Laboratory Medicine ›› 2026, Vol. 41 ›› Issue (2): 106-111.DOI: 10.3969/j.issn.1673-8640.2026.02.002

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Genetic analysis and pregnancy outcomes of 19 fetuses with abnormal copy number in 22q11.2 region of chromosome

MA Shanshan, ZHANG Rong, YIN Ting, ZHENG Anshun, WANG Zhiwei, WANG Yongan, WANG Leilei()   

  1. Lianyungang Maternal and Child Health Care HospitalLianyungang 222000,Jiangsu, China
  • Received:2025-02-14 Revised:2025-07-01 Online:2026-02-28 Published:2026-03-06

Abstract:

Objective To investigate the relationship between 22q11.2 microdeletions and microduplications and clinical phenotypes,and to provide a reference for clinical genetic counseling. Methods From January 2015 to May 2023,19 patients diagnosed with 22q11.2 microdeletions and microduplications by chromosomal microarray analysis(CMA) at Lianyungang Maternal and Child Health Care Hospital were enrolled. The clinical phenotypes,pregnancy follow-up outcomes and pathogenic genes of these patients were analyzed. The follow-up for live-born newborns of 19 pregnant women was conducted. Results Among the 19 pregnant women,8 cases had 22q11.2 microdeletions,and 11 cases had microduplications. The main pathogenic genes involved were TBX1 and CRKL. Among the 8 pregnant women with 22q11.2 microdeletions,5 fetuses had abnormal heart development. Among the 11 pregnant women with 22q11.2 microduplications,no heart-related abnormalities were found. Among the 8 pregnant women with 22q11.2 microdeletions,5 cases terminated the pregnancy,2 cases had spontaneous abortions,and 1 case had a birth(at the time of the follow-up,the newborn was 6 months old,and no obvious abnormalities were observed in the phenotype). Among the 11 pregnant women with 22q11.2 microduplications,4 cases terminated the pregnancy,and 7 cases had births(a 4-year-old boy with delayed fontanel closure,the phenotypes of the other 6 cases were not significantly abnormal at the time of the follow-up). Conclusions Compared with microduplications,microdeletions show a wider range of clinical phenotypes and a stronger association with congenital heart defects(CHD).

Key words: 22Q11.2 microdeletion, 22Q11.2 microduplication, Genetic analysis, Chromosome microarray, Pregnancy outcome

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