Términos relacionados

43 resultados encontrados para: TEMA: Análisis genético
  • «
  • 1 de 5
  • »
1.
- Artículo de divulgación
*En hemeroteca, SIBE-Campeche, SIBE-Chetumal, SIBE-San Cristóbal, SIBE-Tapachula, SIBE-Villahermosa
Herramientas genéticas para proteger a la naturaleza
Rico Mancebo del Castillo, Yessica ;
Contenido en: ECOfronteras Vol. 23, no. 66 (mayo/agosto 2019), p. 30-33 ISSN: 2007-4549
Bibliotecas: Tapachula
Cerrar
SIBE Tapachula
32915-20 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-Campeche, SIBE-Chetumal, SIBE-San Cristóbal, SIBE-Tapachula, SIBE-Villahermosa
PDF PDF
Resumen en: Español |
Resumen en español

El análisis de ADN no solo sirve para atrapar asesinos o rastrear huellas de seres vivos de tiempos remotos; es la base de las herramientas genéticas que se aplican en varios esquemas de conservación de flora y fauna silvestres. Rastreo del comercio ilegal de especies, cría de animales en peligro de extinción, reservorios genéticos en jardines botánicos, son muestras del aporte de la genética para proteger la vida.


2.
- Artículo con arbitraje
Moina macrocopa (Straus, 1820): a species complex of a common cladocera, highlighted by morphology and DNA barcodes
Montoliu Elena, Lucía ; Elías Gutiérrez, Manuel (coaut.) ; Silva Briano, Marcelo (coaut.) ;
Contenido en: Limnetica Vol. 38, no. 1 (January 2019), p. 253-277 ISSN: 0213-8409
PDF
Resumen en: Español | Inglés |
Resumen en español

Los microcrustáceos de aguas continentales son uno de los grupos más diverso y menos estudiado del reino animal. Un enfoque integrativo, que incluya al menos, datos morfológicos, moleculares y geográficos es esencial para delimitar las especies de estos invertebrados, como es el caso del complejo Moina macrocopa. En este estudio, utilizamos tres tipos de caracteres: morfológicos, genéticos (códigos de barras del ADN) y geográficos, para demostrar que Moina macrocopa(Straus, 1820), el clado del Viejo Mundo, considerado aquí como M. macrocopa s.l., y Moina macrocopa americana Goulden, 1968, el clado americano, son especies distintas, no subespecies. Además, confirmamos que Moina macrocopa s.l. es un complejo de especies, formado por un mínimo de 3 clados diferentes.

Resumen en inglés

Freshwater microcrustaceans are one of the most diverse and understudied groups of the animal kingdom and are best described by the use of an integrative taxonomic approach, including morphological, molecular and geographical data. In this study, we used three different types of characters, including detailed morphological analyses, DNA barcodes (COI gene) and geographi-cal distribution to study the Old-World clade Moina macrocopa (Straus, 1820), here considered as M. macrocopa s.l. and the American clade Moina macrocopa americana Goulden, 1968. Results have indicated that these clades are different species and not subspecies, while Moina macrocopa s.l. is suggested to be species complex with a minimum of three different clades.


PDF PDF
Resumen en: Inglés |
Resumen en inglés

Hereditary breast and ovarian cancer syndrome (HBOC) represents 5–10% of all patients with breast cancer and is associated with high-risk pathogenic alleles in BRCA1/2 genes, but only for 25% of cases. We aimed to find new pathogenic alleles in a panel of 143 cancer-predisposing genes in 300 Mexican cancer patients with suspicion of HBOC and 27 high-risk patients with a severe family history of cancer, using massive parallel sequencing. We found pathogenic variants in 23 genes, including BRCA1/2. In the group of cancer patients 15% (46/300) had a pathogenic variant; 11% (33/300) harbored variants with unknown clinical significance (VUS) and 74% (221/300) were negative. The high-risk group had 22% (6/27) of patients with pathogenic variants, 4% (1/27) had VUS and 74% (20/27) were negative. The most recurrent mutations were the Mexican founder deletion of exons 9-12 and the variant p.G228fs in BRCA1, each found in 5 of 17 patients with alterations in this gene. Rare VUS with potential impact at the protein level were found in 21 genes. Our results show for the first time in the Mexican population a higher contribution of pathogenic alleles in other susceptibility cancer genes (54%) than in BRCA1/2 (46%), highlighting the high locus heterogeneity of HBOC and the necessity of expanding genetic tests for this disease to include broader gene panels.


4.
- Artículo con arbitraje
*En hemeroteca, SIBE-San Cristóbal
Genetic analysis of wild drone congregations of the stingless bee Scaptotrigona mexicana (Hymenoptera: Apidae) reveals a high number of colonies in a natural protected area in Southern Mexico
Sánchez Guillén, Daniel ; Vandame, Rémy (coaut.) ; Kraus, Frank Bernhard (coaut.) ;
Contenido en: Revista Mexicana de Biodiversidad Vol. 89, no. 1 (marzo 2018), p. 226-231 ISSN: 1870-3453
Nota: En hemeroteca, SIBE-San Cristóbal
PDF
Resumen en: Español | Inglés |
Resumen en español

En el presente trabajo se analizaron genéticamente congregaciones de zánganos de la abeja sin aguijón Scaptotrigona mexicana Guérin en 5 loci tipo microsatélite para estimar el número de colonias de esta especie en la Reserva de la Biosfera La Sepultura en Chiapas, México. En total se analizaron 216 zánganos provenientes de 3 congregaciones. Se encontró que las 3 tuvieron suficientes diferencias genéticas para ser consideradas de diferentes poblaciones El número promedio (± DE) de colonias por congregación fue de 19.8 ± 0.63, 17.6 ± 0.70 y 12; un número similar se reportó en áreas donde hay meliponicultura. Se discuten las implicaciones de estos hallazgos desde una perspectiva de conservación en la que la meliponicultura podría jugar un papel muy importante.

Resumen en inglés

In this study, drone congregations of the stingless bee Scaptotrigona mexicana Guérin were genetically analyzed at 5 microsatellite loci to estimate the number of colonies of this species in the La Sepultura Biosphere Reserve, in Chiapas, Mexico. A total of 216 drones from 3 congregations were analyzed. We found that the 3 congregations had enough genetic differences to be considered as coming from different populations. The average number (± SD) of colonies per congregation was 19.8 ± 0.63, 17.6 ± 0.70 and 12. A similar result was reported for areas where stingless beekeeping occurs. We discuss the implications of our findings in a conservation framework in which stingless beekeeping might play a significant role.


5.
- Artículo con arbitraje
*Solicítelo con su bibliotecario/a
Genetic variation and relationships among agaves related to the production of Tequila and Mezcal in Jalisco
Trejo, Laura (autora) ; Limones, Verónica (autora) ; Peña, Guadalupe (autora) ; Scheinvar, Enrique (autor) ; Vargas Ponce, Ofelia (autora) ; Zizumbo Villarreal, Daniel (autor) ; Colunga García-Marín, Silvia Patricia (autora) ;
Disponible en línea
Contenido en: Industrial Crops and Products Vol. 125 (December 2018), p. 140-149 ISSN: 0926-6690
Nota: Solicítelo con su bibliotecario/a
Resumen en: Inglés |
Resumen en inglés

The study of evolutionary history allows us to examine diversification, selection and domestication processes. Mexico belongs to Mesoamerica, one of the world's most important centers of origin and diversification of plants. One of the plants that has sustained its peoples for over 10,000 years is the agave (Agave sp.). Mexico is the center of diversity of the genus, with 75% of the species. Two agave products, tequila and mezcal, are of great economic and biocultural importance for Mexico. The description of genetic diversity and the identification of the wild relatives of the agave species used to produce these emblematic beverages is fundamental information for their production and conservation. Previous studies have proposed wild populations of A. angustifolia in Jalisco as possible wild relatives of blue agave or tequila (Agave tequilana). We use microsatellite (eight loci) to study the genetic diversity and the relationships between wild populations of A. angustifolia and traditional cultivars of the Agave species utilized in the production of tequila and mezcal in Jalisco. The studied taxa present intermediate genetic variation, with the exception of A. tequilana “Azul” which had the same genotype. A Structure analysis indicates that the “Azul” is closely related to A. angustifolia mainly to wild populations from southern Jalisco. Agave rhodacantha and the cultivars of A. tequilana (“Sigüin” and “Chato”) form a group separate from Agave angustifolia y A. tequilana “Azul”.


PDF PDF
Resumen en: Inglés |
Resumen en inglés

The common octopus of the Veracruz Reef System (VRS, southwestern Gulf of Mexico) has historically been considered as Octopus vulgaris, and yet, to date, no study including both morphological and genetic data has tested that assumption. To assess this matter, 52 octopuses were sampled in different reefs within the VRS to determine the taxonomic identity of this commercially valuable species using an integrative taxonomic approach through both morphological and genetic analyses. Morphological and genetic data confirmed that the common octopus of the VRS is not O. vulgarisand determined that it is, in fact, the recently described O. insularis. Morphological measurements, counts, indices, and other characteristics such as specific colour patterns, closely matched what had been reported for O. insularis in Brazil. In addition, sequences from cytochrome oxidase I (COI) and 16S ribosomal RNA (r16S) mitochondrial genes confirmed that the common octopus from the VRS is in the same highly supported clade as O. insularisfrom Brazil. Genetic distances of both mitochondrial genes as well as of cytochrome oxidase subunit III (COIII) and novel nuclear rhodopsin sequences for the species, also confirmed this finding (0–0.8%). We discuss our findings in the light of the recent reports of octopus species misidentifications involving the members of the ‘O. vulgaris species complex’ and underscore the need for more morphological studies regarding this group to properly address the management of these commercially valuable and similar taxa.


PDF PDF
Resumen en: Inglés |
Resumen en inglés

Venezuelan equine encephalitis (VEE) complex alphaviruses are important re-emerging arboviruses that cause life-threatening disease in equids during epizootics as well as spillover human infections. We conducted a comprehensive analysis of VEE complex alphaviruses by sequencing the genomes of 94 strains and performing phylogenetic analyses of 130 isolates using complete open reading frames for the nonstructural and structural polyproteins. Our analyses confirmed purifying selection as a major mechanism influencing the evolution of these viruses as well as a confounding factor in molecular clock dating of ancestors. Times to most recent common ancestors (tMRCAs) could be robustly estimated only for the more recently diverged subtypes; the tMRCA of the ID/IAB/IC/II and IE clades of VEE virus (VEEV) were estimated at ca. 149–973 years ago. Evolution of the IE subtype has been characterized by a significant evolutionary shift from the rest of the VEEV complex, with an increase in structural protein substitutions that are unique to this group, possibly reflecting adaptation to its unique enzootic mosquito vector Culex (Melanoconion) taeniopus. Our inferred tree topologies suggest that VEEV is maintained primarily in situ, with only occasional spread to neighboring countries, probably reflecting the limited mobility of rodent hosts and mosquito vectors.


8.
- Artículo con arbitraje
*Solicítelo con su bibliotecario/a
Taxonomic status of a population of black Ixalotriton from Cerro Baúl, Chiapas, México
Rovito, Sean M. ; Muñoz Alonso, Luis Antonio (coaut.) ; Lamoreux, John F. (coaut.) ; Mcknight, Meghan W. (coaut.) ; Parra Olea, Gabriela (coaut.) ;
Contenido en: Journal of Herpetology Vol. 51, no. 4 (Dec. 2017), p. 590-594 ISSN: 0022-1511
Nota: Solicítelo con su bibliotecario/a
Resumen en español

Actualmente solamente se conocen dos especies del género Ixalotriton (I. niger y I. parvus), y ambas son endémicas a pequeñas regiones de Chiapas, México. Recientemente se reportó una población adicional de Ixalotriton de color negro, de cuevas en Cerro Baúl, cerca de la única localidad conocida de I. parvus. Realizamos análisis morfométricos y moleculares de individuos de la nueva población y de I. niger para determinar si ambas poblaciones pertenecen a la misma especie. Los individuos de la población de Cerro Baúl se asemejan morfológicamente a I. niger, pero son moderadamente divergentes en su secuencia de ADN mitocondrial. Asignamos los individuos de esta población a I. niger debido a una falta de caracteres morfológicos diagnósticos. Eso representa una ampliación del rango de I. niger a una segunda localidad y significa que esa especie se encuentra en simpatría con I. parvus, aunque las dos especies se separan por su uso de microhábitat. Urge protección para la nueva población, dado los declives poblaciones de I. niger que se registraron en la localidad tipo.

Resumen en inglés

Only two species of Ixalotriton, I. niger and I. parvus, are currently known, and both are endemic to small regions of Chiapas, México. An additional population of black Ixalotriton has recently been reported from caves on Cerro Baúl, near the only known locality of I. parvus. We conducted morphological and molecular analyses of animals from the new population and I. niger to determine whether they are conspecific. Animals from the Cerro Baúl population resemble I. niger morphologically, but they are somewhat divergent in mitochondrial sequence. We assign them to I. niger because of the lack of diagnostic morphological differences. This expands the range of I. niger to a second locality and puts the two species of Ixalotriton in sympatry, although they are separated by microhabitat. Protection for the new population is urgently needed, given declines in abundance of I. niger at the type locality.


9.
- Artículo con arbitraje
Antennal phenotype of Mexican haplogroups of the Triatoma dimidiata complex, vectors of Chagas disease
May Concha, Irving Jesús (autor) ; Guerenstein, Pablo G. (autor) ; Ramsey Willoquet, Janine M. (autor) ; Rojas, Julio C. (autor) ; Catalá, Silvia S. (autora) ;
Contenido en: Infection, Genetics and Evolution Vol. 40 (June 2016), p. 73–79 ISSN: 1567-1348
Resumen en: Inglés |
Resumen en inglés

Triatoma dimidiata (Latreille) is a species complex that spans North, Central, and South America and which is a key vector of all known discrete typing units (DTU) of Trypanosoma cruzi, the etiologic agent of Chagas disease. Morphological and genetic studies indicate that T. dimidiata is a species complex with three principal haplogroups (hg) in Mexico. Different markers and traits are still inconclusive regarding if other morphological differentiation may indicate probable behavioral and vectorial divergences within this complex. In this paper we compared the antennae of three Mexican haplogroups (previously verified by molecular markers ND4 and ITS-2) and discussed possible relationships with their capacity to disperse and colonized new habitats. The abundance of each type of sensillum (bristles, basiconics, thick- and thin-walled trichoids) on the antennae of the three haplogroups, were measured under light microscopy and compared using Kruskal–Wallis non-parametric and multivariate non-parametric analyses. Discriminant analyses indicate significant differences among the antennal phenotype of haplogroups either for adults and some nymphal stages, indicating consistency of the character to analyze intraspecific variability within the complex. The present study shows that the adult antennal pedicel of the T. dimidiata complex have abundant chemosensory sensilla, according with good capacity for dispersal and invasion of different habitats also related to their high capacity to adapt to conserved as well as modified habitats.

However, the numerical differences among the haplogroups are suggesting variations in that capacity. The results here presented support the evidence of T. dimidiata as a species complex but show females and males in a different way. Given the close link between the bug's sensory system and its habitat and host-seeking behavior, AP characterization could be useful to complement genetic, neurological and ethological studies of the closely related Dimidiata Complex haplogroups for a better knowledge of their vectorial capacity and a more robust species differentiation.


10.
Artículo
*Solicítelo con su bibliotecario/a
First record of Psorophora albipes in Quintana Roo, Mexico
Chan Chable, Rahuel Jeremías ; Ortega Morales, Aldo I. (coaut.) ; Martínez Arce, Arely (coaut.) ;
Contenido en: Journal of the American Mosquito Control Association Vol. 32, no. 3 (Sep. 2016), p. 237-239 ISSN: 1943-6270
Nota: Solicítelo con su bibliotecario/a
Resumen en: Inglés |
Resumen en inglés

In Mexico the Psorophora genus includes 24 species divided into 3 subgenera: Grabhamia, Janthinosoma, and Psorophora. Some species occur in the Nearctic region of the country (northern Mexico), whereas other species occur in the Neotropical region (southern Mexico), and a few species occur in both regions. In Quintana Roo, Mexico, 7 species have been previously recorded: Ps. confinnis s.s., Ps. champerico, Ps. cyanescens, Ps. ferox, Ps. lutzii, Ps. ciliata, and Ps. lineata. In October 2013, 24 females of Ps. albipes were collected using CDC light traps. This is the first record of this species in Quintana Roo.