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新的性系统（XX/XYY）的出现表明，在“单型”的 Oecomys auyantepui 啮齿动物（Rodentia，Sigmodontinae）中存在一个物种复合体。

The emergence of a new sex-system (XX/XYY) suggests a species complex in the "monotypic" rodent Oecomys auyantepui (Rodentia, Sigmodontinae).

机构信息

Laboratório de Citogenética, Centro de Estudos Avançados da Biodiversidade, Instituto de Ciências Biológicas, Universidade Federal do Pará (UFPA), Belém, Pará, Brazil.

Department of Veterinary Medicine, Cambridge Resource Centre for Comparative Genomics, University of Cambridge, Cambridge, UK.

出版信息

Sci Rep. 2022 May 24;12(1):8690. doi: 10.1038/s41598-022-12706-3.

DOI:10.1038/s41598-022-12706-3
PMID:35610291
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9130129/
Abstract

X-autosome translocation (XYY) has been reported in distinct groups of vertebrates suggesting that the rise of a multiple sex system within a species may act as a reproductive barrier and lead to speciation. The viability of this system has been linked with repetitive sequences located between sex and autosomal portions of the translocation. Herein, we investigate Oecomys auyantepui, using chromosome banding and Fluorescence In Situ Hybridization with telomeric and Hylaeamys megacephalus whole-chromosome probes, and phylogenetic reconstruction using mtDNA and nuDNA sequences. We describe an amended karyotype for O. auyantepui (2n = 64♀65♂/FNa = 84) and report for the first time a multiple sex system (XX/XYY) in Oryzomyini rodents. Molecular data recovered O. auyantepui as a monophyletic taxon with high support and cytogenetic data indicate that O. auyantepui may exist in two lineages recognized by distinct sex systems. The Neo-X exhibits repetitive sequences located between sex and autosomal portions, which would act as a boundary between these two segments. The G-banding comparisons of the Neo-X chromosomes of other Sigmodontinae taxa revealed a similar banding pattern, suggesting that the autosomal segment in the Neo-X can be shared among the Sigmodontinae lineages with a XYY sex system.

摘要

X 染色体与常染色体易位（XYY）已在不同的脊椎动物群体中报道，这表明物种内多性系统的出现可能作为生殖障碍并导致物种形成。该系统的可行性与位于易位的性染色体和常染色体部分之间的重复序列有关。在此，我们使用染色体带型和端粒和 Hylaeamys megacephalus 整条染色体探针的荧光原位杂交技术，以及 mtDNA 和 nuDNA 序列的系统发育重建，研究了 Oecomys auyantepui。我们描述了 O. auyantepui 的修正核型（2n = 64♀65♂/FNa = 84），并首次报道了 Oryzomyini 啮齿动物中的多性系统（XX/XYY）。分子数据将 O. auyantepui 作为一个单系类群回收，并得到了高度支持，细胞遗传学数据表明 O. auyantepui 可能存在两个由不同性系统识别的谱系。Neo-X 表现出位于性染色体和常染色体部分之间的重复序列，这些序列将作为这两个部分之间的边界。其他 Sigmodontinae 分类群的 Neo-X 染色体 G 带比较显示出相似的带型模式，这表明 Neo-X 中的常染色体片段可以在具有 XYY 性系统的 Sigmodontinae 谱系中共享。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b13/9130129/f225dd988d91/41598_2022_12706_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b13/9130129/80cc9b8ada1c/41598_2022_12706_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b13/9130129/f4e1e4475544/41598_2022_12706_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b13/9130129/ad9e48479210/41598_2022_12706_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b13/9130129/e4c620731a78/41598_2022_12706_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b13/9130129/a8d4567c6540/41598_2022_12706_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b13/9130129/afc134022c3a/41598_2022_12706_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b13/9130129/c71ef3d1fda9/41598_2022_12706_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b13/9130129/f225dd988d91/41598_2022_12706_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b13/9130129/80cc9b8ada1c/41598_2022_12706_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b13/9130129/f4e1e4475544/41598_2022_12706_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b13/9130129/ad9e48479210/41598_2022_12706_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b13/9130129/e4c620731a78/41598_2022_12706_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b13/9130129/a8d4567c6540/41598_2022_12706_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b13/9130129/afc134022c3a/41598_2022_12706_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b13/9130129/c71ef3d1fda9/41598_2022_12706_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b13/9130129/f225dd988d91/41598_2022_12706_Fig8_HTML.jpg

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