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  1. Article ; Online: Genetic diagnosis of endocrine disorders in Cyprus through the Cyprus Institute of Neurology and Genetics: an ENDO-ERN Reference Center.

    Neocleous, Vassos / Fanis, Pavlos / Toumba, Meropi / Skordis, Nicos / Phylactou, Leonidas A

    Orphanet journal of rare diseases

    2024  Volume 19, Issue 1, Page(s) 167

    Abstract: The report covers the current and past activities of the department Molecular Genetics-Function and Therapy (MGFT) at the Cyprus Institute of Neurology and Genetics (CING), an affiliated Reference Center for the European Reference Network on Rare ... ...

    Abstract The report covers the current and past activities of the department Molecular Genetics-Function and Therapy (MGFT) at the Cyprus Institute of Neurology and Genetics (CING), an affiliated Reference Center for the European Reference Network on Rare Endocrine Conditions (Endo-ERN).The presented data is the outcome of > 15 years long standing collaboration between MGFT and endocrine specialists from the local government hospitals and the private sector. Up-to-date > 2000 genetic tests have been performed for the diagnosis of inherited rare endocrine disorders. The major clinical entities included Congenital Adrenal Hyperplasia (CAH) due to pathogenic variants in CYP21A2 gene and Multiple Endocrine Neoplasia (MEN) type 2 due to pathogenic variants in the RET proto-oncogene. Other rare and novel pathogenic variants in ANOS1, WDR11, FGFR1, RNF216, and CHD7 genes were also found in patients with Congenital Hypogonadotropic Hypogonadism. Interestingly, a few patients with Disorders of Sexual Differentiation (DSD) shared rare pathogenic variants in the SRD5A2, HSD17B3 and HSD3B2 while patients with Glucose and Insulin Homeostasis carried theirs in GCK and HNF1A genes. Lastly, MGFT over the last few years has established an esteemed diagnostic and research program on premature puberty with emphasis on the implication of MKRN3 gene on the onset of the disease and the identification of other prognosis biomarkers.As an Endo-ERN member MGFT department belongs to this large European network and holds the same humanistic ideals which aim toward the improvements of health care for patients with rare endocrine conditions in respect to improved and faster diagnosis.
    MeSH term(s) Humans ; Cyprus ; Multiple Endocrine Neoplasia Type 2a/diagnosis ; Multiple Endocrine Neoplasia Type 2a/genetics ; Endocrine System Diseases/diagnosis ; Endocrine System Diseases/genetics ; Adrenal Hyperplasia, Congenital/diagnosis ; Adrenal Hyperplasia, Congenital/genetics ; Genetic Testing ; Ubiquitin-Protein Ligases ; Steroid 21-Hydroxylase/genetics ; Membrane Proteins/genetics ; 3-Oxo-5-alpha-Steroid 4-Dehydrogenase
    Chemical Substances RNF216 protein, human (EC 2.3.2.27) ; Ubiquitin-Protein Ligases (EC 2.3.2.27) ; MKRN3 protein, human (EC 2.3.2.27) ; CYP21A2 protein, human (EC 1.14.14.16) ; Steroid 21-Hydroxylase (EC 1.14.14.16) ; SRD5A2 protein, human (EC 1.3.99.5) ; Membrane Proteins ; 3-Oxo-5-alpha-Steroid 4-Dehydrogenase (EC 1.3.99.5)
    Language English
    Publishing date 2024-04-18
    Publishing country England
    Document type Journal Article
    ZDB-ID 2225857-7
    ISSN 1750-1172 ; 1750-1172
    ISSN (online) 1750-1172
    ISSN 1750-1172
    DOI 10.1186/s13023-024-03171-4
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Circulating Biomarkers in Muscular Dystrophies: Disease and Therapy Monitoring.

    Koutsoulidou, Andrie / Phylactou, Leonidas A

    Molecular therapy. Methods & clinical development

    2020  Volume 18, Page(s) 230–239

    Abstract: Muscular dystrophies are a group of inherited disorders that primarily affect the muscle tissues. Across the muscular dystrophies, symptoms commonly compromise the quality of life in all areas of functioning. It is well noted that muscular dystrophies ... ...

    Abstract Muscular dystrophies are a group of inherited disorders that primarily affect the muscle tissues. Across the muscular dystrophies, symptoms commonly compromise the quality of life in all areas of functioning. It is well noted that muscular dystrophies need reliable and measurable biomarkers that will monitor the progress of the disease and evaluate the potential therapeutic approaches. In this review, we analyze the current findings regarding the development of blood-based circulating biomarkers for different types of muscular dystrophies. We emphasize those muscular dystrophies that gained particular interest for the development of biomarkers, including Duchenne muscular dystrophy, Becker muscular dystrophy, myotonic dystrophy types 1 and 2, Ullrich congenital muscular dystrophy, congenital muscular dystrophy type 1A, Facioscapulohumeral muscular dystrophy, and limb-girdle muscular dystrophy types 2A, 2B, 2C, and 2D, recently renamed as limb-girdle muscular dystrophy R1 calpain3-related, R2 dysferlin-related, R5 γ-sarcoglycan-related, and R3 α-sarcoglycan-related. This review highlights the up-to-date progress in the development of biomarkers at the level of proteins, lipids, and metabolites, as well as microRNAs (miRNAs) that currently are the main potential biomarker candidates in muscular dystrophies.
    Language English
    Publishing date 2020-05-22
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 2872938-9
    ISSN 2329-0501 ; 2329-0501
    ISSN (online) 2329-0501
    ISSN 2329-0501
    DOI 10.1016/j.omtm.2020.05.017
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Special Issue--Towards Understanding the Mechanisms and Curing of Muscular Dystrophy Diseases.

    Phylactou, Leonidas A

    Molecules (Basel, Switzerland)

    2015  Volume 20, Issue 7, Page(s) 12944–12945

    Abstract: Muscular dystrophies are a heterogeneous group of inherited diseases with different molecular basss, but sharing similar clinical features and dystrophic changes. ...

    Abstract Muscular dystrophies are a heterogeneous group of inherited diseases with different molecular basss, but sharing similar clinical features and dystrophic changes.
    MeSH term(s) Humans ; Muscle, Skeletal/pathology ; Muscular Dystrophies/genetics ; Muscular Dystrophies/pathology ; Muscular Dystrophies/therapy
    Language English
    Publishing date 2015-07-16
    Publishing country Switzerland
    Document type Editorial
    ZDB-ID 1413402-0
    ISSN 1420-3049 ; 1431-5165 ; 1420-3049
    ISSN (online) 1420-3049
    ISSN 1431-5165 ; 1420-3049
    DOI 10.3390/molecules200712944
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Salt-wasting congenital adrenal hyperplasia phenotype as a result of the TNXA/TNXB chimera 1 (CAH-X CH-1) and the pathogenic IVS2-13A/C > G in CYP21A2 gene.

    Fanis, Pavlos / Skordis, Nicos / Phylactou, Leonidas A / Neocleous, Vassos

    Hormones (Athens, Greece)

    2022  Volume 22, Issue 1, Page(s) 71–77

    Abstract: Background: Genetic diversity of mutations in the CYP21A2 gene is the main cause of the monogenic congenital adrenal hyperplasia (CAH) disorder. On chromosome 6p21.3, the CYP21A2 gene is partially overlapped by the TNXB gene, the two residing in tandem ... ...

    Abstract Background: Genetic diversity of mutations in the CYP21A2 gene is the main cause of the monogenic congenital adrenal hyperplasia (CAH) disorder. On chromosome 6p21.3, the CYP21A2 gene is partially overlapped by the TNXB gene, the two residing in tandem with their highly homologous corresponding pseudogenes (CYP21A1P and TNXA), which leads to recurrent homologous recombination.
    Methods and results: In the present study, the genetic status of an ethnic Greek-Cypriot family, with a female neonate that was originally classified as male and manifested the salt-wasting (SW) form, is presented. Genetic defects in the CYP21A2 and TNXB genes were investigated by Sanger sequencing multiplex ligation-dependent probe amplification (MLPA) and a real-time PCR assay. The neonate carried in compound heterozygosity the TNXA/TNXB chimeric gene complex (termed CAH-X CH-1) that results in a contiguous CYP21A2 and TNXB deletion and in her second allele the pathogenic IVS2-13A/C > G (c.655A/C > G) in CYP21A2.
    Conclusions: The classic SW-CAH due to 21-hydroxylase (21-OH) deficiency may result from various complex etiological mechanisms and, as such, can involve the formation of monoallelic TNXA/TNXB chimeras found in trans with other CYP21A2 pathogenic variants. This is a rare case of CAH due to 21-hydroxylase deficiency, which elucidates the role of the complex RCCX CNV structure in the development of the disease. Identification of the correct CAH genotypes for a given phenotype is of considerable value in assisting clinicians in prenatal diagnosis, appropriate treatment, and genetic counseling.
    MeSH term(s) Male ; Female ; Humans ; Adrenal Hyperplasia, Congenital/diagnosis ; Adrenal Hyperplasia, Congenital/genetics ; Steroid 21-Hydroxylase/genetics ; Phenotype ; Mutation ; Tenascin/genetics
    Chemical Substances Steroid 21-Hydroxylase (EC 1.14.14.16) ; TNXA protein, human ; Tenascin ; CYP21A2 protein, human (EC 1.14.14.16)
    Language English
    Publishing date 2022-10-20
    Publishing country Switzerland
    Document type Case Reports ; Journal Article
    ZDB-ID 2075912-5
    ISSN 2520-8721 ; 1109-3099
    ISSN (online) 2520-8721
    ISSN 1109-3099
    DOI 10.1007/s42000-022-00410-w
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Gonadotropin-Releasing Hormone Receptor (GnRHR) and Hypogonadotropic Hypogonadism.

    Fanis, Pavlos / Neocleous, Vassos / Papapetrou, Irene / Phylactou, Leonidas A / Skordis, Nicos

    International journal of molecular sciences

    2023  Volume 24, Issue 21

    Abstract: Human sexual and reproductive development is regulated by the hypothalamic-pituitary-gonadal (HPG) axis, which is primarily controlled by the gonadotropin-releasing hormone (GnRH) acting on its receptor (GnRHR). Dysregulation of the axis leads to ... ...

    Abstract Human sexual and reproductive development is regulated by the hypothalamic-pituitary-gonadal (HPG) axis, which is primarily controlled by the gonadotropin-releasing hormone (GnRH) acting on its receptor (GnRHR). Dysregulation of the axis leads to conditions such as congenital hypogonadotropic hypogonadism (CHH) and delayed puberty. The pathophysiology of GnRHR makes it a potential target for treatments in several reproductive diseases and in congenital adrenal hyperplasia. GnRHR belongs to the G protein-coupled receptor family and its GnRH ligand, when bound, activates several complex and tissue-specific signaling pathways. In the pituitary gonadotrope cells, it triggers the G protein subunit dissociation and initiates a cascade of events that lead to the production and secretion of the luteinizing hormone (LH) and follicle-stimulating hormone (FSH) accompanied with the phospholipase C, inositol phosphate production, and protein kinase C activation. Pharmacologically, GnRHR can be modulated by synthetic analogues. Such analogues include the agonists, antagonists, and the pharmacoperones. The agonists stimulate the gonadotropin release and lead to receptor desensitization with prolonged use while the antagonists directly block the GnRHR and rapidly reduce the sex hormone production. Pharmacoperones include the most recent GnRHR therapeutic approaches that directly correct the misfolded GnRHRs, which are caused by genetic mutations and hold serious promise for CHH treatment. Understanding of the GnRHR's genomic and protein structure is crucial for the most appropriate assessing of the mutation impact. Such mutations in the GNRHR are linked to normosmic hypogonadotropic hypogonadism and lead to various clinical symptoms, including delayed puberty, infertility, and impaired sexual development. These mutations vary regarding their mode of inheritance and can be found in the homozygous, compound heterozygous, or in the digenic state. GnRHR expression extends beyond the pituitary gland, and is found in reproductive tissues such as ovaries, uterus, and prostate and non-reproductive tissues such as heart, muscles, liver and melanoma cells. This comprehensive review explores GnRHR's multifaceted role in human reproduction and its clinical implications for reproductive disorders.
    MeSH term(s) Female ; Male ; Humans ; Receptors, LHRH/genetics ; Receptors, LHRH/metabolism ; Puberty, Delayed ; Hypogonadism/drug therapy ; Hypogonadism/genetics ; Hypogonadism/metabolism ; Gonadotropin-Releasing Hormone/metabolism ; Luteinizing Hormone/metabolism ; Follicle Stimulating Hormone ; Klinefelter Syndrome
    Chemical Substances Receptors, LHRH ; Gonadotropin-Releasing Hormone (33515-09-2) ; Luteinizing Hormone (9002-67-9) ; Follicle Stimulating Hormone (9002-68-0)
    Language English
    Publishing date 2023-11-04
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms242115965
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: RET Proto-Oncogene Variants in Patients with Medullary Thyroid Carcinoma from the Mediterranean Basin: A Brief Report.

    Neocleous, Vassos / Fanis, Pavlos / Frangos, Savvas / Skordis, Nicos / Phylactou, Leonidas A

    Life (Basel, Switzerland)

    2023  Volume 13, Issue 6

    Abstract: Multiple endocrine neoplasia type 2 (MEN2) is an autosomal dominant (AD) condition with very high penetrance and expressivity. It is characterized into three clinical entities recognized as MEN2A, MEN2B, and familial medullary thyroid carcinoma (FMTC). ... ...

    Abstract Multiple endocrine neoplasia type 2 (MEN2) is an autosomal dominant (AD) condition with very high penetrance and expressivity. It is characterized into three clinical entities recognized as MEN2A, MEN2B, and familial medullary thyroid carcinoma (FMTC). In both MEN2A and MEN2B, there is a manifestation of multicentric tumor formation in the major organs such as the thyroid, parathyroid, and adrenal glands where the
    Language English
    Publishing date 2023-06-06
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662250-6
    ISSN 2075-1729
    ISSN 2075-1729
    DOI 10.3390/life13061332
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Methylation status of hypothalamic

    Fanis, Pavlos / Morrou, Maria / Tomazou, Marios / Michailidou, Kyriaki / Spyrou, George M / Toumba, Meropi / Skordis, Nicos / Neocleous, Vassos / Phylactou, Leonidas A

    Frontiers in endocrinology

    2023  Volume 13, Page(s) 1075341

    Abstract: Makorin RING finger protein 3 (MKRN3) is an important factor located on chromosome 15 in the imprinting region associated with Prader-Willi syndrome. ... ...

    Abstract Makorin RING finger protein 3 (MKRN3) is an important factor located on chromosome 15 in the imprinting region associated with Prader-Willi syndrome. Imprinted
    MeSH term(s) Animals ; Female ; Mice ; DNA Methylation ; Epigenesis, Genetic ; Hypothalamus/metabolism ; Sexual Maturation/genetics ; Ubiquitin-Protein Ligases/genetics ; Promoter Regions, Genetic
    Chemical Substances Mkrn3 protein, mouse (EC 2.3.2.27) ; Ubiquitin-Protein Ligases (EC 2.3.2.27)
    Language English
    Publishing date 2023-01-13
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2592084-4
    ISSN 1664-2392
    ISSN 1664-2392
    DOI 10.3389/fendo.2022.1075341
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Selective Delivery to Cardiac Muscle Cells Using Cell-Specific Aptamers.

    Philippou, Styliana / Mastroyiannopoulos, Nikolaos P / Tomazou, Marios / Oulas, Anastasios / Ackers-Johnson, Matthew / Foo, Roger S / Spyrou, George M / Phylactou, Leonidas A

    Pharmaceuticals (Basel, Switzerland)

    2023  Volume 16, Issue 9

    Abstract: In vivo SELEX is an advanced adaptation of Systematic Evolution of Ligands by Exponential Enrichment (SELEX) that allows the development of aptamers capable of recognizing targets directly within their natural microenvironment. While this methodology ... ...

    Abstract In vivo SELEX is an advanced adaptation of Systematic Evolution of Ligands by Exponential Enrichment (SELEX) that allows the development of aptamers capable of recognizing targets directly within their natural microenvironment. While this methodology ensures a higher translation potential for the selected aptamer, it does not select for aptamers that recognize specific cell types within a tissue. Such aptamers could potentially improve the development of drugs for several diseases, including neuromuscular disorders, by targeting solely the proteins involved in their pathogenesis. Here, we describe our attempt to utilize in vivo SELEX with a modification in the methodology that drives the selection of intravenously injected aptamers towards a specific cell type of interest. Our data suggest that the incorporation of a cell enrichment step can direct the in vivo localization of RNA aptamers into cardiomyocytes, the cardiac muscle cells, more readily over other cardiac cells. Given the crucial role of cardiomyocytes in the disease pathology in DMD cardiomyopathy and therapy, these aptamers hold great potential as drug delivery vehicles with cardiomyocyte selectivity.
    Language English
    Publishing date 2023-09-06
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2193542-7
    ISSN 1424-8247
    ISSN 1424-8247
    DOI 10.3390/ph16091264
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: The pathogenic p.Gln319Ter variant is not causing congenital adrenal hyperplasia when inherited in one of the duplicated CYP21A2 genes.

    Fanis, Pavlos / Skordis, Nicos / Toumba, Meropi / Picolos, Michalis / Tanteles, George A / Neocleous, Vassos / Phylactou, Leonidas A

    Frontiers in endocrinology

    2023  Volume 14, Page(s) 1156616

    Abstract: Objective: The study aimed to identify the pathogenic status of p.Gln319Ter (NM_000500.7: c.955C>T) variant when inherited in a single : Methods: 38 females and 8 males with hyperandrogenemia, previously screened by sequencing and identified as ... ...

    Abstract Objective: The study aimed to identify the pathogenic status of p.Gln319Ter (NM_000500.7: c.955C>T) variant when inherited in a single
    Methods: 38 females and 8 males with hyperandrogenemia, previously screened by sequencing and identified as carriers for the pathogenic p.Gln319Ter, were herein tested by multiplex ligation-dependent probe amplification (MLPA) and a real-time PCR Copy number Variation (CNV) assay.
    Results: Both MLPA and real-time PCR CNV analyses confirmed a bimodular and pathogenic RCCX haplotype with a single
    Conclusion: The employed methodologies identified a considerable number of individuals with non-pathogenic p.Gln319Ter from the individuals that typically carry the pathogenic p.Gln319Ter in a single
    MeSH term(s) Male ; Pregnancy ; Female ; Humans ; Adrenal Hyperplasia, Congenital/genetics ; Adrenal Hyperplasia, Congenital/diagnosis ; Steroid 21-Hydroxylase/genetics ; DNA Copy Number Variations ; Haplotypes ; Heterozygote
    Chemical Substances Steroid 21-Hydroxylase (EC 1.14.14.16) ; CYP21A2 protein, human (EC 1.14.14.16)
    Language English
    Publishing date 2023-05-31
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2592084-4
    ISSN 1664-2392
    ISSN 1664-2392
    DOI 10.3389/fendo.2023.1156616
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Audiological features in Serbian patients with hearing impairment identified with c.35delG in the GJB2 gene

    Dobrić Bojana / Radivojević Danijela / Ječmenica Jovana / Neocleous Vassos / Fanis Pavlos / Phylactou Leonidas A. / Đurišić Marina

    Srpski Arhiv za Celokupno Lekarstvo, Vol 149, Iss 11-12, Pp 685-

    2021  Volume 690

    Abstract: Introduction/Objective. Hearing impairment is the most common sensorineural disorder with an incidence of 1/700–1000 newborns. Variants in the GJB2 gene are the major cause of autosomal recessive nonsyndromic sensorineural hearing loss (ARNSHL). The ... ...

    Abstract Introduction/Objective. Hearing impairment is the most common sensorineural disorder with an incidence of 1/700–1000 newborns. Variants in the GJB2 gene are the major cause of autosomal recessive nonsyndromic sensorineural hearing loss (ARNSHL). The degree of hearing impairment in patients with detected mutations in GJB2 gene ranges from mild to profound. The aim of this study was to determine possible genotype–phenotype association between audiometric characteristics and detected genotypes in ARNSHL patients from Serbia. Methods. Ninety-two patients with ARNSHL underwent genetic analysis with amplification-refractory mutation system polymerase chain reaction and sequencing of the GJB2 gene. Audiological analyses were obtained in all patients using a combination of several methods to estimate the degree of hearing loss. Results. Audiological analysis performed in the 92 probands showed moderate to profound range of hearing loss. All identified pathogenic variants accounted for 42.39% of the mutant alleles (78/184 alleles), with the c.35delG mutation being the most frequent one (30.43%). Genotype–phenotype correlation in an isolated group of 37 patients bearing c.35delG in the homozygous, compound heterozygous, or heterozygous state. In this group the majority of patients (30/37, 81.08%) exhibited severe to profound hearing deficit. Conclusion. Association between genotype and the degree of hearing impairment in patients analyzed in this study demonstrated that patients with bi-allelic truncating mutations, i.e., c.35delG, associate with the more severe hearing loss when compared with those identified with only one affected allele. The various degrees of hearing impairment observed in heterozygous patients could be explained by the presence of an undetected second mutation or other modifier genes or environmental causes.
    Keywords hearing impairment ; gjb2 gene ; c.35delg variant ; audiological features ; Medicine ; R
    Subject code 616
    Language English
    Publishing date 2021-01-01T00:00:00Z
    Publisher Serbian Medical Society
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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