Congenital central hypoventilation syndrome: analysis of PHOX2B gene mutation in a case.
10.3760/cma.j.issn.1003-9406.2015.05.012
- Author:
Yousheng YAN
1
;
Bin YI
;
Donghai LIU
;
Fangping ZHAO
;
Chuan ZHANG
;
Xue CHEN
;
Shengju HAO
Author Information
1. Gansu Provincial Maternal and Child Health Care Hospital, Gansu Provincial Medical Genetics Center, Gansu Provincial Neonatal Intensive Care Unit, Lanzhou, Gansu 730050, P.R. China. Email: haosj165@126.com.
- Publication Type:Journal Article
- MeSH:
Female;
Homeodomain Proteins;
genetics;
Humans;
Hypoventilation;
congenital;
genetics;
Infant, Newborn;
Mutation;
Sleep Apnea, Central;
genetics;
Transcription Factors;
genetics
- From:
Chinese Journal of Medical Genetics
2015;32(5):665-669
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVE To report on the phenotype of an infant with central hypoventilation syndrome (CCHS) and result of PHOX2B gene mutation analysis for the purpose of genetic counseling and prenatal diagnosis. METHODS Clinical data of an infant with CCHS was collected and analyzed. Potential mutation of PHOX2B gene was analyzed by amplified fragment length polymorphism (amp-FLP) and DNA sequencing. RESULTS The patient had typical clinical features of CCHS including frequent hypoventilation during sleeping, hypoxemia and hypercapnia which could be corrected by continuous ventilatory support. She also had repeated bruising and was difficult-to-wean, but without any cardiac, pulmonary, neuromuscular or brainstem lesions. DNA sequencing and amp-FLP of the PHOX2B gene showed that the patient has carried a polyalanine expansion repeat mutation (PARM) in exon 3. A 27 bp duplication was confirmed in the repeat sequence of 20 alanines by cloned and sequenced. This has led to an expansion of the repeat tract to 29 alanines. The genotype was therefore 20/29. CONCLUSION A patient with CCHS has been described. Mutation screening of PHOX2B gene can be used as an important support for diagnosis and genetic counseling for such patients.
