Abstract
Microbial eukaryotes, including amoeboids, display diverse and complex life cycles that may or may not involve sexual reproduction. A recent comprehensive gene inventory study concluded that the Amoebozoa are ancestrally sexual. However, the detection of sex genes in some lineages known for their potentially sexual life cycle was very low. Particularly, the genus Cochliopodium, known to undergo a process of cell fusion, karyogamy, and subsequent fission previously described as parasexual, had no meiosis genes detected. This is likely due to low data representation, given the extensive nuclear fusion observed in the genus. In this study, we generate large amounts of transcriptome data for 2 species of Cochliopodium, known for their high frequency of cellular and nuclear fusion, in order to study the genetic basis of the complex life cycle observed in the genus. We inventory 60 sex-related genes, including 11 meiosis-specific genes, and 31 genes involved in fusion and karyogamy. We find a much higher detection of sex-related genes, including 5 meiosisspecific genes not previously detected in Cochliopodium, in this large transcriptome data. The expressed genes form a near-complete recombination machinery, indicating that Cochliopodium is an actively recombining sexual lineage. We also find 9 fusion-related genes in Cochliopodium, although no conserved fusion-specific genes were detected in the transcriptomes. Cochliopodium thus likely uses lineage specific genes for the fusion and depolyploidization processes. Our results demonstrate that Cochliopodium possess the genetic toolkit for recombination, while the mechanism involving fusion and genome reduction remains to be elucidated.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 769-779 |
| Number of pages | 11 |
| Journal | Journal of Heredity |
| Volume | 108 |
| Issue number | 7 |
| DOIs | |
| State | Published - Oct 1 2017 |
| Externally published | Yes |
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Keywords
- Fusion
- Gene inventory
- Karyogamy
- Meiosis
- Sexual reproduction
- Transcriptome
ASJC Scopus subject areas
- Biotechnology
- Molecular Biology
- Genetics
- Genetics(clinical)
Cite this
Genetic Evidence for Sexuality in Cochliopodium (Amoebozoa). / Wood, Fiona C.; Heidari, Alireza; Tekle, Yonas I.; Wilson Sayres, Melissa.
In: Journal of Heredity, Vol. 108, No. 7, 01.10.2017, p. 769-779.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Genetic Evidence for Sexuality in Cochliopodium (Amoebozoa)
AU - Wood, Fiona C.
AU - Heidari, Alireza
AU - Tekle, Yonas I.
AU - Wilson Sayres, Melissa
PY - 2017/10/1
Y1 - 2017/10/1
N2 - Microbial eukaryotes, including amoeboids, display diverse and complex life cycles that may or may not involve sexual reproduction. A recent comprehensive gene inventory study concluded that the Amoebozoa are ancestrally sexual. However, the detection of sex genes in some lineages known for their potentially sexual life cycle was very low. Particularly, the genus Cochliopodium, known to undergo a process of cell fusion, karyogamy, and subsequent fission previously described as parasexual, had no meiosis genes detected. This is likely due to low data representation, given the extensive nuclear fusion observed in the genus. In this study, we generate large amounts of transcriptome data for 2 species of Cochliopodium, known for their high frequency of cellular and nuclear fusion, in order to study the genetic basis of the complex life cycle observed in the genus. We inventory 60 sex-related genes, including 11 meiosis-specific genes, and 31 genes involved in fusion and karyogamy. We find a much higher detection of sex-related genes, including 5 meiosisspecific genes not previously detected in Cochliopodium, in this large transcriptome data. The expressed genes form a near-complete recombination machinery, indicating that Cochliopodium is an actively recombining sexual lineage. We also find 9 fusion-related genes in Cochliopodium, although no conserved fusion-specific genes were detected in the transcriptomes. Cochliopodium thus likely uses lineage specific genes for the fusion and depolyploidization processes. Our results demonstrate that Cochliopodium possess the genetic toolkit for recombination, while the mechanism involving fusion and genome reduction remains to be elucidated.
AB - Microbial eukaryotes, including amoeboids, display diverse and complex life cycles that may or may not involve sexual reproduction. A recent comprehensive gene inventory study concluded that the Amoebozoa are ancestrally sexual. However, the detection of sex genes in some lineages known for their potentially sexual life cycle was very low. Particularly, the genus Cochliopodium, known to undergo a process of cell fusion, karyogamy, and subsequent fission previously described as parasexual, had no meiosis genes detected. This is likely due to low data representation, given the extensive nuclear fusion observed in the genus. In this study, we generate large amounts of transcriptome data for 2 species of Cochliopodium, known for their high frequency of cellular and nuclear fusion, in order to study the genetic basis of the complex life cycle observed in the genus. We inventory 60 sex-related genes, including 11 meiosis-specific genes, and 31 genes involved in fusion and karyogamy. We find a much higher detection of sex-related genes, including 5 meiosisspecific genes not previously detected in Cochliopodium, in this large transcriptome data. The expressed genes form a near-complete recombination machinery, indicating that Cochliopodium is an actively recombining sexual lineage. We also find 9 fusion-related genes in Cochliopodium, although no conserved fusion-specific genes were detected in the transcriptomes. Cochliopodium thus likely uses lineage specific genes for the fusion and depolyploidization processes. Our results demonstrate that Cochliopodium possess the genetic toolkit for recombination, while the mechanism involving fusion and genome reduction remains to be elucidated.
KW - Fusion
KW - Gene inventory
KW - Karyogamy
KW - Meiosis
KW - Sexual reproduction
KW - Transcriptome
UR - http://www.scopus.com/inward/record.url?scp=85032734040&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85032734040&partnerID=8YFLogxK
U2 - 10.1093/jhered/esx078
DO - 10.1093/jhered/esx078
M3 - Article
C2 - 29036297
AN - SCOPUS:85032734040
VL - 108
SP - 769
EP - 779
JO - Journal of Heredity
JF - Journal of Heredity
SN - 0022-1503
IS - 7
ER -