Prenatal genetic analysis of three fetuses with abnormalities of chromosome 22.
10.3760/cma.j.issn.1003-9406.2020.04.010
- Author:
Yunsheng GE
1
;
Jian ZHANG
;
Meijiao CAI
;
Xiaolu CHEN
;
Yulin ZHOU
Author Information
1. Prenatal Diagnosis Center, Women and Children's Hospital, School of Medicine, Xiamen University, Fujian 361003, China. zhou_yulin@126.com.
- Publication Type:Case Reports
- MeSH:
Chromosome Aberrations;
Chromosome Deletion;
Chromosome Disorders;
diagnosis;
genetics;
Chromosomes, Human, Pair 22;
genetics;
Female;
Fetus;
Genetic Testing;
Humans;
In Situ Hybridization, Fluorescence;
Karyotyping;
Pregnancy;
Prenatal Diagnosis;
Transcription Factors;
Ultrasonography, Prenatal
- From:
Chinese Journal of Medical Genetics
2020;37(4):405-409
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVE:To carry out genetic testing for 3 fetuses with abnormal prenatal screening.
METHODS:Fetal ultrasound, karyotype analysis, single nucleotide polymorphism (SNP) array and fluorescence in situ hybridization were performed.
RESULTS:Abnormalities of chromosome 22 were found with all 3 fetuses. Fetus 1 harbored a 7.1 Mb deletion in 22q13.2q13.33 region, which involved 54 OMIM genes including SHANK3 and FBLN1. Fetus 2 had a mosaicism karyotype, with 12% of cells harboring a 6.6 Mb deletion in 22q13.31q13.33, covering 48 OMIM genes such as SHANK3 and PPARA, and 5% of cells harboring a 26.1 Mb duplication in 22q11.1q13.2 involving 285 OMIM genes. Fetus 3 carried a tandem duplication of 1.7 Mb in 22q11.1q11.21, which involved 10 OMIM genes including CECR1, CECR2 and ATP6V1E1. No abnormality was found in the three couples by chromosomal karyotyping and SNP array analysis.
CONCLUSION:The severity of diseases caused by chromosome 22 abnormalities not only depends on the range of the deletion or duplication, but is also closely related to chromosome structure, gene dose and genetic environment. Combined ultrasonography and various genetic testing techniques in prenatal diagnosis can greatly increase the detection rate of genetic diseases with substantial phenotypic variation.
