoglycans. The overall incidence of MPS I is 0.99-1.99/100.000 live births. There are three clinical presentations: Hurler (severe), Hurler Scheie (mild) and Scheie (mild). We report the case of a 10-years-old male patient diagnosed with Hurler syndrome, the severe presentation, 5 years ago by enzyme α-L-iduronidase activity measurement in leukocytes; with a history of recurrent respiratory infections, umbilical hernia, corneal opacity, coarse facial features, macroglossia, hearing loss, stiffness of joints, cardiac compromise, claw hands, mental retardation and stunted growth. After enzyme replacement therapy the patient has shown improvement of visceral symptoms, but the neurological damage continuous in progress. Source


Corona-Rivera J.R.,Servicio de Genetica | Corona-Rivera J.R.,University of Guadalajara | Romo-Huerta C.O.,Servicio de Oftalmologia | Lopez-Marure E.,Servicio de Radiologia | And 3 more authors.
European Journal of Medical Genetics | Year: 2011

The Yunis-Varón syndrome (YVS) represents a rare autosomal recessive syndrome of easy recognition characterized by cleidocraneal dysplasia, absence of thumbs and halluces, distal aphalangia, ectodermal anomalies, and poor outcome. Here, we report two sisters with YVS who also had papillo-macular atrophic chorioretinopathy with " salt-and-pepper" appearance that could not be attributed to environmental or metabolic causes. Our best hypothesis is that the ocular findings in our two patients are part of the phenotypic manifestations of YVS. We suggest that an extensive ophthalmologic examination should be carried out in all children with YVS in order to define the frequency and nature of the ocular findings in these patients. © 2010 Elsevier Masson SAS. Source


Buceta S.,Servicio de Kinesiologia | Gabriela Obregon M.,Servicio de Genetica
Archivos Argentinos de Pediatria | Year: 2013

The impact produced by osteogenesis imperfecta in childrens' quality of life almost has not been reported; 65 children, 38 males, were evaluated according to the questionnaire PedsQL 4.0 Argentinean Spanish version. Median age was 7.76 years; 35 children with OI type I were compared with 30 type III-IV (according to Sillence Classification) finding significant difference in the physical domain in both visions, children and parents, and only in parents' vision in the social area. Multivariate analysis showed an association between better PedQL scores and treatment compliance (coef. β= 19.41 p= 0.03) in children's vision. In parental report on the other hand, the association was found with greater pamidronate doses (coef. β 1.44 p=0.037), lower height compromise (coef. β= 3.8; p= 0.039) and less number of fractures (coef. β=0.69; p= 0.003). © 2013 Sociedad Argentina de Pediatría. Source


The congenital adrenal hyperplasia (CAH) is an autosomal recessive inherited disorder due to a mutation of the gen of 21-hydroxilase. In the deficiency of this enzyme the cortisol is reduced and there is an excess of androgens and low level of aldosterone. In this report a special mention of the clinical and diagnostic features in this disease is done and our experience in the management of 22 children in the last 16 years. Conclusions. Mean time elapsing before diagnosis and mortality by CAH are greater in males than in females. Short stature is common in patients with classic congenital adrenal hyperplasia. Source

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