2009 Vienna - European Society of Human Genetics
2009 Vienna - European Society of Human Genetics
2009 Vienna - European Society of Human Genetics
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Cancer genetics<br />
screening was performed using denaturing high performance liquid<br />
chromatography (dHPLC) or high resolution melting (HRM). Samples<br />
showing unique pr<strong>of</strong>iles were sequenced.<br />
We detected 2 patients with biallelic mutation in MUTYH and 6 patients<br />
with monoallelic MUTYH mutation. Now we have started to test the<br />
presence <strong>of</strong> MSH6 mutation in carriers <strong>of</strong> monoallelic MUTYH mutation.<br />
Supported by the VZ MSM0021620808 <strong>of</strong> the Czech Republic.<br />
P06.164<br />
Breakpoint identification <strong>of</strong> large STK11 germline deletions in<br />
Peutz-Jeghers syndrome patients using fine-tiling CGH arrays<br />
M. Plasilova 1 , B. Röthlisberger 2 , A. R. Huber 2 , K. Heinimann 1 ;<br />
1 Research Group <strong>Human</strong> <strong>Genetics</strong>, Division <strong>of</strong> Medical <strong>Genetics</strong> UKBB, Department<br />
<strong>of</strong> Biomedicine, University <strong>of</strong> Basel, Basel, Switzerland, 2 Center <strong>of</strong><br />
Laboratory Medicine, Canton Hospital, Aarau, Switzerland.<br />
Peutz-Jeghers syndrome (PJS) is an autosomal dominantly inherited<br />
cancer predisposition syndrome characterized by the presence <strong>of</strong> hamartomatous<br />
polyps, mucocutaneous pigmentation, and an increased<br />
risk for malignancies <strong>of</strong> the colorectum, stomach, pancreas, breast,<br />
and ovaries. It is caused by germline mutations in the serine/threonine<br />
protein kinase 11 (STK11, also called LKB1) tumour suppressor<br />
gene. Germline STK11 mutations can be identified in 80 to 94% <strong>of</strong> PJS<br />
patients when combining a screening for point mutations and large<br />
deletions using direct sequencing and multiplex ligation-dependent<br />
probe amplification (MLPA), respectively. With the aim to identify large<br />
STK11 deletions and simultaneously delineate the breakpoints with<br />
high precision (approx. 100-200bp), we designed a custom fine-tiling<br />
CGH array with a median probe spacing <strong>of</strong> 10bp covering the entire<br />
STK11 gene including 135 kb <strong>of</strong> genomic sequence up- and downstream<br />
<strong>of</strong> the gene, and applied the technique on 5 SKT11 deletion<br />
carriers previously identified by MLPA as well as on 2 mutation-negative<br />
PJS patients. We will report on the overall accuracy <strong>of</strong> the finetiling<br />
CGH array in fine-mapping the breakpoints and thus enabling<br />
cost- and time-saving carrier screening <strong>of</strong> at risk-family members by<br />
subsequent PCR-based fragment length analysis/direct sequencing.<br />
P06.165<br />
Germline mutations <strong>of</strong> the STK gene and clinical findings in<br />
czech Peutz-Jeghers families<br />
P. Vasovcak 1 , A. Puchmajerova 1 , P. Plevova 2 , J. Roubalik 3 , A. Krepelova 1 ;<br />
1 Department <strong>of</strong> Biology and Medical <strong>Genetics</strong>, Charles University 2nd Medical<br />
School and University Hospital Motol, Praha, Czech Republic, 2 Department <strong>of</strong><br />
Medical <strong>Genetics</strong>, Faculty Hospital, Ostrava, Czech Republic, 3 Digestive endoscopy<br />
Centre, Bata Hospital, Zlin, Czech Republic.<br />
Peutz-Jeghers syndrome (PJS) is an autosomal dominant inherited<br />
disorder characterized by mucocutaneous hyperpigmentation and gastrointestinal<br />
hamartomatous polyposis. PJS patients have increased<br />
risk <strong>of</strong> developing cancer over the general population, predominantly<br />
in gastrointestinal tract. Germline mutations in the serine/threonine<br />
kinase 11 (STK11) gene have been found to be responsible for the<br />
disease. Here we report clinical findings and molecular analysis <strong>of</strong> 9 individuals<br />
from 6 Czech families. We analyzed promotor and the entire<br />
coding region including the splice-site boundaries <strong>of</strong> the STK11 gene<br />
in genomic DNA <strong>of</strong> the probands by sequencing analysis and multiplex<br />
ligation probe-dependent amplification (MLPA) assay. By direct<br />
sequencing <strong>of</strong> the STK11 gene, we identified two frameshift mutations<br />
(c.350dupT and c.589_597+2del11) in 3 individuals from two families.<br />
The remaining 6 patients were examined by MLPA method and 4 patients<br />
from two families harboured large deletions (c.-277-?_290+?del<br />
and c.-1114-?_1365+?del). No mutation was identified in two patients<br />
with sporadic disease. In conclusion, we found germline mutations in<br />
five familial and two sporadic cases. One patient with frameshift mutation<br />
(c.350dupT) and severe phenotype died due to gastric cancer at<br />
her 29, the other probands were without any malignancy up to date.<br />
This is the first report dealing with PJS patients in Czech Republic.<br />
Grant support: VZ MZO 00064203<br />
P06.166<br />
interphase FisH detection <strong>of</strong> prognostically important<br />
chromosomal aberrations in B-cLL<br />
V. Holubova1 , M. Stoklasova1 , J. Sobotka1 , M. Brejcha1 , J. Gumulec2 , D.<br />
Adamova3 , S. Blahutova3 , C. Bodzasova2 , E. Bogoczova4 , V. Heinzova3 , D.<br />
Janek5 , Z. Jehlikova6 , D. Klodova1 , I. Krajsova7 , J. Laska8 , N. Petricova9 , N.<br />
Rytikova9 , M. Urbankova6 , M. Wrobel1 , J. Zivna10 , M. Radina1 ;<br />
1 2 Mendel Cancer Center, Novy Jicin, Czech Republic, Faculty Hospital Ostrava,<br />
Czech Republic, 3Silesian Hospital in Opava, Czech Republic, 4Hospital Vitkovice<br />
- Ostrava, Czech Republic, 5Hospital Karvina-Raj, Czech Republic, 6Hos pital Sumperk Inc., Czech Republic, 7Hospital Bruntal Inc., Czech Republic,<br />
8 9 Hospital Cesky Tesin Inc., Czech Republic, Hospital Krnov, Czech Republic,<br />
10Hospital Hranice Inc., Czech Republic.<br />
Chromosomal aberrations are independent prognostic factors in Bcell<br />
chronic lymphocytic leukemia (B-CLL). Cytogenetic abnormalities<br />
identify groups <strong>of</strong> patients with different time to progression and overal<br />
survival.<br />
There are two main risk groups recognized. Low-risk patients with normal<br />
karyotype or 13q deletion as a sole abnormality have excellent<br />
prognosis. High-risk patients with 11q deletion and particularly 17p<br />
deletion do not respond to conventional therapy and tend to have a<br />
rapidly evolving disease. Prognosis <strong>of</strong> patients with trisomy 12 is intermediated.<br />
Interphase fluorescence in situ hybridization (I-FISH) is currently preferred<br />
molecular-cytogenetic method for identification <strong>of</strong> the chromosome<br />
aberrations in B-CLL.<br />
The aim <strong>of</strong> this study was the detection <strong>of</strong> prognostically important<br />
chromosomal aberrations in B-CLL patients and comparison <strong>of</strong> their<br />
prognostic significance with the other biological and clinical factors.<br />
We performed I-FISH analysis using a DNA probe set to detect deletions<br />
17p, 11q, 13q, trisomy 12 and translocations involving 14q32 on<br />
bone marrow and peripheral blood samples <strong>of</strong> 480 B-CLL patients.<br />
Chromosomal aberrations analyzed by I-FISH were found in 73% <strong>of</strong><br />
patients including 54% with single aberration, 17% with two and 2%<br />
with three or more aberrations. The most frequent aberration was<br />
13q14 deletion found in 39% <strong>of</strong> patients, followed by 11q23 deletion in<br />
12%, trisomy 12 in 11%, and 17p13 deletion in 9% <strong>of</strong> patients. Rearrangement<br />
involving 14q32 was found in 1% <strong>of</strong> patients. Correlations<br />
<strong>of</strong> I-FISH results and some clinical and laboratory findings will be presented.<br />
P06.167<br />
Array CGH identifies potential candidate genes in AML without<br />
recurrent molecular and cytogenetic aberrations<br />
S. Breitenfellner1 , R. Marschon1 , W. Kranewitter1 , G. Tschurtschenthaler1 , H.<br />
Duba2 , G. Webersinke1 ;<br />
1 2 Hospital Barmherzige Schwestern, Linz, Austria, General Women´s and<br />
children´s Hospital, Linz, Austria.<br />
Introduction: Chromosomal and molecular aberrations are an integral<br />
part <strong>of</strong> AML classification and influence prognosis and therapy. Nevertheless<br />
AML with none <strong>of</strong> the classical genetic changes do exist and<br />
one can assume other genetic events in these cases leading to different<br />
expression <strong>of</strong> the disease. Therefore we analyzed AML without<br />
recurrent aberrations for possible candidate genes by array CGH.<br />
Methods: Bone marrow from cytological and immunophenotypical<br />
confirmed AML patients was analyzed by conventional cytogenetics<br />
(GTG-Banding), FISH and PCR methods for typical aberrations indicated<br />
by WHO. DNA from inconspicuous samples was hybridized on<br />
Affymetrix SNP 6.0 Arrays featuring 1.8 million markers, SNPs and<br />
CNVs (copy number variations), one half each. The majority <strong>of</strong> gains<br />
and losses detected by Affymetrix genotyping console 3.0 were CNVs<br />
and excluded in our study.<br />
Results: About two thirds <strong>of</strong> the AML samples show at least one domain<br />
carrying a potential tumor associated gene. These include, for<br />
example, ZBTB16, IL1R2 or EPS8, which are important for regulation<br />
<strong>of</strong> apoptosis, cell cycle progression, and signal transduction. Chromosomal<br />
changes leading to the deregulation <strong>of</strong> the involved pathways<br />
may potentially be causative for the development <strong>of</strong> AML.<br />
Conclusions: Array CGH seems to be a potent method for the identification<br />
<strong>of</strong> new candidate genes in AML without recurrent cytogenetic<br />
and molecular aberrations.<br />
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