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Millan AL, Trobo SI, de Dios A, Cerrato García M, Pérez MS, Cerrone GE, Frechtel GD, López AP. MODY patients exhibit shorter telomere length than non-diabetic subjects. Diabetes Metab Res Rev 2021; 37:e3374. [PMID: 32588935 DOI: 10.1002/dmrr.3374] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Revised: 05/27/2020] [Accepted: 06/17/2020] [Indexed: 01/02/2023]
Abstract
BACKGROUND Given the increasing evidence supporting the association between telomere shortening and diabetes, the aim of the present work was to establish whether MODY patients suffer a reduction in telomere lenght (TL) due to oxidative stress produced by chronic hyperglycemia, despite not presenting insulin resistance or inflammation. METHODS We analysed clinical and biochemical parameters in 35 MODY2 and 12 MODY3 patients compared with 48 control subjects. The absolute telomere length (aTL) of peripheral blood leukocytes was measured using the quantitative polymerase chain reaction (qPCR). RESULTS A significant negative correlation was observed between aTL and age in the whole population, among MODY patients and in each subtype studied, MODY2 and MODY3, which allowed us to validate the method. We found, for the first time, that MODY patients have shorter aTL with respect to non-diabetic controls (6.49 ± 3.31 kbp vs 11.13 ± 7.82 kbp, p = .006). However, no differences were found between MODY2 and MODY3. In addition, aTL showed a negative correlation with duration of the disease and fasting plasma glucose (FPG) levels in MODY patients in general and also with HbA1c in MODY2 patients in particular. CONCLUSIONS Both MODY2 and MODY3 types present telomere shortening, which, at least partly, responds to HbA1c and FPG levels. These findings suggest comparable mechanisms underlying the attrition of TL. Taken together, our results on aTL in MODY patients may provide a parameter relatively easy and inexpensive to quantify in order to measure the impact of high glucose levels and potentially carry out antidiabetic treatment with stricter targets.
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Affiliation(s)
- Andrea L Millan
- Facultad de Farmacia y Bioquímica, Laboratorio de Diabetes y Metabolismo, Instituto de Inmunología, Genética y Metabolismo (INIGEM-UBA-CONICET), Universidad de Buenos Aires, Buenos Aires, Argentina
- Facultad de Farmacia y Bioquímica, Cátedra de Genética y Biología Molecular, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Sofía I Trobo
- Facultad de Farmacia y Bioquímica, Cátedra de Genética y Biología Molecular, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Alejandro de Dios
- Hospital de Clínicas José de San Martín, Facultad de Medicina, División Nutrición, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Martina Cerrato García
- Facultad de Farmacia y Bioquímica, Cátedra de Genética y Biología Molecular, Universidad de Buenos Aires, Buenos Aires, Argentina
| | | | - Gloria E Cerrone
- Facultad de Farmacia y Bioquímica, Laboratorio de Diabetes y Metabolismo, Instituto de Inmunología, Genética y Metabolismo (INIGEM-UBA-CONICET), Universidad de Buenos Aires, Buenos Aires, Argentina
- Facultad de Farmacia y Bioquímica, Cátedra de Genética y Biología Molecular, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Gustavo D Frechtel
- Facultad de Farmacia y Bioquímica, Laboratorio de Diabetes y Metabolismo, Instituto de Inmunología, Genética y Metabolismo (INIGEM-UBA-CONICET), Universidad de Buenos Aires, Buenos Aires, Argentina
- Facultad de Farmacia y Bioquímica, Cátedra de Genética y Biología Molecular, Universidad de Buenos Aires, Buenos Aires, Argentina
- Hospital de Clínicas José de San Martín, Facultad de Medicina, División Nutrición, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Ariel P López
- Facultad de Farmacia y Bioquímica, Laboratorio de Diabetes y Metabolismo, Instituto de Inmunología, Genética y Metabolismo (INIGEM-UBA-CONICET), Universidad de Buenos Aires, Buenos Aires, Argentina
- Facultad de Farmacia y Bioquímica, Cátedra de Genética y Biología Molecular, Universidad de Buenos Aires, Buenos Aires, Argentina
- Hospital de Clínicas José de San Martín, Facultad de Medicina, Programa de Biología Molecular, Universidad de Buenos Aires, Buenos Aires, Argentina
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Abruzzese GA, Gamez J, Belli SH, Levalle OA, Mormandi E, Otero P, Graffigna MN, Cerrone GE, Motta AB. Increased chemerin serum levels in hyperandrogenic and normoandrogenic women from Argentina with polycystic ovary syndrome. Gynecol Endocrinol 2020; 36:1057-1061. [PMID: 32496833 DOI: 10.1080/09513590.2020.1769061] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
Abstract
AIM To assess serum chemerin levels and investigate the association of chemerin with the hyperandrogenic and normoandrogenic phenotypes of Polycystic Ovary Syndrome (PCOS) and with the metabolic status of the analyzed population. MATERIAL AND METHODS A cross-sectional study was conducted on 106 women with PCOS and 60 healthy controls from Argentina. Patients were classified as showing a hyperandrogenic or normoandrogenic phenotype. Participants underwent anthropometric and clinical evaluation and markers of cardiovascular risk, insulin resistance, metabolic syndrome (MS), and serum chemerin levels were assessed. RESULTS PCOS patients showed increased levels of chemerin. In adjusted models for age and body mass index (BMI), chemerin was associated with markers of metabolic status. The analysis of chemerin levels considering the cutoff values of BMI, homeostatic model of insulin sensitivity (HOMA-IR) and TG/HDL marker showed that PCOS patients always presented higher levels of chemerin than controls. PCOS group showed increased chemerin levels independently of the presence of MS. CONCLUSION PCOS patients always showed increased levels of chemerin independently of their phenotype and presence of overweight, as well as higher levels of chemerin than controls when considering the cutoff values of HOMA-IR and TG/HDL. Therefore, argentine women with PCOS display increased chemerin levels independently of their metabolic or androgenic status.
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Affiliation(s)
- Giselle A Abruzzese
- Laboratorio de Fisio-patología OváricaCentro de Estudios Farmacológicos y Botánicos (CEFYBO), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Facultad de Medicina, Universidad de Buenos Aires (UBA), Buenos Aires, Argentina
| | - Juan Gamez
- División de Endocrinología, Hospital Carlos Durand, Buenos Aires, Argentina
| | - Susana H Belli
- División de Endocrinología, Hospital Carlos Durand, Buenos Aires, Argentina
| | - Oscar A Levalle
- División de Endocrinología, Hospital Carlos Durand, Buenos Aires, Argentina
| | - Eduardo Mormandi
- División de Endocrinología, Hospital Carlos Durand, Buenos Aires, Argentina
| | - Patricia Otero
- División de Endocrinología, Hospital Carlos Durand, Buenos Aires, Argentina
| | - Mabel N Graffigna
- División de Endocrinología, Hospital Carlos Durand, Buenos Aires, Argentina
| | - Gloria E Cerrone
- Cátedra de Genética, Departamento de Microbiología, Inmunología y Biotecnología, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires e Instituto de Inmunología, Genética y Metabolismo (CONICET-UBA). Buenos Aires, Argentina
| | - Alicia B Motta
- Laboratorio de Fisio-patología OváricaCentro de Estudios Farmacológicos y Botánicos (CEFYBO), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Facultad de Medicina, Universidad de Buenos Aires (UBA), Buenos Aires, Argentina
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3
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Yohena S, Penas-Steinhardt A, Muller C, Faccinetti NI, Cerrone GE, Lovecchio S, Ridner E, Valdez S, Frechtel G. Immunological and clinical characteristics of latent autoimmune diabetes in the elderly. Diabetes Metab Res Rev 2019; 35:e3137. [PMID: 30743316 DOI: 10.1002/dmrr.3137] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [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: 08/27/2018] [Revised: 01/25/2019] [Accepted: 01/29/2019] [Indexed: 12/16/2022]
Abstract
BACKGROUND Latent autoimmune diabetes in adults (LADA) is determined by both a noninsulin-dependent clinical presentation and an autoimmune pathogenic process. Glutamic acid decarboxylase antibody (GADA) constitutes the most important marker, although IA-2A and ZnT8A also define LADA presentation. Type 2 diabetes mellitus (T2DM) is the most prevalent type particularly over 65 years old. Studies about autoimmunity in this age group are scarce. OBJECTIVE The aim of this work was to determine whether three autoantibodies for diabetes autoimmunity were present in elderly T2DM patients, and to assess the distinctive clinical features of autoantibody-positive patients. RESEARCH DESIGN AND METHODS We recruited 153 patients with diabetes with onset of diabetes after 65 years of age and a BMI under 30 kg/m2 . RESULTS The prevalence of at least one of the autoantibodies was 15.68% (24/153). The most prevalent autoantibody was GADA with 8.49% (13/153), followed by ZnT8A with 6.50% (10/153) and IA2A with 1.96% (3/153). The autoimmunity-positive group presented higher HbA1c (7.01 ± 1.98 vs 6.35 ± 1.01; P = 0.007) and more prevalent insulin therapy (25% vs 10.85%; P = 0.047). GADA-positive patients with diabetes presented higher FPG (7.79 ± 3.79 mmol/L vs 6.43 ± 1.6 mmol/L; P = 0.014) and insulin therapy more frequently (46% vs 10.71%; p = 0.015). GADA titre levels in the individuals with BMI under 27 kg/m2 were higher (35.00 ± 4.20) than those in the group with BMI over 27 kg/m2 (8.83 ± 3.041; P = 0.0005). CONCLUSION Autoantibodies GADA and Znt8A may be useful markers in identifying a subgroup of older patients with a clinical presentation of diabetes which could be characterized as latent autoimmune diabetes in the elderly.
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Affiliation(s)
- Silvina Yohena
- Sirio Libanés Hospital, Buenos Aires, Argentina
- University Institute of Health Sciences, Barcelo Foundation, Buenos Aires, Argentina
| | - Alberto Penas-Steinhardt
- University Institute of Health Sciences, Barcelo Foundation, Buenos Aires, Argentina
- National University of Luján, Department of Basic Sciences, Computational Genomics Laboratory, Luján, Buenos Aires, Argentina
| | | | - Natalia I Faccinetti
- Chair of Immunology, Faculty of Pharmacy and Biochemistry, Buenos Aires University, Buenos Aires, Argentina
| | - Gloria E Cerrone
- Institute of Immunology, Genetics and Metabolism, Clinical Hospital and Faculty of Pharmacy and Biochemistry, Buenos Aires University, Buenos Aires, Argentina
- Chair of Genetics, Faculty of Pharmacy and Biochemistry, Buenos Aires University, Buenos Aires, Argentina
| | - Silvia Lovecchio
- Sirio Libanés Hospital, Buenos Aires, Argentina
- University Institute of Health Sciences, Barcelo Foundation, Buenos Aires, Argentina
| | - Edgardo Ridner
- University Institute of Health Sciences, Barcelo Foundation, Buenos Aires, Argentina
| | - Silvina Valdez
- Chair of Immunology, Faculty of Pharmacy and Biochemistry, Buenos Aires University, Buenos Aires, Argentina
| | - Gustavo Frechtel
- Sirio Libanés Hospital, Buenos Aires, Argentina
- University Institute of Health Sciences, Barcelo Foundation, Buenos Aires, Argentina
- Institute of Immunology, Genetics and Metabolism, Clinical Hospital and Faculty of Pharmacy and Biochemistry, Buenos Aires University, Buenos Aires, Argentina
- Chair of Genetics, Faculty of Pharmacy and Biochemistry, Buenos Aires University, Buenos Aires, Argentina
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Tetzlaff WF, Meroño T, Botta EE, Martín ME, Sorroche PB, Boero LE, Castro M, Frechtel GD, Rey J, Daruich J, Cerrone GE, Brites F. - 174 G>C IL-6 polymorphism and primary iron overload in male patients. Ann Hematol 2018; 97:1683-1687. [PMID: 29656314 DOI: 10.1007/s00277-018-3333-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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: 01/11/2018] [Accepted: 04/05/2018] [Indexed: 12/26/2022]
Abstract
Primary iron overload (IO) is commonly associated with mutations in the hereditary hemochromatosis gene (HFE). Nonetheless, other genetic variants may influence the development of IO beyond HFE mutations. There is a single nucleotide polymorphism (SNP) at - 174 G>C of the interleukin (IL)-6 gene which might be associated with primary IO. Our aim was to study the association between the SNP - 174 G>C gene promoter of IL-6 and primary IO in middle-aged male patients. We studied 37 men with primary IO diagnosed by liver histology. Controls were age-matched male volunteers (n = 37). HFE mutations and the SNP - 174 G>C gene promoter of IL-6 were evaluated by PCR-RFLP. Logistic regression was used to evaluate the association between primary IO and SNP - 174 G>C gene promoter of IL-6. Patients and control subjects were in Hardy-Weinberg equilibrium for the SNP - 174 G>C gene promoter of IL-6 (p = 0.17). Significantly different genotype frequencies were observed between patients (43% CC, 43% CG, and 14% GG) and control subjects (10% CC, 41% CG, and 49% GG) (OR = 4.09, 95% CI = 2.06-8.13; p < 0.0001). The multiple logistic regression analysis showed that IO was significantly associated with CC homozygosis in the SNP - 174 G>C gene promoter of IL-6 (OR = 6.3, 95% CI = 1.9-21.4; p < 0.005) in a model adjusted by age and body mass index. In conclusion, CC homozygosis in the SNP - 174 G>C gene promoter of IL-6 can be proposed as one of the gene variants influencing iron accumulation in male adults with HFE mutations. Studies in larger cohorts are warranted.
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Affiliation(s)
- Walter F Tetzlaff
- Laboratorio Lípidos y Aterosclerosis, Departamento de Bioquímica Clínica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956 (1113), Buenos Aires, Argentina. .,Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Instituto Fisiopatología y Bioquímica Clínica (INFIBIOC), Buenos Aires, Argentina.
| | - Tomás Meroño
- Laboratorio Lípidos y Aterosclerosis, Departamento de Bioquímica Clínica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956 (1113), Buenos Aires, Argentina.,Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Instituto Fisiopatología y Bioquímica Clínica (INFIBIOC), Buenos Aires, Argentina
| | - Eliana E Botta
- Laboratorio Lípidos y Aterosclerosis, Departamento de Bioquímica Clínica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956 (1113), Buenos Aires, Argentina.,Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Instituto Fisiopatología y Bioquímica Clínica (INFIBIOC), Buenos Aires, Argentina.,Consejo Nacional de Investigación Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Maximiliano E Martín
- Laboratorio Lípidos y Aterosclerosis, Departamento de Bioquímica Clínica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956 (1113), Buenos Aires, Argentina.,Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Instituto Fisiopatología y Bioquímica Clínica (INFIBIOC), Buenos Aires, Argentina
| | - Patricia B Sorroche
- Hospital Italiano de Buenos Aires, Laboratorio Central, Buenos Aires, Argentina
| | - Laura E Boero
- Laboratorio Lípidos y Aterosclerosis, Departamento de Bioquímica Clínica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956 (1113), Buenos Aires, Argentina.,Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Instituto Fisiopatología y Bioquímica Clínica (INFIBIOC), Buenos Aires, Argentina
| | - Marcelo Castro
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Instituto Fisiopatología y Bioquímica Clínica (INFIBIOC), Buenos Aires, Argentina.,Hospital de clínicas "José de San Martín", Departamento de Hemoterapia y Inmunohematología, División de Transfusión y Transmisión de enfermedades, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Gustavo D Frechtel
- CONICET, Instituto de Inmunología, Genética y Metabolismo (INIGEM), Laboratorio de Diabetes y Metabolismo, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Jorge Rey
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Instituto Fisiopatología y Bioquímica Clínica (INFIBIOC), Buenos Aires, Argentina.,Hospital de clínicas "José de San Martín", Departamento de Hemoterapia y Inmunohematología, División de Transfusión y Transmisión de enfermedades, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Jorge Daruich
- Hospital de clínicas "José de San Martín", Servicio de Gastroenterología, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Gloria E Cerrone
- CONICET, Instituto de Inmunología, Genética y Metabolismo (INIGEM), Laboratorio de Diabetes y Metabolismo, Universidad de Buenos Aires, Buenos Aires, Argentina.,Facultad de Farmacia y Bioquímica, Departamento de Microbiología, Inmunología y Biotecnología, Catedra de Genética, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Fernando Brites
- Laboratorio Lípidos y Aterosclerosis, Departamento de Bioquímica Clínica, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956 (1113), Buenos Aires, Argentina.,Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Instituto Fisiopatología y Bioquímica Clínica (INFIBIOC), Buenos Aires, Argentina.,Consejo Nacional de Investigación Científicas y Técnicas (CONICET), Buenos Aires, Argentina
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5
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Iglesias Molli AE, Panero J, Dos Santos PC, González CD, Vilariño J, Sereday M, Cerrone GE, Slavutsky I, Frechtel GD. Metabolically healthy obese women have longer telomere length than obese women with metabolic syndrome. PLoS One 2017; 12:e0174945. [PMID: 28384193 PMCID: PMC5383129 DOI: 10.1371/journal.pone.0174945] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Accepted: 03/18/2017] [Indexed: 11/21/2022] Open
Abstract
Introduction Obesity is the principal component in the Metabolic Syndrome (MetS) that determines the progression of metabolic complications. Metabolically healthy obese (MHO) individuals seem to be protected against those complications. Telomere length (TL) as a novel marker of cellular aging had a complex relationship to the MetS. The principal aim of this study was to investigate the TL in MHO, and to study the association between TL and the worsening of the metabolic condition. Material and methods We have determined the absolute TL (aTL) in 400 women (mean age of 46.76 ± 15.47 years; range: 18–86 years), grouped according to the metabolic condition in three groups: metabolically healthy non-obese women (MHNO), MHO and obese women with MetS (MSO); and grouped according to the number of components of MetS. Results We found that MHO displays significantly higher aTL than MSO (p = 0.033; r = -4.63; 95% CI r = -8.89 / -0.37), but did not differ from MHNO. A decrease in aTL with the progressive increase in the number of MetS components was also observed (p < 0.001; r = -2.06; 95% CI r = -3.13 / -0.99). In this way, our results indicate that aTL is influenced by the presence of MetS, but it is not affected by the presence of obesity. Discussion We found that shorter aTL is not associated with MHO, but is related to MetS and with the increased number of metabolic abnormalities.
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Affiliation(s)
- Andrea E. Iglesias Molli
- CONICET-Universidad de Buenos Aires. Instituto de Inmunología, Genética y Metabolismo (INIGEM). Laboratorio de Diabetes y Metabolismo. Buenos Aires, Argentina
- * E-mail:
| | - Julieta Panero
- Academia Nacional de Medicina. CONICET. Instituto de Medicina experimental (IMEX). Laboratorio de Genética de Neoplasias Linfoides. Buenos Aires, Argentina
| | - Patricia C. Dos Santos
- Academia Nacional de Medicina. CONICET. Instituto de Medicina experimental (IMEX). Laboratorio de Genética de Neoplasias Linfoides. Buenos Aires, Argentina
| | - Claudio D. González
- Universidad de Buenos Aires. Facultad de Medicina. Departamento de Farmacología. Cátedra II. Buenos Aires, Argentina
| | - Jorge Vilariño
- Hospital FLENI. Departamento de Cardiología. Buenos Aires, Argentina
| | - Marta Sereday
- Hospital Fiorito. Servicio de Endocrinología. Buenos Aires, Argentina
| | - Gloria E. Cerrone
- Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Departamento de Microbiología, Inmunología y Biotecnología. Cátedra de Genética. Buenos Aires, Argentina
| | - Irma Slavutsky
- Academia Nacional de Medicina. CONICET. Instituto de Medicina experimental (IMEX). Laboratorio de Genética de Neoplasias Linfoides. Buenos Aires, Argentina
| | - Gustavo D. Frechtel
- CONICET-Universidad de Buenos Aires. Instituto de Inmunología, Genética y Metabolismo (INIGEM). Laboratorio de Diabetes y Metabolismo. Buenos Aires, Argentina
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Scheps KG, Francipane L, Nevado J, Basack N, Attie M, Bergonzi MF, Cerrone GE, Lapunzina P, Varela V. Cover Image, Volume 170A, Number 4, April 2016. Am J Med Genet A 2016. [DOI: 10.1002/ajmg.a.37633] [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: 11/05/2022]
Affiliation(s)
- Karen G. Scheps
- Cátedra de Genética; Facultad de Farmacia y Bioquímica; Universidad de Buenos Aires; Ciudad de Buenos Aires Argentina
- INIGEM (Instituto de Inmunología, Genética y Metabolismo); CONICET- Universidad de Buenos Aires; Ciudad de Buenos Aires Argentina
| | - Liliana Francipane
- División Genética; Hospital de Clínicas “José de San Martín”; Universidad de Buenos Aires; Ciudad de Buenos Aires Argentina
| | - Julián Nevado
- INGEMM (Instituto de Genética Médica y Molecular); Hospital Universitario La Paz-IdiPaz; Universidad Autónoma de Madrid; Madrid Spain
- CIBERER (Centro de Investigación Biomédica en Red de Enfermedades Raras); Madrid; Spain
| | - Nora Basack
- División Hematología; Hospital de Niños “Dr. Ricardo Gutiérrez”; Ciudad de Buenos Aires Buenos Aires Argentina
| | - Myriam Attie
- División Hematología; Hospital de Niños “Dr. Ricardo Gutiérrez”; Ciudad de Buenos Aires Buenos Aires Argentina
| | - María Fernanda Bergonzi
- División Genética; Hospital de Clínicas “José de San Martín”; Universidad de Buenos Aires; Ciudad de Buenos Aires Argentina
| | - Gloria E. Cerrone
- Cátedra de Genética; Facultad de Farmacia y Bioquímica; Universidad de Buenos Aires; Ciudad de Buenos Aires Argentina
- INIGEM (Instituto de Inmunología, Genética y Metabolismo); CONICET- Universidad de Buenos Aires; Ciudad de Buenos Aires Argentina
| | - Pablo Lapunzina
- INGEMM (Instituto de Genética Médica y Molecular); Hospital Universitario La Paz-IdiPaz; Universidad Autónoma de Madrid; Madrid Spain
- CIBERER (Centro de Investigación Biomédica en Red de Enfermedades Raras); Madrid; Spain
| | - Viviana Varela
- Cátedra de Genética; Facultad de Farmacia y Bioquímica; Universidad de Buenos Aires; Ciudad de Buenos Aires Argentina
- INIGEM (Instituto de Inmunología, Genética y Metabolismo); CONICET- Universidad de Buenos Aires; Ciudad de Buenos Aires Argentina
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7
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Scheps KG, Francipane L, Nevado J, Basack N, Attie M, Bergonzi MF, Cerrone GE, Lapunzina P, Varela V. Multiple copy number variants in a pediatric patient with Hb H disease and intellectual disability. Am J Med Genet A 2016; 170A:986-91. [PMID: 26753516 DOI: 10.1002/ajmg.a.37532] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [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: 10/01/2015] [Accepted: 12/11/2015] [Indexed: 11/09/2022]
Abstract
Two distinct syndromes that link α-thalassemia and intellectual disability (ID) have been described: ATR-X, due to mutations in the ATRX gene, and ATR-16, a contiguous gene deletion syndrome in the telomeric region of the short arm of chromosome 16. A critical region where the candidate genes for the ID map has been established. In a pediatric patient with Hemoglobin H disease, dysmorphic features and ID, 4 novel and clinically relevant Copy Number Variants were identified. PCR-GAP, MLPA and FISH analyses established the cause of the α-thalassemia. SNP-array analysis revealed the presence of 4 altered loci: 3 deletions (arr[hg19]Chr16(16p13.3; 88,165-1,507,988) x1; arr[hg19]Chr6(6p21.1; 44,798,701-45,334,537) x1 and arr[hg19]Chr17(17q25.3; 80,544,855-81,057,996) x1) and a terminal duplication (arr[hg19]Chr7(7p22.3-p22.2; 4,935-4,139,785) x3). The -α(3.7) mutation and the ∼1.51 Mb in 16p13.3 are involved in the alpha-thalassemic phenotype. However, the critical region for ATR-16 cannot be narrowed down. The deletion affecting 6p21.1 removes the first 2 exons and part of intron 2 of the RUNX2 gene. Although heterozygous loss of function mutations affecting this gene have been associated with cleidocranial dysplasia, the patient does not exhibit pathognomonic signs of this syndrome, possibly due to the fact that the isoform d of the transcription factor remains unaffected. This work highlights the importance of searching for cryptic deletions in patients with ID and reiterates the need of the molecular analysis when it is associated to microcytic hypochromic anemia with normal iron status.
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Affiliation(s)
- Karen G Scheps
- Cátedra de Genética, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Ciudad de Buenos Aires, Argentina.,INIGEM (Instituto de Inmunología, Genética y Metabolismo), CONICET- Universidad de Buenos Aires, Ciudad de Buenos Aires, Argentina
| | - Liliana Francipane
- División Genética, Hospital de Clínicas "José de San Martín", Universidad de Buenos Aires, Ciudad de Buenos Aires, Argentina
| | - Julián Nevado
- INGEMM (Instituto de Genética Médica y Molecular), Hospital Universitario La Paz-IdiPaz, Universidad Autónoma de Madrid, Madrid, Spain.,CIBERER (Centro de Investigación Biomédica en Red de Enfermedades Raras), Madrid, Spain
| | - Nora Basack
- División Hematología, Hospital de Niños "Dr. Ricardo Gutiérrez", Ciudad de Buenos Aires, Buenos Aires, Argentina
| | - Myriam Attie
- División Hematología, Hospital de Niños "Dr. Ricardo Gutiérrez", Ciudad de Buenos Aires, Buenos Aires, Argentina
| | - María Fernanda Bergonzi
- División Genética, Hospital de Clínicas "José de San Martín", Universidad de Buenos Aires, Ciudad de Buenos Aires, Argentina
| | - Gloria E Cerrone
- Cátedra de Genética, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Ciudad de Buenos Aires, Argentina.,INIGEM (Instituto de Inmunología, Genética y Metabolismo), CONICET- Universidad de Buenos Aires, Ciudad de Buenos Aires, Argentina
| | - Pablo Lapunzina
- INGEMM (Instituto de Genética Médica y Molecular), Hospital Universitario La Paz-IdiPaz, Universidad Autónoma de Madrid, Madrid, Spain.,CIBERER (Centro de Investigación Biomédica en Red de Enfermedades Raras), Madrid, Spain
| | - Viviana Varela
- Cátedra de Genética, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Ciudad de Buenos Aires, Argentina.,INIGEM (Instituto de Inmunología, Genética y Metabolismo), CONICET- Universidad de Buenos Aires, Ciudad de Buenos Aires, Argentina
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8
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Scheps KG, Francipane L, Nash A, Cerrone GE, Copelli SB, Varela V. [Molecular bases of α-thalassemia in Argentina]. Medicina (B Aires) 2015; 75:81-86. [PMID: 25919868] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023] Open
Abstract
The α-thalassemia is one of the most common hereditary disorders worldwide. Currently, molecular diagnostics is the only available tool to achieve an accurate diagnosis. The purpose of this study was to characterize the molecular bases of these syndromes in our environment and to establish genotype-phenotype associations. Through a combination of different molecular techniques and fluorescent in situ hybridization (FISH),we were able to find α-thalassemic mutations in 145 of the 184 patients (78.8%) studied with hematological parameters compatible with α-thalassemia. Deletions of the α-globin genes resulted the major molecular cause of the disease, and the most frequent mutation was -α(3.7), found in homozygous and heterozygous genotypes. In patients with α° phenotypes, other prevalent mutations were( _MED) and (_CAL/CAMP). The description of a sub-telomeric deletion in a patient with α-thalassemia and mental retardation was also achieved. β-thalassemic mutations in heterozygous state were found in 7.6% of the patients, who presented α-thalassemic clinical features (microcytosis and Hb A₂levels below 3.5%). Hematologic profiles for the α+ and α° genotypes were established for adult and pediatric patients. Hopefully, this work will provide guidelines for the detection of possible α-thalassemic carriers. It also highlights the collaborative work of hematologists, the biochemical and molecular biology laboratory and genetists, in order to provide appropriate genetic counseling.
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Affiliation(s)
- Karen G Scheps
- Cátedra de Genética y Biología Molecular, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, INIGEM, CONICET-UBA, Argentina
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9
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Tellechea ML, Muzzio DO, Iglesias Molli AE, Belli SH, Graffigna MN, Levalle OA, Frechtel GD, Cerrone GE. Association between β2-adrenoceptor (ADRB2) haplotypes and insulin resistance in PCOS. Clin Endocrinol (Oxf) 2013; 78:600-6. [PMID: 22900502 DOI: 10.1111/cen.12019] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/08/2012] [Revised: 05/23/2012] [Accepted: 08/14/2012] [Indexed: 11/30/2022]
Abstract
OBJECTIVE The aim of this study was to explore β2-adrenoceptor (ADRB2) haplotype associations with phenotypes and quantitative traits related to insulin resistance (IR) and the metabolic syndrome (MS) in a polycystic ovary syndrome (PCOS) population. A secondary purpose was to assess the association between ADRB2 haplotype and PCOS. DESIGN Genetic polymorphism analysis. Cross-sectional case-control association study. SETTING Medical University Hospital and research laboratory. PATIENTS One hundred and sixty-five unrelated women with PCOS and 116 unrelated women without PCOS (control sample). MEASUREMENTS Clinical and biochemical measurements, and ADRB2 genotyping in PCOS patients and control subjects. METHODS ADRB2 haplotypes (comprising rs1042711, rs1801704, rs1042713 and rs1042714 in that order), genotyping and statistical analysis to evaluate associations with continuous variables and traits related to IR and MS in a PCOS population. Associations between ADRB2 haplotypes and PCOS were also assessed. RESULTS We observed an age-adjusted association between ADRB2 haplotype CCGG and lower insulin (P = 0·018) and HOMA (P = 0·008) in the PCOS sample. Interestingly, the expected differences in surrogate measures of IR between cases and controls were not significant in CCGG/CCGG carriers. In the case-control study, genotype CCGG/CCGG was associated with a 14% decrease in PCOS risk (P = 0·043), taking into account confounding variables. CONCLUSIONS Haplotype I (CCGG) has a protective role for IR and MS in PCOS.
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Affiliation(s)
- Mariana L Tellechea
- Genetics and Molecular Biology, Department of Microbiology, Immunology and Biotechnology, School of Pharmacy and Biochemistry, University of Buenos Aires (UBA), Buenos Aires, Argentina
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10
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Tellechea ML, Aranguren F, Pérez MS, Cerrone GE, Frechtel GD, Taverna MJ. Pro12Ala polymorphism of the peroxisome proliferatoractivated receptor-gamma gene is associated with metabolic syndrome and surrogate measures of insulin resistance in healthy men: interaction with smoking status. Circ J 2009; 73:2118-24. [PMID: 19745552 DOI: 10.1253/circj.cj-09-0320] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [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: 01/19/2023]
Abstract
BACKGROUND The Pro12Ala polymorphism (rs1801282), a nonsynonymous substitution of peroxisome proliferator-activated receptor-gamma (PPARG), has been robustly associated with type 2 diabetes. However, its role in metabolic syndrome (MetS) remains poorly understood. The associations among rs1801282, MetS and surrogate measures of insulin resistance (IR) were investigated in the present study. METHODS AND RESULTS A cross-sectional population-based survey of 572 unrelated healthy male Argentinian blood donors with normal findings on medical examination and not taking any medication was conducted. MetS was assessed using the National Cholesterol Education Program/Adult Treatment Panel III (NCEP/ATP III) criteria, and the HOMA-IR, and QUICKI were calculated. Genotyping of rs1801282 was performed using RFLP-PCR. The prevalence of MetS was 26.2%. The Pro/Ala genotype (and the Ala12 allele) was associated with a high risk for MetS (odds ratio (OR) 1.67 [95% confidence interval (CI) 1.03-2.72], P=0.0394). This was highlighted among nonsmokers (OR 2.20 [95%CI 1.25-3.88], P=0.0059). ANCOVA confirmed an interaction between smoking status and this association (P=0.031). Ala12 carriers had a higher waist circumference than noncarriers (P=0.0065). Among nonsmokers, surrogates of IR, such as HOMA-IR, were significantly higher in Ala12 carriers than in noncarriers (P<0.05). CONCLUSIONS Healthy men, in particular nonsmokers, carrying the Ala12 allele of PPARG rs1801282 polymorphism, have a high risk for MetS and IR.
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Affiliation(s)
- Mariana L Tellechea
- Laboratory of Molecular Biology, Department of Genetics and Molecular Biology, School of Pharmacy and Biochemistry, University of Buenos Aires, Buenos Aires, Argentina
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Pérez MS, Cerrone GE, Benencia H, Márquez N, De Piano E, Frechtel GD. [Polymorphism in CYP11alpha and CYP17 genes and the etiology of hyperandrogenism in patients with polycystic ovary syndrome]. Medicina (B Aires) 2008; 68:129-134. [PMID: 18499961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023] Open
Abstract
The polycystic ovary syndrome (PCOS) is a heterogeneous multifactorial endocrine metabolic disorder with genetic predisposition affecting 6% of women in the reproductive age. This syndrome is characterized by the presence of oligo-anovulation, hyperandrogenism and polycystic ovaries. Several genes have been postulated as responsible for the etiology of this disorder. Among these genes are those encoding the enzymes involved in the ovarian androgen biosynthesis. Two of the candidate genes are the CYP17 and the CYP11alpha, encoding the 17-alpha-hydroxylase (P45017alpha) and the cholesterol side chain cleavage (P450scc) respectively. The polymorphisms of these genes are linked to the development of an hyperandrogenic phenotype. The aim of this work was to analyze the allelic frequencies of such polymorphisms in a cohort of women with PCOS and to compare them with those of healthy women. Furthermore, the correlation between each allelic variant and the corresponding hyperandrogenic phenotype was also assessed. Therefore, 65 patients and 58 age matched healthy controls were analyzed. The serum levels of testosterone and the frequency of each polymorphism were determined. When the PCOS population was analyzed, a significant statistical difference was found when relating the group with the highest androgenemia level with the presence of A2/A2 genotype of CYP 17 gene, and a higher level of circulating androgen was found in PCO women carrying the 216- allele of CYP11alpha gene (that did not reach statistical significance). Our results suggest that both alleles play a minor role in the development of PCOS and could be a genetic risk marker of the hyperandrogenic phenotype.
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Affiliation(s)
- María S Pérez
- Cátedra de Genética y Biología Molecular, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Argentina
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12
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Cerrone GE, Pérez MS, Caputo M, Targovnik HM, Frechtel GD. A simple method for the identification of three major haplotypes of the β2AR. Mol Cell Probes 2007; 21:222-5. [PMID: 17303378 DOI: 10.1016/j.mcp.2006.12.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2006] [Accepted: 12/22/2006] [Indexed: 11/23/2022]
Abstract
We have developed a simple and efficient SSCP (single strand conformational polymorphism) method for haplotype determination of beta2AR using four polymorphisms. The six different SSCP patterns were grouped into three major haplotypes named I, II and III. We studied a population of 199 individuals displaying all the haplotypes: 34.9% (group I), 36.1% (group II) and 29.5% (group III). This population was subdivided into three groups: normal weight, overweight and obese individuals. There were no significant differences between the haplotypes of normal and overweight individuals. The haplotype frequencies in the group of normal weight subjects were 39% (I), 33% (II) and 28% (III). The overweight individuals presented frequencies of 38% (I), 33% (II) and 29% (III). The obese group showed marked differences for haplotypes I and II: 27.1% (I), 43.2% (II) and 29.7% (III) when compared to the normal weight group. For haplotype I the p value of normal to obese groups was 0.0403 with an odds ratio of 0.5761. Our two step SSCP method for beta2AR haplotyping is simple, accurate and cost effective for studying large populations and may be a useful tool for easy and accurate identification of haplotype I which appears to have a protective role against developing obesity.
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Affiliation(s)
- Gloria E Cerrone
- Laboratory of Molecular Biology, Department of Genetics and Molecular Biology, School of Pharmacy and Biochemistry, University of Buenos Aires, Junín 956, C1113AAD, Capital Federal, Buenos Aires, Argentina.
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Thevenet PS, Jensen O, Drut R, Cerrone GE, Grenóvero MS, Alvarez HM, Targovnik HM, Basualdo JA. Viability and infectiousness of eggs of Echinococcus granulosus aged under natural conditions of inferior arid climate. Vet Parasitol 2005; 133:71-7. [PMID: 15994009 DOI: 10.1016/j.vetpar.2005.05.048] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2005] [Revised: 05/13/2005] [Accepted: 05/18/2005] [Indexed: 11/27/2022]
Abstract
We studied the viability and infectiousness of aged Echinococcus granulosus eggs by in vivo evaluation in ovines. Our results demonstrated that after 41 months of ageing of the eggs under environmental conditions of an inferior arid climate (Patagonia, Argentina), they were still able to produce infection in 4/4 ovines challenged with 1200 eggs per ovine. In the ovines experimentally infected with these aged eggs, the occurrence of hepatic and pulmonary cysts was determined by necropsy, histologic and genetic studies. The eggs were found in a semi-senescent stage, thus keeping their capacity to generate an infection in the intermediary ovine host.
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Affiliation(s)
- Paula Sánchez Thevenet
- Departamento de Bioquímica, School of Natural Science, Facultad de Ciencias Naturales, Universidad Nacional de la Patagonia San Juan Bosco, Piso 2 Ciudad Universitaria Km. 4, Comodoro Rivadavia, Chubut 9000, Argentina.
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Caputo M, Cerrone GE, Lopez AP, Gonzalez C, Mazza C, Cedola N, Puchulu FM, Targovnik HM, Frechtel GD. [HLA DQB1 genotyping in latent autoimmune diabetes of adults (LADA)]. Medicina (B Aires) 2005; 65:235-40. [PMID: 16042135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2023] Open
Abstract
Autoimmune diabetes is a complex, multifactorial disease caused by the interaction of genetic and environmental factors. This autoimmune diabetes is commonly manifested in childhood and adolescence with a fast onset (type 1 diabetes, IDDM) and it can occur in adult patients with a slow onset with delayed insulin requirement, (latent autoimmune diabetes in adults, LADA ). Autoimmune diabetes has strong class II HLA association mainly with DQB gene which constitutes the first susceptibility locus. However, association with the 5'INS- VNTR and CTLA-4 genes has been established. In this study, we analysed the polimorphic allele frequencies of DQB HLA gene in 63 LADA patients, 70 IDDM and 79 control subjects. The HLA DQB1 alleles typing was detected through Olerup SSP DQ kit using sequence specific primers. We observed a positive association of *0201-*0302 and *0201-*0201 genotypes in both types of diabetic patients compared to the control group (p < 0.05). Moreover, *0201-*0302 genotype was higher in IDDM than in LADA (p < 0.05). On the other hand, the *0602 protective allele analysis showed a high prevalence in the normal group compared to the diabetic population. In Argentina, the most frequent allele of susceptibility in LADA and IDDM patients was the *0201. Summing up, the finding of an increase in the *0201 allele, both in allelic and genotypic frequencies, allows the characterisation of our population of patients, LADA and IDDM, unlike other populations, in which the most frequent allele is *0302.
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Affiliation(s)
- Mariela Caputo
- Cátedra de Genética y Biología Molecular, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Argentina.
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Targovnik HM, Vono J, Billerbeck AE, Cerrone GE, Varela V, Mendive F, Wajchenberg BL, Medeiros-Neto G. A 138-nucleotide deletion in the thyroglobulin ribonucleic acid messenger in a congenital goiter with defective thyroglobulin synthesis. J Clin Endocrinol Metab 1995; 80:3356-60. [PMID: 7593451 DOI: 10.1210/jcem.80.11.7593451] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Two siblings (HSN and AcSN) with congenital goitrous hypothyroidism were investigated in terms of clinical, biochemical, and molecular biology. Diagnosis of defective thyroglobulin (Tg) was based on findings of low serum T4, low normal or normal serum T3, a negative percholate discharge test, and the virtual absence of the serum Tg response to challenge by bovine TSH. Only minute amounts of Tg-related antigens were detected by RIA in the goitrous tissue (HSN, 0.82 mg/g, compared to 70-90 mg/g in normal thyroid tissue), as confirmed by sodium dodecyl sulfate-agarose gel electrophoresis that indicated the virtual absence of Tg. The Tg messenger ribonucleic acids (mRNAs) from controls and HSN thyroid tissue were first reverse transcribed and then divided into several portions from positions 57-8448; the resulting complementary DNAs were, in turn, amplified by reverse polymerase chain reaction. The amplification of nucleotides 5165-6048 from control thyroid tissue Tg mRNA showed a fragment of 884 base pairs (bp). In contrast, the fragment present in the HSN was +/- 750 bp and lacked the normal fragment. The sequencing of the smaller fragment revealed that 138 bp were missing between positions 5590-5727 of the HSN Tg mRNA. This deletion does not affect the reading frame of the resulting mRNA and is potentially fully translatable into a Tg polypeptide chain that is shorter by 46 residues. A cysteine residue is maintained by the junction between the proximal T from leucine 1831 and the distal GT from cysteine 1877. DNA genomic polymerase chain reaction amplification excludes a deletion in the Tg gene and indicates that the deleted 138-nucleotide sequences lie in the same exon. The functional consequences of the deletion are not entirely clear, but it is conceivable that the excision of this segment of the Tg molecule could affect the protein structure, resulting in its premature degradation, very low colloid storage, and diminished thyroid hormone production rate.
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Affiliation(s)
- H M Targovnik
- Laboratorio de Biología Molecular, Hospital de Clínicas José de San Martín, Facultad de Medicina, Universidad de Buenos Aires, Argentina
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Targovnik HM, Varela V, Frechtel GD, Cerrone GE, Copelli SB, Propato FV, Mendive F. Molecular genetics of hereditary thyroid diseases due to a defect in the thyroglobulin or thyroperoxidase synthesis. Braz J Med Biol Res 1994; 27:2745-57. [PMID: 7549998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
1. Hereditary goiter and the various degrees of thyroid hypofunction are the result of structural changes in the thyroglobulin (Tg) or thyroperoxidase (TPO) proteins, the inability to couple iodotyrosines or defective iodination, impairing or substantially altering the synthesis of T4 and T3. 2. The first mutations in the Tg and TPO genes responsible for human cases of dyshormonogenesis have been described. The mutation in two siblings with hereditary goiter and marked impairment of Tg synthesis was a cytosine to thymine transition creating a stop codon at position 1510. The point mutation is removed by the preferential accumulation of a 171-nt deleted Tg mRNA. In another subject, molecular studies revealed that exon 4 was missing from the major Tg transcript due to a cytosine to guanine transversion at position minus 3 in the acceptor splice site of intron 3. 3. Genomic DNA studies identified a duplication of a 4-base sequence in the eighth exon of the TPO gene. Interestingly, besides abolishing the enzymatic activity by disrupting the reading frame of the messenger RNA and introducing stop codons, the GGCC duplication also unmasks a cryptic acceptor splice site in exon 9. 4. In conclusion, the identification of different molecular defects provided evidence that hereditary goiter associated with abnormal Tg or TPO synthesis is caused by heterogeneous genetic alterations.
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Affiliation(s)
- H M Targovnik
- Cátedra de Genética y Biología Molecular, Hospital de Clinicas José de San Martín, Facultad de Farmacie y Bioquímica, Universidad de Buenos Aires, Argentina
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