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Published on: February 21, 2015
Developmental retardation due to paternal 5q/11q translocation in a Chinese infant: clinical, chromosomal and
Xiangyu Zhao1, Hongyan Xu, Chen Zhao
1Department of Medical Genetics, Linyi People's Hospital, Linyi 276003, Shandong, People's Republic of China. lilinxy1996@163.com.
Insights
Chromosomal translocation in parents can lead to birth defects. This study identified a paternal translocation between chromosomes 5 and 11 in a Chinese infant with multiple malformations, using chromosomal microarray analysis and fluorescence in situ hybridization.
Area of Science:
- Human Genetics
- Medical Genetics
- Reproductive Genetics
Background:
- Parental chromosomal translocations increase risks of miscarriage and embryonic death.
- Normal gestation and delivery are still possible in carriers of chromosomal translocations.
- Genetic factors underlying multiple malformations and developmental retardation require investigation.
Abstract:
Although it is known that the parental carriers of chromosomal translocation are considered to be at high risk for spontaneous abortion and embryonic death, normal gestation and delivery remain possible. This study aims to investigate the genetic factors of a Chinese infant with multiple malformations and severe postnatal development retardation. In this study, the routine cytogenetic analysis, chromosomal microarray analysis (CMA) and fluorescence in situ hybridization (FISH) analysis were performed. Conventional karyotype analyses revealed normal karyotypes of all family members. CMA of the DNA of the proband revealed a 8.3 Mb duplication of 5q35.1-qter and a 6.9 Mb deletion of 11q24.3-qter. FISH analyses verified a paternal tiny translocation between the long arm of chromosomes 5 and 11. Our investigation serves to provide important information on genetic counselling for the patient and future pregnancies in this family. Moreover, the combined use of CMA and FISH is effective for clarifying pathogenically submicroscopic copy number variants.
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