Germ line restricted B chromosomes in grasshoppers

IF 0.8 4区生物学 Q4 BIOLOGY

Folia Biologica-Krakow Pub Date : 2023-06-30 DOI:10.3409/fb_71-2.09

J. Camacho

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引用次数: 1

Abstract

Decades ago, the presence of extra chromosomes restricted to the male germ line in several grasshopper species was interpreted as recurrent polysomy, as experimental crosses suggested that the extra chromoso- mes were not transmitted from adult male parents to their embryo offspring. Under this hypothesis, polysomy was generated de novo through a nondisjunction for some chromosomes of the standard karyotype. In the current study, I test this hypothesis by analysing 17 families of tandem repeats (TRs) in two males of the grasshopper Chorthippus parallelus, which displays mosaicism for this kind of extra chromosome. According to the de novo polysomy hypothesis, the extra chromosomes should show the same FISH pattern for the TRs analysed as at least one of the A chromosomes. However, three TR families displayed patterns of FISH bands on the standard and extra chromosomes that ruled out the former as a possible source for the latter. Therefore, these extra chromosomes are best interpreted as B chromosomes restricted to the germ line, presumably present in both sexes, which are inherited as such and are not recurrently generated de novo from the A chromosomes. Key words: Extra chromosomes, FISH, polysomy, tandem repeats

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蝗虫种系限制性B染色体

几十年前，一些蝗虫物种中存在的仅限于雄性生殖系的额外染色体被解释为复发性多染色体，因为实验杂交表明，额外的染色体不会从成年雄性父母传给其胚胎后代。根据这一假设，多染色体组是通过标准核型的一些染色体的不分离而从头产生的。在目前的研究中，我通过分析两只蝗虫Chorthpus paralleus雄性的17个串联重复序列家族（TR）来检验这一假设，这两只蝗虫表现出这种额外染色体的镶嵌性。根据从头多染色体组假说，额外的染色体应显示出与至少一条A染色体相同的TR FISH模式。然而，三个TR家族在标准染色体和额外染色体上显示出FISH带的模式，这排除了前者可能是后者的来源。因此，这些额外的染色体最好被解释为限制在生殖系中的B染色体，可能存在于两性中，它们是遗传的，不是从A染色体重新产生的。关键词：额外染色体，FISH，多染色体，串联重复

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来源期刊

Folia Biologica-Krakow 医学-生物学

CiteScore

1.10

自引率

14.30%

发文量

审稿时长

>12 weeks

期刊介绍： Folia Biologica (Kraków) is an international online open access journal accepting original scientific articles on various aspects of zoology: phylogeny, genetics, chromosomal studies, ecology, biogeography, experimental zoology and ultrastructural studies. The language of publication is English, articles are assembled in four issues per year.