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2009 Vienna - European Society of Human Genetics

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Statistical genetics, includes Mapping, linkage and association methods<br />

P07.12<br />

Screening <strong>of</strong> TERC gene amplification as an additional genetic<br />

diagnostic test in detection <strong>of</strong> cervical pre-neoplastic lesions<br />

N. Kokalj Vokac, T. Kodric, A. Erjavec Skerget, A. Zagorac, I. Takac;<br />

University Medical Centre Maribor, Maribor, Slovenia.<br />

The aim <strong>of</strong> the current study was to present TERC gene amplification<br />

as possible diagnostic marker for use in routine cytological screening<br />

to improve the accuracy <strong>of</strong> conventional screening procedure in detection<br />

<strong>of</strong> cervical pre-neoplastic lesions.<br />

Cervical smears were screened and classified as low-grade squamous<br />

intraepithelial lesions (LSIL) and high-grade squamous intraepithelial<br />

lesions (HSIL). From the same specimens FISH procedure using<br />

TERC-specific DNA probe was performed. Copy number enumeration<br />

for TERC gene was evaluated. More than 2 signals per cell were<br />

considered as TERC positive case. In cervical smears graded after<br />

conisation as CIN1, no TERC positive cases were found in either LSIL<br />

or HSIL. Neither was TERC amplifications found in LSIL cases with<br />

histological results CIN1 and CIN 2. Amplifications <strong>of</strong> the TERC gene<br />

first appeared in HSIL cases with CIN2 histology. In the group <strong>of</strong> CIN3,<br />

TERC positive cases were present in LSIL and HSIL. In these, there<br />

were no statistically significant differences between TERC positive<br />

and TERC negative cases. Statistically significant differences in TERC<br />

positive cases were found between LSIH and HSIL without regard to<br />

the CIN grade.<br />

From the results obtained, it can be concluded that TERC gene amplifications<br />

inevitably lead to a high risk <strong>of</strong> CIN3 in both LSIL and HSIL<br />

after cytological smear examination. A high CIN is not necessarily correlated<br />

with TERC amplification, but a positive TERC result certainly<br />

demands a high CIN classification.<br />

P08.01<br />

contribution <strong>of</strong> AcE i/D polymorphism to the risk <strong>of</strong> end stage<br />

renal disease in Romanian population<br />

N. M. Panduru1 , D. Cimponeriu2 , P. Apostol2 , M. Stavarachi2 , M. L. Toma2 , M.<br />

Mota3 , E. Mota3 , C. Serafinceanu1 , M. Panduru2 , D. M. Cheta1 ;<br />

1 2 IDNBM, Bucharest, Romania, Institute <strong>of</strong> <strong>Genetics</strong>, Bucharest, Romania,<br />

3University <strong>of</strong> Medicine and Pharmacy Craiova, Craiova, Romania.<br />

Introduction: End stage kidney disease (ESRD) is due to diabetes, hypertension,<br />

glomerulonephritis and cystic kidney disease. All this diseases<br />

seems to be connected with a genetic background which is predisposing<br />

to the development <strong>of</strong> the disease. Because diabetes and<br />

hypertension are the first two causes for ESRD and rennin angiotensn<br />

system has a important role in pathogenesis <strong>of</strong> this affection, ACE<br />

polymorphisms, specially ACE I/D have been extensively studied.<br />

Aim: The aim <strong>of</strong> the present study is to evaluate the contribution <strong>of</strong><br />

ACE I/D polymorphism to the risk <strong>of</strong> development <strong>of</strong> ESRD in diabetic<br />

and non-diabetic Romanian population.<br />

Material and method: Clinical data and blood sample were collected<br />

from 321 Romanian type 1 diabetic patients, after inform consent. The<br />

patients were divided in three groups 1-healthy controls (119 patients),<br />

2-ESRD due to other causes except diabetes (119 patients), 3-ESRD<br />

with diabetes (83 patients). Genomic DNA was extracted from peripheral<br />

blood leucocytes using commercial kits and the ACE I/D polymorphism<br />

was assessed by PCR-RFLP.<br />

Results: The sample population is in Hardy-Weinberg equilibrium.<br />

The DD genotype was found in 36,13% in non-diabetic subjects and<br />

32,25% in diabetic subjects comparative with 31,09% in healthy controls.<br />

The ID genotype frequency was 49,57% in healthy controls,<br />

48,75% in non-diabetic patients with ESRD and 53,01% in diabetic<br />

subjects with renal insufficiency.<br />

Conclusions: The DD genotype does not seems to confer a high risk<br />

for renal insufficiency in diabetic patients (OR=1,068, CI=95%) and in<br />

non-diabetic patients (OR=1,253, CI=95%). The heterozygote genotypes<br />

had a smaller risk for ESRD.<br />

P08.02<br />

incorporating Quantitative covariates into simultaneous<br />

Localization <strong>of</strong> two Linked Loci Using Affected Relative Pairs<br />

Y. Chiu1 , J. Chiou2 , L. Chun-Yi1 ;<br />

1 2 National Health Research Institues, Zhunan, Taiwan, Academia Sinica, Taipei,<br />

Taiwan.<br />

Many dichotomous traits for complex diseases are <strong>of</strong>ten involved more<br />

than one locus and/or associated with quantitative biomarkers or envi-<br />

ronmental factors. Incorporating these quantitative variables into linkage<br />

analysis as well as localizing two linked disease loci simultaneously<br />

could therefore improve the efficiency in mapping genes. Previously,<br />

we proposed a robust multipoint Identity-by-Descent (IBD) approach<br />

to estimate a disease locus using affected sib pairs with incorporation<br />

<strong>of</strong> a quantitative covariate. In the present study, we extended this<br />

approach to simultaneously estimate two linked loci using different<br />

types <strong>of</strong> affected relative pairs (ARPs). We showed the efficiency was<br />

enhanced by localizing two disease loci simultaneously and by using<br />

relative pairs than using affected sib pairs alone after incorporating a<br />

quantitative covariate through parametric or non-parametric modeling.<br />

In addition to help identify factors associated with the disease and to<br />

improve the efficiency in estimating disease loci, this extension also<br />

allows us to account for heterogeneity in risk ratios for different ARPs.<br />

The collaborative study on the genetics <strong>of</strong> alcoholism (COGA) data<br />

released for GAW14 was used to illustrate the application <strong>of</strong> this extended<br />

method. The quantitative variable “maximum number <strong>of</strong> drinks<br />

in a 24 hour period” was incorporated into the linkage mapping when<br />

searching for two linked disease loci simultaneously using affected<br />

relative pairs. This example illustrated that the efficiency in estimating<br />

disease loci was enhanced by incorporating a quantitative covariate,<br />

by using all relative pairs as well as by mapping two linked loci simultaneously.<br />

P08.03<br />

Alcoholism and genetic polymorphisms <strong>of</strong> gabaergic system: an<br />

experimental sNPstream study<br />

M. Tucci 1 , C. Terranova 1 , M. Curtarello 1 , L. Barzon 2 , G. Palu 2 , G. Forza 1 , S.<br />

Ferrara 1 ;<br />

1 Section <strong>of</strong> Legal Medicine - University <strong>of</strong> Padova, Padova, Italy, 2 Department<br />

<strong>of</strong> Histology, Microbiology and medical Biotechnology - University <strong>of</strong> Padova,<br />

Padova, Italy.<br />

Previous studies have advanced the hypothesis that gamma-aminobutyric<br />

acid (GABA) is associated to alcohol use disorder (abuse and<br />

dependence). This association is suggested by studies that link alcohol<br />

to withdrawal tolerance, and the symptoms that define alcohol use<br />

disorder. The aim <strong>of</strong> our study was to examine single nucleotide polymorphisms<br />

(SNPs) in the glutamate decarboxylase (GAD) 67 gene,<br />

the rate-limiting enzyme in the synthesis <strong>of</strong> GABA, associated with<br />

alcohol abuse.<br />

The research has been structured as a case-control study. The total<br />

cohort analyzed was 283 individuals, 107 <strong>of</strong> which were alcohol<br />

dependent according to the DSM IV TR criteria and 176 controls recruited<br />

from blood donors. The study protocol has been approved by<br />

Ethical Committee.<br />

Specifically we analyzed 26 SNPs localized in the coding and in<br />

the untranslated regions <strong>of</strong> the GAD 67 gene with the GenomeLab<br />

SNPStream Genotyping System. Our preliminary results show a significant<br />

difference in genotype distribution <strong>of</strong> one SNP (rs 11542313)<br />

localized in the exon 3 <strong>of</strong> the GAD 67 gene that is responsible for a<br />

silent mutation HIS-HIS (p=0.0015). In order to clarify the meaning <strong>of</strong><br />

this association, further genetic analysis are being undertaken. In particular,<br />

we are investigating other genetic polymorphisms up and down<br />

stream from rs 11542313 that could interfere with splicing and/or GAD<br />

67 mRNA stability.<br />

P08.04<br />

Association analysis <strong>of</strong> sNPs in the APP, RUNX1 and DiRK1A<br />

genes on chromosome 21 with late-onset <strong>of</strong> Alzheimer‘s disease<br />

in a sample <strong>of</strong> mexican patients<br />

C. V. Venegas 1 , F. Fernandez 2 , F. Mena 2 , L. Gutierrez 3 , O. Rosas 4 , Z. Najera 5 ,<br />

S. K<strong>of</strong>man 6 ;<br />

1 Hospital General de Mexico. Facultad de Medicina. Universidad Nacional<br />

Autónoma de México, Mexico. D.F, Mexico, 2 Hospital General de Mexico, Mexico.<br />

D.F, Mexico, 3 Servicio de Geriatría, Instituto Nacional de la Nutrición y Ciencias<br />

Médicas, Mexico, 4 Servicio de Geriatría, Instituto Nacional de la Nutrición y<br />

Ciencias Médicas, Mexico. D.F, Mexico, 5 Facultad de Ciencias, UNAM, Mexico.<br />

D.F, Mexico, 6 Hospital General de Mexico, Facultad de Medicina, Universidad<br />

Nacional Autónoma de México, Mexico. D.F, Mexico.<br />

Background: The β Amyloid precursor protein (APP), Runt-related<br />

transcription factor 1 (RUNX1) and dual-specificity tyrosine (Y) phosphorylation-regulated<br />

kinase 1A (DYRK1A) genes are strong positional<br />

and biologic candidates for late-onset Alzheimer disease (LOAD) sus-

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