Genetic analysis and assisted reproductive guidance for two infertile patients with rare small supernumerary marker chromosomes
10.3760/cma.j.cn511374-20230322-00152
- VernacularTitle:罕见超数小标记染色体2例患者的分子细胞遗传学分析和辅助生殖指导
- Author:
Duo YI
1
;
Shimin YUAN
;
Liang HU
;
Fei GONG
;
Keli LUO
;
Hao HU
;
Yueqiu TAN
;
Guangxiu LU
;
Ge LIN
;
Dehua CHENG
Author Information
1. 长沙中信湘雅生殖与遗传专科医院，长沙 410078
- Keywords:
Small supernumerary marker chromosome;
Fluorescence in situ hybridization;
Chromosomal microdissection;
High-throughput whole genome sequencin
- From:
Chinese Journal of Medical Genetics
2024;41(5):519-525
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To carry out cytogenetic and molecular genetic analysis for two infertile patients carrying rare small supernumerary marker chromosomes (sSMC).Methods:Two infertile patients who received reproductive and genetic counseling at CITIC Xiangya Reproductive and Genetic Hospital on October 31, 2018 and May 10, 2021, respectively were selected as the study subjects. The origin of sSMCs was determined by conventional G banding, fluorescence in situ hybridization (FISH) and copy number variation sequencing (CNV-seq). Microdissection combined with high-throughput whole genome sequencing (MicroSeq) was carried out to determine the fragment size and genomic information of their sSMCs. Results:For patient 1, G-banded karyotyping and FISH revealed that he has a karyotype of mos47, XY, del(16)(p10p12), + mar[65]/46, XY, del(16)(p10p12)[6]/48, XY, del(16)(p10p12), + 2mar[3].ish mar(Tel 16p-, Tel 16q-, CEP 16-, WCP 16+ ). CNV analysis has yielded a result of arr[GRCh37]16p12.1p11.2(24999364_33597595)×1[0.25]. MicroSeq revealed that his sSMC has contained the region of chromosome 16 between 24979733 and 34023115 (GRCh37). For patient 2, karyotyping and reverse FISH revealed that she has a karyotype of mos 47, XX, + mar[37]/46, XX[23].rev ish CEN5, and CNV analysis has yielded a result of seq[GRCh37]dup(5)(p12q11.2)chr5: g(45120001_56000000)dup[0.8]. MicroSeq results revealed that her sSMC has contained the region of chromosome 5 between 45132364 and 55967870(GRCh37). After genetic counseling, both couples had opted in vitro fertilization (IVF) treatment and preimplantation genetic testing (PGT). Conclusion:For individuals harboring sSMCs, it is vital to delineate the origin and structural characteristics of the sSMCs for their genetic counseling and reproductive guidance. Preimplantation genetic testing after microdissection combined with high-throughput whole genome sequencing (MicroSeq-PGT) can provide an alternative treatment for carrier couples with a high genetic risk.
