Evaluation of four methods to identify the homozygotic sex chromosome in small populations
Abstract Background Whole genomes are commonly assembled into a collection of scaffolds and often lack annotations of autosomes, sex chromosomes, and organelle genomes (i.e., mitochondrial and chloroplast). As these chromosome types differ in effective population size and can have highly disparate e...
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ftdatacite:10.6084/m9.figshare.c.5861723.v1 2023-05-15T16:32:45+02:00 Evaluation of four methods to identify the homozygotic sex chromosome in small populations Hansen, Charles Christian Riis Westfall, Kristen M. Pálsson, Snæbjörn 2022 https://dx.doi.org/10.6084/m9.figshare.c.5861723.v1 https://springernature.figshare.com/collections/Evaluation_of_four_methods_to_identify_the_homozygotic_sex_chromosome_in_small_populations/5861723/1 unknown figshare https://dx.doi.org/10.1186/s12864-022-08393-z https://dx.doi.org/10.6084/m9.figshare.c.5861723 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Genetics FOS Biological sciences article Collection 2022 ftdatacite https://doi.org/10.6084/m9.figshare.c.5861723.v1 https://doi.org/10.1186/s12864-022-08393-z https://doi.org/10.6084/m9.figshare.c.5861723 2022-03-10T15:36:47Z Abstract Background Whole genomes are commonly assembled into a collection of scaffolds and often lack annotations of autosomes, sex chromosomes, and organelle genomes (i.e., mitochondrial and chloroplast). As these chromosome types differ in effective population size and can have highly disparate evolutionary histories, it is imperative to take this information into account when analysing genomic variation. Here we assessed the accuracy of four methods for identifying the homogametic sex chromosome in a small population using two whole genome sequences (WGS) and 133 RAD sequences of white-tailed eagles (Haliaeetus albicilla): i) difference in read depth per scaffold in a male and a female, ii) heterozygosity per scaffold in a male and a female, iii) mapping to the reference genome of a related species (chicken) with annotated sex chromosomes, and iv) analysis of SNP-loadings from a principal components analysis (PCA), based on the low-depth RADseq data. Results The best performing approach was the reference mapping (method iii), which identified 98.12% of the expected homogametic sex chromosome (Z). Read depth per scaffold (method i) identified 86.41% of the homogametic sex chromosome with few false positives. SNP-loading scores (method iv) identified 78.6% of the Z-chromosome and had a false positive discovery rate of more than 10%. Heterozygosity per scaffold (method ii) did not provide clear results due to a lack of diversity in both the Z and autosomal chromosomes, and potential interference from the heterogametic sex chromosome (W). The evaluation of these methods also revealed 10 Mb of putative PAR and gametologous regions. Conclusion Identification of the homogametic sex chromosome in a small population is best accomplished by reference mapping or examining differences in read depth between sexes. Article in Journal/Newspaper Haliaeetus albicilla DataCite Metadata Store (German National Library of Science and Technology) |
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DataCite Metadata Store (German National Library of Science and Technology) |
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unknown |
topic |
Genetics FOS Biological sciences |
spellingShingle |
Genetics FOS Biological sciences Hansen, Charles Christian Riis Westfall, Kristen M. Pálsson, Snæbjörn Evaluation of four methods to identify the homozygotic sex chromosome in small populations |
topic_facet |
Genetics FOS Biological sciences |
description |
Abstract Background Whole genomes are commonly assembled into a collection of scaffolds and often lack annotations of autosomes, sex chromosomes, and organelle genomes (i.e., mitochondrial and chloroplast). As these chromosome types differ in effective population size and can have highly disparate evolutionary histories, it is imperative to take this information into account when analysing genomic variation. Here we assessed the accuracy of four methods for identifying the homogametic sex chromosome in a small population using two whole genome sequences (WGS) and 133 RAD sequences of white-tailed eagles (Haliaeetus albicilla): i) difference in read depth per scaffold in a male and a female, ii) heterozygosity per scaffold in a male and a female, iii) mapping to the reference genome of a related species (chicken) with annotated sex chromosomes, and iv) analysis of SNP-loadings from a principal components analysis (PCA), based on the low-depth RADseq data. Results The best performing approach was the reference mapping (method iii), which identified 98.12% of the expected homogametic sex chromosome (Z). Read depth per scaffold (method i) identified 86.41% of the homogametic sex chromosome with few false positives. SNP-loading scores (method iv) identified 78.6% of the Z-chromosome and had a false positive discovery rate of more than 10%. Heterozygosity per scaffold (method ii) did not provide clear results due to a lack of diversity in both the Z and autosomal chromosomes, and potential interference from the heterogametic sex chromosome (W). The evaluation of these methods also revealed 10 Mb of putative PAR and gametologous regions. Conclusion Identification of the homogametic sex chromosome in a small population is best accomplished by reference mapping or examining differences in read depth between sexes. |
format |
Article in Journal/Newspaper |
author |
Hansen, Charles Christian Riis Westfall, Kristen M. Pálsson, Snæbjörn |
author_facet |
Hansen, Charles Christian Riis Westfall, Kristen M. Pálsson, Snæbjörn |
author_sort |
Hansen, Charles Christian Riis |
title |
Evaluation of four methods to identify the homozygotic sex chromosome in small populations |
title_short |
Evaluation of four methods to identify the homozygotic sex chromosome in small populations |
title_full |
Evaluation of four methods to identify the homozygotic sex chromosome in small populations |
title_fullStr |
Evaluation of four methods to identify the homozygotic sex chromosome in small populations |
title_full_unstemmed |
Evaluation of four methods to identify the homozygotic sex chromosome in small populations |
title_sort |
evaluation of four methods to identify the homozygotic sex chromosome in small populations |
publisher |
figshare |
publishDate |
2022 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.5861723.v1 https://springernature.figshare.com/collections/Evaluation_of_four_methods_to_identify_the_homozygotic_sex_chromosome_in_small_populations/5861723/1 |
genre |
Haliaeetus albicilla |
genre_facet |
Haliaeetus albicilla |
op_relation |
https://dx.doi.org/10.1186/s12864-022-08393-z https://dx.doi.org/10.6084/m9.figshare.c.5861723 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.5861723.v1 https://doi.org/10.1186/s12864-022-08393-z https://doi.org/10.6084/m9.figshare.c.5861723 |
_version_ |
1766022496888291328 |