Population Genomic Analyses Suggest a Hybrid Origin, Cryptic Sexuality, and Decay of Genes Regulating Seed Development for the Putatively Strictly Asexual Kingdonia uniflora (Circaeasteraceae, Ranunculales)

doi:10.3390/ijms24021451

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	Population Genomic Analyses Suggest a Hybrid Origin, Cryptic Sexuality, and Decay of Genes Regulating Seed Development for the Putatively Strictly Asexual Kingdonia uniflora (Circaeasteraceae, Ranunculales)
	Sun,Yanxia; Zhang,Xu; Zhang,Aidi; Landis,Jacob B.; Zhang,Huajie; Sun,Hang; Xiang,Qiu-Yun (Jenny); Wang,Hengchang
	2023
发表期刊	INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
ISSN	1422-0067
卷号	24 期号:2 页码:1451
摘要	Asexual lineages are perceived to be short-lived on evolutionary timescales. Hence, reports for exceptional cases of putative 'ancient asexuals' usually raise questions about the persistence of such species. So far, there have been few studies to solve the mystery in plants. The monotypic Kingdonia dating to the early Eocene, contains only K. uniflora that has no known definitive evidence for sexual reproduction nor records for having congeneric sexual species, raising the possibility that the species has persisted under strict asexuality for a long period of time. Here, we analyze whole genome polymorphism and divergence in K. uniflora. Our results show that K. uniflora is characterized by high allelic heterozygosity and elevated pi(N)/pi(S) ratio, in line with theoretical expectations under asexual evolution. Allele frequency spectrum analysis reveals the origin of asexuality in K. uniflora occurred prior to lineage differentiation of the species. Although divergence within K. uniflora individuals exceeds that between populations, the topologies of the two haplotype trees, however, fail to match each other, indicating long-term asexuality is unlikely to account for the high allele divergence and K. uniflora may have a recent hybrid origin. Phi-test shows a statistical probability of recombination for the conflicting phylogenetic signals revealed by the split network, suggesting K. uniflora engages in undetected sexual reproduction. Detection of elevated genetic differentiation and premature stop codons (in some populations) in genes regulating seed development indicates mutational degradation of sexuality-specific genes in K. uniflora. This study unfolds the origin and persistence mechanism of a plant lineage that has been known to reproduce asexually and presents the genomic consequences of lack of sexuality.
关键词	asexuality allelic heterozygosity hybrid origin seed development LINKAGE DISEQUILIBRIUM BDELLOID ROTIFERS EVOLUTION HYBRIDIZATION RECOMBINATION REPRODUCTION ACCUMULATION POLYMORPHISM SPECIATION DIVERSITY
学科领域	Biochemistry & Molecular Biology ; Chemistry
DOI	10.3390/ijms24021451
WOS记录号	WOS:000915399100001
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/75012
专题	中国科学院昆明植物研究所
推荐引用方式 GB/T 7714	Sun,Yanxia,Zhang,Xu,Zhang,Aidi,et al. Population Genomic Analyses Suggest a Hybrid Origin, Cryptic Sexuality, and Decay of Genes Regulating Seed Development for the Putatively Strictly Asexual Kingdonia uniflora (Circaeasteraceae, Ranunculales)[J]. INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES,2023,24(2):1451.
APA	Sun,Yanxia.,Zhang,Xu.,Zhang,Aidi.,Landis,Jacob B..,Zhang,Huajie.,...&Wang,Hengchang.(2023).Population Genomic Analyses Suggest a Hybrid Origin, Cryptic Sexuality, and Decay of Genes Regulating Seed Development for the Putatively Strictly Asexual Kingdonia uniflora (Circaeasteraceae, Ranunculales).INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES,24(2),1451.
MLA	Sun,Yanxia,et al."Population Genomic Analyses Suggest a Hybrid Origin, Cryptic Sexuality, and Decay of Genes Regulating Seed Development for the Putatively Strictly Asexual Kingdonia uniflora (Circaeasteraceae, Ranunculales)".INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES 24.2(2023):1451.

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