Informace o publikaci

Insights into the karyotype and genome evolution of haplogyne spiders indicate a polyploid origin of lineage with holokinetic chromosomes

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KRÁL Jiří FORMAN Martin KOŘÍNKOVÁ Tereza LERMA Azucena HADDAD Charles MUSILOVÁ Jana ŘEZÁČ Milan ÁVILA HERRERA Ivalú M. THAKUR Shefali DIPPENAAR-SCHOEMAN Ansie S. MAREC František HOROVÁ Lucie BUREŠ Petr

Druh Článek v odborném periodiku
Časopis / Zdroj Scientific reports
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www https://rdcu.be/boPCu
Doi http://dx.doi.org/10.1038/s41598-019-39034-31
Klíčová slova evolution;flow cytometry;genome size;haplogyne spiders;holokinetic chromosomes;karyotype;
Popis Spiders are an ancient and extremely diverse animal order. They show a considerable diversity of genome sizes, karyotypes and sex chromosomes, which makes them promising models to analyse the evolution of these traits. Our study is focused on the evolution of the genome and chromosomes in haplogyne spiders with holokinetic chromosomes. Although holokinetic chromosomes in spiders were discovered a long time ago, information on their distribution and evolution in these arthropods is very limited. Here we show that holokinetic chromosomes are an autapomorphy of the superfamily Dysderoidea. According to our hypothesis, the karyotype of ancestral Dysderoidea comprised three autosome pairs and a single X chromosome. The subsequent evolution has frequently included inverted meiosis of the sex chromosome and an increase of 2n. We demonstrate that caponiids, a sister clade to Dysderoidea, have enormous genomes and high diploid and sex chromosome numbers. This pattern suggests a polyploid event in the ancestors of caponiids. Holokinetic chromosomes could have arisen by subsequent multiple chromosome fusions and a considerable reduction of the genome size. We propose that spider sex chromosomes probably do not pose a major barrier to polyploidy due to specific mechanisms that promote the integration of sex chromosome copies into the genome.
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