Abstract:

Objective To confirm the potential etiological factors of congenital aortic stenosis （AS） by genetic analysis on prenatal diagnostic results of the fetus with AS. Methods Amniocentesis for chromosomal G-band karyotyping combinated with single nucleotide polymorphism array （SNP-array） analysis was conducted on the amniotic fluid collected from a 25-week pregnant woman diagnosed as “fetus AS”； chromosome karyotyping was also performed on the peripheral blood of the fetal parents. Results The fetal karyotype analysis showed a chimeric Y-chromosome isobaric double-adherent granules. The SNP-array analysis results revealed a 11.2 Mb duplication in the Yp11.31q11.21 region and a 14.8 Mb deletion in the Yq11.21q11.23 region. Both the parents presented a normal karyotype， suggesting it was a newfound mutation. After extensive genetic counseling， the pregnant woman and her family chose to terminate the pregnancy locally. Conclusion The chromosomal karyotype of the chimeric Y-chromosome isobaric double-adherent granules may be a contributing factor to the AS phenotype in the male fetus. The combined use of chromosomal karyotyping and SNP-array analysis on the amniotic cells is instrumental in the early diagnosis of the disease.

Key words: Fetus, Congenital heart disease, Aortic stenosis, Prenatal diagnosis, Chimeric Y-chromosome isobaric double-adherent granules