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2009 Vienna - European Society of Human Genetics

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Evolutionary and population genetics, and Genetic epidemiology<br />

taset, analysis <strong>of</strong> ROH allows categorisation <strong>of</strong> individuals into four<br />

major groups, inferred to have (a) parental relatedness in the last 150<br />

years (many south and west Asians), (b) shared parental ancestry arising<br />

hundreds to thousands <strong>of</strong> years ago through population isolation<br />

and restricted effective population size (Ne), but little recent inbreeding<br />

(Oceanians, African hunter-gatherers, some <strong>European</strong> and south<br />

Asian isolates), (c) both ancient and recent parental relatedness (Native<br />

Americans), and (d) only the background level <strong>of</strong> shared ancestry<br />

relating to continental Ne (east Asians, urban <strong>European</strong>s; African agriculturalists).<br />

Long runs <strong>of</strong> homozygosity are therefore a widespread<br />

and underappreciated characteristic <strong>of</strong> our genomes which record past<br />

consanguinity and population isolation and provide a unique record <strong>of</strong><br />

individual demographic history. Individual ROH measures also allow<br />

quantification <strong>of</strong> the disease risk arising from polygenic recessive effects.<br />

We present preliminary data from a survey <strong>of</strong> the effects <strong>of</strong> ROH<br />

on quantitative disease-related traits and disease risk.<br />

P10.42<br />

Detection and quantitation <strong>of</strong> mu opioid receptor splice variants<br />

mRNA in peripheral blood lymphocytes <strong>of</strong> opioid addicts<br />

N. Vousooghi 1 , A. Goodarzi 2 , F. Roushanzamir 1 , T. Sedaghati 2 , M. Zarrindast 3 ,<br />

M. Noori-Daloii 4 ;<br />

1 Shahid Beheshti Medical University, Tehran, Islamic Republic <strong>of</strong> Iran, 2 Sina<br />

cellular and molecular research center, Tehran, Islamic Republic <strong>of</strong> Iran, 3 Institute<br />

for Cognitive Sciences Studies, Tehran, Islamic Republic <strong>of</strong> Iran, 4 Tehran<br />

University <strong>of</strong> Medical Sciences, Tehran, Islamic Republic <strong>of</strong> Iran.<br />

Aims: In the present study we have investigated the presence and<br />

changes <strong>of</strong> PBLs mRNA expression <strong>of</strong> four human mu opioid receptor<br />

splice variants (hMOR-1A, hMOR-1O, hMOR-1X, and hMOR-1Y) in<br />

the opioid addiction process to see whether they can serve as peripheral<br />

markers.<br />

Design: Splice variants mRNA expression in PBLs was detected and<br />

measured by real-time PCR using SYBR green dye.<br />

Participants: Four groups, each comprising <strong>of</strong> 30 male individuals were<br />

included: opioid addicts, methadone maintained patients, long-term<br />

abstinent former opioid addicts, and non-addicted control subjects.<br />

Findings: hMOR-1A and hMOR-1O are expressed in PBLs. However,<br />

we did not observe PBLs expression <strong>of</strong> hMOR-1X and hMOR-1Y. The<br />

hMOR-1A expression was reduced in abstinents (reaching 0.33 the<br />

amount <strong>of</strong> control group), up-regulated by the factor 1.94 in methadone<br />

maintained patients and not statistically different in addicted group in<br />

comparison to controls. The hMOR-1O expression was significantly<br />

reduced in abstinent and methadone maintained subjects reaching<br />

0.39 and 0.53 the amount <strong>of</strong> control group, respectively. However, addicted<br />

group was not statistically different from controls.<br />

Conclusions: Deficiency in expression <strong>of</strong> hMOR-1A and hMOR-1O<br />

splice variants measured by a suggested peripheral marker, may be a<br />

risk factor making individuals susceptible for drug addiction. This deficiency<br />

reaches to nearly normal levels in opioid addicts. However,<br />

from therapeutic point <strong>of</strong> view, we have no explanation for hMOR-1A<br />

mRNA up-regulation and hMOR-1O mRNA down-regulation in methadone<br />

maintained subjects at the moment.<br />

keywords: human, lymphocytes, mRNA expression, mu opioid receptor<br />

splice variants, opioids<br />

P10.43<br />

coevolution <strong>of</strong> the repeated glutamine and proline codons in the<br />

mammalian Huntington disease gene<br />

D. Savic-Pavicevic1 , D. Krndija2 , G. Brajuskovic1 , S. Romac1 ;<br />

1 2 Faculty <strong>of</strong> Biology, Belgrade, Serbia, Department <strong>of</strong> Internal Medicine I, Ulm,<br />

Germany.<br />

The human Huntington disease (HD) gene contains a CAG microsatellite<br />

encoding a polyglutamine tract, followed by cryptically simple regions<br />

encoding a proline reach region. The HD gene is evolutionary<br />

conserved between Drosophila and humans, but repeated CAG codons<br />

are seen only in the vertebrates, while repeated CGG codons are<br />

present only in the mammals. To improve understanding <strong>of</strong> the evolution<br />

<strong>of</strong> the HD gene repeated codons, we sequenced that part <strong>of</strong> the<br />

gene in 17 mammalian species. The analysis <strong>of</strong> the obtained nucleotide<br />

and supposed protein sequences, as well as database sequences<br />

<strong>of</strong> non-mammalian species, led to a model that predicts the coevolution<br />

<strong>of</strong> repeated glutamine and proline codons in the mammalian HD<br />

gene. The coevolution probably resulted from interplay between mu-<br />

tational processes, such as replication slippage and point mutations,<br />

and selection, such as purifying selection and selection on the reading<br />

frames in which tandemly repeated codons can accumulate. The<br />

balance between these processes significantly differ in two regions:<br />

replication slippage and strong purifying selection probably were the<br />

main force for the evolution <strong>of</strong> the repeated glutamine codons, while<br />

synonymous and non-synonymous point mutation and weaker purifying<br />

selection drove evolution <strong>of</strong> repeated proline codons. Analyzed<br />

region <strong>of</strong> the HD gene is an example for rapid evolutionary change in<br />

an evolutionary ancient gene, leading to crating homopeptide regions,<br />

which could assign huntigtin protein with some new functions.<br />

P10.44<br />

the estimation the age <strong>of</strong> the founder mutation causing<br />

autosomal recessive hypotrichosis in chuvash and mari<br />

Republics <strong>of</strong> Russia<br />

E. A. Bliznetz 1 , N. N. Vasserman 1 , R. A. Zinchenko 1 , E. I. Rogaev 2 , A. V.<br />

Polyakov 1 ;<br />

1 Research Centre for Medical <strong>Genetics</strong>, Moscow, Russian Federation, 2 Brudnick<br />

Neuropsychiatric Research Institute, Department <strong>of</strong> Psychiatry, University<br />

<strong>of</strong> Massachusetts Medical School, Worcester, MA, United States.<br />

Chuvash and Mari populations <strong>of</strong> Russia is <strong>of</strong> great interest, as three<br />

endemic autosomal recessive diseases has been recorded with high<br />

frequency in these regions: erythrocytosis (OMIM#263400), osteopetrosis<br />

(OMIM#259700), and hypotrichosis (OMIM#604379). The presence<br />

<strong>of</strong> such genetic differentiation in the populations presumably results<br />

from the long reproductive isolation <strong>of</strong> the populations and the<br />

genetic drift. It was established the founder mutations caused this conditions<br />

- Arg200Trp in VHL gene, c.807+5G>A in TCIRG1 gene and ex<br />

4 del in LIPH gene correspondingly. Recently, the age <strong>of</strong> the mutation<br />

for erythrocytosis and osteopetrosis in Chuvashians calculated and<br />

was average 1,250 and 890 years.<br />

In this work to estimate the age <strong>of</strong> the founder mutation for hypotrichosis<br />

in Chuvash and Mari populations we were analyze five microsatellite<br />

markers (D3S3730, D3S3609, D3S3592, D3S1262 and D3S3600)<br />

flanking the LIPH gene in 18 Chuvash and 20 Mari chromosomes<br />

bearing the mutation and in populations chromosomes (74 and 86).<br />

The mutation was associated with D3S3609, D3S3592 and D3S1262<br />

in Chuvasians and with D3S3609 and D3S3592 in Marians. The mean<br />

age was equal to 26.3 generations for Chuvashians and 35.67 generations<br />

for Marians, i.e. ~ 720 and 1070 years. These results assume<br />

that bottle neck was 700 - 1000 years ago in these regions.<br />

P10.45<br />

the Linkage Disequilibrium Pattern <strong>of</strong> IGF- Promoter<br />

Polymorphism<br />

Y. Chen 1 , W. Huang 1 , H. K. V. Leung 1 , L. S. N. Tang 1,2 ;<br />

1 Department <strong>of</strong> Chemical Pathology, Shatin, Hong Kong, 2 Laboratory <strong>of</strong> <strong>Genetics</strong><br />

<strong>of</strong> Disease Susceptibility,Li Ka Shing Institute <strong>of</strong> Health Sciences, Shatin,<br />

Hong Kong.<br />

Introduction: Insulin-like growth factor-I (IGF-I) is a strong risk factor <strong>of</strong><br />

various cancers including colon cancer, prostate cancer and premenopausal<br />

breast cancer. Some studies suggested that the length <strong>of</strong> a cytosine-adenine<br />

(CA)n repeat polymorphism located in the promoter 1<br />

region 970bp upstream <strong>of</strong> transcription start site (TSS) <strong>of</strong> IGF-I gene is<br />

proportional to the IGF-I expression, while some others failed to reproduce<br />

this relationship. Therefore, we hypothesized that there may be<br />

some other genetic variations in the IGF-I promoter region contributing<br />

to the high activity <strong>of</strong> IGF-I other than the -970 CA microsatellite repeat.<br />

The objective <strong>of</strong> this study was to define the relevant haplotypes<br />

<strong>of</strong> IGF-I promoter in the Chinese population.<br />

Methods and results: One hundred and sixty male Chinese subjects<br />

participated in this study. Three identified SNPs (-603 T/A, -705 T/C,<br />

-1410 T/C) and the -970 CA microsatellite repeat in the IGF-I promoter<br />

1 were selected and genotyped by restriction fragment length polymorphism<br />

(RFLP). The results showed that three haplotypes, C-18-TT,<br />

C-19-TT, and T-21-CA, are prevalent, and they account for almost 80%<br />

<strong>of</strong> genotypes in the Chinese population.<br />

Conclusion: The haplotype pattern, together with the CA microsatellite<br />

repeat number, may be a biomarker for various cancers in the Chinese<br />

population. Additional studies are needed to investigate the different<br />

transactivation activity <strong>of</strong> the prevalent haplotypes in the Chinese<br />

population.

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