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Articles by E Orwoll
Total Records ( 2 ) for E Orwoll
  J Jiang , N. L. S Tang , C Ohlsson , A. L Eriksson , L Vandenput , C Liao , X Wang , F. W. K Chan , A Kwok , E Orwoll , T. C. Y Kwok , J Woo and P. C. Leung
  BACKGROUND:

Results of recent studies have demonstrated that genetic variants of the enzyme steroid 5 reductase type II (SRD5A2) are associated with serum concentrations of major androgen metabolites such as conjugates of androstane-3,17β-diol-glucuronide (3-diol-G). However, this association was not consistently found among different ethnic groups. Thus, we aimed to determine whether the association with SRD5A2 genetic variations exists in a cohort of healthy Chinese elderly men, by examining 2 metabolite conjugates: androstane-3,l7β-diol-3-glucuronide (3-diol-3G) and androstane-3,17β-diol-17-glucuronide (3-diol-17G).

METHODS:

We used GC-MS and LC-MS to measure serum sex steroid concentrations, including testosterone and dihydrotestosterone, and 3-diol-3G and 3-diol-17G in 1182 Chinese elderly men age 65 and older. Genotyping of the 3 SRD5A2 tagSNPs [rs3731586, rs12470143, and rs523349 (V89L)] was performed by using melting-temperature–shift allele-specific PCR.

RESULTS:

The well-described SRD5A2 missense variant rs523349 (V89L) was modestly associated with the 3-diol-17G concentration (P = 0.040). On the other hand, SNP rs12470143 was found to be significantly correlated with 3-diol-3G concentration (P = 0.021). Results of haplotype analysis suggested that the presence of an A-C-G haplotype leads to an increased 3-diol-3G concentration, a finding consistent with results of single SNP analysis.

CONCLUSIONS:

The genetic variation of SRD5A2 is associated with circulating 3-diol-3G and 3-diol-17G concentrations in Chinese elderly men. In addition, we showed that SRD5A2 haplotypic association, rather than a single SNP alone, might be a better predictor of the 3-diol-G concentration. Thus, the effect of either the haplotype itself or of other ungenotyped SNPs in linkage disequilibrium with the haplotype is responsible for the interindividual variation of 3-diol-G.

  Y Fu , Z Chen , A. I. F Blakemore , E Orwoll and D. M. Cohen
 

Copy number variation (CNV) is increasingly recognized as a source of phenotypic variation among humans. We hypothesized that a CNV in the human arginine vasopressin receptor-2 gene (AVPR2) would be associated with serum sodium concentration based on the following lines of evidence: 1) the protein product of the AVPR2 gene is essential for renal water conservation; 2) mutations in the AVPR2 gene are associated with aberrant water balance in humans; 3) heritability of serum sodium concentration may be greater in females than in males; 4) the AVPR2 gene is X-linked; and 5) a common CNV spanning the AVPR2 gene was recently described in a non-Hispanic Caucasian population. We developed a highly reproducible assay for AVPR2 CNV. Among 279 subjects with measured serum sodium concentration in the Offspring Cohort of the Framingham Heart Study, no subjects exhibited CNV at the AVPR2 locus. Among 517 subjects in the Osteoporotic Fractures in Men Study (MrOS)—including 152 with hyponatremia and 183 with hypernatremia—no subjects with CNV at the AVPR2 locus were identified. CNV at the AVPR2 locus could not be independently confirmed, and CNV at the AVPR2 gene is unlikely to influence systemic water balance on a population-wide basis in non-Hispanic Caucasian subjects. A novel AVPR2 single nucleotide polymorphism affecting the reporter hybridization site gave rise to an artifactually low copy number signal (i.e., less than unity) in one male African American subject. Reanalysis of the original comparative genomic hybridization data revealed bona fide CNVs flanking—but not incorporating—the AVPR2 gene, consistent with our new genotyping data.

 
 
 
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