A phylogeny of planorbid snails, with implications for the evolution of Schistosoma parasites

Morgan, Jess A. T.; DeJong, Randall J.; Jung, Younghun; Khallaayoune, Khalid; Kock, Sonja; Mkoji, Gerald M.; Loker, Eric S.

doi:10.1016/s1055-7903(02)00280-4

Cited by 104 publications

(60 citation statements)

References 51 publications

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“…That former ancylids (here Laevepex and Ancylus) are nested within Planorbidae was suggested long ago by Pelseneer (1897) and has been documented by extensive molecular data (Morgan et al, 2002;Jørgensen et al, 2004;Walther et al, 2006;Albrecht et al, 2007). The monophyly of Physidae (e.g., Wethington and Lydeard, 2007), Lymnaeidae (e.g., Remigio and Blair, 1997;Puslednik et al, 2009), Acroloxidae (e.g., Walther et al, 2006) is recovered here with the highest support.…”

Section: Evolution Of Hygrophilasupporting

confidence: 61%

Phylogenetic relationships and evolution of pulmonate gastropods (Mollusca): New insights from increased taxon sampling

Dayrat

Conrad

Balayan

et al. 2011

Molecular Phylogenetics and Evolution

142

182

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Section: Evolution Of Hygrophilasupporting

confidence: 61%

Phylogenetic relationships and evolution of pulmonate gastropods (Mollusca): New insights from increased taxon sampling

Dayrat

Conrad

Balayan

et al. 2011

Molecular Phylogenetics and Evolution

142

182

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“…The sister genus of Biomphalaria is likely to be Helisoma (Morgan et al, 2002), and a representative of that genus, H. trivolvis from North America, was also shown to possess FREP-like sequences. Based on Southern blot analysis, H. trivolvis appears to have either fewer fibrinogen copies than B. glabrata, or the corresponding sequences have diverged significantly, resulting in decreased hybridization with the B. glabrata probes.…”

Section: Discussionmentioning

confidence: 99%

Representation of an immune responsive gene family encoding fibrinogen-related proteins in the freshwater mollusc Biomphalaria glabrata, an intermediate host for Schistosoma mansoni

Zhang

Loker

2004

Gene

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Fibrinogen-related proteins (FREPs) are found in the hemolymph of the freshwater snail Biomphalaria glabrata, are up-regulated following exposure to digenetic trematode parasites, and bind to trematode larval surfaces, suggestive of a role in internal defense. Southern blot and degenerate-polymerase chain reaction (PCR) analyses were undertaken to better understand the diversity of the FREP-encoding gene family. Probes corresponding to the N-terminal IgSF domains of specific FREP gene subfamilies (FREPs 2, 3, 4, 7, 12 and 13) revealed between 1 to 8 loci per subfamily on Southern blots. Probes representing the relatively conserved C-terminal fibrinogen domain of FREPs bound many sequences in Southern blots of genomic DNA from B. glabrata, and from two related gastropod species, Biomphalaria pfeifferi and Helisoma trivolvis.Using degenerate-PCR, we obtained 42 unique fibrinogen-encoding sequences from 180 clones derived from a single individual of the M-line strain of B. glabrata, further supporting the notion of their abundant representation in the B. glabrata genome. The fibrinogen-encoding sequences of FREPs encoding one or two IgSF domains tended to separate into distinct clades, but bootstrap support for this separation was low. A novel category of fibrinogen-encoding sequence was also revealed. This study provides the approximate number of gene copies in several FREP subfamilies, confirms the existence of a diverse FREP gene family, reports additional unusual sequences encoding fibrinogen-like molecules, and provides further justification to explore the functional roles of FREPs in both B. glabrata and B. pfeifferi, both important intermediate hosts of the human pathogen, Schistosoma mansoni.

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“…Surprisingly little has been done regarding the phylogenetic relationships of the freshwater pulmonates (Hygrophila), although some families, notably Planorbidae (Morgan et al, 2002;Albrecht et al, 2004), Physidae (Wethington, 2004) and Lymnaeidae (see above) have recently been investigated using mainly molecular data. However, some old classifications remain firmly entrenched.…”

Section: Phylogeny and Historical Processesmentioning

confidence: 99%

Global diversity of gastropods (Gastropoda; Mollusca) in freshwater

et al. 2007

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The world's gastropod fauna from continental waters comprises ~ 4,000 valid described species and a minimum of 33-38 independent lineages of Recent Neritimorpha, Caenogastropoda and Heterobranchia (including the Pulmonata). The caenogastropod component dominates in terms of species richness and diversity of morphology, physiology, life and reproductive modes and has produced several highly speciose endemic radiations. Ancient oligotrophic lakes (e.g., Baikal, Ohrid, Tanganyika) are key hotspots of gastropod diversity; also noteworthy are a number of lower river basins (e.g., Congo, Mekong, Mobile Bay). But unlike many other invertebrates, small streams, springs and groundwater systems have produced the most speciose associations of freshwater gastropods. Despite their ecological importance in many aquatic ecosystems, understanding of even their systematics is discouragingly incomplete. The world's freshwater gastropod fauna faces unprecedented threats from habitat loss and degradation and introduced fishes and other pests. Unsustainable use of ground water, landscape modification and stock damage are destroying many streams and springs in rural/ pastoral areas, and pose the most significant threats to the large diversity of narrow range endemics in springs and ground water. Despite comprising only ~5% of the world's gastropod fauna, freshwater gastropods account for ~ 20% of recorded mollusc extinctions. However, the status of the great majority of taxa is unknown, a situation that is exacerbated by a lack of experts and critical baseline data relating to distribution, abundance, basic life history, physiology, morphology and diet. Thus, the already considerable magnitude of extinction and high levels of threat indicated by the lUCN Red List of Threatened Species is certainly a significant underestimate.

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A phylogeny of planorbid snails, with implications for the evolution of Schistosoma parasites

Cited by 104 publications

References 51 publications

Phylogenetic relationships and evolution of pulmonate gastropods (Mollusca): New insights from increased taxon sampling

Phylogenetic relationships and evolution of pulmonate gastropods (Mollusca): New insights from increased taxon sampling

Representation of an immune responsive gene family encoding fibrinogen-related proteins in the freshwater mollusc Biomphalaria glabrata, an intermediate host for Schistosoma mansoni

Global diversity of gastropods (Gastropoda; Mollusca) in freshwater

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