Four decades of inversion polymorphism in Drosophila pseudoobscura from Mexico

Abstract

Chromosomal inversion polymorphism has been study in different natural and experimental populations of Drosophila species. D pseudoobscura first studies in Mexico started during the late 30?s of last century, here are shown the relative frequencies of 48 populations in a period of 40 years with a grand total of 7266 third chromosomes analyzed. Globally in those populations a total of 26inversions are present, in most cases their genetic structure is built by five main gene arrangements and three to six in minor frequencies not reaching a particular one more than six percent. This study includes the description of 15new inversions reported else were. The most frequent gene arrangements found were TL, CU, SC, EP and OA thatglobally represent about the 90%of the whole sample. Remaining 21 inversions were found with individual frequencies varying from one to six per cent reaching in general the remaining 10%. In some areas the dominant inversions are CH. AR. ST and PP. in some areas. Important goals of this study are the discovery and description of 15 new gene arrangements as well new species description, D. cuauhtemoci. All of them reported else were.

Genomics of natural populations: Evolutionary forces that establish and maintain gene arrangements in Drosophila pseudoobscura

“…PP and TL do occur in the same populations, and heterokaryotypes can form at appreciable frequencies allowing for recombinants. Indeed, PP/TL heterokaryotypes frequencies have been recorded as high as 32% in Mexico (Salceda, Guzman‐Rincon, de la Rosa, & Olvera, ). The size of the region affected suggests that perhaps a double crossover event generated shared variation between the two arrangements (Navarro et al., ) and the exchanged segment may have transferred adaptive genes based on a number of outlier genes that map to this segment.…”

Genomics of Natural Populations: Evolutionary Forces that Establish and Maintain Gene Arrangements inDrosophila pseudoosbscura

“…PP and TL do occur in the same populations and heterokaryotypes can form at appreciable frequencies allowing for recombinants. Indeed, PP/TL heterokaryotypes frequencies have been recorded as high as 32% in Mexico (Salceda, Guzman-Rincon, Rosa, & Olvera, 2015). The size of the region affected suggests that perhaps a double cross over event generated shared variation between the two arrangements (Arcadio Navarro et al, 1997) and the exchanged segment may have transferred adaptive genes based on a number of outlier genes that map to this segment.…”

We also CanFly! The 2nd MexFly drosophila research conference

“…1, p984;Ã Salceda, now a researcher at the National Institute for Nuclear Research of Mexico (ININ), was one of the sixty participants that attended the 2nd MexFly Drosophila Meeting held at the Center for Research and Advanced Studies of the National Polytechnic Institute (Cinvestav) in Mexico City on June 30 -July 1, 2016. He contributed a lecture where he described the continuation of work he initiated with Dobzhansky nearly 50 y ago 4,5 (Fig. 1).…”