<i>Minyscapheus dominicanus</i>n. gen., n. sp. (Hemiptera: Cicadidae), a fossil cicada in Dominican amber

Poinar, George O.; Kritsky, Gene; Brown, Alex E.

doi:10.1080/08912963.2011.635791

Cited by 5 publications

(6 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These data indicate that while the patterns of Hodgkinia genome fragmentation is different in divergent Magicicada species, the overall set of retained genes is similar. For a sense of scale, the same analysis for cicadas diverged for dozens of millions of years [16][17][18][19], such as Magicicada and D. semicincta, Magicicada and T. ulnaria, and D. semicincta and T. ulnaria gives values of 0.82, 0.77, and 0.92, respectively. We note again that not all Hodgkinia genes present in Magicicada may have fully assembled due to the complexity of the dataset, so the true values for Magicicada HGCs may be higher than what we report here.…”

Section: Hodgkinia Lineage Splitting Is Ongoing In Magicicada Speciesmentioning

confidence: 97%

“…Pairwise comparisons between M. tredecim-M. neotredecim and M. tredecim-M. septendecim (500 thousand years diverged [13]), Cassini species with Decula species (2.5 million years diverged [13]), and Cassini and Decula species with Decim species (4 million years diverged [13]) give average HSI scores of 0.43, 0.46, and 0.29, respectively. This lack of similarity is remarkable given that the HSI between the single Hodgkinia genomes of Diceroprocta semicincta and Tettigades ulnaria, which diverged more than 60 million years ago [16][17][18][19], is 0.88.…”

Section: Hodgkinia Lineage Splitting Is Ongoing In Magicicada Speciesmentioning

confidence: 99%

See 1 more Smart Citation

Idiosyncratic genome degradation in a bacterial endosymbiont of periodical cicadas

Campbell

Łukasik

Simon

et al. 2017

Preprint

View full text Add to dashboard Cite

When a free-living bacterium transitions to a host-beneficial endosymbiotic lifestyle, it almost invariably loses a large fraction of its genome [1,2]. The resulting small genomes often become unusually stable in size, structure, and coding capacity [3][4][5]. Candidatus Hodgkinia cicadicola (Hodgkinia), a bacterial endosymbiont of cicadas, sometimes exemplifies this genomic stability. The Hodgkinia genome has remained completely co-linear in some cicadas diverged by tens of millions of years [6,7]. But in the long-lived periodical cicada Magicicada tredecim, the Hodgkinia genome has split into dozens of tiny, gene-sparse genomic circles that sometimes reside in distinct Hodgkinia cells [8]. Previous data suggested that other Magicicada species harbor similarly complex Hodgkinia populations, but the timing, number of origins, and outcomes of the splitting process were unknown. Here, by sequencing Hodgkinia metagenomes from the remaining six Magicicada species and two sister species, we show that all Magicicada species harbor Hodgkinia populations of at least twenty genomic circles each. We find little synteny among the 256 Hodgkinia circles analyzed except between the most closely related species. Individual gene phylogenies show that Hodgkinia first split in the common ancestor of Magicicada and its closest known relatives, but that most splitting has occurred within Magicicada and has given rise to highly variable Hodgkinia gene dosages between cicada species. These data show that Hodgkinia genome degradation has proceeded down different paths in different Magicicada species, and support a model of genomic degradation that is stochastic in outcome and likely nonadaptive for the host. These patterns mirror the genomic instability seen in some mitochondria.

show abstract

Section: Hodgkinia Lineage Splitting Is Ongoing In Magicicada Speciesmentioning

confidence: 97%

Section: Hodgkinia Lineage Splitting Is Ongoing In Magicicada Speciesmentioning

confidence: 99%

Idiosyncratic genome degradation in a bacterial endosymbiont of periodical cicadas

Campbell

Łukasik

Simon

et al. 2017

Preprint

View full text Add to dashboard Cite

show abstract

“…the CSI between the single Hodgkinia genomes of Diceroprocta semicincta and Tettigades ulnaria, which diverged more than 60 million years ago [13][14][15][16], is 0.88.…”

Section: Lengthðin Bpþof Smaller Of a And B Lengthðin Bpþof Larger Of A And Bmentioning

confidence: 98%

Idiosyncratic Genome Degradation in a Bacterial Endosymbiont of Periodical Cicadas

et al. 2017

View full text Add to dashboard Cite

When a free-living bacterium transitions to a host-beneficial endosymbiotic lifestyle, it almost invariably loses a large fraction of its genome [1, 2]. The resulting small genomes often become stable in size, structure, and coding capacity [3-5], as exemplified by Sulcia muelleri, a nutritional endosymbiont of cicadas. Sulcia's partner endosymbiont, Hodgkinia cicadicola, similarly remains co-linear in some cicadas diverged by millions of years [6, 7]. But in the long-lived periodical cicada Magicicada tredecim, the Hodgkinia genome has split into dozens of tiny, gene-sparse circles that sometimes reside in distinct Hodgkinia cells [8]. Previous data suggested that all other Magicicada species harbor complex Hodgkinia populations, but the timing, number of origins, and outcomes of the splitting process were unknown. Here, by sequencing Hodgkinia metagenomes from the remaining six Magicicada and two sister species, we show that each Magicicada species harbors Hodgkinia populations of at least 20 genomic circles. We find little synteny among the 256 Hodgkinia circles analyzed except between the most closely related cicada species. Gene phylogenies show multiple Hodgkinia lineages in the common ancestor of Magicicada and its closest known relatives but that most splitting has occurred within Magicicada and has given rise to highly variable Hodgkinia gene dosages among species. These data show that Hodgkinia genome degradation has proceeded down different paths in different Magicicada species and support a model of genomic degradation that is stochastic in outcome and nonadaptive for the host. These patterns mirror the genomic instability seen in some mitochondria.

show abstract

“…The strong selective pressure to reliably transmit nutritional symbionts to offspring is reflected in a conserved mechanism for transmission in cicadas. In D. semicincta and T. ulnaria, cicada species diverged by tens of million years (38)(39)(40)(41), both Sulcia and Hodgkinia have stable, conserved genomes (17,21), and we have shown here that these two cicadas also transmit similar numbers of Hodgkinia and Sulcia cells to each egg ( Fig. 2A).…”

Section: Discussionmentioning

confidence: 51%

Changes in endosymbiont complexity drive host-level compensatory adaptations in cicadas

Campbell

Łukasik

Meyer

et al. 2018

Preprint

View full text Add to dashboard Cite

For insects that depend on one or more bacterial endosymbionts for survival, it is critical that these bacteria are faithfully transmitted between insect generations. Cicadas harbor two essential bacterial endosymbionts, Sulcia muelleri and Hodgkinia cicadicola. In some cicada species, Hodgkinia has fragmented into multiple distinct cellular and genomic lineages that can differ in abundance by more than two orders of magnitude. This complexity presents a potential problem for the host cicada, because low-abundance-but-essential Hodgkinia lineages risk being lost during the symbiont transmission bottleneck from mother to egg. Here we show that all cicada eggs seem to receive the full complement of Hodgkinia lineages, and that in cicadas with more complex Hodgkinia this outcome is achieved by increasing the number of Hodgkinia cells transmitted by up to six-fold. We further show that cicada species with varying Hodgkinia complexity do not visibly alter their transmission mechanism at the resolution of cell biological structures. Together these data suggest that a major cicada adaptation to changes in endosymbiont complexity is an increase in the number of Hodgkinia cells transmitted to each egg. We hypothesize that the requirement to increase the symbiont titer is one of the costs associated with Hodgkinia fragmentation.

show abstract

Minyscapheus dominicanusn. gen., n. sp. (Hemiptera: Cicadidae), a fossil cicada in Dominican amber

Cited by 5 publications

References 12 publications

Idiosyncratic genome degradation in a bacterial endosymbiont of periodical cicadas

Idiosyncratic genome degradation in a bacterial endosymbiont of periodical cicadas

Idiosyncratic Genome Degradation in a Bacterial Endosymbiont of Periodical Cicadas

Changes in endosymbiont complexity drive host-level compensatory adaptations in cicadas

Contact Info

Product

Resources

About