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Funk EC, Breen C, Sanketi BD, Kurpios N, McCune A. Changes in Nkx2.1, Sox2, Bmp4, and Bmp16 expression underlying the lung-to- gas bladder evolutionary transition in ray-finned fishes. Evol Dev 2021; 22:384-402. [PMID: 33463017 DOI: 10.1111/ede.12354] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 06/05/2020] [Accepted: 08/28/2020] [Indexed: 02/06/2023]
Abstract
The key to understanding the evolutionary origin and modification of phenotypic traits is revealing the responsible underlying developmental genetic mechanisms. An important organismal trait of ray-finned fishes is the gas bladder, an air-filled organ that, in most fishes, functions for buoyancy control, and is homologous to the lungs of lobe-finned fishes. The critical morphological difference between lungs and gas bladders, which otherwise share many characteristics, is the general direction of budding during development. Lungs bud ventrally and the gas bladder buds dorsally from the anterior foregut. We investigated the genetic underpinnings of this ventral-to-dorsal shift in budding direction by studying the expression patterns of known lung genes (Nkx2.1, Sox2, and Bmp4) during the development of lungs or gas bladder in three fishes: bichir, bowfin, and zebrafish. Nkx2.1 and Sox2 show reciprocal dorsoventral expression patterns during tetrapod lung development and are important regulators of lung budding; their expression during bichir lung development is conserved. Surprisingly, we find during gas bladder development, Nkx2.1 and Sox2 expression are inconsistent with the hypothesis that they regulate the direction of gas bladder budding. Bmp4 is expressed ventrally during lung development in bichir, akin to the pattern during mouse lung development. During gas bladder development, Bmp4 is not expressed. However, Bmp16, a paralogue of Bmp4, is expressed dorsally in the developing gas bladder of bowfin. Bmp16 is present in the known genomes of Actinopteri (ray-finned fishes excluding bichir) but absent from mammalian genomes. We hypothesize that Bmp16 was recruited to regulate gas bladder development in the Actinopteri in place of Bmp4.
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Affiliation(s)
- Emily C Funk
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, New York, USA.,Animal Science Department, Genomic Variation Lab, University of California Davis, Davis, California, USA
| | - Catriona Breen
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, New York, USA
| | - Bhargav D Sanketi
- Department of Molecular Medicine, Veterinary Medical Center, Cornell University, Ithaca, New York, USA
| | - Natasza Kurpios
- Department of Molecular Medicine, Veterinary Medical Center, Cornell University, Ithaca, New York, USA
| | - Amy McCune
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, New York, USA
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2
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Funk EC, Birol EB, McCune AR. Does the bowfin gas bladder represent an intermediate stage during the lung-to-gas bladder evolutionary transition? J Morphol 2021; 282:600-611. [PMID: 33538055 DOI: 10.1002/jmor.21330] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Revised: 01/27/2021] [Accepted: 02/01/2021] [Indexed: 11/09/2022]
Abstract
Whether phenotypic evolution occurs gradually through time has prompted the search for intermediate forms between the ancestral and derived states of morphological features, especially when there appears to be a discontinuous origin. The gas bladder, a derived character of the Actinopteri, is a modification of lungs, which characterize the common ancestor of bony vertebrates. While gas bladders and lungs are similar in many ways, the key morphological difference between these organs is the direction of budding from the foregut during development; essentially, the gas bladder buds dorsally and the lungs bud ventrally from the foregut. Did the shift from ventral lungs to dorsal gas bladder transition through a lateral-budding stage? To answer this question, the precise location of budding during gas bladder development in bowfin, representing the sister lineage to teleosts, has been debated. In the early 20th-century, it was suggested that the bowfin gas bladder buds laterally from the right wall of the foregut. We used nano-CT scanning to visualize the early development of the bowfin gas bladder to verify the historical studies of gas bladder developmental morphology and determine whether the direction of gas bladder budding in bowfin could be intermediate between ventrally budding lungs and dorsally budding gas bladders. We found that the bowfin gas bladder buds dorsally from the anterior foregut; however, during early development, the posterior gas bladder twists right. As development progresses, the posterior, right-hand twist becomes shallower, and the gas bladder itself shifts toward a mid-dorsal position. The budding site is definitively dorsal, despite the temporary lateral twist of the posterior gas bladder.
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Affiliation(s)
- Emily C Funk
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, New York, USA.,Genomics Variation Lab, University of California Davis, Davis, California, USA
| | - Eda B Birol
- Department of Architecture, Cornell University, Ithaca, New York, USA
| | - Amy R McCune
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, New York, USA
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Liggan LM, Martone PT. Gas Composition of Developing Pneumatocysts in Bull Kelp Nereocystis luetkeana (Phaeophyceae) 1. J Phycol 2020; 56:1367-1372. [PMID: 32479662 DOI: 10.1111/jpy.13037] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Accepted: 05/17/2020] [Indexed: 06/11/2023]
Abstract
The subtidal kelp Nereocystis luetkeana (hereafter Nereocystis) maintains an upright stature by producing a single gas-filled float (pneumatocyst) that provides buoyancy. The ability of Nereocystis pneumatocysts to inflate with gas underwater is peculiar, and the gas composition of pneumatocysts has been the topic of several studies over the last 100 years. Past studies of pneumatocyst gases only examined large sporophytes, leaving open questions about the origins of these gases and how gas composition may change during development. In this study, we use developmental time as a means to understand the origin and physiological mechanisms that give rise to different gases within Nereocystis pneumatocysts. Total gas composition was measured across a range of pneumatocyst sizes (5-725 mL). Contrary to previous studies that documented pneumatocyst gas concentrations to be similar to air, this study found internal gas levels of CO, CO2 , and O2 to be 1.2 ± 0.8%, 0.6 ± 0.2%, and 59.9 ± 13.6%, respectively. Our data suggest that the composition of gases does not change as pneumatocysts grow and that the rate of each gas added is approximately proportional to changes in pneumatocyst volume. Therefore, cells constituting the pneumatocyst wall are likely producing more gas (per surface area) to fill pneumatocysts as they expand, maintaining proportional gas composition and corresponding internal pressure.
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Affiliation(s)
- Lauran M Liggan
- Department of Botany and Biodiversity Research Centre, University of British Columbia, 3529-6270 University Blvd, Vancouver, BC, V6T 1Z4, Canada
| | - Patrick T Martone
- Department of Botany and Biodiversity Research Centre, University of British Columbia, 3529-6270 University Blvd, Vancouver, BC, V6T 1Z4, Canada
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Funk E, Lencer E, McCune A. Dorsoventral inversion of the air-filled organ (lungs, gas bladder) in vertebrates: RNAsequencing of laser capture microdissected embryonic tissue. J Exp Zool B Mol Dev Evol 2020; 334:325-338. [PMID: 32864827 PMCID: PMC8094346 DOI: 10.1002/jez.b.22998] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 08/04/2020] [Accepted: 08/07/2020] [Indexed: 12/20/2022]
Abstract
How modification of gene expression generates novel traits is key to understanding the evolutionary process. We investigated the genetic basis for the origin of the piscine gas bladder from lungs of ancestral bony vertebrates. Distinguishing these homologous organs is the direction of budding from the foregut during development; lungs bud ventrally and the gas bladder buds dorsally.
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Affiliation(s)
- Emily Funk
- Cornell University, Department of Ecology and Evolutionary Biology, 215 Tower Rd, Ithaca, NY 14853
- University of California Davis, Genomic Variation Lab, Animal Science Department, 2235 Meyer Hall, Davis, CA 95616
| | - Ezra Lencer
- University of Colorado Denver - Anschutz Medical Campus, Department of Craniofacial Biology, 12081 East 17 Ave, RC 1 South, Campus Box 8120, Aurora, CO 80045
| | - Amy McCune
- Cornell University, Department of Ecology and Evolutionary Biology, 215 Tower Rd, Ithaca, NY 14853
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5
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Liggan LM, Martone PT. Under pressure: biomechanical limitations of developing pneumatocysts in the bull kelp (Nereocystis luetkeana, Phaeophyceae). J Phycol 2018; 54:608-615. [PMID: 30098020 DOI: 10.1111/jpy.12776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Accepted: 07/16/2018] [Indexed: 06/08/2023]
Abstract
Maintaining buoyancy with gas-filled floats (pneumatocysts) is essential for some subtidal kelps to achieve an upright stature and compete for light . However, as these kelps grow up through the water column, pneumatocysts are exposed to substantial changes in hydrostatic pressure, which could cause complications as internal gases may expand or contract, potentially causing them to rupture, flood, and lose buoyancy. In this study, we investigate how pneumatocysts of Nereocystis luetkeana resist biomechanical stress and maintain buoyancy as they develop across a hydrostatic gradient. We measured internal pressure, material properties, and pneumatocyst geometry across a range of thallus sizes and collection depths to identify strategies used to resist pressure-induced mechanical failure. Contrary to expectations, all pneumatocysts had internal pressures less than atmospheric pressure, ensuring that thalli are always exposed to a positive pressure gradient and compressional loads, indicating that they are more likely to buckle than rupture at all depths. Small pneumatocysts collected from depths between 1 and 9 m (inner radius = 0.4-1.0 cm) were demonstrated to have elevated wall stresses under high compressive loads and are at greatest risk of buckling. Although small kelps do not adjust pneumatocyst material properties or geometry to reduce wall stress as they grow, they are ~3.4 times stronger than they need to be to resist hydrostatic buckling. When tested, pneumatocysts buckled around 35 m depth, which agrees with previous measures of lower limits due to light attenuation, suggesting that hydrostatic pressure may also define the lower limit of Nereocystis in the field.
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Affiliation(s)
- Lauran M Liggan
- Department of Botany and Beaty Biodiversity Research Centre, University of British Columbia, Vancouver, British Columbia, Canada, V6T1Z4
- Bamfield Marine Sciences Centre, 100 Pachena Road, Bamfield, British Columbia, Canada, V0R1B0
| | - Patrick T Martone
- Department of Botany and Beaty Biodiversity Research Centre, University of British Columbia, Vancouver, British Columbia, Canada, V6T1Z4
- Bamfield Marine Sciences Centre, 100 Pachena Road, Bamfield, British Columbia, Canada, V0R1B0
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Mohr RA, Whitchurch EA, Anderson RD, Forlano PM, Fay RR, Ketten DR, Cox TC, Sisneros JA. Intra- and Intersexual swim bladder dimorphisms in the plainfin midshipman fish (Porichthys notatus): Implications of swim bladder proximity to the inner ear for sound pressure detection. J Morphol 2017; 278:1458-1468. [PMID: 28691340 DOI: 10.1002/jmor.20724] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Revised: 05/17/2017] [Accepted: 06/20/2017] [Indexed: 11/11/2022]
Abstract
The plainfin midshipman fish, Porichthys notatus, is a nocturnal marine teleost that uses social acoustic signals for communication during the breeding season. Nesting type I males produce multiharmonic advertisement calls by contracting their swim bladder sonic muscles to attract females for courtship and spawning while subsequently attracting cuckholding type II males. Here, we report intra- and intersexual dimorphisms of the swim bladder in a vocal teleost fish and detail the swim bladder dimorphisms in the three sexual phenotypes (females, type I and II males) of plainfin midshipman fish. Micro-computerized tomography revealed that females and type II males have prominent, horn-like rostral swim bladder extensions that project toward the inner ear end organs (saccule, lagena, and utricle). The rostral swim bladder extensions were longer, and the distance between these swim bladder extensions and each inner-ear end organ type was significantly shorter in both females and type II males compared to that in type I males. Our results revealed that the normalized swim bladder length of females and type II males was longer than that in type I males while there was no difference in normalized swim bladder width among the three sexual phenotypes. We predict that these intrasexual and intersexual differences in swim bladder morphology among midshipman sexual phenotypes will afford greater sound pressure sensitivity and higher frequency detection in females and type II males and facilitate the detection and localization of conspecifics in shallow water environments, like those in which midshipman breed and nest.
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Affiliation(s)
- Robert A Mohr
- Department of Psychology, University of Washington, Seattle, Washington, 98195-1525
| | | | - Ryan D Anderson
- Center for Developmental Biology & Regenerative Medicine, Seattle Children's Research Institute, Seattle, Washington, 98101
| | - Paul M Forlano
- Department of Biology, Brooklyn College, and The Graduate Center, City University of New York, Brooklyn, New York, 11210
| | - Richard R Fay
- Marine Biological Laboratory, Woods Hole, Massachusetts, 02543
| | - Darlene R Ketten
- Boston University, Biomedical Engineering (Hearing Research Center) and Harvard Medical School, Otology and Laryngology, Boston, Massachusetts, 02115.,Biology Department, Wood Hole Oceanographic Institution, Woods Hole, Massachusetts, 02543
| | - Timothy C Cox
- Center for Developmental Biology & Regenerative Medicine, Seattle Children's Research Institute, Seattle, Washington, 98101.,Department of Pediatrics (Craniofacial Medicine), University of Washington, Seattle, Washington, 98195.,Department of Anatomy and Developmental Biology, Monash University, Clayton, Victoria, 3800, Australia
| | - Joseph A Sisneros
- Department of Psychology, University of Washington, Seattle, Washington, 98195-1525.,Department of Biology, University of Washington, Seattle, Washington, 98195.,Virginia Merrill Bloedel Hearing Research Center, Seattle, Washington, 98195
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Chanet B, Guintard C, Lecointre G. The gas bladder of puffers and porcupinefishes (Acanthomorpha: Tetraodontiformes): phylogenetic interpretations. J Morphol 2014; 275:894-901. [PMID: 24634057 DOI: 10.1002/jmor.20266] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Revised: 01/17/2014] [Accepted: 02/21/2014] [Indexed: 11/10/2022]
Abstract
The anatomy of the gas bladder of Diodontidae (porcupinefishes) and Tetraodontidae (pufferfishes) was studied on the basis of dissections and magnetic resonance imaging. Among the examined taxa of Tetraodontiformes, only puffers and porcupinefishes possess a thick walled and dorsally U-shaped or crescent-moon-shaped gas bladder. In the tetraodontid genus Lagocephalus the gas bladder is reduced to a rudiment. The species belonging to the genera Canthigaster, Arothron, and some species of Tetraodon differ in the positioning of their crescent-moon-shaped gas bladder. These observations confirm the close relationship of: (i) Diodontidae and Tetraodontidae and (ii) Canthigaster, Arothron, and some species of Tetraodon. The heterogeneity of the genus Tetraodon is supported by the gas bladder morphology, as previously suggested by molecular studies.
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Affiliation(s)
- Bruno Chanet
- Département Systématique et Evolution, ISYEB, UMR 7205 CNRS-MNHN-UPMC-EPHE, Muséum national d'Histoire naturelle, CP 50, 57 rue Cuvier, 75005, Paris, France
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