Clinical Genetics
Genetic analysis of a rare case of Pitt-Hopkins syndrome due to partial deletion of TCF4 gene
Shen Xueping, Qi Fengfeng, Gu Chunjian
Published 2020-04-10
Cite as Chin J Med Genet, 2020, 37(4): 459-461. DOI: 10.3760/cma.j.issn.1003-9406.2020.04.024
Abstract
ObjectiveTo explore the genetic basis for a child with delayed intellectual development.
MethodsThe child and his parents were subjected to conventional G-banding karyotyping and single nucleotide polymorphism array (SNP-array) analysis. Suspected copy number variations (CNVs) were verified in both parents.
ResultsNo karyotypic abnormality was found with the child and his parents. SNP-array results for both parents were normal. The child was found to harbor a de novo 172 kb deletion at 18q21.2 with a physical position of 52 957 042-53 129 237. The deletion only involved one OMIM gene, namely TCF4, resulting in removal of its exons 6 to 8.
ConclusionThe SNP-array assay has facilitated with the diagnosis of this child. Deletion of 18q21.2 region probably accounts for the Pitt-Hopkins syndrome (PTHS) in this patient.
Key words:
TCF4 gene; Single nucleotide polymorphism microarray; Pitt-Hopkins syndrome; 18q21.2
Contributor Information
Shen Xueping
Center of Prenatal Diagnosis, Huzhou Maternity and Child Health Care Hospital, Zhejiang 313000, China
Qi Fengfeng
Center of Prenatal Diagnosis, Huzhou Maternity and Child Health Care Hospital, Zhejiang 313000, China
Gu Chunjian
Center of Prenatal Diagnosis, Huzhou Maternity and Child Health Care Hospital, Zhejiang 313000, China