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Zonotrichia albicollis

ABSTRACT: The white-throated sparrow is a passerine bird native to North America

PROVIDER: PRJNA197433 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	SRR1200893_1.fastq.gz	Fastqsanger.gz
	SRR1200893_2.fastq.gz	Fastqsanger.gz
	SRR1200734.fastq.gz	Fastqsanger.gz
	SRR1200894_1.fastq.gz	Fastqsanger.gz

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Zonotrichia albicollis

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Genomic evidence for the Pleistocene and Recent population history of Native Americans

Project description:How and when the Americas were populated remains contentious. Using ancient and modern genome-wide data, we find that the ancestors of all present-day Native Americans, including Athabascans and Amerindians, entered the Americas as a single migration wave from Siberia no earlier than 23 thousand years ago (KYA), and after no more than 8,000-year isolation period in Beringia. Native Americans diversified into two basal genetic branches around 13 KYA, one in North and South America and the other restricted to North America. Subsequent gene flow resulted in some Native Americans sharing ancestry with present-day East Asians and Australo-Melanesians, the latter possibly through the ancestors of Aleutian Islanders. Putative relict populations in South America, including the historical Pericúes and Fuego-Patagonians, are not directly related to modern Australo-Melanesians.

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Contrasting population genetic patterns within the white-throated sparrow genome (Zonotrichia albicollis).

Project description:BackgroundThe level of nucleotide diversity observed across the genome is positively correlated with the local rate of recombination. Avian karyotypes are typified by large variation in chromosome size and the rate of recombination in birds has been shown to be negatively correlated with chromosome size. It has thus been predicted that nucleotide diversity is negatively correlated with chromosome size in aves. However, there is limited empirical evidence to support this prediction.ResultsHere we sequenced 27 autosomal and 12 sex chromosome-linked loci in the white-throated sparrow (Zonotrichia albicollis) to quantify and compare patterns of recombination, linkage disequilibrium (LD), and genetic diversity across the genome of this North American songbird. Genetic diversity on the autosomes varied up to 8-fold, with the lowest diversity observed on the macrochromosomes and the highest diversity on the microchromosomes. Genetic diversity on the sex chromosomes was reduced compared to the autosomes, the most extreme difference being a ~300-fold difference between the W chromosome and the microchromosomes. LD and population structure associated with a common inversion polymorphism (ZAL2/2m) in this species were found to be atypical compared to other macrochromosomes, and nucleotide diversity within this inversion on the two chromosome arrangements was more similar to that observed on the Z chromosome.ConclusionsA negative correlation between nucleotide diversity and autosome size was observed in the white-throated sparrow genome, as well as low levels of diversity on the sex chromosomes comparable to those reported in other birds. The population structure and extended LD associated with the ZAL2/2m chromosomal polymorphism are exceptional compared to the rest of the white-throated sparrow genome.

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