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Wan J, Li R, Li F, Yu Q, Wang D, Sun X, Zhang Y, Jing X, Tang X, Chen G, Jiang F, Li F, Fu F, Li Y, Zhang L, Yi C, Li J, Li D, Liao C. Contribution of maternal mosaicism to false-positive chromosome X loss associated with noninvasive prenatal testing. J Matern Fetal Neonatal Med 2022; 35:9647-9653. [PMID: 35282756 DOI: 10.1080/14767058.2022.2050362] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
OBJECTIVE To report the frequency of maternal mosaicism contributing to false-positive chromosome X loss associated with noninvasive prenatal testing (NIPT) at a single center. METHODS Pregnancies undergone NIPT using massively parallel sequencing at Guangzhou Women and Children's Medical Center between February 2015 and May 2020 were included in this study. Fetal karyotyping, quantitative fluorescence PCR (QF-PCR) or microarray analysis was provided to patients with abnormal sex chromosomal aneuploidy (SCA) results for confirmatory testing, and QF-PCR was also employed to detect maternal sex chromosome status. RESULTS cffDNA testing of 40682 pregnancies revealed 86 cases with NIPT results positive for chromosome X loss (0.21%). Among the 86 high-risk cases, 73 women had undergone confirmatory testing in our center, whereas 13 declined. Of the 73 women verified by invasive prenatal diagnosis, 27.4% (20/73) were true positive cases including six cases of monosomy X, two cases of microdeletion of Xp22.33, one case of deletion Xq27.2q28, one case of 47, XXX and ten cases with fetal sex chromosome mosaicism. Of the remaining 53 patients with fetal normal results, 30 cases had undergone QF-PCR analysis of maternal white blood cells. QF-PCR indicated that 36.7% (11/30) patients had an altered or mosaic maternal sex chromosome status. Statistical analysis indicated that cell-free fetal DNA (cffDNA) concentration estimated by chromosome X in maternal mosaic cases was significantly higher than that in the non-maternal mosaicism group (p < .05) and was related to maternal mosaicism rate (r = 0.88, p < .05). CONCLUSIONS Our findings indicated that maternal mosaicism of sex chromosome was not uncommon in false-positive NIPT chromosome X loss cases. We recommend that this information should be disclosed to pregnancies during clinical counseling and maternal sex chromosome status should be confirmed for the cases with NIPT chromosome X loss.
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Affiliation(s)
- Junhui Wan
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Centre, Guangzhou Medical University, Guangzhou, P.R. China
| | - Ru Li
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Centre, Guangzhou Medical University, Guangzhou, P.R. China
| | - Fatao Li
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Centre, Guangzhou Medical University, Guangzhou, P.R. China
| | - Qiuxia Yu
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Centre, Guangzhou Medical University, Guangzhou, P.R. China
| | - Dan Wang
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Centre, Guangzhou Medical University, Guangzhou, P.R. China
| | - Xiuhong Sun
- Department of Ultrasound, Guangzhou Women and Children's Medical Centre, Guangzhou Medical University, Guangzhou, P.R. China
| | - Yongling Zhang
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Centre, Guangzhou Medical University, Guangzhou, P.R. China
| | - Xiangyi Jing
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Centre, Guangzhou Medical University, Guangzhou, P.R. China
| | - Xuewei Tang
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Centre, Guangzhou Medical University, Guangzhou, P.R. China
| | - Guilan Chen
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Centre, Guangzhou Medical University, Guangzhou, P.R. China
| | - Fan Jiang
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Centre, Guangzhou Medical University, Guangzhou, P.R. China
| | - Fucheng Li
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Centre, Guangzhou Medical University, Guangzhou, P.R. China
| | - Fang Fu
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Centre, Guangzhou Medical University, Guangzhou, P.R. China
| | - Yan Li
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Centre, Guangzhou Medical University, Guangzhou, P.R. China
| | - Lina Zhang
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Centre, Guangzhou Medical University, Guangzhou, P.R. China
| | - Cuixing Yi
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Centre, Guangzhou Medical University, Guangzhou, P.R. China
| | - Jian Li
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Centre, Guangzhou Medical University, Guangzhou, P.R. China
| | - Dongzhi Li
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Centre, Guangzhou Medical University, Guangzhou, P.R. China
| | - Can Liao
- Department of Prenatal Diagnostic Center, Guangzhou Women and Children's Medical Centre, Guangzhou Medical University, Guangzhou, P.R. China
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Evaluation of interpretation methods to improve accuracy of the prenatal BACs-on-Beads™ assay in prenatal diagnosis. Exp Ther Med 2020; 21:121. [PMID: 33335584 PMCID: PMC7739854 DOI: 10.3892/etm.2020.9553] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Accepted: 10/30/2020] [Indexed: 11/27/2022] Open
Abstract
Prenatal BACs-on-Beads™ (PNBoBs™) technology has been approved for use in routine clinical prenatal diagnosis in numerous countries. However, the influence of data interpretation on the accuracy of the results remains to be evaluated. The present study aimed to determine the accuracy of existing data interpretation approaches and develop an optimization method to improve the performance of the PNBoBs™ assay in prenatal diagnosis. A total of 2,289 prenatal cases with known karyotypes and raw ratio data from PNBoBs™ assays were recruited for the present study. Positive results, according to the data interpretation methods used for the PNBoBs™ test, were validated against current gold-standard approaches. Statistical analyses were then performed to evaluate the accuracy of existing methods in data interpretation to provide a basis for the optimization of a follow-up approach. Among the existing methods, the ‘trimmed standard deviation threshold’ approach had the highest sensitivity and false-positive rates, with 98.1 and 4.2%, respectively. The ‘n-1 or greater probes’ rule had the highest specificity (99.7%) and the second-highest false-negative rate (11.5%). The method optimized in the present study provided a reasonable balance between sensitivity (98.1%) and specificity (99.6%) with regards to the interpretation of the data obtained from the PNBoBs™ assay. The results indicated that the present optimization method outperforms existing approaches in data interpretation for the PNBoBs™ assay, and as a result, may reduce unnecessary verification turnaround time and cost in prenatal diagnosis.
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Li DZ, Yang YD. Invasive prenatal diagnosis of fetal thalassemia. Best Pract Res Clin Obstet Gynaecol 2016; 39:41-52. [PMID: 27889305 DOI: 10.1016/j.bpobgyn.2016.10.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Revised: 09/22/2016] [Accepted: 10/14/2016] [Indexed: 01/30/2023]
Abstract
Thalassemia is the most common monogenic inherited disease worldwide, affecting individuals originating from many countries to various extents. As the disease requires long-term care, prevention of the homozygous state presents a substantial global disease burden. The comprehensively preventive programs involve carrier detections, molecular diagnostics, genetic counseling, and prenatal diagnosis. Invasive prenatal diagnosis refers to obtaining fetal material by chorionic villus sampling (CVS) at the first trimester, and by amniocentesis or cordocentesis at the second trimester. Molecular diagnosis, which includes multiple techniques that are aimed at the detection of mutations in the α- or β-globin genes, facilitates prenatal diagnosis and definitive diagnosis of the fetus. These are valuable procedures for couples at risk, so that they can be offered options to have healthy offspring. According to local practices and legislation, genetic counseling should accompany the invasive diagnostic procedures, DNA testing, and disclosure of the results. The most critical issue in any type of prenatal molecular testing is maternal cell contamination (MCC), especially when a fetus is found to inherit a particular mutation from the mother. The best practice is to perform MCC studies on all prenatal samples. The recent successful studies of fetal DNA in maternal plasma may allow future prenatal testing that is non-invasive for the fetus and result in significant reduction of invasive diagnostic procedures.
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Affiliation(s)
- Dong-Zhi Li
- Prenatal Diagnostic Center, Guangzhou Women and Children Medical Center Affiliated to Guangzhou Medical University, Guangzhou, Guangdong, China.
| | - Yan-Dong Yang
- Fetal Medicine Division, Guangzhou Overseas Chinese Hospital, First Affiliated Hospital of Jinan University, Guangzhou, Guangdong, China.
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Kamath MS, Pradhan S, Edison ES, Velayudhan SR, Antonisamy B, Karthikeyan M, Mangalaraj AM, Kunjummen A, George K. Chorionic villous sampling through transvaginal ultrasound approach: A retrospective analysis of 1138 cases. J Obstet Gynaecol Res 2016; 42:1229-1235. [PMID: 27352773 DOI: 10.1111/jog.13070] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2016] [Revised: 03/29/2016] [Accepted: 05/02/2016] [Indexed: 11/27/2022]
Abstract
AIM The aim of this study was to evaluate the effectiveness and safety of a transvaginal approach for chorionic villous sampling (CVS). METHODS We carried out a retrospective data analysis of all the transvaginal CVS procedures performed for the purpose of prenatal diagnosis in a university-level referral center between January 2000 and December 2014. Women underwent the prenatal testing between 10 and 17 weeks of gestation mainly for hematological disorders involving single gene defects. The main outcomes were successful sampling rate, maternal contamination rate, post-procedure complications rates, and immediate fetal loss rate (<14 days post-procedure). RESULTS A total of 1138 transvaginal CVS were performed during the study period and were available for analysis. The sampling success rate after the first attempt was 98.5% (1121/1138) and the overall success rate was 99.6% (1133/1138). The maternal contamination rate was 0.4% (5/1138). While two patients had vaginal bleeding (0.2%), fresh retroplacental collection was noted in four patients (0.4%) post-procedure. None of the patients developed ascending uterine infection following CVS. The immediate fetal loss rate was 0.2% (2/1138). CONCLUSION Transvaginal approach is associated with high sampling success, along with low rates of maternal contamination and post-procedure complications; hence, it can be offered as an effective alternative method of CVS.
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Affiliation(s)
- Mohan S Kamath
- Reproductive Medicine Unit, Christian Medical College, Vellore, India
| | - Sujata Pradhan
- Reproductive Medicine Unit, Christian Medical College, Vellore, India
| | | | | | | | | | - Ann M Mangalaraj
- Reproductive Medicine Unit, Christian Medical College, Vellore, India
| | | | - Korula George
- Reproductive Medicine Unit, Bangalore Baptist Hospital, Bangalore, India.
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Li DZ, Pan M, Han J, Yang X, Zhen L, Li J, Ou YM. Prenatal diagnosis of thalassemia in twin pregnancies in mainland China. J OBSTET GYNAECOL 2016; 36:731-734. [PMID: 27018613 DOI: 10.3109/01443615.2016.1148678] [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: 11/13/2022]
Abstract
The aim of this study was to describe our experience with prenatal diagnosis of thalassemia in twin pregnancies at a tertiary referral centre in mainland China. All cases of twin pregnancies at risk of α- or β-thalassemias were followed over an eight-year period. There were 32 twin pregnancies at a mean gestation of 14 weeks (range, 11-21 weeks) at risk of thalassemias, including 19 at risk of α-thalassemia and 13 at risk of β-thalassemia. Chorionicity was determined by ultrasound before prenatal diagnosis. In 19 twin pregnancies at risk of α-thalassemia, there were four where both foetuses were affected, 13 where both foetuses were not affected, and two where one foetus was affected and the other one was not affected. In 13 twin pregnancies at risk of β-thalassemia, there were five where both foetuses were affected, six where both foetuses were not affected, and two where one foetus was affected and the other one was not affected. The pregnancies with two affected foetuses were aborted (including four affected by α-thalassemia and five affected by β-thalassemia), and in pregnancies with one normal twin and one affected twin, the affected foetuses were selectively aborted (including two twins affected by α-thalassemia, and two twins affected by β-thalassemia). Efforts should be taken to reduce the risks of the mother and foetuses in prenatal diagnosis without compromising the precise diagnosis.
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Affiliation(s)
- Dong-Zhi Li
- a Prenatal Diagnostic Center, Guangzhou Women and Children Medical Center Affiliated to Guangzhou Medical University , Guangzhou , Guangdong , China
| | - Min Pan
- a Prenatal Diagnostic Center, Guangzhou Women and Children Medical Center Affiliated to Guangzhou Medical University , Guangzhou , Guangdong , China
| | - Jin Han
- a Prenatal Diagnostic Center, Guangzhou Women and Children Medical Center Affiliated to Guangzhou Medical University , Guangzhou , Guangdong , China
| | - Xin Yang
- a Prenatal Diagnostic Center, Guangzhou Women and Children Medical Center Affiliated to Guangzhou Medical University , Guangzhou , Guangdong , China
| | - Li Zhen
- a Prenatal Diagnostic Center, Guangzhou Women and Children Medical Center Affiliated to Guangzhou Medical University , Guangzhou , Guangdong , China
| | - Jian Li
- a Prenatal Diagnostic Center, Guangzhou Women and Children Medical Center Affiliated to Guangzhou Medical University , Guangzhou , Guangdong , China
| | - Yan-Mei Ou
- a Prenatal Diagnostic Center, Guangzhou Women and Children Medical Center Affiliated to Guangzhou Medical University , Guangzhou , Guangdong , China
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Zhen L, Pan M, Han J, Yang X, Liao C, Li DZ. First-trimester combined screening for trisomy 21 in women at risk for α-thalassemia. J Matern Fetal Neonatal Med 2015; 29:1949-51. [PMID: 26169708 DOI: 10.3109/14767058.2015.1069812] [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: 11/13/2022]
Abstract
OBJECTIVE To report the strategy of first-trimester aneuploidy screening in pregnancies at risk for homozygous α(0)-thalassemian. METHODS Women at risk of homozygous α(0)-thalassemia were given an ultrasound examination at 11-14 weeks' gestation to exclude an affected pregnancy. Fetal cardiothoracic ratio (CTR) and nuchal translucence (NT) were measured. If cardiomegaly was found, chorionic villus sampling (CVS) was offered for α-thalassemia; otherwise the first-trimester combined screening test was performed on the pregnancy. The invasive testing for karyotyping was only followed in those cases with a positive aneuploidy screening test. RESULTS In total, 69 of 288 pregnancies were found to be affected by homozygous α(0)-thalassemia using ultrasound, and the findings were confirmed by invasive testing. In the remaining 219 pregnancies, invasive testing was not performed for α-thalassemia because of a normal fetal CTR, and the women received the first-trimester combined screening. Nine CVS procedures were performed for karyotyping because of a positive aneuploidy screening. Totally three pregnancies with aneuploidy were diagnosed and terminated. CONCLUSIONS Our strategy can selectively detect aneuploidy pregnancies not affected by homozygous α-thalassemia, and, meanwhile, save on the cost of unnecessary aneuploidy screening or karyotyping in pregnancies with an affected fetus of homozygous α(0)-thalassemia.
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Affiliation(s)
- Li Zhen
- a Prenatal Diagnostic Center, Guangzhou Women and Children Medical Center Affiliated to Guangzhou Medical University , Guangzhou , Guangdong , China
| | - Min Pan
- a Prenatal Diagnostic Center, Guangzhou Women and Children Medical Center Affiliated to Guangzhou Medical University , Guangzhou , Guangdong , China
| | - Jin Han
- a Prenatal Diagnostic Center, Guangzhou Women and Children Medical Center Affiliated to Guangzhou Medical University , Guangzhou , Guangdong , China
| | - Xin Yang
- a Prenatal Diagnostic Center, Guangzhou Women and Children Medical Center Affiliated to Guangzhou Medical University , Guangzhou , Guangdong , China
| | - Can Liao
- a Prenatal Diagnostic Center, Guangzhou Women and Children Medical Center Affiliated to Guangzhou Medical University , Guangzhou , Guangdong , China
| | - Dong-Zhi Li
- a Prenatal Diagnostic Center, Guangzhou Women and Children Medical Center Affiliated to Guangzhou Medical University , Guangzhou , Guangdong , China
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Li J, Li R, Li DZ. Identification of nondeletional α-thalassemia in a prenatal screening program by reverse dot-blot in southern China. Hemoglobin 2014; 39:42-5. [PMID: 25523870 DOI: 10.3109/03630269.2014.985832] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The aim of this study was to demonstrate the performance of nondeletional α-thalassemia (α-thal) prevention using a reverse dot-blot method at a Mainland Chinese hospital. A prenatal control program for nondeletional Hb H disease was performed between January 2009 and December 2013. All couples were screened for α-thal trait, and for couples in which one partner tested positive for α(0)-thal, the other was subjected to screening for Hb Constant Spring (Hb CS, HBA2: c.427T > C) and Hb Quong Sze (Hb QS, HBA2: c.377T > C) mutations by reverse dot-blot assay. Prenatal diagnoses were offered in at-risk pregnancies. During the study period, 51,105 couples were found to be carrying α-thal; among these, 35 (0.07%) couples were found to be at-risk of conceiving an offspring with nondeletional Hb H disease, including 25 couples for Hb H-CS and 10 cases for Hb H-QS. Nine fetuses were diagnosed with nondeletional Hb H disease, and eight of the affected pregnancies were terminated. Detection of nondeletional α-thal is necessary for any prenatal diagnosis (PND) programs in Southeast Asian countries. Reverse dot-blot is a relatively simple method for simultaneous typing of common nondeletional α-thal mutations.
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Affiliation(s)
- Jian Li
- Prenatal Diagnostic Center, Guangzhou Women & Children's Medical Center, Guangzhou Medical University , Guangzhou, Guangdong , People's Republic of China
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Liao C, Li DZ. Should sex chromosomes be excluded from use in QF-PCR in prenatal samples with a molecular referral? Am J Med Genet A 2014; 164A:2404-6. [PMID: 24942254 DOI: 10.1002/ajmg.a.36637] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2013] [Accepted: 05/07/2014] [Indexed: 11/06/2022]
Affiliation(s)
- Can Liao
- Prenatal Diagnostic Center, Guangzhou Maternal & Neonatal Hospital, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, China
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Liao C, Li DZ. Acceptability of supplementary QF-PCR among women undergoing prenatal diagnosis in mainland China. Prenat Diagn 2012; 32:813-4. [PMID: 22570285 DOI: 10.1002/pd.3897] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Can Liao
- Prenatal Diagnostic Center, Guangzhou Maternal & Neonatal Hospital, Guangzhou Women and Children's Medical Center, Guangzhou Medical College, Guangzhou, Guangdong, China
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Liao YM, Lin SK, Liu TC, Chiou SS, Lu HC, Kao CF, Chang JG. Rapid identification of the copy number of α-globin genes by capillary electrophoresis analysis. Clin Biochem 2012; 45:798-805. [PMID: 22374170 DOI: 10.1016/j.clinbiochem.2012.02.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2011] [Revised: 01/19/2012] [Accepted: 02/09/2012] [Indexed: 10/28/2022]
Abstract
OBJECTIVES The current study aimed at the rapid identification of the copy number of α-globin genes for the diagnosis of α-thalassemia. DESIGN AND METHODS To identify the copy number of α-globin genes in α-thalassemia, we developed a novel method using a multiplex polymerase chain reaction (PCR) in combination with the CE analysis. RESULTS The proposed method provides a rapid detection of the common α-globin gene deletions. Sixty-six patients with α-thalassemia and 46 normal controls were included in the present study. The obtained results showed good correlation with those obtained by gap PCR. Moreover, a low amount of maternal cell contamination in the fetus specimen for the prenatal diagnosis of hemoglobin Barts hydrops fetalis as well as the rare multiplicated α-globin genes can be identified using this method. CONCLUSION This method provides a convenient and efficient tool for the rapid identification of the copy number of α-globin genes in α-thalassemia and the individuals with α-globin gene multiplication.
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Affiliation(s)
- Yu-Mei Liao
- Department of Pediatrics, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
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[Chromosomal abnormality diagnosis of male infertility by QF-PCR]. YI CHUAN = HEREDITAS 2011; 33:895-900. [PMID: 21831806 DOI: 10.3724/sp.j.1005.2011.00895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
To assess the clinical practice of quantitative fluorescence PCR (QF-PCR) in genetic diagnosis of male infertility patients, 78 nonobstructive male infertility patients were pooled for semen routine screening and sexual hormone determination; QF-PCR was applied to detect the polymorphic short tandem repeat (STR) and specific sequence tagged site (STS) of sex chromosomes; routine chromosome G-band was used for karyotype analysis and PCR was used for the detection of AZF microdeletion. Routine screening of semen found 18 azoospermia and 20 oligospermia patients (48.72%). Three patients with 47, XXY, two with 46,XX(SRY+)and one with AZFc microdeletion were detected using QF-PCR technique which were verified by chromosome G-band and PCR. This study suggests that QF-PCR is a comprehensive, rapid and reliable method for detecting abnormal chromosomal regions and microstructures compared with traditional tests and provides a better candidate for diagnosis of male infertility caused by chromosomal anomalies and gene mutation.
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Prospective validation of quantitative fluorescent polymerase chain reaction for rapid detection of common aneuploidies. Genet Med 2011; 13:140-7. [DOI: 10.1097/gim.0b013e3182036763] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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Abstract
To choose the most appropriate treatment for children affected by a transplacental metastasis, it is crucial to ascertain the maternal origin of the tumor. Up-to-date conclusive diagnosis is generally achieved through fluorescence in situ hybridization or karyotyping analysis. Herein, we report an alternative, reliable assay for rapidly defining vertical cancer transmission to the fetus by using quantitative polymerase chain reaction. Our assay indicates that quantification of the copy number of the sex chromosomes by specific short tandem repeats markers, in genomic DNA purified from the tumor biopsy cells, could be used to correctly evaluate transplacental metastasis events.
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