Abstract
Background
Interspecific hybrids of rohu (Labeo rohita) and catla (Labeo catla) are common, especially in India due to constrained breeding. These hybrids must segregate from their wild parents as part of conservational strategies. This study intended to screen the hybrids from wild rohu and catla parents using both morphometric and molecular approaches.
Methods & Results
The carp samples were collected from Jharkhand and West Bengal, India. The correlation and regression analysis of morphometric features are considered superficial but could be protracted statistically by clustering analysis and further consolidated by nucleotide variations of one mitochondrial and one nuclear gene to differentiate hybrids from their parents. Out of 21 morphometric features, 6 were used for clustering analysis that exhibited discrete separation among rohu, catla, and their hybrids when the data points were plotted in a low-dimensional 2-D plane using the first 2 principal components. Out of 40 selected single nucleotide polymorphism (SNP) positions of the COX1 gene, hybrid showed 100% similarity with catla. Concerning SNP similarity of the 18S rRNA nuclear gene, the hybrid showed 100% similarity with rohu but not with catla; exhibiting its probable parental inheritance.
Conclusions
Along with morphometric analysis, the SNP comparison study together points towards strong evidence of interspecific hybridization between rohu and catla, as these hybrids share both morphological and molecular differences with either parent. However, this study will help screen the hybrids from their wild parents, as a strategy for conservational management.
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Data availability
Generated fish DNA sequences were submitted to GenBank of NCBI and accession numbers were mentioned in the manuscript. A total of 8 DNA sequence accession numbers were mentioned: PP291954, PP291970, PP292005, and PP292006 for COX1 of wild rohu, wild catla, and their 2 hybrids respectively. Another 4 accession numbers were for 18S rRNA DNA sequences like PP296552, PP296554, PP296553, and PP296690 of wild rohu, wild catla, and their 2 hybrids respectively.
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Acknowledgements
This work has been supported by Dr. Shyama Prasad Mukherjee University, Ranchi, Jharkhand by giving working space and providing computer and internet facilities. SG is indebted to Mr. Vineet Vishal for his valuable suggestions on bioinformatics. SG is also thankful to Mr. Vivekananda Mahato for his help in collecting fish samples from Purulia and Ranchi districts. All the authors are indebted to Dr. Surojit Dutta of the GIS department of DSPMU for preparing a GIS map of the areas from where the fish were collected.
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NS and PL of Dr. Shyama Prasad Mukherjee University were equally involved in making substantial contributions to the design of the work, sample collection, genomic DNA isolation from the same, and interpretation of data. DG of Temple University, USA statistically interpreted, analyzed, and designed the theoretical framework of the manuscript. SG of Dr. Shyama Prasad Mukherjee University drafted the work and with the help of PM from Birsa Agricultural University revised it critically. All authors approved the version of the manuscript to be published and agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.
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This study did not involve either human participants or higher vertebrates or even any living specimens but rather based on dead edible fish sampled from the fish market. So, there is no need for an ethical approval.
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Lenka, P., Singh, N., Ghosh, D. et al. Integrated morphometric and molecular approaches to screen hybrid from wild Labeo rohita and Labeo catla parent populations. Mol Biol Rep 51, 738 (2024). https://doi.org/10.1007/s11033-024-09610-6
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DOI: https://doi.org/10.1007/s11033-024-09610-6