Abstract:Direct sequencing of mitochondrial DNA (mtDNA) D-loop (745 bp) and MTATPase6/MTATPase8 (857 bp) regions was used to investigate genetic variation within common carp and develop a global genealogy of common carp strains. The D-loop region was more variable than the MTATPase6/MTATPase8 region, but given the wide distribution of carp the overall levels of sequence divergence were low. Levels of haplotype diversity varied widely among countries with Chinese, Indonesian and Vietnamese carp showing the greatest dive… Show more
“…These authors attributed the loss of genetic variability to genetic drift due to small population sizes or to bottleneck effects, at the beginning or during the culture of populations. Similarly, Thai et al (2004) reported that a remarkable feature of European common carp samples is the low variation which suggests a history of founder effects and small effective population size, associated with translocation and domestication. However, it must also be stated that limited variation due to bottleneck effects and small effective population sizes is also frequent for a number of Greek freshwater fish populations (Apostolidis et al 1997;Imsiridou et al 1997;Triantafyllidis et al 1999).…”
Wild common carp from two lakes and two rivers in Greece were genetically characterized with sequencing analysis of two mitochondrial DNA segments: cytochrome b (1119 bp) and D-loop (646 bp). A total of 9 variable singleton sites and 7 unique haplotypes were detected. A common haplotype was found in three out of the four populations examined, which seems to be the ancestral one and represents the European origin of common carp from Greece. This haplotype could be also justified by the introductions reported with individuals belonging to the Central European race, into many natural habitats in Greece. Limited genetic variation -in Evros and Aliakmonas populations -could be due to bottleneck effects and small effective population sizes, whereas the different haplotypes found in Lake Volvi could represent different common carp stocks. Values of sequence divergence among Greek haplotypes ranged from 0.0006 to 0.0023. The Neighbour-Joining (NJ) phylogenetic tree constructed based on the combined sequences, reveals that the populations of common carp from Greece belong to the European group of populations -which is highly divergent from the South East-Asia cluster -and to the subspecies Cyprinus carpio carpio.
“…These authors attributed the loss of genetic variability to genetic drift due to small population sizes or to bottleneck effects, at the beginning or during the culture of populations. Similarly, Thai et al (2004) reported that a remarkable feature of European common carp samples is the low variation which suggests a history of founder effects and small effective population size, associated with translocation and domestication. However, it must also be stated that limited variation due to bottleneck effects and small effective population sizes is also frequent for a number of Greek freshwater fish populations (Apostolidis et al 1997;Imsiridou et al 1997;Triantafyllidis et al 1999).…”
Wild common carp from two lakes and two rivers in Greece were genetically characterized with sequencing analysis of two mitochondrial DNA segments: cytochrome b (1119 bp) and D-loop (646 bp). A total of 9 variable singleton sites and 7 unique haplotypes were detected. A common haplotype was found in three out of the four populations examined, which seems to be the ancestral one and represents the European origin of common carp from Greece. This haplotype could be also justified by the introductions reported with individuals belonging to the Central European race, into many natural habitats in Greece. Limited genetic variation -in Evros and Aliakmonas populations -could be due to bottleneck effects and small effective population sizes, whereas the different haplotypes found in Lake Volvi could represent different common carp stocks. Values of sequence divergence among Greek haplotypes ranged from 0.0006 to 0.0023. The Neighbour-Joining (NJ) phylogenetic tree constructed based on the combined sequences, reveals that the populations of common carp from Greece belong to the European group of populations -which is highly divergent from the South East-Asia cluster -and to the subspecies Cyprinus carpio carpio.
“…Kottelat [6] distinguished the common cultured carp in South East Asia as a separate species, C. rubrofuscus, although this is disputed by Nguyen and Ngo [58] who considered this species to be quite rare. Using mtDNA analysis, Thai et al [16] found that Vietnamese and Indonesian carp strains are genetically distinct from European, Chinese and Japanese strains thereby supporting the Kottelat's taxonomy [6].…”
Section: Genetic Diversity Of Common Carpmentioning
confidence: 94%
“…Interestingly, the analysis with mtDNA showed that the Amur carp holds mtDNA haplotypes, one of those is very close to that of the European carp while another one is almost identical with that of the East Asian carp [16,50].…”
Section: Genetic Diversity Of Common Carpmentioning
confidence: 98%
“…These include both protein (i.e. allozymes) [7,8] and DNA-based markers such as microsatellites [9][10][11], amplified fragment length polymorphisms (AFLPs) [10,12], restriction fragment length polymorphisms (RFLPs) [13,14], random amplification of polymorphic DNA (RAPD) [15], and mitochondrial DNA (mtDNA) variability [16,17]. Advantages and disadvantages of using each marker type in the aquaculture research have been thoroughly reviewed by Liu and Cordes [18] and hence are beyond the scope of this review.…”
Section: Molecular Markersmentioning
confidence: 99%
“…The carp mtDNA comprises 16,575 bp and contains the same set of genes (13 proteins, 2 rRNAs, and 22 tRNAs) as do other vertebrate mitochondrial DNAs [26]. Certain highly variable regions of mtDNA such as D-loop, 16S rRNA, cytochrome b, ND3/4, ND5/6, and MTATPase6/ MTATPase8 were used for study of the biodiversity of common carp by direct sequencing or PCR-RFLP analysis [16,17,[27][28][29].…”
Knowledge of genetic variation and population structure of existing strains of both farmed and wild common carp Cyprinus carpio L.is absolutely necessary for any efficient fish management and/or conservation program. To assess genetic diversity in common carp populations, a variety of molecular markers were analyzed. Of those, microsatellites and mitochondrial DNA were most frequently used in the analysis of genetic diversity and genome evolution of common carp. Using microsatellites showed that the genome evolution in common carp exhibited two waves of rearrangements: one whole-genome duplication (12-16 million years ago) and a more recent wave of segmental duplications occurring between 2.3 and 6.8 million years ago. The genome duplication event has resulted in tetraploidy since the common carp currently harbors a substantial portion of duplicated loci in its genome and twice the number of chromosomes (n =100-104) of most other cyprinid fishes. The variation in domesticated carp populations is significantly less than that in wild populations, which probably arises from the loss of variation due to founder effects and genetic drift. Genetic differentiation between the European carp C.c. carpio and Asian carp C.c. haematopterus is clearly evident. In Asia, two carp subspecies, C.c. haematopterus and C. c. varidivlaceus, seem to be also genetically distinct.
Atractolytocestus tenuicollis (Li, 1964) Xi, Wang, Wu, Gao et Nie, 2009 is a monozoic, non-segmented tapeworm of the order Caryophyllidea, parasitizing exclusively common carp (Cyprinus carpio L.). In the current work, the first molecular data, in particular complete ribosomal internal transcribed spacer 2 (ITS2) and partial mitochondrial cytochrome c oxidase subunit I (cox1) on A. tenuicollis from Niushan Lake, Wuhan, China, are provided. In order to evaluate molecular interrelationships within Atractolytocestus, the data on A. tenuicollis were compared with relevant data on two other congeners, Atractolytocestus huronensis and Atractolytocestus sagittatus. Divergent intragenomic copies (ITS2 paralogues) were detected in the ITS2 ribosomal spacer of A. tenuicollis; the same phenomenon has previously been observed also in two other congeners. ITS2 structure of A. tenuicollis was very similar to that of A. huronensis from Slovakia, USA and UK; overall pairwise sequence identity was 91.7-95.2%. On the other hand, values of sequence identity between A. tenuicollis and A. sagittatus were lower, 69.7-70.9%. Cox1 sequence, analysed in five A. tenuicollis individuals, were 100 % identical and no intraspecific variation was observed. Comparison of A. tenuicollis cox1 with respective sequences of two other Atractolytocestus species showed that the mitochondrial haplotype found in Chinese A. tenuicollis is structurally specific (haplotype 4; Ha4) and differs from all so far determined Atractolytocestus haplotypes (Ha1 and Ha2 for A. huronensis; Ha3 for A. sagittatus). Pairwise sequence identity between A. tenuicollis cox1 haplotype and remaining three haplotypes followed the same pattern as in ITS2. The nucleotide and amino acide (aa) sequence comparison with A. huronensis Ha1 and Ha2 revealed higher sequence identity, 90.3-90.8% (96.9% in aa), while lower values were achieved between A. tenuicollis haplotype and Ha3 of Japanese A. sagittatus-75.2 % (81.9 % in aa). The phylogenetic analyses using cox1, ITS2 and combined cox1 + ITS2 sequences revealed close genetic interrelationship between A. tenuicollis and A. huronensis. Independently of a type of analysis and DNA region used, the topology of obtained trees was always identical; A. tenuicollis formed separate clade with A. huronensis forming a closely related sister group.
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