Erratum: Evolution of the mating type gene pair and multiple sexes in Tetrahymena.

[This corrects the article DOI: 10.1016/j.isci.2020.101950.].

Main text

(iScience 24, 101950-1–101950-16, January 22, 2021)

In the originally published version of this article, the authors reported an incorrect entry, namely “Synclonal” in the ‘MTD pattern” column, in rows 5 (for species borealis) and 6 (for species canadensis) in Table 1. This incorrect entry is now corrected with the appropriate entry, namely “Karyonidal”. In addition, all the species names appear now in “italics” and with no capital letters. The correct table appears below.

In addition, in the originally published version of this article, the authors inadvertently omitted a novel, recently described type of selfer (Ma et al., 2020). To correct this, the authors have now added the following paragraph at the end of Data S2 and the relative paper to the list of references.

“Our classification of Tetrahymena selfers inadvertently omitted a novel, recently described type of selfer (Ma et al. 2020), determined by a somatic knock-out of the CIP1 (CDK/cyclin Interacting Protein 1) gene. This type of selfing is unprecedented because it occurs in a macronuclear genetic background in which the MTA and MTB genes have the same mating type specificity. Additional research is required to understand how this novel type of selfer fits into our new classification of Tetrahymena selfers.”

The authors sincerely apologise for the inconvenience.

Table 1. Mating type systems of Tetrahymena species investigated in this article

Clade∗	Subcladea	Species	# Mating types	MTD patternb
Borealis	“The-Mal”	thermophila	7	Karyonidal
Borealis	“The-Mal”	malaccensis	6	Karyonidal
Borealis	“Pyr-Vor”	pyriformis	asexual	N/A
Borealis	“Pyr-Vor”	vorax	asexual	N/A
Borealis	“Bor-Can”	borealis	7	Karyonidal
Borealis	“Bor-Can”	canadensis	5	Karyonidal
Australis	“Pig-Ame”	shanghaiensis	perpetual selfer	N/A
Australis	“Pig-Ame”	pigmentosa	3	Synclonal
Australis	“Pig-Ame”	americanis	9	Synclonal
Paravorax	N/A	paravorax	N/D	N/D

N/D: not determined.

aThe phylogeny is illustrated in Figure 2B.

bMating type determination pattern observed in sexual progeny (see text and Figure S1 for explanation). N/A: not applicable; only strain and only species characterized in this clade.