The puzzling taxonomic rank of Pijnackeria hispanica, a chimerical hybrid androgen (Insecta, Phasmida)

Milani, Liliana; Scali, Valerio; Punzi, Elisabetta; Luchetti, Andrea; Ghiselli, Fabrizio

doi:10.1007/s13127-020-00436-1

Cited by 3 publications

(3 citation statements)

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“…Further research exploring chromosome diversity and gamete production is needed to disentangle the mechanism of nuclear captures in Corbicula. This could also shed light on other systems, as androgenesis is associated with peculiarities such as hybridization and/or polyploidy and in some systems the occurrence of closely related sexual species, not only within the genus Corbicula but also in very distinct organisms (e.g., stickinsects Clonopsis and Pijnackeria genera, Milani et al 2015Milani et al , 2020.…”

Section: Introgressions Between Invasive and Native Corbicula Lineagesmentioning

confidence: 99%

Substantial genetic mixing among sexual and androgenetic lineages within the clam genus Corbicula

Vastrade¹,

Etoundi²,

Bournonville³

et al. 2022

Peer Community Journal

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Occasional" sexuality occurs when a species combines clonal reproduction and genetic mixing. This strategy is predicted to combine the advantages of both asexuality and sexuality, but its actual consequences on the genetic diversity and species longevity are poorly understood. Androgenesis, a reproductive mode in which the offspring inherits its entire nuclear genome from the father, is often reported as a strictly clonal reproductive mode. Androgenesis is the predominant reproductive mode within the hermaphroditic, invasive lineages of the mollusk genus Corbicula. Their ability to reproduce clonally through androgenesis has been determinant in their invasive success, having colonized during the 20th century American and European freshwater systems, where they became notorious invaders with a widespread, global distribution. However, in androgenetic Corbicula clams, occasional genetic mixing between distinct lineages has also been observed when the sperm of one lineage fertilizes the oocyte of another one. Because of these occasional introgressions, the genetic relationships between Corbicula species remained unclear, and the biogeographic origins of the invasive androgenetic lineages have been challenging to identify. To address these issues, we analyzed the patterns of allele sharing for several nuclear and mitochondrial molecular markers among Corbicula individuals collected across both the native and invasive range. Our results show the occurrence of an allelic pool encompassing all Corbicula freshwater species worldwide, including sexual and androgenetic ones, which highlights the substantial genetic mixing within this genus. However, the differences in allele sharing patterns between invasive lineages, and the low diversity within each lineage, suggest recent, distinct biogeographic origins of invasive Corbicula androgenetic lineages. Finally, the polyploidy, high heterozygosity, and hybrid phenotypes and genotypes found in our study probably originated from hybridization events following egg parasitism between distinct Corbicula lineages. This extensive cross-lineage mixing found in Corbicula may generate nuclear diversity in an otherwise asexually reproducing species.

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Section: Introgressions Between Invasive and Native Corbicula Lineagesmentioning

confidence: 99%

Substantial genetic mixing among sexual and androgenetic lineages within the clam genus Corbicula

Vastrade¹,

Etoundi²,

Bournonville³

et al. 2022

Peer Community Journal

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“…2001), the ant Wasmannia auropunctata (Rey et al . 2013), and some stick-insect hybrid species ( e.g., Bacillus rossius-grandii, Mantovani & Scali 1992, Pijnackeria hispanica , Milani et al . 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Further research exploring chromosome diversity and gamete production is needed to disentangle the mechanism of nuclear captures in Corbicula. This could also shed light on other systems, as androgenesis is associated with peculiarities such as hybridization and/or polyploidy and in some systems the occurrence of closely related sexual species, not only within the genus Corbicula but also in very distinct organisms (e.g., stick-insects Clonopsis and Pijnackeria genera, Milani et al 2016Milani et al , 2020. Table S3: List of the 141 individuals for which all markers are available and genetic results obtained, using the same representation as Table S2.…”

Section: Introgressions Between Invasive and Native Corbicula Lineagesmentioning

confidence: 99%

Substantial genetic mixing among sexual and androgenetic lineages within the clam genus Corbicula

Vastrade

Etoundi

Bournonville³

et al. 2019

Preprint

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18Corbicula clams were introduced during the 20 th century into America and Europe, where they became 19 notoriously successful invaders with a widespread, global distribution. Their ability to reproduce clonally through 20 androgenesis ("all-male asexuality") has been determinant in their invasive success, with only four invasive clonal 21 lineages detected across Europe and America, one of which is very abundant and widespread on both continents. 22Due to their "all-male asexuality" and egg parasitism between distinct lineages, the evolutionary and geographic 23 origins of the invasive androgenetic lineages have been challenging to identify. We analyzed here the patterns of 24 allele sharing for different molecular markers among Corbicula individuals collected worldwide. We identify three 25 distinct genetic pools containing androgenetic Corbicula lineages. While one sexual Corbicula species forms a 26 distinct fourth genetic pool, the other sexual lineages cluster with the androgenetic ones based on shared alleles. 27One genetic pool contains most androgenetic lineages and sexual C. sandai from Lake Biwa in Japan, pointing to 28 this lake as a likely origin of androgenetic Corbicula lineages. Although three distinct biogeographic origins of 29Corbicula androgenetic lineages have been identified, their recent radiation and cross-lineage genetic mixing 30 hamper classical species delimitation within this clam genus. 31 32

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Transition from sexuality to androgenesis through a meiotic modification during spermatogenesis in freshwater Corbicula clams

Etoundi,

Vastrade,

Berthelin

et al. 2024

PLoS ONE

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Asexual taxa are often considered as rare and vowed to long-term extinction, notably because of their reduced ability for rapid genetic changes and potential adaptation. The rate at which they derive from sexual ancestors and their developmental mode however influence genetic variation in asexual populations. Understanding the transition from sexuality to asexuality is therefore important to infer the evolutionary outcome of asexual taxa. The present work explored the transition from sexuality to androgenesis, a reproductive mode in which the males use female resources to clone themselves, in the freshwater Corbicula clams. Since androgenetic lineages are distinguishable from sexual clams by the production of unreduced sperm, this study investigated the cytological mechanisms underlying spermatogenesis in Corbicula by following the DNA content variation of male germ cells. The widespread androgenetic C. sp. form A/R lineage was compared to the sexual species C. japonica and C. sandai. While in C. japonica, the last stages of spermatogenesis are reduced through a canonical meiosis process, no reduced or duplicated stages were observed in C. sp. form A/R, suggesting a meiosis modification in this lineage. However, 45% of C. sandai spermatozoa were unreduced. The production of unreduced sperm may condition or provide the potential for the emergence of androgenesis in this sexual species. Being closely related to androgenetic lineages and found in sympatry with them in Lake Biwa (Japan), C. sandai might be an origin of androgenetic lineage emergence, or even an origin of the androgenetic reproductive mode in Corbicula.

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The puzzling taxonomic rank of Pijnackeria hispanica, a chimerical hybrid androgen (Insecta, Phasmida)

Cited by 3 publications

References 53 publications

Substantial genetic mixing among sexual and androgenetic lineages within the clam genus Corbicula

Substantial genetic mixing among sexual and androgenetic lineages within the clam genus Corbicula

Substantial genetic mixing among sexual and androgenetic lineages within the clam genus Corbicula

Transition from sexuality to androgenesis through a meiotic modification during spermatogenesis in freshwater Corbicula clams

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