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Sun G, Cao H, Bai Y, Wang J, Zhou Y, Li K, Xiao JH. A novel multiplex qPCR method for assessing the comparative lengths of telomeres. J Clin Lab Anal 2021; 35:e23929. [PMID: 34347924 PMCID: PMC8418462 DOI: 10.1002/jcla.23929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 06/21/2021] [Accepted: 07/20/2021] [Indexed: 11/10/2022] Open
Abstract
Background The comparative length of telomeres is considered to be related to diseases such as cancer, aging, and cardiovascular diseases. qPCR is currently one of the main methods for detecting telomere length. However, due to the unique sequence of telomeres (highly repetitive six‐base sequence), it is difficult to design primers and probes to expand and detect telomere and to put internal reference gene and telomere into the same tube for detection to reduce the possible inter‐pore errors and improve amplification efficiency. Besides, the stability and accuracy of the test results are greatly affected by the difference between reference genes and telomere copy number. Methods In this study, the single‐copy genes were replaced with high‐copy genes (300 copies) as the internal control to reduce the copy number difference of the internal genes and telomere. In addition, a multiplex qPCR system was constructed to detect the telomeres and an internal reference gene product. We also detected the lengths of telomeres in the genomic DNA in immortalized cells (293T and Hela) from different generations of cells. Results We detected the comparative telomere lengths of 1500 random Chinese volunteers of different ages with the multiplex qPCR method; the result shows that the comparative length of telomeres is negatively related to age. In addition, we compared our qPCR detection method with a terminal restriction fragmentation (TRF) method. Both of them were highly consistent, indicating that the qPCR method was reliable. Conclusions In conclusion, we developed a stable, convenient, and accurate comparative telomere length detection method.
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Affiliation(s)
- Guozhu Sun
- School of Chemistry and Bioengineering, Donghua University, Shanghai, China
| | - Hui Cao
- Department of Clinical Laboratory, Shanghai Songjiang District Central Hospital, Shanghai, China
| | - Yang Bai
- Shanghai Biowing Applied Biotechnology CO.LTD, Shanghai, China
| | - Jueheng Wang
- School of Chemistry and Bioengineering, Donghua University, Shanghai, China
| | - Yuxun Zhou
- School of Chemistry and Bioengineering, Donghua University, Shanghai, China
| | - Kai Li
- School of Chemistry and Bioengineering, Donghua University, Shanghai, China
| | - Jun-Hua Xiao
- School of Chemistry and Bioengineering, Donghua University, Shanghai, China
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Lindrose AR, McLester-Davis LWY, Tristano RI, Kataria L, Gadalla SM, Eisenberg DTA, Verhulst S, Drury S. Method comparison studies of telomere length measurement using qPCR approaches: A critical appraisal of the literature. PLoS One 2021; 16:e0245582. [PMID: 33471860 PMCID: PMC7817045 DOI: 10.1371/journal.pone.0245582] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Accepted: 01/05/2021] [Indexed: 12/16/2022] Open
Abstract
Use of telomere length (TL) as a biomarker for various environmental exposures and diseases has increased in recent years. Various methods have been developed to measure telomere length. Polymerase chain reaction (PCR)-based methods remain wide-spread for population-based studies due to the high-throughput capability. While several studies have evaluated the repeatability and reproducibility of different TL measurement methods, the results have been variable. We conducted a literature review of TL measurement cross-method comparison studies that included a PCR-based method published between January 1, 2002 and May 25, 2020. A total of 25 articles were found that matched the inclusion criteria. Papers were reviewed for quality of methodologic reporting of sample and DNA quality, PCR assay characteristics, sample blinding, and analytic approaches to determine final TL. Overall, methodologic reporting was low as assessed by two different reporting guidelines for qPCR-based TL measurement. There was a wide range in the reported correlation between methods (as assessed by Pearson’s r) and few studies utilized the recommended intra-class correlation coefficient (ICC) for assessment of assay repeatability and methodologic comparisons. The sample size for nearly all studies was less than 100, raising concerns about statistical power. Overall, this review found that the current literature on the relation between TL measurement methods is lacking in validity and scientific rigor. In light of these findings, we present reporting guidelines for PCR-based TL measurement methods and results of analyses of the effect of assay repeatability (ICC) on statistical power of cross-sectional and longitudinal studies. Additional cross-laboratory studies with rigorous methodologic and statistical reporting, adequate sample size, and blinding are essential to accurately determine assay repeatability and replicability as well as the relation between TL measurement methods.
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Affiliation(s)
- Alyssa R. Lindrose
- Department of Psychiatry and Behavioral Sciences, School of Medicine, Tulane University, New Orleans, Louisiana, United States of America
- * E-mail: (ARL); (SD)
| | | | - Renee I. Tristano
- School of Public Health and Tropical Medicine, Tulane University, New Orleans, Louisiana, United States of America
| | - Leila Kataria
- School of Science and Engineering, Tulane University, New Orleans, Louisiana, United States of America
| | - Shahinaz M. Gadalla
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Dan T. A. Eisenberg
- Department of Anthropology, Department of Biology, Center for Studies in Demography and Ecology, University of Washington, Seattle, Washington, United States of America
| | - Simon Verhulst
- Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands
| | - Stacy Drury
- Department of Psychiatry and Behavioral Sciences, School of Medicine, Tulane University, New Orleans, Louisiana, United States of America
- Tulane Brain Institute, Tulane University, New Orleans, Louisiana, United States of America
- Department of Pediatrics, School of Medicine, Tulane University, New Orleans, Louisiana, United States of America
- * E-mail: (ARL); (SD)
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Dos Santos PC, Panero J, Stanganelli C, Palau Nagore V, Stella F, Bezares R, Slavutsky I. Dysregulation of H/ACA ribonucleoprotein components in chronic lymphocytic leukemia. PLoS One 2017; 12:e0179883. [PMID: 28666010 PMCID: PMC5493334 DOI: 10.1371/journal.pone.0179883] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Accepted: 06/06/2017] [Indexed: 11/18/2022] Open
Abstract
Telomeres are protective repeats of TTAGGG sequences located at the end of human chromosomes. They are essential to maintain chromosomal integrity and genome stability. Telomerase is a ribonucleoprotein complex containing an internal RNA template (hTR) and a catalytic subunit (hTERT). The human hTR gene consists of three major domains; among them the H/ACA domain is essential for telomere biogenesis. H/ACA ribonucleoprotein (RNP) complex is composed of four evolutionary conserved proteins, including dyskerin (encoded by DKC1 gene), NOP10, NHP2 and GAR1. In this study, we have evaluated the expression profile of the H/ACA RNP complex genes: DKC1, NOP10, NHP2 and GAR1, as well as hTERT and hTR mRNA levels, in patients with chronic lymphocytic leukemia (CLL). Results were correlated with the number and type of genetic alteration detected by conventional cytogenetics and FISH (fluorescence in situ hybridization), IGHV (immunoglobulin heavy chain variable region) mutational status, telomere length (TL) and clinico-pathological characteristics of patients. Our results showed significant decreased expression of GAR1, NOP10, DKC1 and hTR, as well as increased mRNA levels of hTERT in patients compared to controls (p≤0.04). A positive correlation between the expression of GAR1-NHP2, GAR1-NOP10, and NOP10-NHP2 (p<0.0001), were observed. The analysis taking into account prognostic factors showed a significant increased expression of hTERT gene in unmutated-IGHV cases compared to mutated-CLL patients (p = 0.0185). The comparisons among FISH groups exhibited increased expression of DKC1 in cases with two or more alterations with respect to no abnormalities, trisomy 12 and del13q14, and of NHP2 and NOP10 compared to those with del13q14 (p = 0.03). The analysis according to TL showed a significant increased expression of hTERT (p = 0.0074) and DKC1 (p = 0.0036) in patients with short telomeres compared to those with long TL. No association between gene expression and clinical parameters was found. Our results suggest a role for these telomere associated genes in genomic instability and telomere dysfunction in CLL.
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Affiliation(s)
- Patricia Carolina Dos Santos
- Laboratorio de Genética de Neoplasias Linfoides, Instituto de Medicina Experimental, CONICET-Academia Nacional de Medicina, Buenos Aires, Argentina
| | - Julieta Panero
- Laboratorio de Genética de Neoplasias Linfoides, Instituto de Medicina Experimental, CONICET-Academia Nacional de Medicina, Buenos Aires, Argentina
| | - Carmen Stanganelli
- División Patología Molecular, Instituto de Investigaciones Hematológicas-Academia Nacional de Medicina, Buenos Aires, Argentina
| | - Virginia Palau Nagore
- Laboratorio de Genética de Neoplasias Linfoides, Instituto de Medicina Experimental, CONICET-Academia Nacional de Medicina, Buenos Aires, Argentina
| | - Flavia Stella
- Laboratorio de Genética de Neoplasias Linfoides, Instituto de Medicina Experimental, CONICET-Academia Nacional de Medicina, Buenos Aires, Argentina
| | - Raimundo Bezares
- Servicio de Hematología, Hospital Teodoro Álvarez, Buenos Aires, Argentina
| | - Irma Slavutsky
- Laboratorio de Genética de Neoplasias Linfoides, Instituto de Medicina Experimental, CONICET-Academia Nacional de Medicina, Buenos Aires, Argentina
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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] [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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Telomere shortening associated with increased genomic complexity in chronic lymphocytic leukemia. Tumour Biol 2015; 36:8317-24. [DOI: 10.1007/s13277-015-3556-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Accepted: 05/11/2015] [Indexed: 01/08/2023] Open
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