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Peng Q, Yan Y, Yan H, Xie G, Shi L, Wen Y, Chang Q. Association between CYP19A1 rs6493497 and rs936306 polymorphisms and depression susceptibility in the Chinese population. Biomark Med 2022; 16:1171-1179. [PMID: 36628958 DOI: 10.2217/bmm-2022-0370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Aim: The CYP19A1 gene encodes the key aromatase for estrogen biosynthesis, and this study aimed to explore the relationship between CYP19A1 rs6493497 and rs936306 polymorphisms and depression risk. Methods: CYP19A1 rs6493497 and rs936306 genotyping was performed on 502 depression patients and 504 healthy controls. Results: In the general population, no significant association was observed between the CYP19A1 rs6493497 variant and depression, whereas that CYP19A1 rs936306 variant significantly reduced depression risk in the recessive model. In subgroup analysis, a significant association of the CYP19A1 rs6493497 variant with reduced depression risk was found in males aged 46-65 in the genotype, dominant and additive models. Conclusion: The CYP19A1 rs936306 variant may reduce depression risk, and the rs6493497 variant is associated with decreased depression risk in males aged 46-65.
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Affiliation(s)
- Qiuju Peng
- Department of Pharmacy, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
| | - Yuan Yan
- Department of Pharmacy, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
| | - Huacheng Yan
- Department of Infectious Disease Prevention & Control, Center for Disease Control & Prevention of Southern Theatre Command, Guangzhou, 510507, China
| | - Guibo Xie
- Department of Pharmacy, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
| | - Lei Shi
- Department of Pharmacy, General Hospital of Southern Theatre Command, Guangzhou, 510010, China
| | - Yuguan Wen
- Department of Pharmacy, Guangzhou Brain Hospital, Guangzhou, 510370, China
| | - Qingxian Chang
- Department of Gynecology & Obstetrics, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
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Al-Eitan LN, Rababa'h DM, Alghamdi MA, Khasawneh RH. Association of CYP gene polymorphisms with breast cancer risk and prognostic factors in the Jordanian population. BMC MEDICAL GENETICS 2019; 20:148. [PMID: 31477036 PMCID: PMC6720417 DOI: 10.1186/s12881-019-0884-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Accepted: 08/26/2019] [Indexed: 12/18/2022]
Abstract
Background Single nucleotide polymorphisms (SNPs) in several CYP genes have been associated with altered breast cancer (BC) risk in different populations. Despite this, there is a dearth of information on the roles of these SNPs in Jordanian BC patients. Therefore, this study aims to determine if there is any single nucleotide polymorphism (SNP) within CYP19A1, CYP2C19, CYP2C9, CYP1B1, CYP3A4, and CYP1A2 genes associated with BC in the Jordanian population. In addition, this work investigates the association between selected BC prognostic factors and variants of the aforementioned CYP candidate genes. Methods Blood samples were withdrawn from 221 BC patients and 218 healthy volunteers recruited from the Jordanian population. Genomic DNA was withdrawn and, after quantification and quality control, was genotyped using the Sequenom MassARRAY® system (iPLEX GOLD). Statistical analysis was then carried out to assess allelic and genotypic frequencies as well as genetic association between cases and controls. Results The CYP19A1 SNP rs7176005 (p < 0.0045) and the CYP1A2 SNP rs762551 (p = 0.004) were significantly associated with BC risk. However, no such association was found for the screened SNPs of the CYP2C9, CYP1B1, CYP2C19 and CYP3A4 genes. Regarding the prognostic factors of BC, several of the screened SNPs were associated with different pathological and clinical features. Conclusions Certain CYP genes, particularly CYP19A1 and CYP1A2, were associated with BC risk and development in the Jordanian population.
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Affiliation(s)
- Laith N Al-Eitan
- Department of Applied Biological Sciences, Jordan University of Science and Technology, Irbid, 22110, Jordan. .,Department of Biotechnology and Genetic Engineering, Jordan University of Science and Technology, P.O. Box 3030, Irbid, 22110, Jordan.
| | - Doaa M Rababa'h
- Department of Applied Biological Sciences, Jordan University of Science and Technology, Irbid, 22110, Jordan
| | | | - Rame H Khasawneh
- Department of Hematopathology, King Hussein Medical Center (KHMC), Jordan Royal Medical Services (RMS), Amman, 11118, Jordan
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Elevated Aromatase (CYP19A1) Expression Is Associated with a Poor Survival of Patients with Estrogen Receptor Positive Breast Cancer. Discov Oncol 2018; 9:128-138. [PMID: 29363090 PMCID: PMC5862917 DOI: 10.1007/s12672-017-0317-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Revised: 07/31/2017] [Accepted: 08/01/2017] [Indexed: 12/15/2022] Open
Abstract
Genetic variants in CYP19A1, the gene encoding aromatase, have been reported to be associated with circulating estrogen concentrations, a key risk factor for breast cancer. The mechanism underlying this association is still unclear; it has been suggested that some of these variants may alter the expression and/or activity of aromatase. Here we analyzed the expression of intra-tumoral CYP19A1 messenger RNA (mRNA) and the genotypes of rs10046, a well-characterized single nucleotide polymorphism in CYP19A1, in 138 breast cancer patients and 15 breast cancer cell lines. The genotype TT was detected in 36 patients and six cell lines, genotype CT in 55 patients and five cell lines, and genotype CC in 28 patients and four cell lines. We found no evidence for a significant association of CYP19A1 levels with rs10046 genotypes, although expression tended to be higher in tumors and cell lines with the homozygous risk genotype TT. We also found no evidence for a significant association of rs10046 genotypes with breast cancer prognosis. In contrast, high CYP19A1 expression was highly significantly associated with a poor overall, disease-free, and metastasis-free survival in estrogen receptor-positive but not negative breast cancer patients. Moreover, CYP19A1 mRNA was significantly elevated in postmenopausal patients and in patients older than 50 years, and a trend towards a positive correlation with ER status and ESR1 mRNA expression was observed. These findings highlight the key role of aromatase in estrogen receptor-positive breast cancer biology.
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Chu Q, Liang T, Zhou B. Genetic differences in oestrous signs and oestrogen metabolism-related genes between Chinese Mi and European Landrace-Large White pigs. Reprod Domest Anim 2017; 52:696-700. [PMID: 28370448 DOI: 10.1111/rda.12964] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2016] [Accepted: 02/16/2017] [Indexed: 01/26/2023]
Abstract
Oestrous signs affect timely mating and reproductive efficiency in swine breeding herds. To study the genetic difference of oestrous signs between Chinese and European pigs, 100 Landrace-Large White (LLW) cross gilts and 50 Chinese Mi gilts were assessed for oestrous signs and the concentrations of serum estradiol-17β and progesterone were determined. The genotype of 39 single nucleotide polymorphisms (SNPs) in 11 oestrogen metabolism and function-related genes was determined by Sequenom iPLEX platform. Compared with LLW gilts, Mi gilts had longer time of standing reflex (p < .001), higher scores of vulva reddening (p = .001) and greater serum estradiol-17β concentration (p < .01). Gilts with greater serum estradiol-17β concentrations also had greater (p < .05) scores for oestrous signs. Genetic polymorphisms of nine genes in oestrogen metabolism pathways had significant differences (p < .05) between LLW and Mi gilts. There were three and six haploblocks of SNPs in LLW and Mi, respectively. Compared with LLW, the distribution of haplotypes was more centralized in Mi pigs. Genetic polymorphisms of oestrogen metabolism-related genes have considerable differences between Chinese Mi and European LLW pigs. Because of the important roles of oestrogen during the oestrus, some genes of oestrogen metabolism pathway could be considered as candidate genes for oestrous signs.
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Affiliation(s)
- Q Chu
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, China
| | - T Liang
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, China
| | - B Zhou
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, China
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Morimoto M, Takahashi M, Honda J, Yoshida T, Yoshida M, Toba H, Imoto I, Tangoku A, Sasa M. Assay of serum E2 concentration in postmenopausal breast cancer patients using a high-sensitivity RIA method is generally useful. THE JOURNAL OF MEDICAL INVESTIGATION 2016; 63:236-40. [PMID: 27644565 DOI: 10.2152/jmi.63.236] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
BACKGROUND Serum E2 must be monitored for aromatase inhibitor (AI) therapy, but conventional assays lack sensitivity. SUBJECTS/METHODS Forty amenorrheic breast cancer patients scheduled for AI treatment but requiring hormonological confirmation of their menopausal status were studied. Serum E2 data generated by high-sensitivity RIA and by LC-MS/MS were analyzed for correlation. RESULTS RIA gave a higher E2 value than LC-MS/MS in 62% of cases, but there was a significant positive correlation. Patients whose E2 levels by RIA were ≥ 2.5 pg/mL higher than those by LC-MS/MS (RIA-H group) and all other patients (RIA-N group) were compared. Both groups showed strong correlations between the two assay methods. With both methods patients with a high BMI had significantly elevated E2. Multiple regression analysis used age, age at menarche, number of births and BMI as explanatory variables. Significant variables were the BMI with LC-MS/MS, and both BMI and age with RIA. The RIA-H and RIA-N groups showed no difference in regard to the BMI, whereas the age was significantly lower in the RIA-H group. SUMMARY Serum E2 levels determined for postmenopausal women by RIA and LC-MS/MS generally correlated well. High-sensitivity RIA is a potentially useful clinical assay, but it overestimated serum E2 in some women. J. Med. Invest. 63: 236-240, August, 2016.
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Affiliation(s)
- Masami Morimoto
- Department of Oncological and Regenerative Surgery, Institute of Health Biosciences, the University of Tokushima
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Kopp TI, Jensen DM, Ravn-Haren G, Cohen A, Sommer HM, Dragsted LO, Tjonneland A, Hougaard DM, Vogel U. Alcohol-related breast cancer in postmenopausal women - effect of CYP19A1, PPARG and PPARGC1A polymorphisms on female sex-hormone levels and interaction with alcohol consumption and NSAID usage in a nested case-control study and a randomised controlled trial. BMC Cancer 2016; 16:283. [PMID: 27102200 PMCID: PMC4839098 DOI: 10.1186/s12885-016-2317-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Accepted: 04/14/2016] [Indexed: 11/23/2022] Open
Abstract
Background Alcohol consumption is associated with increased risk of breast cancer (BC), and the underlying mechanism is thought to be sex-hormone driven. In vitro and observational studies suggest a mechanism involving peroxisome proliferator-activated receptor gamma (PPARγ) in a complex with peroxisome proliferator-activated receptor gamma coactivator 1-α (PGC-1α) and interaction with aromatase (encoded by CYP19A1). Use of non-steroidal anti-inflammatory drugs (NSAID) may also affect circulating sex-hormone levels by modifying PPARγ activity. Methods In the present study we assessed whether genetic variation in CYP19A1 is associated with risk of BC in a case-control study group nested within the Danish “Diet, Cancer and Health” cohort (ncases = 687 and ncontrols = 687) and searched for gene-gene interaction between CYP19A1 and PPARGC1A, and CYP19A1 and PPARG, and gene-alcohol and gene-NSAID interactions. Association between the CYP19A1 polymorphisms and hormone levels was also examined among 339 non-HRT users. Incidence rate ratios were calculated based on Cox’ proportional hazards model. Furthermore, we performed a pilot randomised controlled trial to determine the effect of the PPARG Pro12Ala polymorphism and the PPARγ stimulator Ibuprofen on sex-hormone levels following alcohol intake in postmenopausal women (n = 25) using linear regression. Results Genetic variations in CYP19A1 were associated with hormone levels (estrone: Prs11070844 = 0.009, estrone sulphate: Prs11070844 = 0.01, Prs749292 = 0.004, Prs1062033 = 0.007 and Prs10519297 = 0.03, and sex hormone-binding globulin (SHBG): Prs3751591 = 0.03) and interacted with alcohol intake in relation to hormone levels (estrone sulphate: Pinteraction/rs2008691 = 0.02 and Pinteraction/rs1062033= 0.03, and SHBG: Pinteraction/rs11070844 = 0.03). CYP19A1/rs3751591 was both associated with SHBG levels (P = 0.03) and with risk of BC (Incidence Rate Ratio = 2.12; 95 % Confidence Interval: 1.02–4.43) such that homozygous variant allele carriers had increased levels of serum SHBG and were at increased risk of BC. Acute intake of alcohol decreased blood estrone (P = <0.0001), estrone sulphate (P = <0.0001), and SHBG (P = 0.009) levels, whereas Ibuprofen intake and PPARG Pro12Ala genotype had no effect on hormone levels. Conclusions Our results suggest that genetically determined variation in CYP19A1 is associated with differences in sex hormone levels. However, the genetically determined differences in sex hormone levels were not convincingly associated with BC risk. The results therefore indicate that the genetically determined variation in CYP19A1 contributes little to BC risk and to alcohol-mediated BC risk. Trial registration NCT02463383, June 3, 2015. Electronic supplementary material The online version of this article (doi:10.1186/s12885-016-2317-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Tine Iskov Kopp
- Technical University of Denmark, National Food Institute, Søborg, Denmark. .,Danish Cancer Society Research Center, Copenhagen, Denmark. .,Research Centre for Prevention and Health, Rigshospitalet - Glostrup, Glostrup, Denmark.
| | - Ditte Marie Jensen
- Danish Cancer Society Research Center, Copenhagen, Denmark.,Section of Environmental Health, University of Copenhagen, Copenhagen, Denmark
| | - Gitte Ravn-Haren
- Technical University of Denmark, National Food Institute, Søborg, Denmark
| | - Arieh Cohen
- Department of Clinical Biochemistry and Immunology, Statens Serum Institute, Copenhagen, Denmark
| | | | - Lars Ove Dragsted
- Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | | | - David Michael Hougaard
- Department of Clinical Biochemistry and Immunology, Statens Serum Institute, Copenhagen, Denmark
| | - Ulla Vogel
- National Research Centre for the Working Environment, Copenhagen, Denmark
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Rui W, Sheng Y, Hu R, Miao Y, Han Y, Guo X, Qi S, Xu F, Xu J, Yang Q. Association of Single Nucleotide Polymorphisms in the CYP19A1 Gene with Female Pattern Hair Loss in a Chinese Population. Dermatology 2015; 231:239-44. [DOI: 10.1159/000433597] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2014] [Accepted: 05/26/2015] [Indexed: 11/19/2022] Open
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Umamaheswaran G, Kadambari D, Kumar ASA, Revathy M, Anjana R, Adithan C, Dkhar SA. Polymorphic genetic variations of cytochrome P450 19A1 and T-cell leukemia 1A genes in the Tamil population. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2015; 39:102-113. [PMID: 25481307 DOI: 10.1016/j.etap.2014.10.022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Revised: 10/23/2014] [Accepted: 10/27/2014] [Indexed: 06/04/2023]
Abstract
Aromatase inhibitors (AIs) are anti-neoplastic drugs widely used for the treatment of endocrine responsive breast carcinoma in postmenopausal women. Drug disposition, efficacy and tolerability of these agents are influenced by germ-line polymorphisms in the sequence of the genes encoding CYP19A1 and TCL1A proteins. In the current work, we aimed to determine the haplotype structures, linkage disequilibrium (LD) patterns, and allele and genotype frequency distribution of pharmacologically important variants from two genes (CYP19A1 and TCL1A) in Tamil population and assessed their ethnic differences. DNA derived from peripheral leukocytes of 111 healthy subjects were genotyped for 15 pharmacogenetic variants by real time thermocycler through allelic discrimination method using TaqMan 5' nuclease genotyping assay. The polymorphic variant allele frequencies of CYP19A1 were 42.3% (rs4646, T), 18% (rs10046, T), 36% (rs700519, T), 16.7% (rs700518, G), 26.1% (rs727479, G), 18% (rs4775936, T), 32% (rs10459592, G), 15.3% (rs1062033, C), 33.8% (rs749292, A), 40.1% (rs6493497, T) and 40.1% (rs7176005, G). TCL1A gene allele frequencies were 26.1% (rs7158782, G), 27% (rs7159713, G), 21.2% (rs2369049, G) and 27.5% (rs11849538, G). Comparing our data across the 5 HapMap populations (CEU, GIH, HCB, JPT and YRI) huge inter-ethnic differences were exhibited in the variant allele frequencies, LD patterns and haplotype blocks. Our results emphasize the importance of normative frequency documentation and will offer significant clinical relevance in personalizing AIs therapy.
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Affiliation(s)
- Gurusamy Umamaheswaran
- ICMR Centre for Advanced Research in Pharmacogenomics, Department of Pharmacology, Jawaharlal Institute of Postgraduate Medical Education & Research (JIPMER), Pondicherry 605006, India.
| | - Dharanipragada Kadambari
- Department of Surgery, Jawaharlal Institute of Postgraduate Medical Education & Research (JIPMER), Pondicherry 605006, India
| | - Annan Sudarsan Arun Kumar
- ICMR Centre for Advanced Research in Pharmacogenomics, Department of Pharmacology, Jawaharlal Institute of Postgraduate Medical Education & Research (JIPMER), Pondicherry 605006, India
| | - Mohan Revathy
- Department of Biotechnology and Biochemical Engineering, Sree Buddha College of Engineering, Alappuzha 690529, Kerala, India
| | - Raj Anjana
- Department of Biotechnology and Biochemical Engineering, Sree Buddha College of Engineering, Alappuzha 690529, Kerala, India
| | - Chandrasekaran Adithan
- ICMR Centre for Advanced Research in Pharmacogenomics, Department of Pharmacology, Jawaharlal Institute of Postgraduate Medical Education & Research (JIPMER), Pondicherry 605006, India
| | - Steven Aibor Dkhar
- ICMR Centre for Advanced Research in Pharmacogenomics, Department of Pharmacology, Jawaharlal Institute of Postgraduate Medical Education & Research (JIPMER), Pondicherry 605006, India
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Fontein DBY, Houtsma D, Nortier JWR, Baak-Pablo RF, Kranenbarg EMK, van der Straaten TRJHM, Putter H, Seynaeve C, Gelderblom H, van de Velde CJH, Guchelaar HJ. Germline variants in the CYP19A1 gene are related to specific adverse events in aromatase inhibitor users: a substudy of Dutch patients in the TEAM trial. Breast Cancer Res Treat 2014; 144:599-606. [PMID: 24590773 DOI: 10.1007/s10549-014-2873-2] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2013] [Accepted: 02/07/2014] [Indexed: 10/25/2022]
Abstract
Musculoskeletal adverse events (MSAEs) and vasomotor symptoms (VMSs) are known side-effects of aromatase inhibitors, and may be related to genetic variations of the aromatase gene (CYP19A1). We investigated the relationship between these specific AEs and single nucleotide polymorphisms (SNPs) in the CYP19A1 gene in postmenopausal, hormone receptor-positive early breast cancer (BC) patients treated with adjuvant exemestane for 5 years. Dutch patients who were randomized to receive 5 years of exemestane in the Tamoxifen Exemestane Adjuvant Multinational (TEAM) trial were included. A tagging-SNP approach was performed, covering 80 % of variations of the CYP19A1 gene with 30 SNPs. Logistic regression analyses were used to assess the risk of reporting VMSs or MSAEs in relation to genotypes within selected SNPs. Of 737 included patients, 281 patients reported at least one MSAE (n = 210) or VMS (n = 163). Homozygous AA genotype of rs934635 was associated with a significantly higher odds of MSAEs (multivariate odds ratio (OR) 4.66, p = 0.008) and VMSs (multivariate OR 2.78, p = 0.044). Regarding both rs1694189 and rs7176005, the homozygous variant genotypes (TT) were associated with a higher odds of VMSs, but not MSAEs (OR 1.758, p = 0.025 and OR 6.361, p = 0.021, respectively). Our exploratory analysis demonstrated that some CYP19A1 gene variations may be associated with MSAEs and/or VMSs. Specifically, patients with the homozygous variant rs934635 genotype reported more MSAEs and VMSs. Although further confirmatory studies are warranted, genomic profiling can help identify patients at an increased risk of reporting these specific AEs, potentiating further personalized BC treatment.
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Affiliation(s)
- Duveken B Y Fontein
- Department of Surgery, Leiden University Medical Center, Leiden, The Netherlands
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Umamaheswaran G, Dkhar SA, Kalaivani S, Anjana R, Revathy M, Jaharamma M, Shree KML, Kadambari D, Adithan C. Haplotype structures and functional polymorphic variants of the drug target enzyme aromatase (CYP19A1) in South Indian population. Med Oncol 2013; 30:665. [PMID: 23893151 DOI: 10.1007/s12032-013-0665-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2013] [Accepted: 07/12/2013] [Indexed: 10/26/2022]
Abstract
CYP19A1 gene product aromatase (CYP19A1) is a 58-kDa protein and belongs to the member of the cytochrome P450 superfamily, which facilitates the bioconversion of estrogens from androgens. Single-nucleotide polymorphisms (SNPs) of CYP19A1 affect the activity of the enzyme and have been implicated in the association of estrogen-dependent disease, prognosis, therapeutic efficacy, and toxicity of third-generation aromatase inhibitors (AIs). Based on ethnicity, the frequency distribution of CYP19A1 alleles will differ, and until now, no data are available for Indians. Using qRT-PCR with TaqMan assays, the frequencies of functionally important polymorphic variants of CYP19A1 gene were determined in 163 healthy subjects of South Indian origin. The observed frequencies of the CYP19A1 minor alleles for the SNPs rs4646 (T), rs10046 (T), rs700519 (T), rs700518 (G), rs727479 (G), rs4775936 (T), rs10459592 (G), rs749292 (A), rs6493497 (T), and rs7176005 (A) are 41.1 (35.8-46.4), 20.0 (15.6-24.3), 33.7 (28.6-38.9), 17.8 (13.6-21.9), 25.8 (21.0-30.5), 19.9 (15.6-24.3), 33.7 (28.6-38.9), 24.9 (20.2-29.5), 35.9 (30.7-41.1), and 35.9 (30.7-41.1), respectively. Strong linkage disequilibrium existed between CYP19A1 SNPs, and sixteen different haplotype structures with a frequency >1% were derived from all the 10 SNPs tested. The most common being the haplotype (H1) GCTATCTGTG with a frequency of about 17.8%. Gender-specific assessment showed significant difference in the allele frequency for rs749292 (p < 0.04), and greater inter-ethnic variation was detected in the distribution of CYP19A1 variants except for rs727479. Our results could provide preliminary insight for further pharmacogenetic investigations of AIs as well as for subsequent molecular epidemiological studies on the contribution of these variants to the occurrence and development of estrogen-dependent disease in South Indians.
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Affiliation(s)
- Gurusamy Umamaheswaran
- ICMR Centre for Advanced Research in Pharmacogenomics, Department of Pharmacology, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Pondicherry 605006, India.
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11
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Abstract
Aromatase inhibitors (AIs) are an important class of endocrine drugs used in the treatment of early and advanced breast cancer in postmenopausal women. A number of studies have taken candidate approaches to assess the role of variants in genes encoding enzymes important in AI metabolism, notably CYP19A1 (aromatase), in AI response. These studies have shown conflicting, but interesting, results suggesting that CYP19A1 variants may be important in both the efficacy and toxicity of AIs. A recent genome-wide association study has identified a variant, creating an estrogen response element in TCL1A, which is associated with an increased risk of the musculoskeletal side effects associated with AI use. As breast cancer incidence increases, predictive biomarkers of response to AIs will become more important to ensure the most effective use of endocrine treatments.
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Affiliation(s)
- Kristen D Hadfield
- Genetic Medicine, Manchester Academic Health Sciences Centre (MAHSC), University of Manchester & Central Manchester University Hospitals NHS Foundation Trust, M13 9WL, UK
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