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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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