Document Detail

No evidence for Z-chromosome rearrangements between the pied flycatcher and the collared flycatcher as judged by gene-based comparative genetic maps.
MedLine Citation:
PMID:  20670368     Owner:  NLM     Status:  MEDLINE    
Revealing the genetic basis of reproductive isolation is fundamental for understanding the speciation process. Chromosome speciation models propose a role for chromosomal rearrangements in promoting the build up of reproductive isolation between diverging populations and empirical data from several animal and plant taxa support these models. The pied flycatcher and the collared flycatcher are two closely related species that probably evolved reproductive isolation during geographical separation in Pleistocene glaciation refugia. Despite the short divergence time and current hybridization, these two species demonstrate a high degree of intrinsic post-zygotic isolation and previous studies have shown that traits involved in mate choice and hybrid viability map to the Z-chromosome. Could rearrangements of the Z-chromosome between the species explain their reproductive isolation? We developed high coverage Z-chromosome linkage maps for both species, using gene-based markers and large-scale SNP genotyping. Best order maps contained 57-62 gene markers with an estimated average density of one every 1-1.5 Mb. We estimated the recombination rates in flycatcher Z-chromosomes to 1.1-1.3 cM/Mb. A comparison of the maps of the two species revealed extensive co-linearity with no strong evidence for chromosomal rearrangements. This study does therefore not provide support the idea that sex chromosome rearrangements have caused the relatively strong post-zygotic reproductive isolation between these two Ficedula species.
Niclas Backström; Eleftheria Palkopoulou; Anna Qvarnström; Hans Ellegren
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Publication Detail:
Type:  Journal Article     Date:  2010-07-28
Journal Detail:
Title:  Molecular ecology     Volume:  19     ISSN:  1365-294X     ISO Abbreviation:  Mol. Ecol.     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2010-08-12     Completed Date:  2010-11-01     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9214478     Medline TA:  Mol Ecol     Country:  England    
Other Details:
Languages:  eng     Pagination:  3394-405     Citation Subset:  IM    
Department of Evolutionary Biology, Evolutionary Biology Centre, Uppsala University, Norbyvägen 18D, Uppsala, Sweden.
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MeSH Terms
Chromosome Mapping*
Comparative Genomic Hybridization
Gene Rearrangement*
Genetic Markers
Linkage (Genetics)
Polymorphism, Single Nucleotide
Reproduction / genetics
Sequence Analysis, DNA
Sex Chromosomes / genetics*
Songbirds / genetics*
Reg. No./Substance:
0/Genetic Markers

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