Rapid suppression of drive for a parasitic B chromosome

Perfectti, FC, J. M.; Mesa, J. A.; Cabrero, J.; Bakkali, M.; Lopez-Leon, M. D.; Camacho, J. P. M.,  Cytogenetic and Genome Research,  106:338-343. 2004.

The persistence of parasitic B chromosomes in natural populations depends on both B ability to drive and host response to counteracting it. In the grasshopper Eyprepocnemis plorans, the B-24 chromosome is the most widespread B chromosome variant in the Torrox area ( Malaga, Spain). Its evolutionary success, replacing its ancestral neutralized B variant, B-2, was based on meiotic drive in females, as we showed in a sample caught in 1992. In females collected six years later, mean B-24 transmission ratio (k(B)) was 0.523, implying a very rapid decrease from the 0.696 observed in 1992. This shows that B-24 neutralization is running very fast and suggests that it might most likely be based on a single gene of major effect. Copyright (C) 2004 S. Karger AG, Basel.