In this section
@article{Galian:2007:10.1186/1471-2148-7-158,
author = {Galian, J and Proenca, SJR and Vogler, AP},
doi = {10.1186/1471-2148-7-158},
journal = {BMC Evolutionary Biology},
pages = {1--10},
title = {Evolutionary dynamics of autosomal-heterosomal rearrangements in a multiple-X chromosome system of tiger beetles (Cicindelidae)},
url = {http://dx.doi.org/10.1186/1471-2148-7-158},
volume = {7},
year = {2007}
}
TY - JOUR
AB - BackgroundGenetic systems involving multiple X chromosomes have arisen repeatedly in sexually reproducing animals. Tiger beetles (Cicindelidae) exhibit a phylogenetically ancient multiple-X system typically consisting of 2–4 X chromosomes and a single Y. Because recombination rates are suppressed in sex chromosomes, changes in their numbers and movement of genes between sex chromosomes and autosomes, could have important consequences for gene evolution and rates of speciation induced by these rearrangements. However, it remains unclear how frequent these rearrangements are and which genes are affected.ResultsKaryotype analyses were performed for a total of 26 North American species in the highly diverse genus Cicindela, tallying the number of X chromosomes and autosomes during mitosis and meiosis. The chromosomal location of the ribosomal rRNA gene cluster (rDNA) was used as an easily scored marker for genic turnover between sex chromosomes or autosomes. The findings were assessed in the light of a recent phylogenetic analysis of the group. While autosome numbers remained constant throughout the lineage, sex chromosome numbers varied. The predominant karyotype was n = 9+X1X2X3Y which was also inferred to be the ancestral state, with several changes to X1X2Y and X1X2X3X4Y confined to phylogenetically isolated species. The total (haploid) numbers of rDNA clusters varied between two, three, and six (in one exceptional case), and clusters were localized either on the autosomes, the sex chromosomes, or both. Transitions in rDNA localization and in numbers of rDNA clusters varied independently of each other, and also independently of changes in sex chromosome numbers.ConclusionChanges of X chromosome numbers and transposition of the rDNA locus (and presumably other genes) between autosomes and sex chromosomes in Cicindela occur frequently, and are likely to be the result of fusions or fissions between X chromosomes, rather than between sex chromosomes and autosomes.
AU - Galian,J
AU - Proenca,SJR
AU - Vogler,AP
DO - 10.1186/1471-2148-7-158
EP - 10
PY - 2007///
SN - 1471-2148
SP - 1
TI - Evolutionary dynamics of autosomal-heterosomal rearrangements in a multiple-X chromosome system of tiger beetles (Cicindelidae)
T2 - BMC Evolutionary Biology
UR - http://dx.doi.org/10.1186/1471-2148-7-158
UR - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000250565700002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR - https://bmcecolevol.biomedcentral.com/articles/10.1186/1471-2148-7-158
VL - 7
ER -
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