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Articles by F. Tassone
Total Records ( 2 ) for F. Tassone
  S Filipovic Sadic , S Sah , L Chen , J Krosting , E Sekinger , W Zhang , P. J Hagerman , T. T Stenzel , A. G Hadd , G. J Latham and F. Tassone

Background: Fragile X syndrome (FXS) is a trinucleotide-repeat disease caused by the expansion of CGG sequences in the 5' untranslated region of the FMR1 (fragile X mental retardation 1) gene. Molecular diagnoses of FXS and other emerging FMR1 disorders typically rely on 2 tests, PCR and Southern blotting; however, performance or throughput limitations of these methods currently constrain routine testing.

Methods: We evaluated a novel FMR1 gene–specific PCR technology with DNA templates from 20 cell lines and 146 blinded clinical samples. The CGG repeat number was determined by fragment sizing of PCR amplicons with capillary electrophoresis, and results were compared with those for FMR1 Southern blotting analyses with the same samples.

Results: The FMR1 PCR accurately detected full-mutation alleles up to at least 1300 CGG repeats and consisting of >99% GC character. All categories of alleles detected by Southern blotting, including 66 samples with full mutations, were also identified by the FMR1 PCR for each of the 146 clinical samples. Because all full mutation alleles in samples from heterozygous females were detected by the PCR, allele zygosity was reconciled in every case. The PCR reagents also detected a 1% mass fraction of a 940-CGG allele in a background of 99% 23-CGG allele—a roughly 5- fold greater sensitivity than obtained with Southern blotting.

Conclusions: The novel PCR technology can accurately categorize the spectrum of FMR1 alleles, including alleles previously considered too large to amplify; reproducibly detect low abundance full mutation alleles; and correctly infer homozygosity in female samples, thus greatly reducing the need for sample reflexing to Southern blotting.

  F. Tassone , M. Procopio , L. Gianotti , G. Visconti , A. Pia , M. Terzolo and G. Borretta
  AimsAn increased frequency of both impaired glucose tolerance and Type 2 diabetes mellitus (DM) has been reported in primary hyperparathyroidism (pHPT), thus we sought to investigate insulin sensitivity and insulin secretion in a large series of pHPT patients. Subjects and methodsOne hundred and twenty-two consecutive pHPT patients without known DM were investigated [age (mean±sd) 59.3±13.6years, body mass index (BMI) 25.7±4.2kg/m2; serum calcium 2.8±0.25mmol/l; PTH 203.2±145.4ng/l]. Sixty-one control subjects were matched, according to the degree of glucose tolerance, in a 2:1 patient:control ratio. Fasting- and oral glucose tolerance test-derived estimates of insulin sensitivity and secretion were determined by means of the quantitative insulin sensitivity check index (QUICKI) and the insulin sensitivity index (ISI) composite. ResultsBoth the QUICKI and ISI composite were lower in pHPT patients than control subjects (P<0.03 and P<0.05, respectively) after adjusting for age, systolic blood pressure and BMI. Conversely, all insulin secretion estimates were significantly increased in pHPT patients than in control subjects (P<0.04 and P<0.03, respectively) and after adjusting for age, systolic blood pressure and BMI. Log serum calcium levels were negatively associated with the QUICKI and log ISI composite (R=-0.30, P=0.001; R=-0.23, P=0.020, respectively) in pHPT patients. Serum calcium levels significantly and independently contributed to impaired insulin sensitivity in multivariate analysis (QUICKI as dependent variable: β=-0.31, P=0.004, R2=0.15; log ISI composite as dependent variable: β=-0.29, P=0.005, R2=0.16). ConclusionsOur study confirms a reduction in both basal and stimulated insulin sensitivity in primary hyperparathyroidism, in spite of increased insulin secretion. Moreover, our data show for the first time a significant relationship between hypercalcaemia and insulin sensitivity in this condition.
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