Cryptic Diversity in the Terminal Portion of the Chromosomes of the Dogtooth Characins, Family Cynodontidae (Ostariophysi: Characiformes).

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Accounts of Chemical Research Pub Date : 2021-06-01 Epub Date: 2021-04-12 DOI:10.1089/zeb.2020.1973
Vanessa Susan Pinheiro Figliuolo, Alex Matheus Viana Ferreira, Erika Milena Corrêa Guimarães, José Francisco de Sousa E Souza, Eliana Feldberg, Maria Claudia Gross
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引用次数: 2

Abstract

The chromosomes of the dogtooth characins, fish species of the family Cynodontidae, have only a relatively small amount of heterochromatin, including the terminal portion. Curiously, in the cynodontid Cynodon gibbus, the terminal portion is rich in repetitive DNAs, including transposable retroelements and microsatellite sequences. Given this, this study investigated the composition of the terminal portion of the chromosomes of two cynodontid species (Rhaphiodon vulpinus and Hydrolycus armatus), to compile a database for the evaluation of all three cynodontid genera, and in particular, verify the possible tendency for the accumulation of repetitive DNAs in the terminal portion of the chromosomes of C. gibbus, H. armatus, and R. vulpinus. The Rex1, Rex3, and Rex6 transposable retroelements and the (CA)15, (GA)15, (GATA)8, (GACA)8, (CAT)10, and (CAC)10 microsatellite motifs are found primarily in the terminal portion of the chromosomes of the species analyzed in this study, except R. vulpinus, which has no evidence of the presence of Rex1 or Rex3 through the fluorescent in situ hybridization technique. The mapping of the repetitive sequences, principally the microsatellite motifs, indicates a marked tendency for the accumulation of these sequences in the terminal portions of the chromosomes, which may have played a fundamental role in the differentiation of the three species.

犬齿科犬齿性状染色体末端的隐性多样性(动物物理学:性状)。
犬齿鱼(Cynodontidae)的犬齿鱼的染色体只有相对少量的异染色质,包括末端部分。奇怪的是,在cynodontid Cynodon gibbus中,末端部分富含重复dna,包括转座逆转录元件和微卫星序列。鉴于此,本研究对两种犬齿动物(Rhaphiodon vulpinus和Hydrolycus armatus)染色体末端部分的组成进行了研究,建立了对这三种犬齿动物进行评价的数据库,尤其验证了C. gibbus、H. armatus和R. vulpinus染色体末端部分可能存在重复dna积累的趋势。Rex1、Rex3和Rex6转座逆转录元件以及(CA)15、(GA)15、(GATA)8、(GACA)8、(CAT)10和(CAC)10微卫星基序主要存在于本研究分析的物种的染色体末端,但通过荧光原位杂交技术未发现vulpinus存在Rex1或Rex3的证据。重复序列的定位,主要是微卫星基序,表明这些序列在染色体末端的积累有明显的趋势,这可能在三个物种的分化中发挥了根本作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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