Pilot study of hemoglobinopathies in newborns of the Rafael Calvo maternity clinic of Cartagena, Colombia / Estudio piloto de hemoglobinopatías en recién nacidos de la Clínica Maternidad Rafael Calvo de Cartagena, Colombia

Introduction: The hemoglobinopathies are a heterogeneous group of congenital anemias from Africa, Asia and the Mediterranean. Due to the migration of this population have spread worldwide, especially in Latin America and the Caribbean region, which Cartagena de Indias is included, with a large proportion of people of African descent. The lack of routine programs that include an appropriate methodology for precise identification of those affected and carriers, impossible to know the real behavior of this disease in our country and an early and appropriate to the patients before the disease manifests itself and produce its serious consequences. Objective: To estimate the incidence and describe the epidemiological profile of hemoglobinopathies in newborns Rafael Calvo Maternity Clinic of Cartagena, in the period from January to June 2010. Methods: Prospective descriptive study of a population of 1729 newborns. Samples were collected cord blood on filter paper. Isoelectric focusing electrophoresis (IEF )was used to separate the haemoglobins. Results: 94.4% (1633samples) were normal (hemoglobinFA), 4.5% (78samples) were heterozygous for haemoglobin S (HbFAS), 1% (17samples) were heterozygous for haemoglobin C (hemoglobinFAC) and 0.1% (1 sample) was double heterozygous SC (hemoglobinFSC). Conclusion: Due to the high incidence of hemoglobinopathies found in this pilot study highlights the importance and necessity of establishing an obligatory neonatal screening in the city of Cartagena, in order to make a timely diagnosis and monitoring of affected and carrier.

Introducción:Las hemoglobinopatías comprenden un grupo heterogéneo de anemias congénitas originarias de África, Asia y la cuenca mediterránea. Debido a las migraciones de este grupo poblacional se han esparcido en todo el mundo, especialmente en América Latina y la región Caribe, en la cual está incluida Cartagena de Indias, con una gran proporción de población afrodescendiente.La inexistencia de programas rutinarios para la identificación precisa de los afectados y portadores, imposibilita conocer el comportamiento real de esta enfermedad en nuestro medio, el manejo temprano y adecuado a los pacientes, antes que la enfermedad se manifieste y produzca sus graves secuelas. Objetivo: Estimar la incidencia y describir el perfil epidemiológico de las hemoglobinopatías, en recién nacidos de la Clínica Maternidad Rafael Calvo de Cartagena, en el período de enero a junio del año 2010. Método: Estudio descriptivo prospectivo. Se tomó muestra de cordón umbilical recolectada en papel de filtro, a una población de 1729 recién nacidos, empleando la técnica de electroforesis de punto isoeléctrico. Resultados: El 94.4 % (1633 muestras) fueron normales (hemoglobina FA), el 4.5% (78 muestras) fueron heterocigotos para hemoglobina S (hemoglobina FAS), el 1% (17 muestras) fueron heterocigotos para hemoglobina C (hemoglobina FAC) y el 0.1% (1 muestra) fue doble heterocigoto SC (hemoglobina FSC). Conclusión: debido a la alta incidencia de hemoglobinopatías encontrada en este estudio piloto, se resalta la importancia de establecer un programa de tamizaje neonatal en la población de Cartagena, a fin de realizar un oportuno diagnóstico y seguimiento de los afectados y portadores.

Cloning and prokaryotic expression of LEN-5 β-lactamase gene / 中国人兽共患病学报

In order to express the gene of LEN-5 β-lactamase from a Klebsiella pneumoniae strain,plasmids in the strain were extracted and an 879bp product of LEN-5 gene was obtained with PCR.After being digested with Nde I and Xho I,LEN-5 gene was cloned into pET-26b (+) vector.Then it was confirmed by digestion and DNA sequencing in recombinant plasmid before transformed into E.coli BL21 (DE3).After inducing by IPTG,LEN-5 β-lactamase was expressed.Protein extraction was processed by ultrasonic and protein activity was detected by nitrocefin.The isoelectric focusing electrophoresis showed a pI of 7.6.These results indicated that the LEN-5 gene has been cloned and expressed in prokaryote cell successfully.

Study on the Identification and Potency Determination of L-asparaginases from 2 Kinds of Strain / 中国药房

OBJECTIVE: To discuss the identification method of L-asparaginases prepared from E.coliASI.357 and Erwinia carotovora and the optimal enzymatic reaction conditions of potency determination.METHODS: HPLC method and isoelectric focusing electrophoresis were applied for the identification of L-asparaginase from 2 kinds of strain.The effects of category of buffer solution and pH value on enzymatic reaction of potency determination of L-asparaginase were investigated.RESULTS: HPLC chromatogram of L-asparaginases from E.coli ASI.357 was different from that from Erwinia carotovora.The retention time of the peaks were 11.0 min and 11.8 min.The isoelectric point (PI) of L-asparaginase produced from E.coliASI.357 was within 4.65～5.1 and that produced from Erwinia carotovora was within 7.1～8.20.The optimal enzymatic reaction conditions of potency determination of L-asparaginase produced from E.coliASI.35 were Tris-HCl (pH=9.0) as buffer and that produced from Erwinia carotovora was 0.2 mol?L-1 phosphate (pH=8.0) as buffer.CONCLUSION: The isoelectric point (PI) of L-asparaginases produced from 2 kinds of strain is different from each other as well as their optimal enzymatic reaction conditions of potency determination.The L-asparaginases from 2 kinds of strains should be controlled as 2 different categories.