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Gelasakis AI, Boukouvala E, Babetsa M, Katharopoulos E, Palaska V, Papakostaki D, Giadinis ND, Loukovitis D, Langeveld JPM, Ekateriniadou LV. Polymorphisms of Codons 110, 146, 211 and 222 at the Goat PRNP Locus and Their Association with Scrapie in Greece. Animals (Basel) 2021; 11:ani11082340. [PMID: 34438796 PMCID: PMC8388637 DOI: 10.3390/ani11082340] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Revised: 08/03/2021] [Accepted: 08/05/2021] [Indexed: 12/27/2022] Open
Abstract
Scrapie is considered an endemic disease in both sheep and goats in Greece. However, contrary to sheep, in goats more than one prion protein (PrP) polymorphism has been recognized as a candidate for resistance breeding against the disease. For an impression, candidates which are circulating, (i) brain samples (n = 525) from scrapie-affected (n = 282) and non-affected (n = 243) animals within the national surveillance program, and (ii) individual blood samples (n = 1708) from affected (n = 241) and non-affected (n = 1467) herds, in a large part of mainland Greece and its islands, were collected and assayed. A dedicated Taqman method was used to test for amino acid polymorphisms 110T/P, 146N/S/D, 211R/Q, and 222Q/K. Highly prevalent genotypes were 110TT, 146NN, 211RR, and 222QQ. The frequencies of polymorphisms in blood and negative brain samples for codons 110P, 211Q, and 222K were 4.0%, 3.0%, and 1.9%, respectively, while 146D (0.7%) was present only on Karpathos island. Codon 110P was exclusively found in scrapie-negative brains, and homozygous 110P/P in two scrapie-negative goats. It is concluded that breeding programs in Karpathos could focus on codon 146D, while in other regions carriers of the 110P and 222K allele should be sought. Case-control and challenge studies are now necessary to elucidate the most efficient breeding strategies.
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Affiliation(s)
- Athanasios I. Gelasakis
- Department of Animal Science, School of Animal Biosciences, Agricultural University of Athens, 11855 Athens, Greece;
| | - Evridiki Boukouvala
- Veterinary Research Institute, ELGO-DIMITRA, 54124 Thessaloniki, Greece; (E.B.); (M.B.); (E.K.)
| | - Maria Babetsa
- Veterinary Research Institute, ELGO-DIMITRA, 54124 Thessaloniki, Greece; (E.B.); (M.B.); (E.K.)
| | | | - Vayia Palaska
- National Reference Laboratory for TSEs, Ministry of Agricultural Development and Food, 41110 Larissa, Greece;
| | - Dimitra Papakostaki
- Veterinary Center of Thessaloniki, Ministry of Agricultural Development and Food, 54627 Thessaloniki, Greece;
| | - Nektarios D. Giadinis
- School of Veterinary Medicine, Aristotle University of Thessaloniki, 54627 Thessaloniki, Greece;
| | | | - Jan P. M. Langeveld
- Department of Infection Biology, Wageningen Bioveterinary Research (WBVR), 8221 RA Lelystad, The Netherlands;
| | - Loukia V. Ekateriniadou
- Veterinary Research Institute, ELGO-DIMITRA, 54124 Thessaloniki, Greece; (E.B.); (M.B.); (E.K.)
- Correspondence:
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Katharopoulos E, Di Iorgi N, Fernandez-Alvarez P, Pandey AV, Groessl M, Dubey S, Camats N, Napoli F, Patti G, Lezzi M, Maghnie M, Flück CE. Characterization of Two Novel Variants of the Steroidogenic Acute Regulatory Protein Identified in a Girl with Classic Lipoid Congenital Adrenal Hyperplasia. Int J Mol Sci 2020; 21:ijms21176185. [PMID: 32867102 PMCID: PMC7504070 DOI: 10.3390/ijms21176185] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 08/20/2020] [Accepted: 08/21/2020] [Indexed: 11/23/2022] Open
Abstract
Congenital adrenal hyperplasia (CAH) consists of several autosomal recessive disorders that inhibit steroid biosynthesis. We describe a case report diagnosed with adrenal insufficiency due to low adrenal steroids and adrenocorticotropic hormone excess due to lack of cortisol negative feedback signaling to the pituary gland. Genetic work up revealed two missense variants, p.Thr204Arg and p.Leu260Arg in the STAR gene, inherited by both parents (non-consanguineous). The StAR protein supports CYP11A1 enzyme to cleave the side chain of cholesterol and synthesize pregnenolone which is metabolized to all steroid hormones. We used bioinformatics to predict the impact of the variants on StAR activity and then we performed functional tests to characterize the two novel variants. In a cell system we tested the ability of variants to support cholesterol conversion to pregnenolone and measured their mRNA and protein expression. For both variants, we observed loss of StAR function, reduced protein expression and categorized them as pathogenic variants according to guidelines of the American College of Medical Genetics and Genomics and the Association for Molecular Pathology. These results fit the phenotype of the girl during diagnosis. This study characterizes two novel variants and expands the list of missense variants that cause CAH.
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Affiliation(s)
- Efstathios Katharopoulos
- Department of Paediatrics, Division of Endocrinology, Diabetology & Metabolism, Bern University Hospital, 3010 Bern, Switzerland; (E.K.); (A.V.P.); (S.D.)
- Department of Biomedical Research, Bern University Hospital and University of Bern, 3010 Bern, Switzerland;
- Graduate School Bern, University of Bern, 3012 Bern, Switzerland
| | - Natascia Di Iorgi
- Department of Paediatrics, Istituto Giannina Gaslini, University of Genoa, 16147 Genoa, Italy; (N.D.I.); (F.N.); (G.P.); (M.L.); (M.M.)
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genova, 16147 Genoa, Italy
| | - Paula Fernandez-Alvarez
- Department of Clinical and Molecular Genetics and Rare Disease Unit, University Hospital Vall d’Hebron, 08035 Barcelona, Spain;
| | - Amit V. Pandey
- Department of Paediatrics, Division of Endocrinology, Diabetology & Metabolism, Bern University Hospital, 3010 Bern, Switzerland; (E.K.); (A.V.P.); (S.D.)
- Department of Biomedical Research, Bern University Hospital and University of Bern, 3010 Bern, Switzerland;
| | - Michael Groessl
- Department of Biomedical Research, Bern University Hospital and University of Bern, 3010 Bern, Switzerland;
- Department of Nephrology and Hypertension, Bern University Hospital, 3010 Bern, Switzerland
| | - Shraddha Dubey
- Department of Paediatrics, Division of Endocrinology, Diabetology & Metabolism, Bern University Hospital, 3010 Bern, Switzerland; (E.K.); (A.V.P.); (S.D.)
- Department of Biomedical Research, Bern University Hospital and University of Bern, 3010 Bern, Switzerland;
| | - Núria Camats
- Growth and Development Research Unit, Vall d’Hebron Research Institute (VHIR), Centre of Biomedical Research on Rare Diseases (CIBERER), Instituto de Salud Carlos III, 08035 Barcelona, Spain;
| | - Flavia Napoli
- Department of Paediatrics, Istituto Giannina Gaslini, University of Genoa, 16147 Genoa, Italy; (N.D.I.); (F.N.); (G.P.); (M.L.); (M.M.)
| | - Giuseppa Patti
- Department of Paediatrics, Istituto Giannina Gaslini, University of Genoa, 16147 Genoa, Italy; (N.D.I.); (F.N.); (G.P.); (M.L.); (M.M.)
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genova, 16147 Genoa, Italy
| | - Marilea Lezzi
- Department of Paediatrics, Istituto Giannina Gaslini, University of Genoa, 16147 Genoa, Italy; (N.D.I.); (F.N.); (G.P.); (M.L.); (M.M.)
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genova, 16147 Genoa, Italy
| | - Mohamad Maghnie
- Department of Paediatrics, Istituto Giannina Gaslini, University of Genoa, 16147 Genoa, Italy; (N.D.I.); (F.N.); (G.P.); (M.L.); (M.M.)
| | - Christa E. Flück
- Department of Paediatrics, Division of Endocrinology, Diabetology & Metabolism, Bern University Hospital, 3010 Bern, Switzerland; (E.K.); (A.V.P.); (S.D.)
- Department of Biomedical Research, Bern University Hospital and University of Bern, 3010 Bern, Switzerland;
- Correspondence:
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Praveen VP, Ladjouze A, Sauter KS, Pulickal A, Katharopoulos E, Trippel M, Perren A, Pandey AV, Flück CE. Novel CYP19A1 Mutations Extend the Genotype-Phenotype Correlation and Reveal the Impact on Ovarian Function. J Endocr Soc 2020; 4:bvaa030. [PMID: 32318648 PMCID: PMC7159065 DOI: 10.1210/jendso/bvaa030] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Accepted: 03/04/2020] [Indexed: 02/06/2023] Open
Abstract
Context The steroidogenic enzyme aromatase (CYP19A1) is required for estrogen biosynthesis from androgen precursors in the ovary and extragonadal tissues. The role of aromatase, and thus estrogens, is best illustrated by genetic variations of the CYP19A1 gene leading to aromatase deficiency or excess. Objective The objective of this work is to characterize novel CYP19A1 variants. Design setting and patients Variants causing aromatase deficiency were suspected in four 46,XX children of African and Indian origin by careful clinical phenotyping. Sequencing of the CYP19A1 gene identified novel variants. Minigene experiments, aromatase activity assay, and computational, and histological analysis were used to characterize the variants. Main outcome measure and results CYP19A1 variants were found in all patients: a deletion in intron 9 leading to p.P423_H503del, a delins variant at p.P154, and point variants p.V161D, p.R264C, p.R375C. Except for R264C, all variants showed a loss of function. Protein structure and dynamics studies were in line with functional assays. The 2 female patients with delins variants manifested with ambiguous genitalia at birth. Histologic investigation revealed normal ovarian tissue on one side and a streak gonad on the other. Two female patients presented with abnormal pubertal development and polycystic ovaries. Conclusion In girls, aromatase deficiency usually manifests at birth, but diagnosis may also be made because of abnormal pubertal development or ovarian torsion due to (poly)cystic ovaries. The ovary harboring CYP19A1 variants may present as streak gonad or appears normal at birth, but is then at very high risk to produce cysts with aging and is therefore prone to ovarian torsion.
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Affiliation(s)
| | | | - Kay-Sara Sauter
- Department of Pediatrics, Division of Pediatric Endocrinology, Diabetology and Metabolism University Children's Hospital Bern, Switzerland, and Department of Biomedical Research, University of Bern, Bern, Switzerland
| | - Annie Pulickal
- Department of Endocrinology, Amrita Institute of Medical Sciences, Kochi, Kerala, India
| | - Efstathios Katharopoulos
- Department of Pediatrics, Division of Pediatric Endocrinology, Diabetology and Metabolism University Children's Hospital Bern, Switzerland, and Department of Biomedical Research, University of Bern, Bern, Switzerland
| | - Mafalda Trippel
- Institute of Pathology, University of Bern, Bern, Switzerland
| | - Aurel Perren
- Institute of Pathology, University of Bern, Bern, Switzerland
| | - Amit V Pandey
- Department of Pediatrics, Division of Pediatric Endocrinology, Diabetology and Metabolism University Children's Hospital Bern, Switzerland, and Department of Biomedical Research, University of Bern, Bern, Switzerland
| | - Christa E Flück
- Department of Pediatrics, Division of Pediatric Endocrinology, Diabetology and Metabolism University Children's Hospital Bern, Switzerland, and Department of Biomedical Research, University of Bern, Bern, Switzerland
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Nanis I, Hatzikamari M, Katharopoulos E, Boukouvala E, Ekateriniadou L, Litopoulou-Tzanetaki E, Gerasopoulos D. Microbiological and physicochemical changes during fermentation of solid residue of olive mill wastewaters: Exploitation towards the production of an olive paste – type product. Lebensm Wiss Technol 2020. [DOI: 10.1016/j.lwt.2019.108671] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Katharopoulos E, Sauter K, Pandey AV, Flück CE. In silico and functional studies reveal novel loss-of-function variants of SRD5A2, but no variants explaining excess 5α-reductase activity. J Steroid Biochem Mol Biol 2019; 190:263-272. [PMID: 30703436 DOI: 10.1016/j.jsbmb.2019.01.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 01/17/2019] [Accepted: 01/26/2019] [Indexed: 12/16/2022]
Abstract
Androgens are steroid hormones essential for human male and female development. Steroid reductases 5α (SRD5As) are key enzymes in androgen biosynthesis. Mutations in the human SRD5A2 are known to cause loss-of-function and severe 46,XY undervirilization. Gain-of-function variants have been suggested in androgen excess syndromes, but have not been found so far. Therefore we searched for gain-of-function mutations in the human SRD5A2 gene which might explain hyperandrogenic disorders such as the polycystic ovary syndrome, premature adrenarche and prostate cancer. We screened databases for candidate variants and characterised them in silico with the help of a novel SRD5A2 model. We selected 9 coding SNPs (A49T, R50A, P106L, P106A, N122A, L167S, R168C, P173S, R227Q) that have not been described in manifesting individuals, and assessed their enzyme kinetic properties in HEK293 cells. SRD5A2 activity was assessed by conversion of testosterone (T), progesterone (Prog) and androstenedione (Δ4A) to their 5α-reduced metabolites. Variants R50A and P173S showed partial activity with substrates T (34% and 28%) and Δ4A (37% and 22%). With substrate Prog variants P106L, P106A, L167S and R168C in addition showed partial activity (15% to 64%). Functional testing of all other variants showed loss-of-function. As predicted in our in silico analysis, all coding SNPs affected enzyme activity, however none of them showed gain-of-function. Thus excess 5α-reductase activity might be rather regulated at the (post)-transcriptional and/or post-translational level. However through this work seven new coding SNPs were characterised which might be of clinical relevance. It is possible that individuals carrying these SNPs show a minor phenotype that is not yet identified.
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Affiliation(s)
- Efstathios Katharopoulos
- Pediatric Endocrinology, Diabetology and Metabolism, Department of Pediatrics, University Hospital Inselspital, University of Bern, 3010 Bern, Switzerland; Department of BioMedical Research, University Hospital Inselspital, University of Bern, 3010 Bern, Switzerland; Graduate School of Bern, University of Bern, 3000 Bern, Switzerland
| | - Kay Sauter
- Pediatric Endocrinology, Diabetology and Metabolism, Department of Pediatrics, University Hospital Inselspital, University of Bern, 3010 Bern, Switzerland; Department of BioMedical Research, University Hospital Inselspital, University of Bern, 3010 Bern, Switzerland
| | - Amit V Pandey
- Pediatric Endocrinology, Diabetology and Metabolism, Department of Pediatrics, University Hospital Inselspital, University of Bern, 3010 Bern, Switzerland; Department of BioMedical Research, University Hospital Inselspital, University of Bern, 3010 Bern, Switzerland
| | - Christa E Flück
- Pediatric Endocrinology, Diabetology and Metabolism, Department of Pediatrics, University Hospital Inselspital, University of Bern, 3010 Bern, Switzerland; Department of BioMedical Research, University Hospital Inselspital, University of Bern, 3010 Bern, Switzerland.
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Katharopoulos E, Sauter K, Pandey A, Flueck C. MON-219 In Silico and in Vitro Studies of Human 5α-Reductase Type II Variants in Search for Activating Variants Explaining Androgen Excess Reveal New Loss-Of-Function Variants. J Endocr Soc 2019. [PMCID: PMC6550614 DOI: 10.1210/js.2019-mon-219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Background: Androgens are steroid hormones necessary for human sex development. Testosterone (T) and the more potent dihydrotestosterone (DHT) are maybe the best known androgens, which exert their effect by binding and activating the androgen receptor. Steroid reductases 5α (SRD5As) catalyse the conversion of T to DHT in the classic androgen production pathway, or from 17-hydroxyprogesterone to 17OH-dihydroprogesterone, and androstenedione to androstanedione in alternate pathways leading to DHT. There are two enzymes with differential expression, of which SRD5A2 is expressed in reproductive organs and liver, and catalyses the reaction of T to DHT more efficiently than SRD5A1. Human SRD5A2 loss-of-function mutations are known, and cause severe 46XY undervirilization, while gain-of-function variants have been suggested in androgen excess syndromes such as premature adrenarche, the polycystic ovary syndrome or prostate tumors, but they have not been found so far. Aim: Therefore, we aimed to search for gain-of-function mutations in the human SRD5A2 gene. Methods: For that, we searched databases for candidate variants and performed bioinformatic and functional tests on selected variants. After conservation analysis of SRD5A2, a novel 3D protein model was constructed to locate the exact position of amino acids in the tertiary structure and predict their effect on protein function and substrate interaction. We then collected 116 coding SNPs in SRD5A2 from OMIM, dbSNP, Pubmed, Clinvar, HGMD and Uniprot databases. These SNPs were ranked according to their association with phenotypes, physical location in our 3D model, and molecular dynamics simulation studies. Finally, we selected 9 coding SNPs for in vitro studies. These SNPs were located within or close to highly conserved areas that form the binding cavities for substrates or cofactor NADPH. SRD5A2 variants were expressed in HEK293 cells and activity was assessed by conversion of testosterone (T), progesterone (Prog) and androstenedione (Δ4Α) to their 5α-reduced metabolites. Result: Variants R50A and P173S showed partial activity with substrates T (34% and 28%) and Δ4Α (37% and 22%). With substrate Prog variants P106L, P106A, L167S and R168C in addition showed partial activity (15% to 64%). Functional testing of all other variants showed loss-of-function. As predicted in our in silico analysis, all coding SNPs affected enzyme activity, however none of them showed gain-of-function In conclusion, we provide a novel protein model for studies of SRD5A2. No gain-of-function variants were identified, but we have characterized 7 human SRD5A2 variants, which might be of clinical relevance for their enzyme activity loss. It is possible that individuals carrying these SNPs show a minor phenotype that is not yet identified.
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Affiliation(s)
| | - Kay Sauter
- Department of Biomedical Research, Bern, , Switzerland
| | - Amit Pandey
- Frontiers in Genetics - Frontiers Publishers, Bern, , Switzerland
| | - Christa Flueck
- Dept of Ped Endo and Diab, Univ Children's Hosp Inselspital, Berne, , Switzerland
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Katharopoulos E, Sauter K, Pandey AV, Flück CE. In silico
and
in vitro
Studies of Human 5α‐reductase Type II Reveal New Loss of Function Variants. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.781.19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Efstathios Katharopoulos
- Pediatric EndocrinologyUniversity Children's Hospital BernBernSwitzerland
- Biomedical ResearchUniversity of BernBernSwitzerland
| | - Kay‐Sara Sauter
- Pediatric EndocrinologyUniversity Children's Hospital BernBernSwitzerland
- Biomedical ResearchUniversity of BernBernSwitzerland
| | - Amit V Pandey
- Pediatric EndocrinologyUniversity Children's Hospital BernBernSwitzerland
- Biomedical ResearchUniversity of BernBernSwitzerland
| | - Christa E Flück
- Pediatric EndocrinologyUniversity Children's Hospital BernBernSwitzerland
- Biomedical ResearchUniversity of BernBernSwitzerland
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Katharopoulos E, Touloupi K, Touraki M. Monitoring of multiple bacteriocins through a developed dual extraction protocol and comparison of HPLC-DAD with turbidometry as their quantification system. J Microbiol Methods 2016; 127:123-131. [PMID: 27282100 DOI: 10.1016/j.mimet.2016.06.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Revised: 06/03/2016] [Accepted: 06/03/2016] [Indexed: 11/19/2022]
Abstract
The present study describes the development of a simple and efficient screening system that allows identification and quantification of nine bacteriocins produced by Lactococcus lactis. Cell-free L. lactis extracts presented a broad spectrum of antibacterial activity, including Gram-negative bacteria, Gram-positive bacteria, and fungi. The characterization of their sensitivity to pH, and heat, showed that the extracts retained their antibacterial activity at extreme pH values and in a wide temperature range. The loss of antibacterial activity following treatment of the extracts with lipase or protease suggests a lipoproteinaceous nature of the produced antimicrobials. The extracts were subjected to a purification protocol that employs a two phase extraction using ammonium sulfate precipitation and organic solvent precipitation, followed by ion exchange chromatography, solid phase extraction and HPLC. In the nine fractions that presented antimicrobial activity, bacteriocins were quantified by the turbidometric method using a standard curve of nisin and by the HPLC method with nisin as the external standard, with both methods producing comparable results. Turbidometry appears to be unique in the qualitative determination of bacteriocins but the only method suitable to both separate and quantify the bacteriocins providing increased sensitivity, accuracy, and precision is HPLC.
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Affiliation(s)
- Efstathios Katharopoulos
- Laboratory of General Biology, Division of Genetics, Development and Molecular Biology, Department of Biology, School of Sciences, Aristotle University of Thessaloniki (A.U.TH.), 54 124 Thessaloniki, Greece
| | - Katerina Touloupi
- Laboratory of General Biology, Division of Genetics, Development and Molecular Biology, Department of Biology, School of Sciences, Aristotle University of Thessaloniki (A.U.TH.), 54 124 Thessaloniki, Greece
| | - Maria Touraki
- Laboratory of General Biology, Division of Genetics, Development and Molecular Biology, Department of Biology, School of Sciences, Aristotle University of Thessaloniki (A.U.TH.), 54 124 Thessaloniki, Greece.
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