European Human Genetics Conference 2007 June 16 – 19, 2007 ...
European Human Genetics Conference 2007 June 16 – 19, 2007 ...
European Human Genetics Conference 2007 June 16 – 19, 2007 ...
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Clinical genetics<br />
These preliminary remarks well support the hard comparison of the<br />
clinical phenotype and natural history of three new italian patients, two<br />
females and one male, with complete maternal isodisomy (two cases)<br />
or heterodisomy of chromosome 14. Growth parameters, including<br />
pre- and postnatal length, weight, and OFC, heavily differ from borderline<br />
values to a hypochondroplasia-like phenotype. Similar variability<br />
was observed for the psychomotor development, completely normal<br />
in a subject, respectively mildly or seriously retarded in the two others.<br />
Feeding problems and obesity also differentiate the natural history of<br />
the three subjects. Precocious puberty was observed only in one of<br />
the two girls. In conclusion, we confirm the advisability of considering<br />
upd(14)mat in patients with low birth weight, growth retardation,<br />
neonatal feeding problems, muscular hypotonia, motor delay, precocious<br />
puberty and truncal obesity, as well as in patients with PWS like<br />
phenotype, negative for SNRPN mutation. The rapid testing, by using<br />
the methylation status of the imprinted MEG3 locus represents a new<br />
useful diagnostic tool.<br />
P0264. Molecular Analysis of Usher Syndrome Types 1 and 2 in<br />
Iranian Usher Patients<br />
K. Kahrizi 1 , G. Asaadi Tehrani 1,2 , N. Sadeghpour 1 , N. Bazazzadegan 1 , M.<br />
Mohseni 1 , M. Jaberi 3 , K. Jalalvand 1 , S. Arzhangi 1 , H. Emamjomeh 4 , R. J. H.<br />
Smith 5 , H. Najmabadi 1 ;<br />
1 Genetic Research Center, University of Social Welfare and Rehabilitation Science,<br />
Tehran, Islamic Republic of Iran, 2 Genetic Department, Science and Research<br />
Unit , Islamic Azad University, Tehran, Islamic Republic of Iran, 3 Retinitis<br />
Pigmentosa Institute, Tehran, Islamic Republic of Iran, 4 Research Center of Ear,<br />
Nose, Throat, and Head and Neck Surgery, Tehran, Islamic Republic of Iran,<br />
5 Molecular Otolaryngology Research Laboratories , Department of Otolaryngology<br />
Head and Neck Surgery , University of Iowa, Iowa, IA, United States.<br />
Usher syndrome (USH) is the most frequent cause of combined deaf-<br />
blindness. It is clinically and genetically heterogeneous and mainly<br />
inherited as an autosomal recessive trait. A total of 12 loci have been<br />
reported to be associated with the usher syndrome, assigned to the<br />
USH types (USH1A-G, USH2A-C and USH3A). From the three types<br />
are known for usher syndrome, type 1 and 2 are the most frequent<br />
forms and type 3 is the modest form, so the objective of this study was<br />
to investigate USH1 loci and USH2B between USH2 loci.<br />
We have performed linkage analysis for 30 families using STR polymorphic<br />
markers, for DFNB2, DFNB12, DFNB18, DFNB23 and DFNB6<br />
which mutation in the gene located in these loci cause ARNSHL as<br />
the same as USH1B, USH1C, USH1D, USH1F and USH2B. Our data<br />
up to now showed that in three families 3 STR markers (D10S1432,<br />
D10S537 and D10S535), used in this investigation linked to DFNB12,<br />
in which results conclude usher syndrome 1D in these families and<br />
in one family 3 STR markers ( D10S1226, D10S546 and D10S1762<br />
) linked to DFNB23, which is related to usher syndrome 1F in this<br />
family. We found a mutation in MYO7A (USH1B) and a mutation in<br />
VLGR1(USH2C).<br />
Based on our results we suggest that the gene CDH23 causing non<br />
syndromic autosomal recessive deafness (DFNB12) and deafness associated<br />
with retinitis pigmentosa and vestibular dysfunction (USH1D)<br />
has a higher prevalence in our population in comparison with other<br />
Usher loci.<br />
P0265. The development of uterine leiomyoma is associated with<br />
Val158Met polymorphism in COMT gene and the 3´-untranslated<br />
ApaI-IGF2 gene polymorphism in Russian population<br />
(Bashkortostan)<br />
O. Egorova 1 , M. Bermisheva 1 , E. Khusnutdinova 1 , N. Glebova 2 , A. Dodonov 2 ;<br />
1 Institute of Biochemistry ang <strong>Genetics</strong>, Ufa Scientific Center of Russian Academy<br />
of Sciences, Ufa, Russian Federation, 2 Bashkortostan State Medical University,<br />
Ufa, Russian Federation.<br />
Leiomyoma, the most common benign uterine neoplasm, occurs<br />
in around one-forth of women during their lifetimes. Leiomyoma is<br />
caused by a complex interaction between multiple genes, hormone,<br />
growth factor, cytokines, and the environment. Cytochrome P4501A1<br />
(CYP1A1), catechol-O-methyltransferase (COMT) and glutation-stransferase<br />
(GSTM1) are key enzymes in the estrogen metabolism<br />
pathway that result in the hydroxylation, methylation and conjugation.<br />
Estrogen (ESR1) and progesterone (PR) receptors are mediators of<br />
hormonal bioeffects. The IGF-II growth factor is known to support myoblasts<br />
differentiation among other cell types. P53 is a tumor suppres-<br />
sor gene.<br />
We evaluated the association between the GSTM1 null-allele, CYP1A1<br />
Ile462Val, COMT Val158Met, ESR1 PvuI and XbaII, p53 Arg72Pro,<br />
PR Progins and 3´-untranslated ApaI- IGF2 gene polymorphisms and<br />
uterine leiomyoma risk in a case-control study: 200 women with and<br />
200 without uterine leiomyoma living in the Bashkortostan (South Ural<br />
region of Russia).<br />
The frequency of the low-activity COMT Met/Met genotype was significantly<br />
higher in patients than in the healthy control group (44 %<br />
and 15%, respectively: x 2 = 29.96, p=0.0005; OR= 4.46, 95% CI 2.51-<br />
7.96).<br />
The frequency of AA homozygous (mutant allele) was significantly<br />
higher in women with leiomyomas than without (32 % and <strong>16</strong>%, respectively:<br />
x 2 = 11.0014, p=0.0017; OR=2.32, 95% CI 1.39-3.89).<br />
There was no significant difference between the two groups regarding<br />
the distribution of the GSTM1, CYP1A1, ESR1, PR and p53 genes<br />
polymorphisms frequencies.<br />
Our results suggest that the Val158Met polymorphism in COMT gene<br />
and the 3´-untranslated ApaI-IGF2 gene polymorphism are associated<br />
with increased risk of uterine leiomyoma in Bashkortostan population.<br />
P0266. Severe kaposiform hemangioendothelioma associated<br />
with Kasabach-Merritt Syndrome - genes need to be identified<br />
G. S. Doros 1 , B. S. Zoica 1 , M. Bataneant 1 , M. Serban 1 , M. Gafencu 1 , O. C.<br />
Ciocarlie 2 , J. Puiu 1 ;<br />
1 Victor Babes University of Medicine and Pharmacy, Timisoara, Romania, Timisoara,<br />
Romania, 2 Louis Turcanu Emergency Hospital for Children, Timisoara,<br />
Romania.<br />
Background: Vascular anomalies are localized errors of vascular development.<br />
Vascular tumors include: hemangioma, kaposiform hemangioendothelioma<br />
(KH) and tufted angioma. Genetic studies led to<br />
the identification of a number of genes that cause vascular malformations.<br />
KH is a rare vascular tumor usually presenting at birth or shortly thereafter.<br />
The tumor is locally aggressive and produces major complications.<br />
Aim: To present a rare case of severe KH in a 5yo girl, diagnosed at<br />
7 months, unresponsive to medical treatment. She developed major<br />
complications: Kassabach-Merritt-Syndrome and CHF.<br />
Matherial: At 7 months, the infant was admitted with a large vascular<br />
lesion involving the left side of the abdomen, left vulva and left leg. A<br />
large, rapidly growing, vascular tumor, warm, non pulsatile, red purple,<br />
tense, with significant distortion of anatomy was palpable in the abdomen.<br />
Clinical examination, Doppler ultrasound, MRI, biopsy and laboratory<br />
tests were performed.<br />
Results: KH was the diagnosis. Kassabach-Merritt-Syndrome was the<br />
first severe complication, manifested as thrombocytopenia and DIC.<br />
Parents refused chemotherapy; hence, treatment was: Prednisone, α-<br />
2a-IFN, blood products. Surgery was considered too dangerous given<br />
the size and location of the tumor. Despite all efforts, the tumor became<br />
giant, invalidating the child and life-threatening.<br />
Conclusions: Kasabach-Merritt-Syndrome and heart failure in unresponsive<br />
hemangioendothelioma to medical therapy raise the mortality<br />
risk from 30-40% to 50-55%. Gene therapy could be life-saving and<br />
despite the rarity of the disease no efforts should be spared to identify<br />
the genes involved in KH. In such cases gene therapy could be the<br />
only chance for survival.<br />
P0267. Reverse-hybridization-based genetic testing for the<br />
prediction of anticoagulant dose requirement<br />
H. Puehringer 1 , C. Stoellberger 2 , W. Krugluger 3 , C. Oberkanins 1 ;<br />
1 ViennaLab Diagnostics GmbH, Vienna, Austria, 2 Second Medical Department,<br />
Rudolfstiftung Hospital, Vienna, Austria, 3 Department of Clinical Chemistry,<br />
Rudolfstiftung Hospital, Vienna, Austria.<br />
Coumarin derivatives (Warfarin, Phenprocoumon, Acenocoumarol)<br />
are the most widespread oral anticoagulant drugs for the prevention<br />
and treatment of arterial and venous thromboembolic disorders. However,<br />
these vitamin K antagonists have a narrow therapeutic range and<br />
a wide inter-individual variability in dose requirement. Despite adjustment<br />
for clinical variables, adverse events, such as delay in achieving<br />
a stable maintenance dose or bleeding complications, are frequently<br />
encountered during the initial phase of therapy. Genetic polymorphisms<br />
in the drug-targeted vitamin K epoxide reductase complex 1