[Genetic analysis of four individuals harboring a 16q22 fragile site]
Xiaoxiao Huang1, Rong Qiang, Yuan Liu
1Center of Medical Genetics, Northwest Women's and Children's Hospital, Xi'an, Shaanxi 710061, China. bqtnwch@126.com.
Objective:
To analyze four patients with a 16q22 fragile site with miscarriage or infertility by using cytogenetic methods.
Methods:
Four patients presented at Northwest Women's and Children's Hospital between January 2022 and December 2024 were selected as the study subjects. Peripheral blood samples were collected from the patients and subjected to G-banded chromosomal karyotyping, among whom two were also subjected to copy number variation (CNV) sequencing. This study has been approved by the Ethics Committee of the Hospital (Ethics No. 2020-022).
Results:
The chromosomal karyotypes of the patients were mos 46,XX,fra(16)(q22)[26]/47,XX,del(16)(q22),+chrb(16)(q22)[4]/46,XX,del(16)(q22)[3]/46,XX[91], mos 46,XY,fra(16)(q22)[21]/46,XY,del(16)(q22)[3]/46,XY[76], mos 46,XX,fra(16)(q22)[21]/ 46,XX,del(16)(q22)[4]/46,XX[75] and mos 46,XX,fra(16)(q22)[16]/46,XX,del(16)(q22)[7]/47,XX,del(16)(q22),+chrb(16)(q22)[6]/47,XX,fra(16)(q22),+chrb(16)(q22)[3]/46,XX[68], respectively. CNV sequencing of patients 2 and 4 revealed no deletion or duplication on chromosome 16.
Conclusion:
Identification of the 16q22 fragile site has facilitated genetic counseling for these patients.
