Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2014 May 21;5:214. doi: 10.3389/fpls.2014.00214

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

Copyright © 2014 Sprink and Hartung.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

PMC Copyright notice

Proposed evolution scheme of SPO11 by two duplications and different loss events. The proposed evolution of the three different SPO11 genes nowadays found in land plants is shown schematically. Whereas bacteria do not possess a topoisomerase 6, LAECA has developed a topoisomerase type 6 from which the subunit TOP6A is orthologous to SPO11-3 in eukaryotes. Two duplication events of SPO11-3 took place after separation of eukarya from archaea resulting in the additional SPO11-1 and SPO11-2 genes. In different phyla loss events of either SPO11-1 or -2 occurred. After separation of the animal and fungal kingdom SPO11-2 and -3 as well as TOP6B must have been lost resulting in the remaining single SPO11 gene present in these two kingdoms. Abbreviations: LUCA, last universal common ancestor; LAECA, last archaeal-eukaryal common ancestor. The term LAECA was taken from Forterre (2013).