3. SELECTIVE TRANSFER OF EUPLOID NONCARRIER EMBRYOS WITH THE USE OF LONG-READ SEQUENCING IN PREIMPLANTATION GENETIC TESTING FOR RECIPROCAL TRANSLOCATION

2019 ◽  
Vol 39 ◽  
pp. e14-e15
Author(s):  
J.F.C. Chow ◽  
H.H.Y. Cheng ◽  
E.Y.L. Lau ◽  
W.S.B. Yeung ◽  
E.H.Y. Ng
Keyword(s):  
Genetic Testing ◽  
Reciprocal Translocation ◽  
Selective Transfer ◽  
Preimplantation Genetic Testing ◽  
Long Read

scholarly journals Successful Birth After Preimplantation Genetic Testing for a Couple With Two Different Reciprocal Translocations and Review of the Literature

2020 ◽  
Author(s):  
Dun Liu ◽  
Chuangqi Chen ◽  
Xiqian Zhang ◽  
Mei Dong ◽  
Tianwen He ◽  
...  
Keyword(s):  
Genetic Counseling ◽  
Genetic Testing ◽  
Reciprocal Translocation ◽  
Carrier Status ◽  
Review Of The Literature ◽  
Preimplantation Genetic Testing ◽  
Reciprocal Translocations ◽  
Translocation Breakpoints ◽  
Next Generation Sequencing Ngs ◽  
Low Coverage

Abstract Background: Preimplantation genetic testing for chromosomal structural rearrangements (PGT-SR) is widely applied in couples with single reciprocal translocation to increase the chance for a healthy live birth. However, limited knowledge is known on the data of PGT-SR when both parents have a reciprocal translocation. Here, we for the first time present a rare instance of PGT-SR for a non-consanguineous couple in which both parents carried an independent balanced reciprocal translocation and show how relevant genetic counseling data can be generated.Methods: The precise translocation breakpoints were identified by whole genome low-coverage sequencing (WGLCS) and Sanger sequencing. Next-generation sequencing (NGS) combining with breakpoint-specific polymerase chain reaction (PCR) was used to define 24-chromosome and the carrier status of the euploid embryos.Results: Surprisingly, 66.7% day-5 blastocysts were found to be balanced for maternal reciprocal translocation while being normal for paternal translocation and thus transferable. The transferable embryo rate was significantly higher than that which would be expected theoretically. Transfer of one balanced embryo resulted in the birth of a healthy boy. Conclusion(s): Our data of PGT-SR together with a systematic review of the literature should help in providing couples carrying two different reciprocal translocations undergoing PGT-SR with more appropriate genetic counseling.

scholarly journals Distinguishing between carrier and noncarrier embryos with the use of long-read sequencing in preimplantation genetic testing for reciprocal translocations

Genomics ◽  
2020 ◽  
Vol 112 (1) ◽  
pp. 494-500 ◽  
Author(s):  
Judy F.C. Chow ◽  
Heidi H.Y. Cheng ◽  
Estella Y.L. Lau ◽  
William S.B. Yeung ◽  
Ernest H.Y. Ng
Keyword(s):  
Genetic Testing ◽  
Preimplantation Genetic Testing ◽  
Reciprocal Translocations ◽  
Long Read

scholarly journals Effects of Gender of Reciprocal Chromosomal Translocation on Blastocyst Formation and Pregnancy Outcome in Preimplantation Genetic Testing

2021 ◽  
Vol 12 ◽  
Author(s):  
Hui Song ◽  
Hao Shi ◽  
En-tong Yang ◽  
Zhi-qin Bu ◽  
Zi-qi Jin ◽  
...  
Keyword(s):  
Genetic Testing ◽  
Pregnancy Outcome ◽  
Reciprocal Translocation ◽  
Maternal Age ◽  
Formation Rate ◽  
Chromosomal Translocation ◽  
Blastocyst Formation ◽  
Preimplantation Genetic Testing ◽  
Group A ◽  
Group B

ObjectiveTo determine the effect of gender of reciprocal chromosomal translocation on blastocyst formation and pregnancy outcome in preimplantation genetic testing, including different parental ages.MethodsThis was a retrospective cohort study that enrolled 1034 couples undergoing preimplantation genetic testing-structural rearrangement on account of a carrier of reciprocal chromosomal translocation from the Reproductive Medicine Center of the First Affiliated Hospital of Zhengzhou University from January 2015 to December 2019. Group A represented 528 couples in which the man was the carrier of reciprocal translocation and group B represented 506 couples in which the woman was the carrier of reciprocal translocation. All patients were divided into two groups according to their age: female age<35 and female age≥35. Furthermore, the differences in blastocyst condition and pregnancy outcome between male and female carriers in each group were further explored according to their father’s age.ResultsThe blastocyst formation rate of group A (55.3%) is higher than that of group B (50%) and the results were statistically significant (P<0.05). The blastocyst formation rate of group A is higher than that of group B, no matter in young maternal age or in advanced maternal age (P<0.05). The blastocyst formation rate in maternal age<35y and paternal age<30y in group A(57.1%) is higher than that of Group B(50%); Similarly, the blastocyst formation rate in maternal age≥35 and paternal age≥38y(66.7%) is higher than that of Group B(33.3%)(all P<0.05). There was no difference in fertilization rate, aeuploidy rate, clinical pregnancy rate, miscarriage rate and live birth rate between Group A and Group B.ConclusionWhen the carrier of reciprocal translocation is male, the blastocyst formation rate is higher than that of female carrier. While there is no significant difference between the two in terms of fertilization rate, aeuploidy rate, clinical pregnancy rate, miscarriage rate and live birth rate.

scholarly journals De novo balanced reciprocal translocation mosaic t(1;3)(q42;q25) detected by prenatal genetic diagnosis: a fetus conceived using preimplantation genetic testing due to a t(12;14)(q22;q13) balanced paternal reciprocal translocation

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Shaoqin Zhang ◽  
Jianjiang Zhu ◽  
Hong Qi ◽  
Limei Xu ◽  
Lirong Cai ◽  
...  
Keyword(s):  
Genetic Testing ◽  
Reciprocal Translocation ◽  
De Novo ◽  
Psychomotor Development ◽  
Chromosomal Microarray Analysis ◽  
Driving Mechanism ◽  
Balanced Translocation ◽  
Translocation Carrier ◽  
Preimplantation Genetic Testing ◽  
Reciprocal Translocations

Abstract Introduction De novo balanced reciprocal translocations mosaicism in fetus conceived using preimplantation genetic testing from a different balanced translocation carrier parent has been rarely reported. Methods Chromosomal microarray analysis, karyotype analysis and fluorescent in situ hybridization were performed to verify the type and heredity of the rearrangement. STR analysis was conducted to identify potential contamination and verify kinship. In addition, a local BLAST engine was performed to locate potentially homologous segments which might contribute to the translocation in breakpoints of chromosome. Results A rare de novo balanced reciprocal translocations mosaicism mos 46,XY,t(1;3)(q42;q25)[40]/46,XY[39] was diagnosed in a fetus conceived using preimplantation genetic testing due to a 46,XY,t(12;14)(q22;q13) balanced translocation carrier father through multiplatform genetic techniques. Two of the largest continuous high homology segments were identified in chromosomal band 1q42.12 and 3q25.2. At the 21-months follow up, infant has achieved all psychomotor development milestones as well as growth within the normal reference range. Conclusion We present a prenatal diagnosis of a rare de novo balanced reciprocal translocations mosaicism in a fetus who conceived by preimplantation genetic testing. The most reasonable driving mechanism was that a de novo mitotic error caused by nonallelic homologous recombination between 1q42.12 and 3q25.2 in a zygote within the first or early cell divisions, which results in a mosaic embryo with the variant present in a half proportion of cells.

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