Clinical Genetics
Kleefstra syndrome 1 and ring chromosome 9 in a case
Lyu Nan, Li Dongxiao, Li Jingjie, Shang Qing, Ma Caiyun
Published 2019-08-10
Cite as Chin J Med Genet, 2019, 36(8): 837-840. DOI: 10.3760/cma.j.issn.1003-9406.2019.08.021
Abstract
ObjectiveTo analyze the clinical and molecular genetic characteristics of patient with Kleefstra syndrome 1.
MethodsClinical data, chromosomal karyotype and whole genome copy number variations (CNVs) of the patient were analyzed.
ResultsThe patient was found to have a karyotype of 45, XX, -9[4]/46, XX, r(9)(p24q34)[56]. Whole-genome CNVs detection revealed that she has carried a heterozygous deletion of approximately 670 kb at 9q34.3, which encompassed the entireEHMT1 gene. The region is strongly associated with Kleefstra syndrome (1/9q telomere deletion). In addition, the patient also had heterozygous deletion of 9pter, which may predispose to formation of ring chromosome 9.
ConclusionThe child was diagnosed with Kleefstra syndrome type 1 in conjunct with ring chromosome 9.
Key words:
Kleefstra syndrome 1; 9q34.3 microdeletion; EHMT1 gene; Ring chromosome 9
Contributor Information
Lyu Nan
Rehabilitation Center, Children’s Hospital Affiliated to Zhengzhou University, Zhengzhou, Henan 450003, China
Li Dongxiao
Henan Provincial Key Laboratory for Inborn Error of Metabolism, Children’s Hospital Affiliated to Zhengzhou University, Children’s Hospital of Henan Province, Zhengzhou Children’s Hospital, Zhengzhou, Henan 450003, China
Li Jingjie
Rehabilitation Center, Children’s Hospital Affiliated to Zhengzhou University, Zhengzhou, Henan 450003, China
Shang Qing
Rehabilitation Center, Children’s Hospital Affiliated to Zhengzhou University, Zhengzhou, Henan 450003, China
Ma Caiyun
Rehabilitation Center, Children’s Hospital Affiliated to Zhengzhou University, Zhengzhou, Henan 450003, China