Homogeneous nuclear background for mitochondrial cline in northern range of Notochthamalus scabrosus

G3 : Genes - Genomes - Genetics
Christina ZakasJ P Wares

Abstract

A mitochondrial cline along the Chilean coast in the barnacle Notochthamalus scabrosus suggests a species history of transient allopatry and secondary contact. However, previous studies of nuclear sequence divergence suggested population genetic homogeneity across northern and central Chile. Here, we collect single-nucleotide polymorphism data from pooled population samples sequenced with restriction site-associated DNA sequencing procedures, confirm these data with the use of a GoldenGate array, and identify a discordance between population genetic patterns in the nuclear and mitochondrial genomes. This discordance was noted in previous work on this species, but here it is confirmed that the nuclear genome exhibits only slight phylogeographic variation across 3000 km of coastline, in the presence of a strong and statistically significant mitochondrial cline. There are nevertheless markers (approximately 5% of nuclear single-nucleotide polymorphisms) exhibiting cytonuclear disequilibrium relative to mitotype. Although these data confirm our previous explorations of this species, it is likely that some of the nuclear genomic diversity of this species has yet to be explored, as comparison with other barnacle phylogeography studie...Continue Reading

References

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Datasets Mentioned

BETA
PRJNA227359

Methods Mentioned

BETA
genotyping
Illumina sequencing

Software Mentioned

tBLASTx
STRUCTURE
Popoolation2
BayesScan
GenAlEx
BayeScan
StructureHarvester
STACKS
BLASTn
BLAST

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