Application of chromosomal microarray analysis in 815 fetuses with increased nuchal translucency during early pregnancy.
10.3760/cma.j.issn.1003-9406.2020.08.007
- VernacularTitle:染色体微阵列分析在815例早孕期颈项透明层增厚胎儿中的应用
- Author:
Dan YANG
1
;
Xin YANG
;
Tingying LEI
;
Fang FU
;
Ru LI
;
Dongzhi LI
;
Can LIAO
Author Information
1. Institute of Birth Health and Perinatal Medicine, Guangzhou Women and Children's Medical Center Affiliated to Guangzhou Medical University, Guangzhou, Guangdong 510623, China. canliao6008@163.com.
- Publication Type:Journal Article
- From:
Chinese Journal of Medical Genetics
2020;37(8):833-838
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVE:To explore genetic etiology and prognosis for fetuses with increased nuchal translucency (NT).
METHODS:A total of 815 fetuses with increased NT (≥ 3.0 mm) were included. The fetuses were grouped by NT thickness and divided into 3.0-3.4 mm, 3.5-4.4 mm, 4.5-5.4 mm, 5.5- 6.4 mm and ≥ 6.5 mm groups. Based on the presence of additional abnormalities, the samples were divided into increased NT alone group and increased NT and other anomalies group. Chromosomal microarray analysis (CMA) was applied as a first-line test to detect pathogenic copy number variations (CNVs). The outcome of the pregnancies was followed up.
RESULTS:One hundred seventy-eight (21.8%) fetuses were found to harbor pathogenic CNVs, which included 138 (77.5%) with chromosomal aneuploidies, 14 (7.9%) with microdeletion/microduplication syndromes, and 26 (14.6%) harboring non-syndromic pathogenic CNVs. A significant difference was found in the detection rate of pathogenic CNVs between groups with different NT thickness. The detection rate of pathogenic CNVs also significantly differed between groups with regard to other structural abnormalities or the overall adverse pregnancy outcome.
CONCLUSION:CMA can be used as a first-line test for fetuses with increased NT during early pregnancy, with the overall detection rate of pathogenic CNVs being as high as 21.8%. Our results confirmed that NT thickness is correlated with other structural abnormalities and adverse pregnancy outcome, especially for those with NT ≥ 4.5 mm. At the same time, fetuses with other structural abnormalities are at an increased risk for adverse pregnancy outcome.
