Dorsal fin development in flounder, Paralichthys olivaceus : Bud formation and its cellular origin

Chen, Jie; Liu, Xiaoyu; Yao, Xiaohua; Gao, Fei; Bao, Baolong

doi:10.1016/j.gep.2017.04.003

“…The alterations in hoxd12a were believed to account for the forelimb (homologs of teleost fins) reorganization in cetaceans 103 and paired fin degeneration in lungfishes 104 . Furthermore, hoxd12a has also been implicated in dorsal fin development in flounders 105 . The observed mutations in hoxd12a may have implications for the morphological changes of median and paired fins in RFP (Supplementary Table 97 and Supplementary Note 21 ), although the causative effect of these mutations still awaits further verification.…”

Section: Resultsmentioning

confidence: 99%

Large-scale sequencing of flatfish genomes provides insights into the polyphyletic origin of their specialized body plan

Lü

¹

,

Gong

²

,

Ren

³

et al. 2021

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The evolutionary and genetic origins of the specialized body plan of flatfish are largely unclear. We analyzed the genomes of 11 flatfish species representing 9 of the 14 Pleuronectiforme families and conclude that Pleuronectoidei and Psettodoidei do not form a monophyletic group, suggesting independent origins from different percoid ancestors. Genomic and transcriptomic data indicate that genes related to WNT and retinoic acid pathways, hampered musculature and reduced lipids might have functioned in the evolution of the specialized body plan of Pleuronectoidei. Evolution of Psettodoidei involved similar but not identical genes. Our work provides valuable resources and insights for understanding the genetic origins of the unusual body plan of flatfishes.

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“…Fin positioning depends upon several processes: genes expressed in the mesoderm (either lateral plate 45 or paraxial 46, 47 ) establish the fin territory, cells in this territory can migrate and contract asymmetrically to form a mysenchymal bud 48 , and differential growth of the trunk and fin can affect its eventual adult position 26, 49, 50 . Some adipose fins appear to be positioned by an additional mechanism: differential patterns of apoptosis within the LMFF.…”

Section: Discussionmentioning

confidence: 99%

Adipose fin development and its relation to the evolutionary origins of median fins

Stewart

¹

,

Ho

²

,

Hale

³

2018

Preprint

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The dorsal, anal and caudal fins of vertebrates are proposed to have originated by the partitioning and transformation of the continuous median fin fold that is plesiomorphic to chordates. Evaluating this hypothesis has been challenging, because it is unclear how the median fin fold relates to the adult median fins of vertebrates. To understand how new median fins originate, here we study the development and diversity of adipose fins. Phylogenetic mapping shows that in all lineages except Characoidei (Characiformes) adipose fins develop from a domain of the larval median fin fold. To inform how the larva’s median fin fold contributes to the adipose fin, we study Corydoras aeneus (Siluriformes). As the fin fold reduces around the prospective site of the adipose fin, a fin spine develops in the fold, growing both proximally and distally, and sensory innervation, which appears to originate from the recurrent ramus of the facial nerve and from dorsal rami of the spinal cord, develops in the adipose fin membrane. Collectively, these data show how a plesiomorphic median fin fold can serve as scaffolding for the evolution and development of novel, individuated median fins, consistent with the median fin fold hypothesis.

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“…Fin positioning depends upon several processes: genes expressed in the mesoderm (either lateral plate 47 or paraxial 23,48 ) establish the fin territory, cells in this territory can migrate and contract asymmetrically to form a mysenchymal bud 49 , and differential growth of the trunk and fin can affect its eventual adult position 27,50,51 . Some adipose fins appear to be positioned by an additional mechanism: differential patterns of apoptosis within the LMFF.…”

Section: Discussionmentioning

confidence: 99%

Adipose fin development and its relation to the evolutionary origins of median fins

Stewart

¹

,

Bonilla

²

,

Ho

³

et al. 2019

Sci Rep

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The dorsal, anal and caudal fins of vertebrates are proposed to have originated by the partitioning and transformation of the continuous median fin fold that is plesiomorphic to chordates. Evaluating this hypothesis has been challenging, because it is unclear how the median fin fold relates to the adult median fins of vertebrates. To understand how new median fins originate, here we study the development and diversity of adipose fins. Phylogenetic mapping shows that in all lineages except Characoidei (Characiformes) adipose fins develop from a domain of the larval median fin fold. To inform how the larva’s median fin fold contributes to the adipose fin, we study Corydoras aeneus (Siluriformes). As the fin fold reduces around the prospective site of the adipose fin, a fin spine develops in the fold, growing both proximally and distally, and sensory innervation, which appears to originate from the recurrent ramus of the facial nerve and from dorsal rami of the spinal cord, develops in the adipose fin membrane. Collectively, these data show how a plesiomorphic median fin fold can serve as scaffolding for the evolution and development of novel, individuated median fins, consistent with the median fin fold hypothesis.

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Dorsal fin development in flounder, Paralichthys olivaceus : Bud formation and its cellular origin

Cited by 8 publications

References 43 publications

Large-scale sequencing of flatfish genomes provides insights into the polyphyletic origin of their specialized body plan

Large-scale sequencing of flatfish genomes provides insights into the polyphyletic origin of their specialized body plan

Adipose fin development and its relation to the evolutionary origins of median fins

Adipose fin development and its relation to the evolutionary origins of median fins

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