Denaturing Gradient Gel Electrophoresis (DGGE) as a tool for the characterisation of Brachionus sp. strains

Many zooplanktonic organisms, like the cyclic parthenogenetic rotifer Brachionus plicatilis (Rotifera: Monogononta), are actually a complex of species and biotypes with a high degree of morphological similarity ( i.e. cryptic species). Various phylogenetic studies with molecular markers ( e.g. ITS1...

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Bibliographic Details
Published in:Aquaculture 2007-02, Vol.262 (1), p.29-40
Main Authors: Dooms, Stefania, Papakostas, Spiros, Hoffman, Stefan, Delbare, Daan, Dierckens, Kristof, Triantafyllidis, Alexander, De Wolf, Tania, Vadstein, Olav, Abatzopoulos, Theodore J., Sorgeloos, Patrick, Bossier, Peter
Format: Article
Language:English
Subjects:
16S rRNA gene
Animal aquaculture
Animal productions
Aquaculture
Biological and medical sciences
Brachionus
Brachionus plicatilis
Culture crashes
Fingerprinting
Fundamental and applied biological sciences. Psychology
General aspects
Genetic diversity
Invertebrates
Less representative or incertae sedis groups: acanthocephala, chaetognatha, gnathostomulida, lophophoria, merostomata, mesozoa, myxozoa, nematorhyncha, pararthropoda, placozoa, priapuloidea, prochordata, pycnogonida, rotifera
Marine
Mitochondrial DNA
Monogononta
Plankton
Rotifera
Rotifers
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Summary:Many zooplanktonic organisms, like the cyclic parthenogenetic rotifer Brachionus plicatilis (Rotifera: Monogononta), are actually a complex of species and biotypes with a high degree of morphological similarity ( i.e. cryptic species). Various phylogenetic studies with molecular markers ( e.g. ITS1 and COI) on wild Brachionus populations described the presence of at least nine genetically divergent Brachionus species and biotypes. Because different studies found evidence that these cryptic species and biotypes differ significantly in ecological preferences and thus probably behave differently in response to rearing conditions in the hatchery, questions rise on the actual identity of the rotifer strains used in aquaculture, where Brachionus discrimination is still based on morphology. This study is a part of an investigation of the genetic make-up of strains used in hatcheries, aquaculture research institutes and laboratories, and describes the rapid and sensitive PCR–DGGE method for the detection of Brachionus species and biotypes based on nucleotide sequence variation within the mitochondrial 16S rRNA gene. Considerable genetic diversity was found, albeit smaller within hatcheries than within laboratories and aquaculture research institutes. All 16S haplotypes produced an unambiguous DGGE fingerprint out of which a database was constructed.
ISSN:0044-8486
1873-5622
DOI:10.1016/j.aquaculture.2006.10.001