A genome wide SNP genotyping study in the Tunisian population: Specific reporting on a subset of common breast cancer risk loci

被引：11

作者：

Hamdi Y. ^{[1
]}

Ben Rekaya M. ^{[1
]}

Jingxuan S. ^{[2
]}

Nagara M. ^{[1
]}

Messaoud O. ^{[1
]}

Benammar Elgaaied A. ^{[3
]}

Mrad R. ^{[4
]}

Chouchane L. ^{[2
]}

Boubaker M.S. ^{[1
]}

Abdelhak S. ^{[1
]}

Boussen H. ^{[5
]}

Romdhane L. ^{[1
,6
]}

机构：

[1] Laboratory of Biomedical Genomics and Oncogenetics, Institut Pasteur de Tunis, Université Tunis El Manar, 13, Place Pasteur BP 74, Tunis, Belvédère

[2] Department of Genetic Medicine, Weill Cornell Medical College-Qatar, Doha

[3] Laboratory of Genetics, Immunology and Human Pathology, Department of Biology, Faculty of Sciences of Tunis, University of Tunis El Manar, Tunis

[4] Department of Human Genetics, Charles Nicolle Hospital, Tunis

[5] Medical Oncology Department, Abderrahmen Mami Hospital, Ariana

[6] Department of Biology, Faculty of Science of Bizerte, Université Tunis Carthage, Tunis

来源：

BMC Cancer | / 18卷 / 1期

关键词：

Breast cancer susceptibility; Functional analysis; Haplotype analysis; Population genetics;

D O I：

10.1186/s12885-018-5133-8

中图分类号：

学科分类号：

摘要：

Background: Breast cancer is the most common cancer in women worldwide. Around 50% of breast cancer familial risk has been so far explained by known susceptibility alleles with variable levels of risk and prevalence. The vast majority of these breast cancer associated variations reported to date are from populations of European ancestry. In spite of its heterogeneity and genetic wealth, North-African populations have not been studied by the HapMap and the 1000Genomes projects. Thus, very little is known about the genetic architecture of these populations. Methods: This study aimed to investigate a subset of common breast cancer loci in the general Tunisian population and to compare their genetic composition to those of other ethnic groups. We undertook a genome-wide haplotype study by genotyping 135 Tunisian subjects using the Affymetrix 6.0-Array. We compared Tunisian allele frequencies and linkage disequilibrium patterns to those of HapMap populations and we performed a comprehensive assessment of the functional effects of several selected variants. Results: Haplotype analyses showed that at risk haplotypes on 2p24, 4q21, 6q25, 9q31, 10q26, 11p15, 11q13 and 14q32 loci are considerably frequent in the Tunisian population (> 20%). Allele frequency comparison showed that the frequency of rs13329835 is significantly different between Tunisian and all other HapMap populations. LD-blocks and Principle Component Analysis revealed that the genetic characteristics of breast cancer variants in the Tunisian, and so probably the North-African populations, are more similar to those of Europeans than Africans. Using eQTl analysis, we characterized rs9911630 as the most strongly expression-associated SNP that seems to affect the expression levels of BRCA1 and two long non coding RNAs (NBR2 and LINC008854). Additional in-silico analysis also suggested a potential functional significance of this variant. Conclusions: We illustrated the utility of combining haplotype analysis in diverse ethnic groups with functional analysis to explore breast cancer genetic architecture in Tunisia. Results presented in this study provide the first report on a large number of common breast cancer genetic polymorphisms in the Tunisian population which may establish a baseline database to guide future association studies in North Africa. © 2018 The Author(s).

引用

共 80 条

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