Yazan: admin Tarih: Kas 30th, 2010 | Kategori::
polymorphisms
J Obstet Gynaecol Res. 2010 Aug;36(4):774-6.
Caglayan AO, Ozyazgan I, Demiryilmaz F, Ozgun MT.
Medical Genetics, Kayseri Education and Research Hospital, Erciyes University, Kayseri, Turkey. okaycaglayan@yahoo.com
Abstract
AIM: Recurrent miscarriage is a multifactorial problem associated with genetic abnormalities reflected by inherited disorders. The aim of the present study was to investigate the contribution of chromosomal abnormalities and the frequency of a particular type of aberration in couples of Turkish origin with recurrent miscarriages compared with patients without miscarriages.
METHODS: A total of 336 patients with recurrent miscarriages and 427 patients without miscarriages were analyzed.
RESULTS: In the recurrent miscarriage group, a structural chromosomal abnormality was found in four patients (1%). Twelve patients had mosaic karyotype (3%) and the total rate of chromosomal abnormalities was 4% in this group. The karyotypes were composed of polymorphisms in 8% of patients with recurrent miscarriages compared with 4% in the control group (P < 0.05).
CONCLUSION: The overall high incidence of chromosome polymorphisms in patients with recurrent miscarriages compared to the normal population needs to be confirmed with additional investigations including larger populations in order to delineate the role of ‘harmless’ chromosomal aberrations in the etiology of recurrent spontaneous abortions.
Yazan: admin Tarih: Nis 29th, 2009 | Kategori::
Kategorilenmemiş
Neuromolecular Med. 2009 Apr 19.
Department of Medical Biology, Faculty of Medicine, Suleyman Demirel University, 32260 Cunur, Isparta, Turkey, nilufersahin@yahoo.com.
Mutations in the ganglioside-induced differentiation-associated protein 1 gene (GDAP1) cause Charcot-Marie-Tooth type 2 (CMT2), a severe autosomal recessive form of neuropathy associated with axonal phenotypes. It has been screened in this study for the presence of mutations in the coding region of GDAP1, which maps to chromosome 8q21, in a family with CMT2. To date, 29 mutations in the GDAP1 have been reported in patients of different ethnic origins. Here, we report a novel missense mutation (c.836A>G), and two polymorphisms: a silent variant (c.102G>C), and a 5′-splice site mutation (IVS5+24C>T) in GDPA1 gene identified in a five generation Turkish family with autosomal recessive CMT2.
Yazan: admin Tarih: Ağu 3rd, 2008 | Kategori::
Breast cancer(Göğüs kanseri)
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Department of Medical Biology, Cerrahpasa Medical School, Istanbul University, Istanbul, Turkey.
INTRODUCTION: The biological significance of sequence variants in form of SNPs needs to be carefully evaluated, as conflicting associations with cancer predisposition have been reported. Haplotypes, the combination of closely linked alleles on a chromosome, play key roles in the study of the genetic basis of disease. There is strong evidence that different polymorphisms within a single gene in cis position can interact to create a large effect on the observed phenotype. Several polymorphisms have been reported in the p53 gene. Some of these are within the coding region and may affect the function of the p53 protein, others are within introns or non-coding regions, and their significance is unclear. In this study, we investigated the association of specific p53 genotypes and haplotypes with risk of breast cancer. METHODS: One hundred and fifteen patients with breast cancer and 63 healthy individuals were analyzed. DNA was isolated by salting out. The polymorphic sites were analyzed by PCR RFLP. Pearson’s chi(2) and Kolmogorof Simirnow tests were used for statistical analyses. Extended haplotype frequencies were estimated. RESULTS: The distribution of the genotypes was similar for all three polymorphisms in the cases and the controls. Our estimated haplotype results indicate that the intron 3 (+16bp)|exon 4 (Arg) diplotype and the intron 3 (+16bp)|exon 4 (Arg)|intron 6 (G) haplotype combinations are overrepresented in the breast cancer group, suggesting that the intron 3 (+16bp)|exon 4 (Arg) alleles may play a role in breast carcinogenesis. CONCLUSION: We conclude that two haplotypes harboring the intron 3 polymorphic (+16bp) allele are associated with a higher risk of breast cancer in the Turkish population.
Yazan: admin Tarih: Ağu 3rd, 2008 | Kategori::
Lung cancer (Akciğer Kanseri)
DNA Cell Biol. 2008 May 8.
Department of Medical Biology and Genetics, Faculty of Medicine, Gazi University, Besevler, Ankara, Turkey.
Lung cancer, a complex neoplasm of lung tissue, is influenced by several environmental and genetic factors which could be changed in each individual. Aurora-A gene is related to mitotic events such as: chromosome instability, cell cycle regulation, spindle formation, and kinetechore-microtubule connections. This centrosomic serine/threonine kinase provides a strong connection between mitotic errors and carcinogenesis. The genomic alterations such as single nucleotide polymorphisms (SNPs) can exist in molecular pathways of lung cancer. Therefore, we evaluated the role of genetic polymorphisms of Aurora-A gene in the lung cancer in the Turkish population. Genotypes of five Aurora-A polymorphisms (F31I, V57I, 6328G/A, P50L, and S104L) were determined in 102 healty controls and 102 new diagnosed lung cancer cases. All samples were genotyped with DNA sequence technique. There were not any genotype variations in P50L, S104L, and 6328G/A polymorphisms. The frequencies of both genotypes F31I and V57I in lung cancer patients were not significantly different from those in controls (p > 0.05). A multivariable logistic regression analysis with the involvement of patient characteristics, such as age and gender, did not change the results.
