Insight into genomic changes accompanying divergence: genetic linkage maps and synteny of Lucania goodei and L. parva reveal a Robertsonian fusion.

ABSTRACT: Linkage maps are important tools in evolutionary genetics and in studies of speciation. We performed a karyotyping study and constructed high-density linkage maps for two closely related killifish species, Lucania parva and L. goodei, that differ in salinity tolerance and still hybridize in their contact zone in Florida. Using SNPs from orthologous EST contigs, we compared synteny between the two species to determine how genomic architecture has shifted with divergence. Karyotyping revealed that L. goodei possesses 24 acrocentric chromosomes (1N) whereas L. parva possesses 23 chromosomes (1N), one of which is a large metacentric chromosome. Likewise, high-density single-nucleotide polymorphism-based linkage maps indicated 24 linkage groups for L. goodei and 23 linkage groups for L. parva.

SUBMITTER: Berdan EL 

PROVIDER: S-EPMC4132168 | biostudies-literature | 2014 Jun

REPOSITORIES: biostudies-literature