1
|
Zheng J, Zhang Z, Zhang N, Liang Y, Gong Z, Wang J, Ditta A, Sang Z, Wang J, Li X. Identification and function analysis of GABA branch three gene families in the cotton related to abiotic stresses. BMC PLANT BIOLOGY 2024; 24:57. [PMID: 38238675 PMCID: PMC10797812 DOI: 10.1186/s12870-024-04738-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 01/09/2024] [Indexed: 01/22/2024]
Abstract
γ -aminobutyric acid (GABA) is closely related to the growth, development and stress resistance of plants. Combined with the previous study of GABA to promote the cotton against abiotic stresses, the characteristics and expression patterns of GABA branch gene family laid the foundation for further explaining its role in cotton stress mechanism. Members of GAD, GAB-T and SSADH (three gene families of GABA branch) were identified from the Gossypium hirsutum, Gossypium barbadense, Gossypium arboreum and Gossypium raimondii genome. The GABA branch genes were 10 GAD genes, 4 GABA-T genes and 2 SSADH genes. The promoter sequences of genes mainly contains response-related elements such as light, hormone and environment.Phylogenetic analysis shows that GAD indicating that even in the same species, the homologous sequences in the family. The GABA-T gene of each cotton genus was in sum the family had gene loss in the process of dicotyledon evolution. SSADH families Gossypium hirsutum, Gossypium barbadense, Gossypium arboreum and Gossypium raimondii were closely related to the dicot plants.GABA gene is involved in the regulation of salt stress and high temperature in Gossypium hirsutum.GABA attenuated part of the abiotic stress damage by increasing leaf protective enzyme activity and reducing reactive oxygen species production.This lays the foundation for a thorough analysis of the mechanism of GABA in cotton stress resistance.
Collapse
Grants
- 2022YFD1200304-4 National key R&D Program of China
- 2022YFD1200304-4 National key R&D Program of China
- 2022YFD1200304-4 National key R&D Program of China
- 2022YFD1200304-4 National key R&D Program of China
- 2022YFD1200304-4 National key R&D Program of China
- 2022D01E20 Natural Science Foundation for Distinguished Young Scholars of Xinjiang Province, China
- 2022D01E20 Natural Science Foundation for Distinguished Young Scholars of Xinjiang Province, China
- 2022D01E20 Natural Science Foundation for Distinguished Young Scholars of Xinjiang Province, China
- 2022D01E20 Natural Science Foundation for Distinguished Young Scholars of Xinjiang Province, China
- 2022D01E20 Natural Science Foundation for Distinguished Young Scholars of Xinjiang Province, China
- no. U1903204, 31760405 the National Natural Science Foundation of China
- no. U1903204, 31760405 the National Natural Science Foundation of China
- no. U1903204, 31760405 the National Natural Science Foundation of China
- no. U1903204, 31760405 the National Natural Science Foundation of China
- no. U1903204, 31760405 the National Natural Science Foundation of China
- JZRC2019B02 Doctoral Program of Cash Crops Research Institute of Xinjiang Academy of Agricultural Science
- JZRC2019B02 Doctoral Program of Cash Crops Research Institute of Xinjiang Academy of Agricultural Science
- JZRC2019B02 Doctoral Program of Cash Crops Research Institute of Xinjiang Academy of Agricultural Science
- JZRC2019B02 Doctoral Program of Cash Crops Research Institute of Xinjiang Academy of Agricultural Science
- xjnkywdzc-2022001-2 Xinjiang Key Laboratory of Crop Biotechnology
- xjnkywdzc-2022001-2 Xinjiang Key Laboratory of Crop Biotechnology
- xjnkywdzc-2022001-2 Xinjiang Key Laboratory of Crop Biotechnology
- xjnkywdzc-2022001-2 Xinjiang Key Laboratory of Crop Biotechnology
- xjnkywdzc-2022001-2 Xinjiang Key Laboratory of Crop Biotechnology
- National key R&D Program of China
Collapse
Affiliation(s)
- Juyun Zheng
- Cash Crops Research Institute of Xinjiang Academy of Agricultural Science ( XAAS ), 830001, Urumqi, Xinjiang, P.R. China
| | - Zeliang Zhang
- Xinjiang Production and Construction Corps, Fifth Division, Eighty-third Regiment, Economic Development Office, 833400, Jinhe, Xinjiang, P.R. China
| | - Nala Zhang
- Engineering Research Centre of Cotton, Ministry of Education/College of Agriculture, Xinjiang Agricultural University, 311 Nongda East Road, 830052, Urumqi, Xinjiang, P.R. China
| | - Yajun Liang
- Cash Crops Research Institute of Xinjiang Academy of Agricultural Science ( XAAS ), 830001, Urumqi, Xinjiang, P.R. China
| | - Zhaolong Gong
- Cash Crops Research Institute of Xinjiang Academy of Agricultural Science ( XAAS ), 830001, Urumqi, Xinjiang, P.R. China
| | - Junhao Wang
- Engineering Research Centre of Cotton, Ministry of Education/College of Agriculture, Xinjiang Agricultural University, 311 Nongda East Road, 830052, Urumqi, Xinjiang, P.R. China
| | - Allah Ditta
- Cotton Group, Plant Breeding and Genetics Division, Nuclear Institute for Agriculture and Biology (NIAB) Faisalabad, NIAB-C Pakistan Institute of Engineering and Applied Sciences (PIEAS), Faisalabad, Pakistan
| | - Zhiwei Sang
- Engineering Research Centre of Cotton, Ministry of Education/College of Agriculture, Xinjiang Agricultural University, 311 Nongda East Road, 830052, Urumqi, Xinjiang, P.R. China
| | - Junduo Wang
- Cash Crops Research Institute of Xinjiang Academy of Agricultural Science ( XAAS ), 830001, Urumqi, Xinjiang, P.R. China.
| | - Xueyuan Li
- Cash Crops Research Institute of Xinjiang Academy of Agricultural Science ( XAAS ), 830001, Urumqi, Xinjiang, P.R. China.
| |
Collapse
|
2
|
Garcia MX, Foote C, van Es S, Devreotes PN, Alexander S, Alexander H. Differential developmental expression and cell type specificity of Dictyostelium catalases and their response to oxidative stress and UV-light. BIOCHIMICA ET BIOPHYSICA ACTA 2000; 1492:295-310. [PMID: 11004503 DOI: 10.1016/s0167-4781(00)00063-4] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Cells of Dictyostelium discoideum are highly resistant to DNA damaging agents such as UV-light, gamma-radiation and chemicals. The genes encoding nucleotide excision repair (NER) and base excision repair (BER) enzymes are rapidly upregulated in response to UV-irradiation and DNA-damaging chemicals, suggesting that this is at least partially responsible for the resistance of this organism to these agents. Although Dictyostelium is also unusually resistant to high concentrations of H(2)O(2), little is known about the response of this organism to oxidative stress. To determine if transcriptional upregulation is a common mechanism for responding to DNA-damaging agents, we have studied the Dictyostelium catalase and Cu/Zn superoxide dismutase antioxidant enzymes. We show that there are two catalase genes and that each is differentially regulated both temporally and spatially during multicellular development. The catA gene is expressed throughout growth and development and its corresponding enzyme is maintained at a steady level. In contrast, the catB gene encodes a larger protein and is only expressed during the final stages of morphogenesis. Cell type fractionation showed that the CatB enzyme is exclusively localized to the prespore cells and the CatA enzyme is found exclusively in the prestalk cells. Each enzyme has a different subcellular localization. The unique developmental timing and cell type distribution suggest that the role for catB in cell differentiation is to protect the dormant spores from oxidative damage. We found that exposure to H(2)O(2) does not result in the induction of the catalase, superoxide dismutase, NER or BER mRNAs. A mutant with greatly reduced levels of catA mRNA and enzyme has greatly increased sensitivity to H(2)O(2) but normal sensitivity to UV. These results indicate that the natural resistance to oxidative stress is not due to an ability to rapidly raise the level of antioxidant or DNA repair enzymes and that the response to UV-light is independent from the response to reactive oxygen compounds.
Collapse
Affiliation(s)
- M X Garcia
- Division of Biological Sciences, University of Missouri, Columbia 65211-7400, USA
| | | | | | | | | | | |
Collapse
|
3
|
Morrison A, Marschalek R, Dingermann T, Harwood AJ. A novel, negative selectable marker for gene disruption in Dictyostelium. Gene 1997; 202:171-6. [PMID: 9427562 DOI: 10.1016/s0378-1119(97)00488-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The expression of an ochre suppressor mutant of the GluII(UUA) tRNA appears to be lethal to Dictyostelium, and offers a novel 'positive negative' strategy to select for targeted gene disruption by homologous recombination. Inclusion of the suppressor tRNA gene decreases the overall transformation frequency by approximately 20-fold. This increases the proportion of targeted gene disruptions to over 90%.
Collapse
Affiliation(s)
- A Morrison
- The Imperial Cancer Research Fund, Clare Hall Laboratory, South Mimms, Herts, UK
| | | | | | | |
Collapse
|
4
|
McGuire V, Alexander S. PsB multiprotein complex of Dictyostelium discoideum. Demonstration of cellulose binding activity and order of protein subunit assembly. J Biol Chem 1996; 271:14596-603. [PMID: 8662961 DOI: 10.1074/jbc.271.24.14596] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
The differentiated spores of Dictyostelium are surrounded by an extracellular matrix, the spore coat, which protects them from environmental factors allowing them to remain viable for extended periods of time. This presumably is a major evolutionary advantage. This unique extracellular matrix is composed of cellulose and glycoproteins. Previous work has shown that some of these spore coat glycoproteins exist as a preassembled multiprotein complex (the PsB multiprotein complex) which is stored in the prespore vesicles (Watson, N., McGuire, V., and Alexander, S (1994) J. Cell Sci. 107, 2567-2579). Later in development, the complex is synchronously secreted from the prespore vesicles and incorporated into the spore coat. We now have shown that the PsB complex has a specific in vitro cellulose binding activity. The analysis of mutants lacking individual subunits of the PsB complex revealed the relative order of assembly of the subunit proteins and demonstrated that the protein subunits must be assembled for cellulose binding activity. These results provide a biochemical explanation for the localization of this multiprotein complex in the spore coat.
Collapse
Affiliation(s)
- V McGuire
- Division of Biological Sciences, University of Missouri, Columbia, Missouri 65211, USA
| | | |
Collapse
|
5
|
Wilkins MR, Williams KL. The extracellular matrix of the Dictyostelium discoideum slug. EXPERIENTIA 1995; 51:1189-96. [PMID: 8536806 DOI: 10.1007/bf01944736] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
In this review, we detail the current understanding of the extracellular matrix (ECM) of the migratory slug phase of the cellular slime mould, Dictyostelium discoideum. We describe some structural and non-structural molecules which comprise the ECM, and how these molecules reflect both plant and animal ECM systems. We also describe zones of the multicellular slug that are known to make ECM components, including the role of the prestalk cells and the slug epithelium-like layer. Finally, we review the contributions of studies on mutants to our understanding of the ECM of D. discoideum, and relate this to differentiation and development in more complex eukaryotic systems.
Collapse
Affiliation(s)
- M R Wilkins
- School of Biological Sciences, Macquarie University, Sydney, N.S.W., Australia
| | | |
Collapse
|
6
|
Williams J, Morrison A. Prestalk cell-differentiation and movement during the morphogenesis of Dictyostelium discoideum. PROGRESS IN NUCLEIC ACID RESEARCH AND MOLECULAR BIOLOGY 1994; 47:1-27. [PMID: 8016318 DOI: 10.1016/s0079-6603(08)60248-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- J Williams
- Imperial Cancer Research Fund, Clare Hall Laboratories, South Mimms, Herts, United Kingdom
| | | |
Collapse
|
7
|
Affiliation(s)
- W F Loomis
- Department of Biology, University of California, San Diego, La Jolla 92093
| |
Collapse
|
8
|
Traynor D, Kessin RH, Williams JG. Chemotactic sorting to cAMP in the multicellular stages of Dictyostelium development. Proc Natl Acad Sci U S A 1992; 89:8303-7. [PMID: 1325653 PMCID: PMC49906 DOI: 10.1073/pnas.89.17.8303] [Citation(s) in RCA: 71] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Dictyostelium transformants that overproduce the extracellular form of cyclic nucleotide phosphodiesterase and so accumulate a reduced amount of cAMP are blocked in development after aggregation in the form of a tight mound, prior to formation of the apical tip. In such mounds, prespore cell differentiation is repressed, and the apical accumulation of prestalk cells is greatly retarded. When a source of cAMP is placed below the arrested mounds, prestalk cells that would normally migrate in an apical direction instead sort downwards to the substratum. Thus, by acting as the chemoattractant that draws prestalk cells to the apex, cAMP signaling directs the formation of a patterned structure.
Collapse
Affiliation(s)
- D Traynor
- Imperial Cancer Research Fund, Clare Hall Laboratory, Potters Bar, Herts, United Kingdom
| | | | | |
Collapse
|
9
|
Witke W, Schleicher M, Noegel AA. Redundancy in the microfilament system: abnormal development of Dictyostelium cells lacking two F-actin cross-linking proteins. Cell 1992; 68:53-62. [PMID: 1732064 DOI: 10.1016/0092-8674(92)90205-q] [Citation(s) in RCA: 126] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
We generated by gene disruption Dictyostelium cells that lacked both the F-actin cross-linking proteins, alpha-actinin and gelation factor. Several major cell functions, such as growth, chemotaxis, phagocytosis, and pinocytosis, were apparently unaltered. However, in all double mutants, development was greatly impaired. After formation of aggregates, cells were very rarely able to form fruiting bodies. This ability was rescued when mutant and wild-type strains were mixed in a ratio of 70 to 30. The developmental program in the mutant was not arrested, since the expression pattern of early and late genes remained unchanged. Development of the mutant was rendered normal when a functional alpha-actinin gene was introduced and expressed, showing the morphogenetic defect to be due to the absence of the two F-actin cross-linking proteins. These findings suggest the existence of a functional network allowing mutual complementation of certain actin-binding proteins.
Collapse
Affiliation(s)
- W Witke
- Max Planck Institute for Biochemistry, Martinsried, Federal Republic of Germany
| | | | | |
Collapse
|
10
|
Corney AJ, Richards AJ, Phillpots T, Hames BD. Developmental regulation of cell-type-enriched mRNAs in Dictyostelium discoideum. Mol Microbiol 1990; 4:613-23. [PMID: 2161991 DOI: 10.1111/j.1365-2958.1990.tb00630.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
We describe sixteen new families of cDNA clones representing mRNAs that are expressed preferentially in either prespore or prestalk cells during development of Dictyostelium discoideum and two new mRNAs that are expressed in a non-cell-type-specific manner. None of the prespore-enriched mRNAs are detectable in Dictyostelium cells until 13-15 h of development but then they increase dramatically and peak at 18-22 h. Upon dissociation of developing aggregates, all these mRNAs rapidly decay to low levels. In marked contrast to data presented for prespore genes by other workers, cyclic AMP either has no effect on the mRNA levels in dissociated cells or is only weakly effective in restoring normal expression. A prestalk-enriched mRNA examined, 5G mRNA, is similarly expressed late in development but is also expressed in vegetative cells. The level of 5G mRNA is only moderately affected by cell disaggregation.
Collapse
Affiliation(s)
- A J Corney
- Department of Biochemistry, University of Leeds, UK
| | | | | | | |
Collapse
|
11
|
Salvado JC, Labarère J. Protein mapping and genome expression variations in the basidiomycete Agrocybe aegerita. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 1989; 78:505-512. [PMID: 24225677 DOI: 10.1007/bf00290834] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/1989] [Accepted: 06/01/1989] [Indexed: 06/02/2023]
Abstract
A procedure suitable for the extraction and mapping of total proteins from the basidiomycete, Agrocybe aegerita, was developed. A. aegerita mycelia were fragmented either with a Dangoumeau grinder, an X-press bomb or a sonicator and the efficiency of these three disruption methods were compared. The extraction buffer composition was optimized to avoid proteolytic activities. 2D-SDS-PAGE analysis of protein extracts showed that the rate of reproducibility depending on extractions and electrophoretic separations was always greater than 96% for all strains. The differences in efficiency observed between the breaking procedures indicate that the A. aegerita cell wall is more mechanically resistant than that of other basidiomycetes. The efficient action of protease inhibitors (PMSF and SDS) showed that A. aegerita mycelia contains numerous and/or highly active proteases. Reproducibility of protein extraction and separation methods allowed the establishment and the comparison of standard maps. Qualitative and quantitative variations in gene products between a wild dikaryotic strain and 11 homokaryotic strains from its progeny were examined. The genetic diversity, determined by comparing the distribution of proteic variations in 11 homokaryons from the same progeny, was comparable to that observed between co-isogenic homokaryons of another basidiomycete.
Collapse
Affiliation(s)
- J C Salvado
- Laboratoire de Génétique Moléculaire et d'Amélioration des Champignons Cultivés, Université de Bordeaux II - INRA, CRA de Bordeaux, Domaine de la Grande Ferrade, F-33140, Pont-de-la-Maye, France
| | | |
Collapse
|
12
|
Abstract
Cyclic AMP and DIF-1 (1-(3,5-dichloro-2,6-dihydroxy-4-methoxyphenyl)-1-hexanone) together induce stalk cell differentiation in vitro in Dictyostelium discoideum strain V12M2. The induction can proceed in two stages: in the first, cyclic AMP brings cells to a DIF-responsive state; in the second, DIF-1 alone can induce stalk cell formation. We report here that during the DIF-1-dependent stage, cyclic AMP is a potent inhibitor of stalk cell differentiation. Addition of cyclic AMP at this stage to V12M2 cells appreciably delays, but does not prevent, stalk cell formation. In contrast, stalk cell differentiation in the more common strain NC4 is completely suppressed by the continued presence of cyclic AMP. This fact explains earlier failures to induce stalk cells in vitro in NC4. We now consistently obtain efficient stalk cell induction in NC4 by removing cyclic AMP in the DIF-1-dependent stage. Cyclic AMP also inhibits the production of a stalk-specific protein (ST310) in both NC4 and a V12M2 derivative. Adenosine, a known antagonist of cyclic AMP action, does not relieve this inhibition by cyclic AMP and does not itself promote stalk cell formation. Finally, stalk cell differentiation of NC4 cells at low density appears to require factors in addition to cyclic AMP and DIF-1, but their nature is not yet known. The inhibition of stalk cell differentiation by cyclic AMP may be important in establishing the prestalk/prespore pattern during normal development, and in preventing the maturation of prestalk into stalk cells until culmination.
Collapse
Affiliation(s)
- M Berks
- MRC Laboratory of Molecular Biology, Cambridge, England
| | | |
Collapse
|
13
|
Early A, McRobbie SJ, Duffy KT, Jermyn KA, Tilly R, Ceccarelli A, Williams JG. Structural and functional characterization of genes encoding Dictyostelium prestalk and prespore cell-specific proteins. DEVELOPMENTAL GENETICS 1988; 9:383-402. [PMID: 3243026 DOI: 10.1002/dvg.1020090419] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The nucleotide sequence of D19, a Dictyostelium gene that encodes a prespore-specific mRNA sequence shows it to encode PsA, the cell surface protein detected by the MUD 1 monoclonal antibody. The predicted sequence of the protein reveals a largely hydrophobic C terminus, with chemical similarity to proteins known to be attached to the plasma membrane via a phosphatidylinositol link. The C-terminal region has direct sequence homology to the contact sites A protein and to the phosphatidylinositol-linked form of a chicken N-CAM, suggesting that it might play a role in cell adhesion. Expression of the D19 gene is known to be induced by cAMP and repressed by adenosine. The accumulation of the D19 mRNA is also repressed by DIF, the putative stalk-specific morphogen, and this effect is mediated at the transcriptional level. The pDd56 and pDd63 genes are induced by DIF, and they are specific markers of prestalk and stalk cells. They encode, respectively, ST310 and ST430, two proteins that were first identified by two-dimensional gel electrophoresis. Both proteins are predominantly composed of a highly conserved, 24-amino acid repeat. The two proteins are localized in the slime sheath of the migratory slug and in the stalk tube and stalk cell wall of the mature culminant, where they presumably function as structural components of the extracellular matrix. We have constructed marked derivatives of the pDd56, pDd63, and D19 genes, and these are correctly regulated after transformation into Dictyostelium cells. Thus we have determined the structure, and elucidated possible functions, for one prespore and two prestalk genes. These sequences should be of value, both as markers of the earliest events in cellular differentiation and in identifying the regulatory sequences controlling cell type-specific gene expression.
Collapse
Affiliation(s)
- A Early
- Imperial Cancer Research Fund, Clare Hall Laboratories, Potters Bar, Hertsfordshire, England
| | | | | | | | | | | | | |
Collapse
|
14
|
McRobbie SJ, Tilly R, Blight K, Ceccarelli A, Williams JG. Identification and localization of proteins encoded by two DIF-inducible genes of Dictyostelium. Dev Biol 1988; 125:59-63. [PMID: 3275426 DOI: 10.1016/0012-1606(88)90058-9] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
We show that pDd56 and pDd63, two related DIF-inducible genes of Dictyostelium, respectively encode the ST310 and ST430 polypeptides identified by Morrissey, Devine, and Loomis (1984, Dev. Biol. 103, 414-424). We localize the two proteins by immunoelectron microscopy to the extracellular matrix surrounding the stalk cells and the stalk tube. Coupled with their predicted amino acid sequence and biochemical properties, this suggests that they are structural proteins of the stalk.
Collapse
Affiliation(s)
- S J McRobbie
- Imperial Cancer Research Fund, Clare Hall Laboratories, Hertfordshire, United Kingdom
| | | | | | | | | |
Collapse
|
15
|
|
16
|
Barclay SL, Smith AM. Identification and analysis of the regulation of a prestalk cell-surface antigen of Dictyostelium discoideum. Differentiation 1987. [DOI: 10.1111/j.1432-0436.1987.tb01546.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
17
|
Barclay SL, Smith AM. Identification and analysis of the regulation of a prestalk cell-surface antigen of Dictyostelium discoideum. Differentiation 1986; 33:101-10. [PMID: 3552829 DOI: 10.1111/j.1432-0436.1986.tb00415.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The properties of two differentiation antigens, rsa 4.2 and rsa 3.1, were examined. Both appear on the cell surface early in differentiation, but they differ with respect to their cell-type specificity. rsa 4.2 appears 1-2 h after differentiation has begun and is present on all cells during all stages of differentiation. In contrast, rsa 3.1 appears after 1-2 h on all aggregating amebae and later becomes restricted to prestalk cells. The pattern of regulation of rsa 3.1 indicates that this prestalk antigen appears on all cells early in differentiation but disappears in cells that differentiate along the prespore pathway. As a result, only cells in the anterior of migrating slugs carry this antigen. Predictions of two competing models of Dictyostelium pattern formation, i.e., position-dependent differentiation and random, position-independent differentiation, were tested by flow cytometry and immunochemical staining of sections of cells at the mound and mound-with-tip stages. Our results do not rule out either model, although they are incompatible with the simplest interpretation of the model for position-independent differentiation. The results clearly indicate that cells that ultimately differentiate along the spore pathway pass through an earlier cell state that includes the presence of a prestalk cell-surface antigen identified as rsa 3.1.
Collapse
|
18
|
|