Heterozygous mutations of the sodium chloride cotransporter in Chinese children: prevalence and association with blood pressure.
BACKGROUND
Gitelman's syndrome (GS), which is caused by homozygous or compound heterozygous mutations of the thiazide-sensitive sodium chloride cotransporter (NCC), usually manifests in children and is associated with low blood pressure. However, the prevalence of heterozygous NCC mutations and their association with blood pressure in children have not yet been studied.


METHODS
Five hundred unrelated children from the Taipei Children Heart Study were enrolled. Genomic DNA was isolated from peripheral blood and the SLC12A3 gene was amplified by polymerase chain reaction (PCR). The 15 NCC mutations previously identified in Chinese patients with GS were evaluated using restriction fragment length polymorphism (RFLP) analysis. Blood pressure, biochemistry and urine pH were measured. The allelic frequency of heterozygous NCC mutations and their association with low blood pressure were also investigated.


RESULTS
RFLP analysis for the 15 NCC mutations revealed heterozygous T60M in 1 child, T163M in 1, S283Y in 4, R642C in 2, W844X in 2, R928C in 9 and R959frameshift in 10 children. The overall incidence of positive heterozygous NCC mutations was approximately 2.9%. There were no significant differences in systolic or diastolic blood pressure, biochemical profiles or urine pH between children with heterozygous NCC mutations (n = 29) and non-affected controls (n = 471), except for slightly higher fasting plasma glucose concentrations in NCC-heterozygous children (91 +/- 2.3 versus 88 +/- 0.4 mg/dL, P < 0.05). Examination among the different NCC mutations showed that these children also had comparable blood pressures.


CONCLUSIONS
We found a relatively high prevalence of heterozygous NCC mutations in Chinese children, suggesting that GS may not be rare in this population. Heterozygous NCC mutations were not associated with lower blood pressure in these Chinese children.
Hsu
Yu-Juei
YJ
Division of Nephrology, Department of Medicine, Tri-Service General Hospital, No. 325, Section 2, Cheng-Kung Road, Neihu 114, Taipei, Taiwan.
Yang
Sung-Sen
SS
Chu
Nain-Feng
NF
Sytwu
Huey-Kang
HK
Cheng
Chih-Jen
CJ
Lin
Shih-Hua
SH
D000293:Adolescent; D044466:Asian People; D002648:Child; D005260:Female; D005787:Gene Frequency; D053579:Gitelman Syndrome / Q000453:epidemiology / Q000235:genetics*; D006579:Heterozygote; D006801:Humans; D015994:Incidence; D008297:Male; D009154:Mutation; D015995:Prevalence; D011955:Receptors, Drug / Q000235:genetics*; D049992:Sodium Chloride Symporters / Q000235:genetics*; D064486:Solute Carrier Family 12, Member 3; D027981:Symporters / Q000235:genetics*
D011955:Receptors, Drug; C578874:SLC12A3 protein, human; D049992:Sodium Chloride Symporters; D064486:Solute Carrier Family 12, Member 3; D027981:Symporters