• Francesc Mestres

      Articles written in Journal of Genetics

    • Medium-term changes in Drosophila subobscura chromosomal inversion polymorphism: a possible relation with global warming?

      Goran Zivanovic Conxita Arenas Francesc Mestres

      More Details Abstract Fulltext PDF
    • First detection of chromosomal inversions in a natural population of the invasive pest species Drosophila suzukii


      More Details Abstract Fulltext PDF

      Drosophila suzukii is native to East and Southeast Asia and spread very fast around the world being considered an invasive pestspecies. Many demographic, population genetics and genomic studies have been recently developed, but so far no analysis has been carriedout regarding the presence of chromosomal inversions in D. suzukii natural populations. In this research, we studied polytene chromosomesof flies collected from the Font Groga (Barcelona) population. The chromosomes and many of their segments were characterized for theirsimilarity with those from D. melanogaster. This is the report of one paracentric inversion (in heterozygous condition) in the right arm ofthe third chromosome (3R). As far as we know, it is the first time that an inversion has been observed in a D. suzukii natural population.Finally, the evolutionary significance of the finding of inversions in this species is discussed.

    • Long-term changes in the inversion chromosomal polymorphism: Drosophila subobscura population from Rasht (north of Iran)


      More Details Abstract Fulltext PDF

      Drosophila subobscura is characterized by a rich chromosomal polymorphism for inversions. Many inversions are adaptive to global warming and can be classified as ‘warm’ or ‘cold’ adapted. However, most studies were carried out from European populations located in the central area of the species distribution or from American colonizing populations. For this reason, we aimed to analyse theisolated and marginal Rasht population, located in the Hyrcanian forests area (Iran). The chromosomal polymorphism for inversions was compared with the previous Rasht samples (Rasht I and II) obtained 57 years ago. This polymorphism has changed based on the inversion composition and frequencies. Interestingly, the polymorphism for inversions was scarce and similar to that of Madeira, an isolated Atlantic island. Likely, this similarity is a consequence of the marginal location and isolation of the Rasht population. Also, the chromosomal thermal index (CTI) was 0.445, showing a significant increase over those from Rasht I (0.184) and II (0.210). All these observations were inagreement with the global warming expectations. Moreover, the CTI was also computed for Russian Caucasus and Turkish populations collected more than 40 years ago to better understand the adaptive potential of D. subobscura and to study the similarity between populations of different geographic areas. In summary, the inversions of D. subobscura also changed in marginal and isolated populations in agreement with the global warming expectations, and an open question is to know where is the threshold for this evolutionary change.

  • Journal of Genetics | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2023-2024 Indian Academy of Sciences, Bengaluru.