OBJETIVO: É possível que uma disfunção nos receptores 1A de serotonina (HTR1A) desempenhe um papel na origem do comportamento suicida. Estudamos a associação entre um polimorfismo funcional no gene HTR1A e comportamento suicida. MÉTODO: Realizamos uma metanálise de estudos de associação genética já publicados através de uma busca nos banco de dados do Medline, PubMed e Web of Science para identificar uma possível correlação entre o polimorfismo rs6295 e comportamento suicida em diferentes populações. RESULTADOS: Foram selecionados quatro estudos com um total de 957 pacientes com comportamento suicida e 957 controles. O alelo G do polimorfismo rs6295 não pôde ser associado a comportamento suicida (modelo de efeitos aleatórios: OR = 1,08; 95%CI: 0,80-1,45; p(Z) = 0,80) na presença de heterogeneidade (Q = 17,84, df = 4, p = 0,0013). Em uma segunda análise, sem heterogeneidade, também foi observada uma associação negativa (OR = 0,94; 95%CI: 0,79-1,13; p(Z) = 0,99). CONCLUSÃO: Pelo que nos consta, trata-se da primeira metanálise cujo objetivo é identificar uma correlação entre o polimorfismo rs6295 do HTR1A e comportamento suicida. Os nossos resultados não demonstraram existir uma correlação entre o HTR1A e comportamento suicida. No entanto, são necessários estudos adicionais que incluam outras populações, assim como amostras maiores.

OBJECTIVE: Dysfunction of serotonin 1A receptors (HTR1A) may play a role in the genesis of suicidal behavior. We studied the association between a functional polymorphism in the HTR1A gene and suicidal behavior. METHOD: We performed a meta-analysis of published genetic association studies by searching through Medline, PubMed, and Web of Science databases to analyze a possible correlation between the rs6295 polymorphism and suicidal behavior in different populations. RESULTS: Four studies comprising a total of nine hundred and fifty seven patients with suicidal behavior and nine hundred and fifty seven controls were the eligible. The G allele of the rs6295 polymorphism may not be associated with suicidal behavior (Random-effects model: OR = 1.08; 95% CI: 0.80-1.45; p(Z) = 0.80) in presence of heterogeneity (Q = 17.84, df = 4, p = 0.0013). In a second analysis that presented no heterogeneity, a negative association was also observed (OR = 0.94; 95%CI: 0.79-1.13; p(Z) = 0.99). CONCLUSION: To our knowledge, the present study is the first meta-analysis searching for a correlation between rs6295 of HTR1A and suicidal behavior. Our results showed no association between HTR1A and suicidal behavior. However, more studies assessing different populations, as well as larger samples, are needed.

Background. Robertsonian translocations involve the long arm of acrocentric chromosomes with chromosomes13q;4q being predominantly involved. This defect can be transmitted along several generations, giving rise to chromosomally abnormal products with complete aneuploidy. It is unusual to observe this type of mutation associated with another chromosomal anomaly involving chromosome 21. The objective of this study was to describe the case of a newborn with Down's syndrome (regular trisomy 21) associated with a 13q;14q Robertsonian translocation. Case report. We report the case of a newborn male who was the product of a twin pregnancy. At birth, the newborn demonstrated the following: absent Moro's reflex, brachicephaly, slating ocular fissures, depressed nasal bridge, low-set ears, short neck, transverse palmar crease, clinodactyly of the fifth finger, right testicle undescended, and a heart murmur. Chromosomal study revealed 46.XY, t(13;14) (q10;q10), +21. Cytogenetic analysis of the family revealed in the mother (II-1) 45,XX, t(13;14) (q10;q10), the father (II-2) 46,XY; the mother's brother (II-3) 46,XY; the newborn's older sister (III-1) 46,XX; twin brother 45,XY, t(13;14) (q10;q10). Conclusions. This was an unusual case of the association of Down's syndrome with a balanced Robertsonian translocation of chromosome 13;14 maternally transmitted.

Introducción. Las traslocaciones robertsonianas balanceadas involucran al brazo largo de dos cromosomas acrocéntricos; la más frecuente es la 13q;14q, la cual se puede transmitir a varias generaciones y da origen a productos cromosómicamente anormales con aneuploidía completa. Es raro observar la coexistencia de esta traslocación con otro error meiótico que involucre al cromosoma 21. El objetivo de este trabajo fue describir el caso de un recién nacido con síndrome de Down por trisomía 21 regular con una traslocación robertsoniana balanceada 13q;14q. Caso clínico. Se trata de un recién nacido de sexo masculino con ausencia de reflejo de Moro, braquicefalia, fisuras palpebrales oblicuas, epicanto, puente nasal aplanado, implantación baja de pabellones auriculares, cuello corto, pliegue transverso palmar, clinodactilia de quinto dedo, criptorquidia derecha, soplo cardiaco y complemento cromosómico 46, XY, t(13;14) (q10;q10), +21. El estudio citogenético en los familiares mostró: en la madre (II-1) 45, XXt(13-14) (q10; q10); en el padre (II-2) 46, XY; en el hermano de la madre (II-3) 46, XY; en la hermana mayor del producto (III-1) 46, XX y en el hermano gemelo del mismo 45, XYt(13; 14) (q10-q10). Conclusiones. Se trata de un caso con síndrome de Down por trisomía 21 regular que, a su vez, es portador de una traslocación robertsoniana 13;14 heredada de la madre.

Introduction. Turner's syndrome is due to the absence or anomaly of an X chromosome, resulting in short stature, gonadal dysgenesis and various physical characteristics. The association of this syndrome with other alterations such as autoimmune diseases has been described and, in rare cases, coexists with Klippel-Feil syndrome. We undertook this study to report the case of a female with Turner's syndrome with mosaicism (45,X/46,XX/ 47,XXX) with the coexistence of Klippel-Feil syndrome. Case report. We present the case of a female patient with short stature and physical characteristics of Turner's syndrome. The patient presented with limitations of neck movement with a forced position to the right side of her skull. Karyotype showed a chromosomal complement (45,X/46,XX/47,XXX). Radiologically, fusion of the first and fifth cervical vertebrae and vertebral fusion of the seventh cervical vertebra with the first thoracic vertebra were observed. Conclusion. This may represent the first case of Turner's syndrome associated with a cytogenetic variety of Klippel-Feil syndrome.

Introducción. El síndrome de Turner se debe a la ausencia o anomalía de un cromosoma X, dando como consecuencia talla baja, disgenesia gonadal y estigmas físicos. Se ha descrito su asociación con otras alteraciones como las enfermedades de origen autoinmune y, en raros casos, coexistiendo con el síndrome de Klippel-Feil. Objetivo: informar el caso de una niña con síndrome de Turner por mosaicismo 45, X/46, XX/47, XXX y en la que coexiste el síndrome de Klippel-Feil. Caso clínico. Paciente femenino con talla baja y estigmas físicos del síndrome de Turner, que presenta limitación para los movimientos de rotación del cuello y adopta una posición obligada de inclinación lateral derecha de su cráneo. El cariotipo mostró un complemento cromosómico 45, X/46, XX/47, XXX; radiológicamente se observó fusión de la primera a la quinta vértebras cervicales y fusión vertebral de la séptima cervical con la primera torácica. Conclusión. Pudiera representar el primer caso de síndrome de Turner con esta variedad citogenética asociada al síndrome de Klippel-Feil.

Introduction. Objective: to analyze the fundamental clinical manifestations of the Moebius syndrome, and the genetic factors related to this pathology. Methods. In a retrospective descriptive study the clinical data and familiar anamnesis of 23 cases of girls and boys with Moebius syndrome attended in Children's Hospital of Villahermosa, Tabasco over the last 20 years, were analyzed. The criteria for the diagnosis were done on the basis of clinical manifestations, which included face inexpressiveness, alteration of the suction, and incomplete palpebral closure with partial or non-lateral vision. Results. Face inexpressiveness, palpebral ptosis, big auricular pavilions and microglossia were the most representative clinical data. Two patients had Poland sequence in association to this pathology. Chromosomal analysis of the 11 cases showed normality in number and structure. All the studied patients represented sporadic cases. Conclusion. An early diagnosis of Moebius syndrome favors an optimal patient management as well as an opportune genetic counseling.

Introducción. Objetivo: analizar las manifestaciones clínicas fundamentales del síndrome de Moebius, su involucro genético y los factores que en nuestro medio se relacionan con esta entidad. Métodos. En un estudio retrospectivo y descriptivo se analizaron los datos clínicos y de anamnesis familiar de 23 casos de niñas y niños con síndrome de Moebius, vistos en el Hospital del Niño de Villahermosa, Tabasco, en los últimos 20 años. Los criterios para el diagnóstico se establecieron con base a las manifestaciones clínicas, considerándose para ello a la inexpresividad facial, alteración de la succión y cierre palpebral incompleto con deficiente o nula visión lateral. Resultados. La inexpresividad facial, la ptosis palpebral, pabellones auriculares grandes y la microglosia fueron los datos clínicos más representativos. En 2 pacientes se documentó la secuencia de Poland como entidad asociada. El análisis cromosómico realizado en 11 de los casos mostró normalidad cromosómica en el número y en la estructura. Todos los pacientes estudiados representaron casos esporádicos. Conclusión. El diagnóstico temprano de la secuencia de Moebius favorece la planeación en el manejo del enfermo, y al mismo tiempo ofrece a los padres de los afectados un asesoramiento genético oportuno.