Germline-restricted chromosome shows remarkable variation in size among closely related passerine species

Kód výsledku v IS VaVaI

RIV/67985904:_____/22:00556703 - isvavai.cz

Nalezeny alternativní kódy

RIV/68081766:_____/22:00556703 RIV/00216208:11310/22:10447255 RIV/61988987:17310/22:A2302JX1

Výsledek na webu

https://link.springer.com/article/10.1007/s00412-022-00771-6

DOI - Digital Object Identifier

10.1007/s00412-022-00771-6

Jazyk výsledku

angličtina

Název v původním jazyce

Germline-restricted chromosome shows remarkable variation in size among closely related passerine species

Popis výsledku v původním jazyce

Passerine birds have a supernumerary chromosome in their germ cells called the germline-restricted chromosome (GRC). The GRC was first discovered more than two decades ago in zebra finch but recent studies have suggested that it is likely present in all passerines, the most species rich avian order, encompassing more than half of all modern bird species. Despite its wide taxonomic distribution, studies on this chromosome are still scarce and limited to a few species. Here, we cytogenetically analyzed the GRC in five closely related estrildid finch species of the genus Lonchura. We show that the GRC varies enormously in size, ranging from a tiny micro-chromosome to one of the largest macro-chromosomes in the cell, not only among recently diverged species but also within species and sometimes even between germ cells of a single individual. In Lonchura atricapilla, we also observed variation in GRC copy number among male germ cells of a single individual. Finally, our analysis of hybrids between two Lonchura species with noticeably different GRC size directly supported maternal inheritance of the GRC. Our results reveal the extraordinarily dynamic nature of the GRC, which might be caused by frequent gains and losses of sequences on this chromosome leading to substantial differences in genetic composition of the GRC between and even within species. Such differences might theoretically contribute to reproductive isolation between species and thus accelerate the speciation rate of passerine birds compared to other bird lineages.

Název v anglickém jazyce

Germline-restricted chromosome shows remarkable variation in size among closely related passerine species

Popis výsledku anglicky

Passerine birds have a supernumerary chromosome in their germ cells called the germline-restricted chromosome (GRC). The GRC was first discovered more than two decades ago in zebra finch but recent studies have suggested that it is likely present in all passerines, the most species rich avian order, encompassing more than half of all modern bird species. Despite its wide taxonomic distribution, studies on this chromosome are still scarce and limited to a few species. Here, we cytogenetically analyzed the GRC in five closely related estrildid finch species of the genus Lonchura. We show that the GRC varies enormously in size, ranging from a tiny micro-chromosome to one of the largest macro-chromosomes in the cell, not only among recently diverged species but also within species and sometimes even between germ cells of a single individual. In Lonchura atricapilla, we also observed variation in GRC copy number among male germ cells of a single individual. Finally, our analysis of hybrids between two Lonchura species with noticeably different GRC size directly supported maternal inheritance of the GRC. Our results reveal the extraordinarily dynamic nature of the GRC, which might be caused by frequent gains and losses of sequences on this chromosome leading to substantial differences in genetic composition of the GRC between and even within species. Such differences might theoretically contribute to reproductive isolation between species and thus accelerate the speciation rate of passerine birds compared to other bird lineages.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10602 - Biology (theoretical, mathematical, thermal, cryobiology, biological rhythm), Evolutionary biology

Projekt

GA20-23794S: Chromozom specifický pro germinální linii pěvců: porozumění jeho vzniku, funkci a roli v evoluci

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Chromosoma

ISSN

0009-5915

e-ISSN

1432-0886

Svazek periodika

131

Číslo periodika v rámci svazku

1-2

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

10

Strana od-do

77-86

Kód UT WoS článku

000779612200001

EID výsledku v databázi Scopus

2-s2.0-85127644711