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Qiu Y, Que Y, Ding Z, Zhang S, Wei R, Xia J, Lin Y. Drugs targeting CTGF in the treatment of pulmonary fibrosis. J Cell Mol Med 2024; 28:e18448. [PMID: 38774993 PMCID: PMC11109635 DOI: 10.1111/jcmm.18448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2023] [Revised: 04/23/2024] [Accepted: 05/13/2024] [Indexed: 05/24/2024] Open
Abstract
Pulmonary fibrosis represents the final alteration seen in a wide variety of lung disorders characterized by increased fibroblast activity and the accumulation of substantial amounts of extracellular matrix, along with inflammatory damage and the breakdown of tissue architecture. This condition is marked by a significant mortality rate and a lack of effective treatments. The depositing of an excessive quantity of extracellular matrix protein follows the damage to lung capillaries and alveolar epithelial cells, leading to pulmonary fibrosis and irreversible damage to lung function. It has been proposed that the connective tissue growth factor (CTGF) plays a critical role in the advancement of pulmonary fibrosis by enhancing the accumulation of the extracellular matrix and exacerbating fibrosis. In this context, the significance of CTGF in pulmonary fibrosis is examined, and a summary of the development of drugs targeting CTGF for the treatment of pulmonary fibrosis is provided.
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Affiliation(s)
- Yudan Qiu
- School of PharmacyHangzhou Normal UniversityHangzhouZhejiangChina
- Key Laboratory of Elemene Class Anti‐Cancer Chinese Medicines; Engineering Laboratory of Development and Application of Traditional Chinese Medicines; Collaborative Innovation Center of Traditional Chinese Medicines of Zhejiang ProvinceHangzhou Normal UniversityHangzhouZhejiangChina
| | - Yueyue Que
- School of PharmacyHangzhou Normal UniversityHangzhouZhejiangChina
- Key Laboratory of Elemene Class Anti‐Cancer Chinese Medicines; Engineering Laboratory of Development and Application of Traditional Chinese Medicines; Collaborative Innovation Center of Traditional Chinese Medicines of Zhejiang ProvinceHangzhou Normal UniversityHangzhouZhejiangChina
| | - Zheyu Ding
- School of PharmacyHangzhou Normal UniversityHangzhouZhejiangChina
- Key Laboratory of Elemene Class Anti‐Cancer Chinese Medicines; Engineering Laboratory of Development and Application of Traditional Chinese Medicines; Collaborative Innovation Center of Traditional Chinese Medicines of Zhejiang ProvinceHangzhou Normal UniversityHangzhouZhejiangChina
| | - Shanshan Zhang
- School of PharmacyHangzhou Normal UniversityHangzhouZhejiangChina
- Key Laboratory of Elemene Class Anti‐Cancer Chinese Medicines; Engineering Laboratory of Development and Application of Traditional Chinese Medicines; Collaborative Innovation Center of Traditional Chinese Medicines of Zhejiang ProvinceHangzhou Normal UniversityHangzhouZhejiangChina
| | - Rong Wei
- School of PharmacyHangzhou Normal UniversityHangzhouZhejiangChina
- Key Laboratory of Elemene Class Anti‐Cancer Chinese Medicines; Engineering Laboratory of Development and Application of Traditional Chinese Medicines; Collaborative Innovation Center of Traditional Chinese Medicines of Zhejiang ProvinceHangzhou Normal UniversityHangzhouZhejiangChina
| | - Jianing Xia
- School of PharmacyHangzhou Normal UniversityHangzhouZhejiangChina
- Key Laboratory of Elemene Class Anti‐Cancer Chinese Medicines; Engineering Laboratory of Development and Application of Traditional Chinese Medicines; Collaborative Innovation Center of Traditional Chinese Medicines of Zhejiang ProvinceHangzhou Normal UniversityHangzhouZhejiangChina
| | - Yingying Lin
- School of PharmacyHangzhou Normal UniversityHangzhouZhejiangChina
- Key Laboratory of Elemene Class Anti‐Cancer Chinese Medicines; Engineering Laboratory of Development and Application of Traditional Chinese Medicines; Collaborative Innovation Center of Traditional Chinese Medicines of Zhejiang ProvinceHangzhou Normal UniversityHangzhouZhejiangChina
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2
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Benovics M, Vukić J, Šanda R, Nejat F, Charmpila EA, Buj I, Shumka S, Porcelloti S, Tarkan SA, Aksu S, Emiroğlu O, Šimková A. Monogeneans and chubs: Ancient host-parasite system under the looking glass. Mol Phylogenet Evol 2023; 179:107667. [PMID: 36400419 DOI: 10.1016/j.ympev.2022.107667] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 11/04/2022] [Accepted: 11/10/2022] [Indexed: 11/16/2022]
Abstract
Host-parasite coevolution is one of the fundamentals of evolutionary biology. Due to the intertwined evolutionary history of two interacting species and reciprocal coadaptation processes of hosts and parasites, we can expect that studying parasites will shed more light onto the evolutionary processes of their hosts. Monogenea (ectoparasitic Platyhelminthes) and their cyprinoid fish hosts represent one of the best models for studying host-parasite evolutionary relationships using a cophylogenetic approach. These parasites have developed remarkably high host specificity, where each host species often serves as a potential host for its own host-specific monogenean species. Here, the cophylogenetic relationships in the Dactylogyrus-Squalius system was investigated, as Squalius is one of several cyprinoid genera with puzzling phylogeography and inhabits all four major peri-Mediterranean peninsulas. Of 29 endemic Squalius species examined for the presence of Dactylogyrus parasites, a total of 13 Dactylogyrus species were collected from the gills of 20 Squalius species across a wide range of distribution. Phylogenetic reconstruction revealed a polyphyletic origin for Dactylogyrus species parasitizing congeneric Squalius, with four major clades being recognized. On the basis of the delimitation of host specificity, strict specialists parasitizing single host species, geographic specialists parasitizing congeners in a limited geographical region, and true generalists parasitizing congeners in various geographical regions were recognized in Dactylogyrus species parasitizing Squalius. The phylogenetic reconstruction of Squalius hosts revealed two major clades, the first encompassing only peri-Mediterranean species and the second including species from other Euro-Asian regions. Distance-based cophylogenetic methods did not reveal a statistically significant global cophylogenetic structure in the studied system; however, several host-parasite links among Iberian endemic species contributed significantly to the overall structure. The widest host range and associated genetic variability were recorded for D. folkmanovae, parasitizing nine Squalius species, and D. vistulae, parasitizing 13 Squalius species. Two different dispersion mechanisms and morphological adaptations to Squalius hosts were clearly reflected in the contrasting cophylogenetic patterns for these two species with different levels of host specificity. While host-parasite cospeciation plays an important role in diversification within D. folkmanovae, diversification within D. vistulae is driven mainly by host switching.
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Affiliation(s)
- M Benovics
- Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic; Department of Zoology, Faculty of Natural Sciences, Comenius University in Bratislava, Ilkovičova 6, 842 15 Bratislava, Slovakia.
| | - J Vukić
- Department of Ecology, Faculty of Science, Charles University, Viničná 7, Prague 2 128 44, Czech Republic.
| | - R Šanda
- Department of Ecology, Faculty of Science, Charles University, Viničná 7, Prague 2 128 44, Czech Republic; Department of Zoology, National Museum, Václavské Náměstí 68, Prague 1 110 00, Czech Republic.
| | - F Nejat
- Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic.
| | - E A Charmpila
- Department of Ecology, Faculty of Science, Charles University, Viničná 7, Prague 2 128 44, Czech Republic.
| | - I Buj
- Department of Zoology, Faculty of Science, University of Zagreb, Rooseveltov trg 6, 100 00 Zagreb, Croatia.
| | - S Shumka
- Department of Biotechnology and Food, Faculty of Biotechnology and Food, Agricultural University of Tirana, Tirana, Albania.
| | - S Porcelloti
- Associazione Ichthyos Italia, Via. A Cecchi 12, 52100 Arezzo, Italy.
| | - S A Tarkan
- Faculty of Fisheries, Muğla Sıtkı Koçman University, Menteşe 480 00, Muğla, Turkey; Department of Ecology and Vertebrate Zoology, Faculty of Biology and Environmental Protection, University of Łódź, Łódź, Poland.
| | - S Aksu
- Vocational School of Health Services, Eskişehir Osmangazi University, Büyükdere Meşelik Yerleşkesi, 26040 Eskişehir, Turkey.
| | - O Emiroğlu
- Vocational School of Health Services, Eskişehir Osmangazi University, Büyükdere Meşelik Yerleşkesi, 26040 Eskişehir, Turkey.
| | - A Šimková
- Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic.
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3
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Mendes SL, Machado MP, Coelho MM, Sousa VC. Genomic data and multi-species demographic modelling uncover past hybridization between currently allopatric freshwater species. Heredity (Edinb) 2021; 127:401-412. [PMID: 34462578 PMCID: PMC8478877 DOI: 10.1038/s41437-021-00466-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Revised: 08/05/2021] [Accepted: 08/06/2021] [Indexed: 02/06/2023] Open
Abstract
Evidence for ancient interspecific gene flow through hybridization has been reported in many animal and plant taxa based on genetic markers. The study of genomic patterns of closely related species with allopatric distributions allows the assessment of the relative importance of vicariant isolating events and past gene flow. Here, we investigated the role of gene flow in the evolutionary history of four closely related freshwater fish species with currently allopatric distributions in western Iberian rivers-Squalius carolitertii, S. pyrenaicus, S. torgalensis and S. aradensis-using a population genomics dataset of 23,562 SNPs from 48 individuals, obtained through genotyping by sequencing (GBS). We uncovered a species tree with two well-differentiated clades: (i) S. carolitertii and S. pyrenaicus; and (ii) S. torgalensis and S. aradensis. By using D-statistics and demographic modelling based on the site frequency spectrum, comparing alternative demographic scenarios of hybrid origin, secondary contact and isolation, we found that the S. pyrenaicus North lineage is likely the result of an ancient hybridization event between S. carolitertii (contributing ~84%) and S. pyrenaicus South lineage (contributing ~16%), consistent with a hybrid speciation scenario. Furthermore, in the hybrid lineage, we identify outlier loci potentially affected by selection favouring genes from each parental lineage at different genomic regions. Our results suggest that ancient hybridization can affect speciation and that freshwater fish species currently in allopatry are useful to study these processes.
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Affiliation(s)
- Sofia L. Mendes
- grid.9983.b0000 0001 2181 4263cE3c—Centre for Ecology, Evolution and Environmental Changes, Faculdade de Ciências da Universidade de Lisboa, Lisbon, Portugal
| | - Miguel P. Machado
- grid.9983.b0000 0001 2181 4263cE3c—Centre for Ecology, Evolution and Environmental Changes, Faculdade de Ciências da Universidade de Lisboa, Lisbon, Portugal
| | - Maria M. Coelho
- grid.9983.b0000 0001 2181 4263cE3c—Centre for Ecology, Evolution and Environmental Changes, Faculdade de Ciências da Universidade de Lisboa, Lisbon, Portugal
| | - Vitor C. Sousa
- grid.9983.b0000 0001 2181 4263cE3c—Centre for Ecology, Evolution and Environmental Changes, Faculdade de Ciências da Universidade de Lisboa, Lisbon, Portugal
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4
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Perea S, Sousa‐Santos C, Robalo J, Doadrio I. Historical biogeography of the Iberian Peninsula: multilocus phylogeny and ancestral area reconstruction for the freshwater fish genus
Squalius
(Actinopterygii, Leuciscidae). J ZOOL SYST EVOL RES 2021. [DOI: 10.1111/jzs.12464] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Silvia Perea
- Museo Nacional de Ciencias Naturales, Biodiversity and Evolutionary Department Madrid Spain
| | - Carla Sousa‐Santos
- MARE – Marine and Environmental Sciences Centre ISPA‐Instituto Universitário Lisbon Portugal
| | - Joana Robalo
- MARE – Marine and Environmental Sciences Centre ISPA‐Instituto Universitário Lisbon Portugal
| | - Ignacio Doadrio
- Museo Nacional de Ciencias Naturales, Biodiversity and Evolutionary Department Madrid Spain
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5
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Moreno JM, Jesus TF, Coelho MM, Sousa VC. Adaptation and convergence in circadian-related genes in Iberian freshwater fish. BMC Ecol Evol 2021; 21:38. [PMID: 33685402 PMCID: PMC7941933 DOI: 10.1186/s12862-021-01767-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Accepted: 02/16/2021] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND The circadian clock is a biological timing system that improves the ability of organisms to deal with environmental fluctuations. At the molecular level it consists of a network of transcription-translation feedback loops, involving genes that activate (bmal and clock - positive loop) and repress expression (cryptochrome (cry) and period (per) - negative loop). This is regulated by daily alternations of light but can also be affected by temperature. Fish, as ectothermic, depend on the environmental temperature and thus are good models to study its integration within the circadian system. Here, we studied the molecular evolution of circadian genes in four Squalius freshwater fish species, distributed across Western Iberian rivers affected by two climatic types with different environmental conditions (e.g., light and temperature). S. carolitertii and S. pyrenaicus inhabit the colder northern region under Atlantic climate type, while S. torgalensis, S. aradensis and some populations of S. pyrenaicus inhabit the warmer southern region affected by summer droughts, under Mediterranean climate type. RESULTS We identified 16 circadian-core genes in the Squalius species using a comparative transcriptomics approach. We detected evidence of positive selection in 12 of these genes using methods based on dN/dS. Positive selection was mainly found in cry and per genes of the negative loop, with 55 putatively adaptive substitutions, 16 located on protein domains. Evidence for positive selection is predominant in southern populations affected by the Mediterranean climate type. By predicting protein features we found that changes at sites under positive selection can impact protein thermostability by changing their aliphatic index and isoelectric point. Additionally, in nine genes, the phylogenetic clustering of species that belong to different clades but inhabit southern basins with similar environmental conditions indicated evolutionary convergence. We found evidence for increased nonsynonymous substitution rate in convergent lineages, likely due to positive selection at 27 sites, mostly in cry genes. CONCLUSIONS Our results support that temperature may be a selective pressure driving the evolution of genes involved in the circadian system. By integrating sequence-based functional protein prediction with dN/dS-based methods to detect selection we uncovered adaptive convergence in the southern populations, probably related to their similar thermal conditions.
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Affiliation(s)
- João M Moreno
- cE3c - Centre for Ecology, Evolution and Environmental Changes, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016, Lisboa, Portugal
| | - Tiago F Jesus
- cE3c - Centre for Ecology, Evolution and Environmental Changes, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016, Lisboa, Portugal
| | - Maria M Coelho
- cE3c - Centre for Ecology, Evolution and Environmental Changes, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016, Lisboa, Portugal
| | - Vitor C Sousa
- cE3c - Centre for Ecology, Evolution and Environmental Changes, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016, Lisboa, Portugal.
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6
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Perea S, Sousa‐Santos C, Robalo J, Doadrio I. Multilocus phylogeny and systematics of Iberian endemicSqualius(Actinopterygii, Leuciscidae). ZOOL SCR 2020. [DOI: 10.1111/zsc.12420] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Silvia Perea
- Department of Biodiversity and Evolutionary Biology Museo Nacional de Ciencias Naturales - CSIC Madrid Spain
| | - Carla Sousa‐Santos
- MARE – Marine and Environmental Sciences Centre ISPA‐Instituto Universitário Lisbon Portugal
| | - Joana Robalo
- MARE – Marine and Environmental Sciences Centre ISPA‐Instituto Universitário Lisbon Portugal
| | - Ignacio Doadrio
- Department of Biodiversity and Evolutionary Biology Museo Nacional de Ciencias Naturales - CSIC Madrid Spain
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7
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High diversity of fish ectoparasitic monogeneans ( Dactylogyrus) in the Iberian Peninsula: a case of adaptive radiation? Parasitology 2020; 147:418-430. [PMID: 31965950 DOI: 10.1017/s0031182020000050] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The epicontinental fauna of the Iberian Peninsula is strongly influenced by its geographical history. As the possibilities for dispersion of organisms into and from this region were (and still are) limited, the local fauna consists almost exclusively of endemic species. Almost all Iberian freshwater fishes of the families Leuciscidae and Cyprinidae are endemic and on-going research on these taxa continually uncovers new species. Nevertheless, information on their host-specific parasites remains scarce. In this study, we investigate the diversity and phylogenetic relationships in monogeneans of the genus Dactylogyrus (gill ectoparasites specific to cyprinoid fish) in the Iberian Peninsula. Twenty-two species were collected and identified from 19 host species belonging to Cyprinidae and Leuciscidae. A high degree of endemism was observed, with 21 Dactylogyrus species reported from Iberia only and a single species, D. borealis, also reported from other European regions. Phylogenetic analysis split the endemic Iberian Dactylogyrus into two well-supported clades, the first encompassing Dactylogyrus parasitizing endemic Luciobarbus spp. only, and the second including all Dactylogyrus species of endemic leuciscids and four species of endemic cyprinids. Species delimitation analysis suggests a remarkable diversity and existence of a multitude of cryptic Dactylogyrus species parasitizing endemic leuciscids (Squalius spp. and representatives of Chondrostoma s.l.). These results suggest a rapid adaptive radiation of Dactylogyrus in this geographically isolated region, closely associated with their cyprinoid hosts. Moreover, phylogenetic analysis supports that Dactylogyrus parasites colonized the Iberian Peninsula through multiple dispersion events.
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8
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Sousa-Santos C, Jesus TF, Fernandes C, Robalo JI, Coelho MM. Fish diversification at the pace of geomorphological changes: evolutionary history of western Iberian Leuciscinae (Teleostei: Leuciscidae) inferred from multilocus sequence data. Mol Phylogenet Evol 2018; 133:263-285. [PMID: 30583043 DOI: 10.1016/j.ympev.2018.12.020] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Revised: 12/12/2018] [Accepted: 12/15/2018] [Indexed: 01/05/2023]
Abstract
The evolutionary history of western Iberian Leuciscinae, obligatory freshwater fish, is directly linked to the evolution of the hydrographic network of the Iberian Peninsula after its isolation from the rest of Europe, which involved dramatic rearrangements such as the transition from endorheic lakes to open basins draining to the Atlantic. Previous phylogenetic research on western Iberian leuciscines, using mainly mitochondrial DNA and more recently one or two nuclear genes, has found contradictory results and there remain many unresolved issues regarding species relationships, taxonomy, and evolutionary history. Moreover, there is a lack of integration between phylogenetic and divergence time estimates and information on the timing of geomorphological changes and paleobasin rearrangements in the Iberian Peninsula. This study presents the first comprehensive fossil-calibrated multilocus coalescent species tree of western Iberian Leuciscinae (including 14 species of Achondrostoma, Iberochondrostoma, Pseudochondrostoma and Squalius endemic to the Iberian Peninsula, seven of which endemic to Portugal) based on seven nuclear genes, and from which we infer their biogeographic history by comparing divergence time estimates to known dated geological events. The phylogenetic pattern suggests slow-paced evolution of leuciscines during the Early-Middle Miocene endorheic phase of the main Iberian river basins, with the shift to exorheism in the late Neogene-Quaternary allowing westward dispersals that resulted in many cladogenetic events and a high rate of endemism in western Iberia. The results of this study also: (i) confirm the paraphyly of S. pyrenaicus with respect to S. carolitertii, and thus the possible presence of a new taxon in the Portuguese Tagus currently assigned to S. pyrenaicus; (ii) support the taxonomic separation of the Guadiana and Sado populations of S. pyrenaicus; (iii) show the need for further population sampling and taxonomic research to clarify the phylogenetic status of A. arcasii from the Minho basin and of the I. lusitanicum populations in the Sado and Tagus basins; and (iv) indicate that A. occidentale, I. olisiponensis and P. duriensis are the most ancient lineages within their respective genera.
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Affiliation(s)
- C Sousa-Santos
- MARE - Marine and Environmental Sciences Centre, ISPA-Instituto Universitário, Rua Jardim do Tabaco 34, 1149-041 Lisbon, Portugal.
| | - T F Jesus
- cE3c - Center for Ecology, Evolution and Environmental Changes, Departamento de Biologia Animal, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, 1749-016 Lisbon, Portugal; Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina da Universidade de Lisboa, Av. Professor Egaz Moniz, 1649-028 Lisbon, Portugal(2).
| | - C Fernandes
- cE3c - Center for Ecology, Evolution and Environmental Changes, Departamento de Biologia Animal, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, 1749-016 Lisbon, Portugal.
| | - J I Robalo
- MARE - Marine and Environmental Sciences Centre, ISPA-Instituto Universitário, Rua Jardim do Tabaco 34, 1149-041 Lisbon, Portugal.
| | - M M Coelho
- cE3c - Center for Ecology, Evolution and Environmental Changes, Departamento de Biologia Animal, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, 1749-016 Lisbon, Portugal.
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Aboim MA, Mesquita N, Drago M, Coelho MM, Alves MJ. Assessing inter-drainage connections: patterns of genetic diversity in an Iberian cyprinid fish. Biol J Linn Soc Lond 2013. [DOI: 10.1111/bij.12059] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Maria Ana Aboim
- Centro de Biologia Ambiental, Faculdade de Ciências; Universidade de Lisboa; 1749-016; Lisboa; Portugal
| | | | | | - Maria Manuela Coelho
- Centro de Biologia Ambiental, Faculdade de Ciências; Universidade de Lisboa; 1749-016; Lisboa; Portugal
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10
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Nabais C, Rampin M, Collares-Pereira MJ. Comparative cytogenetics of two endangered leuciscine fish, Squalius aradensis and S. torgalensis (Teleostei, Cyprinidae), from the Iberian Peninsula. COMPARATIVE CYTOGENETICS 2013; 7:33-42. [PMID: 24260688 PMCID: PMC3833748 DOI: 10.3897/compcytogen.v7i1.4672] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/12/2013] [Accepted: 02/14/2013] [Indexed: 06/02/2023]
Abstract
In this study, the description of the karyotypes of the endangered chubs Squalius aradensis (Coelho, Bogutskaya, Rodrigues and Collares-Pereira, 1998) and Squalius torgalensis (Coelho, Bogutskaya, Rodrigues and Collares-Pereira, 1998) is presented by means of conventional (Giemsa-staining, Chromomycin A3 (CMA3)-fluorescence, Silver-impregnation (Ag-NORs)) and molecular (fluorescence in situ hybridization (FISH) with 18S rDNA probe) protocols. These endemic sister-species have an allopatric but adjacent distribution in the most southwestern part of the Iberian Peninsula. Diploid chromosome number was invariably 2n = 50 and karyotypes of both species were grossly similar, composed of metacentric and submetacentric elements with a reduced number of acrocentric pairs. Sequential staining using FISH with an 18S rDNA probe, CMA3 and Ag-NORs treatments revealed consistent positive signals located at the end of the short arms of a submetacentric chromosome pair, likely homologous in both species. While providing useful cytogenetic comparative data against other members of the genus Squalius Bonaparte, 1837, the work aimed to draw attention towards the conservation of two narrow-range and highly confined fish species.
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Affiliation(s)
- Catarina Nabais
- Universidade de Lisboa, Faculdade de Ciências, Centro de Biologia Ambiental, Campo Grande, Lisboa, Portugal
| | - Massimiliano Rampin
- Universidade de Lisboa, Faculdade de Ciências, Centro de Biologia Ambiental, Campo Grande, Lisboa, Portugal
- Present address: University of South Bohemia in České Budějovice, Faculty of Fisheries and Protection of Waters, Research Institute of Fish Culture and Hydrobiology, Vodňany, Czech Republic
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