Prenatal cytogenetic and molecular genetic analysis of a fetus with confined placenta mosaicism for trisomy 16.
10.3760/cma.j.cn511374-20200609-00425
- Author:
Zhihui JIAO
1
;
Chaofeng ZHU
;
Yaqin HOU
;
Li WANG
;
Xiangdong KONG
Author Information
1. Genetics and Prenatal Diagnosis Center, Department of Obstetrics and Gynecology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, China. kongxd@263.net.
- Publication Type:Journal Article
- MeSH:
Amniocentesis;
Chromosomes, Human, Pair 16/genetics*;
Cytogenetic Analysis;
Female;
Fetus;
Humans;
In Situ Hybridization, Fluorescence;
Molecular Biology;
Mosaicism;
Placenta;
Pregnancy;
Prenatal Diagnosis;
Trisomy/genetics*
- From:
Chinese Journal of Medical Genetics
2021;38(8):771-774
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVE:To review the clinical data of a fetus with false positive result of non-invasive prenatal testing (NIPT) due to confined placental mosaicism (CPM).
METHODS:Amniotic fluid sample was taken from a pregnant women with high risk for chromosome 16 aneuploidy for karyotyping analysis, single nucleotide polymorphism array (SNP array) and interphase fluorescence in situ hybridization (FISH). Genetic testing was also conducted on the fetal and maternal surface of the placenta, root of umbilical cord and fetal skin tissue after induced abortion.
RESULTS:Cytogenetic analysis of the amniotic fluid sample yielded a normal karyotype. SNP array revealed mosaicism (20%) of trisomy 16 in the fetus. FISH confirmed the presence of mosaicism (25%) for trisomy 16. After induced labor, all sampled sites of placenta were confirmed to contain trisomy 16 by SNP array, while the analysis of fetal skin tissue yielded a negative result.
CONCLUSION:CPM is an important factor for false positive NIPT result. Prenatal identification of CPM and strengthened pregnancy management are important to reduce adverse pregnancy outcomes.
