Molecular Biology and Evolution 19:362-366 (2002)
© 2002 Society for Molecular Biology and Evolution
Frequent Intron Loss in the White Gene: A Cautionary Tale for Phylogeneticists
Center for Tropical Disease Research and Training, Department of Biological Sciences, University of Notre Dame, Indiana
It has been postulated that because spliceosomal introns are incapable of self-splicing, intron indels should be very rare, if not unique, evolutionary events (Venkatesh, Ning, and Brenner 1999
). This characteristic would make them powerful markers for phylogenetic studies, immune from problems of homoplasy that can affect primary sequence data. Counter to this argument, earlier studies of the white gene (Besansky and Fahey 1997
; Gomulski et al. 2001
) indicated a discouraging degree of promiscuity in the pattern of intron presence or absence in the white sequences then available.
Here we report a more extensive study of the intron-exon organization of the dipteran white, present as a single copy gene in all insects examined to date (Levis, Bingham, and Rubin 1982
; Besansky et al. 1995
; Ke et al. 1997
; Abraham et al. 2000
; Gomulski et al. 2001
; R. Beeman, personal communication). The white gene
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