Enfoque local deliberativo de las controversias bioéticas: una oportunidad para la adecuada implementación de la tamización neonatal / Local deliberative approach to the bioethical controversies: An opportunity for the proper implementation of neonatal screening

Resumen: Introducción. Las características controversiales de la tamización neonatal influenciadas por consideraciones bioéticas hacen compleja su implementación. Colombia no es ajena a esta situación y las circunstancias locales complican el panorama. Objetivo. Determinar cómo se abordan en el contexto local las controversias bioéticas en torno a la tamización neonatal como fundamento de las deliberaciones sobre el deber ser de esta actividad en Colombia. Materiales y métodos. Se aplicó una encuesta en el marco de un estudio interpretativo con dos componentes de análisis, uno descriptivo y otro deliberativo, en torno a los valores expuestos por funcionarios del Instituto Nacional de Salud. Resultados. La oferta obligatoria de la tamización por parte de la nación, independientemente del costo de oportunidad y el consentimiento para el uso de sus resultados y de las muestras residuales en la investigación, no suscitaron controversias, pero sí el tipo de información y la autorización para hacer la tamización. Los funcionarios con mayor experiencia expresaron su preferencia por una tamización obligatoria (17,7 Vs. 11,79 años en promedio; p=0,007). Sorpresivamente, a pesar del riesgo de discriminación, teniendo como fin el neonato, hubo acuerdo en entregar toda la información a padres e historia clínica. Otro aspecto controversial fue la identificación de los pacientes en el seguimiento, frente a lo cual los funcionarios de mayor experiencia en aspectos bioéticos prefirieron el uso de códigos (4,5 Vs. 1,26 años en promedio; p=0,009). En este contexto, estrategias como el disentimiento informado, el asesoramiento especializado o los programas de salud pública que aprecien la diversidad permitirían rescatar valores, incluso aquellos aparentemente opuestos. Conclusión. La aproximación local al deber ser de la tamización neonatal desde una perspectiva bioética deliberativa permitió ajustar una propuesta para su implementación.

Abstract: Introduction: The controversial characteristics of neonatal screening influenced by bioethical considerations make its implementation complex. Colombia is not an exception in this sense and local circumstances complicate the panorama. Objective: To establish how bioethical controversies on neonatal screening are approached at a local level as a basis for deliberating on the must-be of this activity in Colombia. Materials and methods: A survey immersed in an interpretative investigation with descriptive and deliberative components of analysis was applied to approach the values exposed by officials of the Colombian Instituto Nacional de Salud. Results: The compulsory offer of screening by the nation, regardless of its opportunity cost and the consent for the use in research of results and residual samples, were not controversial, but, in contrast, the type of information and the consent to authorize screening did arise controversy. The more experienced officials preferred mandatory screening (17.7 vs. 11.79 years on average, p=0.007). Surprisingly, despite the risk of discrimination, keeping the neonate as the purpose, there was agreement on giving all the information to parents and medical records. Another controversial aspect was the follow-up of cases without hiding their identification where officials with more experience in bioethical aspects preferred the use of codes (4.5 vs. 1.26 years on average, p=0.009). In this context, strategies such as informed dissent, specialized advice or public health programs that appreciate diversity would allow to rescue even seemingly opposite values. Conclusion: A local approach regarding what ought to be in neonatal screening based on a deliberative bioethical perspective allowed to present an implementation proposal for this activity.

Bioética y políticas públicas de tamización neonatal en los Estados Unidos, el Reino Unido y Colombia / Bioethics and public policies in neonatal screening in the United States, United Kingdom, and Colombia

Resumen Introducción. La reflexiónsobre cómo deber ser la tamización neonatal requiere revelar la relevancia de los factores bioéticos involucrados. Objetivo. Comprender la relación de las consideraciones bioéticas con la forma en que se efectúa la tamización neonatal e indicar la relevancia de esta actividad en las normas colombianas. Materiales y métodos. Se hizo un estudio comparado de las políticas públicas en Estados Unidos y el Reino Unido, las cuales representan casos extremos de la tamización neonatal. Con base en las similitudes y las diferencias, se interpretó la influencia de los principios bioéticos. Con esta información, se indicaron en la normatividad colombiana sobre tamización neonatal las consideraciones bioéticas pertinentes. Resultados. En el Reino Unido prevalece la autonomía de los padres, lo que ocasiona riesgos al no cumplirse con las acciones obligatorias de beneficencia. En los Estados Unidos prevalece la beneficencia, con un amplio y obligatorio cubrimiento de anomalías sujetas a tamización, lo cual incrementa la probabilidad de falsos positivos y ocasiona un alto costo de oportunidad. Hay similitudes entre los procedimientos de los dos países que también están parcialmente contemplados en Colombia, como la pretensión de equidad en el acceso. Otras, como el asesoramiento profesional especializado o la posibilidad de rechazar la tamización, no se tienen en cuenta en la normatividad colombiana sobre tamización neonatal. Además, hay diferentes enfoques de justicia frente a la inclusión de las anomalías en la tamización y falta de armonía entre las normas, lo que impide una detección eficaz. Conclusión. Las consideraciones bioéticas no solo explican las diferencias entre países, sino que algunas veces prevalecen en la concepción de las políticas públicas de tamización neonatal. En Colombia, se propone su inclusión en las normas de mayor jerarquía para hacerlas más efectivas.

Abstract Introduction: Thinking about how neonatal screening should be done requires explaining the relevance of the bioethical factors involved. Objective: To understand the relationship between bioethical considerations and the way neonatal screening is done and to identify its relevance in the Colombian legislation. Materials and methods: A comparative study of public policies in the United States and the United Kingdom was done, as they exemplify extreme cases of neonatal screening. The influence of bioethical principles was interpreted based on similarities and differences. With this information, locally affected bioethical considerations were identified in the Colombian legislation on neonatal screening. Results: In the United Kingdom, paternal autonomy prevails allowing parents to deny obligatory beneficence. In the USA, beneficence prevails and a significant number of anomalies must be screened for. This increases the likelihood of false positives and causes a high opportunity cost. Both countries have similarities which are also partially accepted in Colombia, suchas the demand for equity of access. Others, suchas specialized professional advice or the right to refuse screening, are not considered in the Colombian legislation on neonatal screening. Additionally, there are circumstances in Colombia such as different perspectives on what respecting justice means and how to apply that in choosing which abnormalities are screened for and lack of harmony between norms that prevents efficacious detection. Conclusion: Bioethical considerations explain the differences between countries and sometimes prevail in the development of public policies on neonatal screening. Their inclusion in high-level norms in Colombia for effective screening is proposed.

Creating and validating a warfarin pharmacogenetic dosing algorithm for Colombian patients.

PURPOSE: Warfarin is an oral anticoagulant associated with adverse reaction to drugs due to wide inter- and intra-individual dosage variability. Warfarin dosage has been related to non-genetic and genetic factors. CYP2C9 and VKORC1 gene polymorphisms affect warfarin metabolism and dosage. Due to the central role of populations' ethnical and genetic origin on warfarin dosage variability, novel algorithms for Latin American subgroups are necessary to establish safe anticoagulation therapy. PATIENTS AND METHODS: We genotyped CYP2C9*2 (c.430C > T), CYP2C9*3 (c.1075A > C), CYP4F2 (c.1297G > A), and VKORC1 (-1639 G > A) polymorphisms in 152 Colombian patients who received warfarin. We evaluated the impact on the variability of patients' warfarin dose requirements. Multiple linear regression analysis, using genetic and non-genetic variables, was used for creating an algorithm for optimal warfarin maintenance dose. RESULTS: Median weekly prescribed warfarin dosage was significantly lower in patients having the VKORC1-1639 AA genotype and poor CYP2C9*2/*2,*2/*3 metabolizers than their wild-type counterparts. We found a 2.3-fold increase in mean dose for normal sensitivity patients (wild-type VKORC1/CYP2C9 genotypes) compared to the other groups (moderate and high sensitivity); 31.5% of the patients in our study group had warfarin sensitivity-related genotypes. The estimated regression equation accounted for 44.4% of overall variability in regard to warfarin maintenance dose. The algorithm was validated, giving 45.9% correlation (R 2=0.459). CONCLUSION: Our results describe and validate the first algorithm for predicting warfarin maintenance in a Colombian mestizo population and have contributed toward the understanding of pharmacogenetics in a Latin American population subgroup.

Prediction of sensitivity to warfarin based on VKORC1 and CYP2C9 polymorphisms in patients from different places in Colombia.

INTRODUCTION: In the search to prevent hemorrhages associated with anticoagulant therapy, a major goal is to validate predictors of sensitivity to warfarin. However, previous studies in Colombia that included polymorphisms in the VKORC1 and CYP2C9 genes as predictors reported different algorithm performances to explain dose variations, and did not evaluate the prediction of sensitivity to warfarin.  OBJECTIVE: To determine the accuracy of the pharmacogenetic analysis, which includes the CYP2C9 *2 and *3 and VKORC1 1639G>A polymorphisms in predicting patients' sensitivity to warfarin at the Hospital Militar Central, a reference center for patients born in different parts of Colombia.  MATERIALS AND METHODS: Demographic and clinical data were obtained from 130 patients with stable doses of warfarin for more than two months. Next, their genotypes were obtained through a melting curve analysis. After verifying the Hardy-Weinberg equilibrium of the genotypes from the polymorphisms, a statistical analysis was done, which included multivariate and predictive approaches.  RESULTS: A pharmacogenetic model that explained 52.8% of dose variation (p<0.001) was built, which was only 4% above the performance resulting from the same data using the International Warfarin Pharmacogenetics Consortium algorithm. The model predicting the sensitivity achieved an accuracy of 77.8% and included age (p=0.003), polymorphisms *2 and *3 (p=0.002) and polymorphism 1639G>A (p<0.001) as predictors.  CONCLUSIONS: These results in a mixed population support the prediction of sensitivity to warfarin based on polymorphisms in VKORC1 and CYP2C9 as a valid approach in Colombian patients.

Predicción de la sensibilidad a la warfarina con base en polimorfismos de los genes VKORC1 y CYP2C9 en pacientes colombianos / Prediction of sensitivity to warfarin based on VKORC1 and CYP2C9 polymorphisms in patients from different places in Colombia

Introducción. La validación de los factores predictores de la sensibilidad a la warfarina es importante para evitar las hemorragias asociadas con la terapia anticoagulante. En los estudios previos hechos en Colombia con polimorfismos de los genes VKORC1 y CYP2C9 , se reportaban algoritmos con rendimientos diferentes para explicar la variación de las dosis, pero no se evaluaba la predicción de la sensibilidad a la warfarina. Objetivo. Determinar la exactitud del análisis farmacogenético de los polimorfismos *2 y *3 en el gen CYP2C9 y 1639G>A en el gen VKORC1 para predecir la sensibilidad a la warfarina en pacientes del Hospital Militar Central, un centro de referencia que atiende pacientes de diferentes lugares de Colombia. Materiales y métodos. Se recopilaron los datos demográficos y clínicos de 130 pacientes que habían recibido una dosis estable de warfarina durante más de dos meses. Se obtuvieron sus genotipos mediante un análisis de curvas de fusión , y, después de verificar el equilibrio de Hardy-Weinberg de los polimorfismos, se hizo un análisis estadístico con enfoque multivariado y predictivo. Resultados. Se construyó un modelo farmacogenético que explicó el 52,8 % de la variación de la dosis (p<0,001), solo 4 % por encima del rendimiento obtenido con los mismos datos usando el algoritmo del International Warfarin Pharmacogenetics Consortium . El modelo predictivo de sensibilidad logró 77,8 % de exactitud e incluyó como factores la edad (p=0,003), los polimorfismos *2 y *3 (p=0,002) y el polimorfismo 1639G>A (p<0,001). Conclusiones. Estos resultados en una población mestiza colombiana respaldan la validez de la predicción de la sensibilidad a la warfarina basada en los polimorfismos de los genes VKORC1 y CYP2C9.

Introduction: In the search to prevent hemorrhages associated with anticoagulant therapy, a major goal is to validate predictors of sensitivity to warfarin. However, previous studies in Colombia that included polymorphisms in the VKORC1 and CYP2C9 genes as predictors reported different algorithm performances to explain dose variations, and did not evaluate the prediction of sensitivity to warfarin. Objective: To determine the accuracy of the pharmacogenetic analysis, which includes the CYP2C9 *2 and *3 and VKORC1 1639G>A polymorphisms in predicting patients´ sensitivity to warfarin at the Hospital Militar Central , a reference center for patients born in different parts of Colombia. Materials and methods: Demographic and clinical data were obtained from 130 patients with stable doses of warfarin for more than two months. Next, their genotypes were obtained through a melting curve analysis. After verifying the Hardy-Weinberg equilibrium of the genotypes from the polymorphisms, a statistical analysis was done, which included multivariate and predictive approaches. Results: A pharmacogenetic model that explained 52.8% of dose variation (p<0.001) was built, which was only 4% above the performance resulting from the same data using the International Warfarin Pharmacogenetics Consortium algorithm. The model predicting the sensitivity achieved an accuracy of 77.8% and included age (p=0.003), polymorphisms *2 and *3 (p=0.002) and polymorphism 1639G>A (p<0.001) as predictors. Conclusions: These results in a mixed population support the prediction of sensitivity to warfarin based on polymorphisms in VKORC1 and CYP2C9 as a valid approach in Colombian patients.

Alzheimer's disease and HLA-A2: linking neurodegenerative to immune processes through an in silico approach.

There is a controversial relationship between HLA-A2 and Alzheimer's disease (AD). It has been suggested a modifier effect on the risk that depends on genetic loadings. Thus, the aims of this study were to evaluate this relationship and to reveal genes associated with both concepts the HLA-A gene and AD. Consequently, we did first a classical systematic review and a meta-analysis of case-control studies. Next, by means of an in silico approach, we used experimental knowledge of protein-protein interactions to evaluate the top ranked genes shared by both concepts, previously found through text mining. The meta-analysis did not show a significant pooled OR (1.11, 95% CI: 0.98 to 1.24 in Caucasians), in spite of the fact that four of the included studies had a significant OR > 1 and none of them a significant OR < 1. In contrast, the in silico approach retrieved nonrandomly shared genes by both concepts (P = 0.02), which additionally encode truly interacting proteins. The network of proteins encoded by APP, ICAM-1, ITGB2, ITGAL, SELP, SELL, IL2, IL1B, CD4, and CD8A linked immune to neurodegenerative processes and highlighted the potential roles in AD pathogenesis of endothelial regulation, infectious diseases, specific antigen presentation, and HLA-A2 in maintaining synapses.

The autoimmune tautology: an in silico approach.

There is genetic evidence of similarities and differences among autoimmune diseases (AIDs) that warrants looking at a general panorama of what has been published. Thus, our aim was to determine the main shared genes and to what extent they contribute to building clusters of AIDs. We combined a text-mining approach to build clusters of genetic concept profiles (GCPs) from the literature in MedLine with knowledge of protein-protein interactions to confirm if genes in GCP encode proteins that truly interact. We found three clusters in which the genes with the highest contribution encoded proteins that showed strong and specific interactions. After projecting the AIDs on a plane, two clusters could be discerned: Sjögren's syndrome-systemic lupus erythematosus, and autoimmune thyroid disease-type1 diabetes-rheumatoid arthritis. Our results support the common origin of AIDs and the role of genes involved in apoptosis such as CTLA4, FASLG, and IL10.

Human leukocyte antigen class II and type 1 diabetes in Latin America: a combined meta-analysis of association and family-based studies.

Conclusions from association studies could be spurious because of population stratification; therefore we combined association with family studies seeking to confirm which human leukocyte antigen (HLA) class II alleles/haplotypes were associated with type 1 diabetes (T1D) in the admixed Latin America. By calculating the effect summary odds ratios (OR) and their 95% confidence intervals (95% CI), data up to June 2010 showed that risk associations were observed with DRB1*0301-DQA1*0501-DQB1*0201 (odds ratio [OR]: 7.51; 95% confidence interval [CI]: 3.69-15.25) and DQB1*0302 in presence of DRB1*0405 (OR: 11.64; 95% CI: 3.15-43.01) or DRB1*0401 (OR: 5.85; 95% CI: 3.07-11.14). In contrast, DRB1*0404-DQB1*0302 had a nonsignificant TID risk (OR: 2.23; 95% CI: 0.91-5.43). T1D protective associations were observed with DRB1*11-DQA1*0501-DQB1*0301 (OR: 0.24; 95% CI: 0.1-0.56) and DRB1*15-DQA1*0102-DQB1*0602 (OR: 0.35; 95% CI: 0.17-0.73). These results were similar to those observed in Caucasian and other populations, thus highlighting the primary role of class II HLA in T1D regardless of ethnicity. A DRB1*04 risk hierarchy was confirmed with the DRB1*0405 being in the top. A binding prediction analysis disclosed possible receptor-ligand interactions in the HLA-antigenic peptide complex.

Supervised selection of single nucleotide polymorphisms in chronic fatigue syndrome.

INTRODUCTION: The different ways for selecting single nucleotide polymorphisms have been related to paradoxical conclusions about their usefulness in predicting chronic fatigue syndrome even when using the same dataset. OBJECTIVE: To evaluate the efficacy in predicting this syndrome by using polymorphisms selected by a supervised approach that is claimed to be a method that helps identifying their optimal profile. MATERIALS AND METHODS: We eliminated those polymorphisms that did not meet the Hardy-Weinberg equilibrium. Next, the profile of polymorphisms was obtained through the supervised approach and three aspects were evaluated: comparison of prediction accuracy with the accuracy of a profile that was based on linkage disequilibrium, assessment of the efficacy in determining a higher risk stratum, and estimating the algorithm influence on accuracy. RESULTS: A valid profile (p<0.01) was obtained with a higher accuracy than the one based on linkage disequilibrium, 72.8 vs. 62.2% (p<0.01). This profile included two known polymorphisms associated with chronic fatigue syndrome, the NR3C1_11159943 major allele and the 5HTT_7911132 minor allele. Muscular pain or sinus nasal symptoms in the stratum with the profile predicted V with a higher accuracy than those symptoms in the entire dataset, 87.1 vs. 70.4% (p<0.01) and 92.5 vs. 71.8% (p<0.01) respectively. The profile led to similar accuracies with different algorithms. CONCLUSIONS: The supervised approach made it possible to discover a reliable profile of polymorphisms associated with this syndrome. Using this profile, accuracy for this dataset was the highest reported and it increased when the profile was combined with clinical data.

ZC3H12A (MCPIP1): molecular characteristics and clinical implications.

BACKGROUND: ZC3H12A is a gene whose absence is related to autoimmune disorders and to other phenotypical alterations. METHODS: A comprehensive review of the structure, molecular functions and regulation of ZC3H12A gene and its protein MCPIP1 is done in order to understand their clinical implications. RESULTS: ZC3H12A, at 1p34.3, has 9860bp, six exons and 61 described SNPs. Eleven are non-synonymous thus leading to changes in MCPIP1, the protein encoded by ZC3H12A. MCPIP1 is induced by MCP-1 and IL-1 whose signals are transduced through the NF-kß and MAPkinase pathways. This protein acts as an RNAse by degrading chemokine transcripts such as IL-1 as well as its own mRNA and as a transcription factor by reducing the expression of other chemokines induced by NF-kß such as MCP-1. It also up-regulates genes involved in several differentiation processes and apoptosis. Therefore, ZC3H12A is an equilibrium gatekeeper that not only regulates its own inducers but also controls the regulation by degrading its own mRNA. CONCLUSION: Understanding ZC3H12A gives a comprehensive panorama that promises to improve our understanding of processes in which this gene is involved including autoimmune, infectious and cardiovascular diseases.