Original Article
Prenatal diagnosis for a pedigree affected with Wolf-Hirschhorn syndrome due to a subtle chromosomal translocation
Ya Xing, Shiyi Xiong, Meizhen Yuan, Linbei Deng, Jia Zhou, Gang Zou, Luming Sun
Published 2019-07-10
Cite as Chin J Med Genet, 2019, 36(7): 682-685. DOI: 10.3760/cma.j.issn.1003-9406.2019.07.006
Abstract
ObjectiveTo make molecular diagnosis of an infant affected with severe developmental delay and multiple birth defects, assisting prenatal diagnosis for the second pregnancy.
MethodsStandard G-banded karyotyping was performed for the fetus and his parents. Single nucleotide polymorphism array (SNP array) was used to detect submicroscopic chromosomal aberration. Fluorescence in situ hybridization (FISH) was employed to determine the parental origin of the aberration.
ResultsBoth the proband and the fetus harbored a 5.4 Mb distal 4p deletion and a 6.9 Mb distal 6q duplication. FISH confirmed that the mother has carried a balanced translocation involving 4p and 6q.
ConclusionThe unbalanced chromosomal aberration in the proband and the fetus were both derived from the mother. Both patients showed a Wolf-Hirschhorn syndrom phenotype and partial phenotype of 6q trisomy. SNP array combined with FISH are essential for the detection of cryptic chromosomal aberrations which may be missed by coventional karyotyping analysis.
Key words:
Unbalanced Wolf-Hirschhorn syndrome; Cryptic translocation; Mental retardation; Single nucleotide polymorphism-array; Fluorescence in situ hybridization
Contributor Information
Ya Xing
Department of Fetal Medicine, Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine, Shanghai 201204, China
Shiyi Xiong
Meizhen Yuan
Linbei Deng
Jia Zhou
Gang Zou
Luming Sun