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Chen L, Wang L, Zeng Y, Yin D, Tang F, Xie D, Zhu H, Li L, Wang J. A prenatal case misunderstood as specimen confusion: 46,XY/46,XY chimerism. BMC Pregnancy Childbirth 2024; 24:126. [PMID: 38347456 PMCID: PMC10860253 DOI: 10.1186/s12884-024-06321-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Accepted: 02/05/2024] [Indexed: 02/15/2024] Open
Abstract
Chimerism results from the fusion of two zygotes in a single embryo, whereas mosaicism results from mitotic errors in a single zygote. True human chimerism is rare, with fewer than 100 cases reported in the literature. Here, we report a case in which the fetus was identified as having tetragametic chimerism based on short tandem repeat - polymerase chain reaction analysis of the family observed during amniocentesis for advanced maternal age. The chimerism occurred via the fertilization of two ova by two spermatozoa, followed by the fusion of early embryos. The genotypes of the two amniotic fluid samples obtained successively by one puncture were completely different, and the sex chromosomes were XY. Karyotyping and copy number variation sequencing showed no abnormalities. The fetus was delivered at term and the phenotype of the newborn was normal.
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Affiliation(s)
- Lin Chen
- Department of Medical Genetics / Prenatal Diagnostic Center, West China Second University Hospital, Sichuan University, Block 3 No. 20, Ren Min Nan Road, Wuhou District, Chengdu, 610041, China
- Key Laboratory of Birth Defects and Related Diseases of Women and Children, Sichuan University, Ministry of Education, Chengdu, 610041, China
| | - Li Wang
- Department of Medical Genetics / Prenatal Diagnostic Center, West China Second University Hospital, Sichuan University, Block 3 No. 20, Ren Min Nan Road, Wuhou District, Chengdu, 610041, China
- Key Laboratory of Birth Defects and Related Diseases of Women and Children, Sichuan University, Ministry of Education, Chengdu, 610041, China
| | - Yang Zeng
- Department of Medical Genetics / Prenatal Diagnostic Center, West China Second University Hospital, Sichuan University, Block 3 No. 20, Ren Min Nan Road, Wuhou District, Chengdu, 610041, China
- Key Laboratory of Birth Defects and Related Diseases of Women and Children, Sichuan University, Ministry of Education, Chengdu, 610041, China
| | - Daishu Yin
- Department of Medical Genetics / Prenatal Diagnostic Center, West China Second University Hospital, Sichuan University, Block 3 No. 20, Ren Min Nan Road, Wuhou District, Chengdu, 610041, China
- Key Laboratory of Birth Defects and Related Diseases of Women and Children, Sichuan University, Ministry of Education, Chengdu, 610041, China
| | - Feng Tang
- Department of Medical Genetics / Prenatal Diagnostic Center, West China Second University Hospital, Sichuan University, Block 3 No. 20, Ren Min Nan Road, Wuhou District, Chengdu, 610041, China
- Key Laboratory of Birth Defects and Related Diseases of Women and Children, Sichuan University, Ministry of Education, Chengdu, 610041, China
| | - Dan Xie
- Department of Medical Genetics / Prenatal Diagnostic Center, West China Second University Hospital, Sichuan University, Block 3 No. 20, Ren Min Nan Road, Wuhou District, Chengdu, 610041, China
- Key Laboratory of Birth Defects and Related Diseases of Women and Children, Sichuan University, Ministry of Education, Chengdu, 610041, China
| | - Hongmei Zhu
- Department of Medical Genetics / Prenatal Diagnostic Center, West China Second University Hospital, Sichuan University, Block 3 No. 20, Ren Min Nan Road, Wuhou District, Chengdu, 610041, China
- Key Laboratory of Birth Defects and Related Diseases of Women and Children, Sichuan University, Ministry of Education, Chengdu, 610041, China
| | - Lingping Li
- Department of Medical Genetics / Prenatal Diagnostic Center, West China Second University Hospital, Sichuan University, Block 3 No. 20, Ren Min Nan Road, Wuhou District, Chengdu, 610041, China
- Key Laboratory of Birth Defects and Related Diseases of Women and Children, Sichuan University, Ministry of Education, Chengdu, 610041, China
| | - Jing Wang
- Department of Medical Genetics / Prenatal Diagnostic Center, West China Second University Hospital, Sichuan University, Block 3 No. 20, Ren Min Nan Road, Wuhou District, Chengdu, 610041, China.
- Key Laboratory of Birth Defects and Related Diseases of Women and Children, Sichuan University, Ministry of Education, Chengdu, 610041, China.
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