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Long-term monitoring of B-chromosome invasion and neutralization in a population of Prospero autumnale (Asparagaceae).

Pedro LanzasFrancisco PerfecttiManuel A Garrido-RamosCarmelo Ruíz-RejónMónica González-SánchezMaría PuertasJuan Pedro M Camacho
Published in: Evolution; international journal of organic evolution (2018)
B chromosomes have been reported in about 15% of eukaryotes, but long-term dynamics of B chromosomes in a single natural population has rarely been analyzed. Prospero autumnale plants collected in 1981 and 1983 at Cuesta de La Palma population had shown the presence of B chromosomes. We analyze here seven additional samples collected between 1987 and 2015, and show that B frequency increased significantly during the 1980s and showed minor fluctuations between 2005 and 2015. A mother-offspring analysis of B chromosome transmission, at population level, showed significant drive on the male side (kB  = 0.65) and significant drag on the female side (kB  = 0.33), with average B transmission rate being very close to the Mendelian rate (0.5). No significant effects of B chromosomes were observed on a number of vigor and fertility-related traits. Within a parasite/host framework, these results suggest that B chromosomes' drive on the male side is the main pathway for B chromosome invasion, whereas B chromosome drag on the female side might be the main manifestation of host genome resistance in this species. Prospero autumnale thus illuminates a novel evolutionary pathway for B chromosome neutralization by means of a decrease in B transmission through the nondriving sex.
Keyphrases
  • copy number
  • genome wide
  • cell migration
  • young adults
  • type diabetes
  • high fat diet
  • adipose tissue
  • insulin resistance
  • skeletal muscle