Publications by authors named "Halit Akbas"

15 Publications

  • Page 1 of 1

Melatonin Receptor Gene Polymorphism in Bipolar-I Disorder.

Arch Med Res 2021 Feb 2. Epub 2021 Feb 2.

University of Texas System: Houston, TX, US.

Background And Aim: In patients with Bipolar-I Disorder (BD-I), circadian rhythm and sleep disorders are frequently observed. Melatonin is a main regulatory hormone for the circadian rhythm. Certain studies have shown the relationship of melatonin receptor gene polymorphism with psychiatric diseases. In this study, it was aimed to investigate the relationship between BD-I and -184T>C (rs2119882) polymorphism in melatonin receptor 1A (MTNR1A) gene and -1193C>T (rs4753426) polymorphism in melatonin receptor 1B (MTNR1B) gene.

Methods: The study included 108 patients diagnosed with BD-I and 95 healthy people as the control group. Real-time PCR (RT-PCR) method was used to evaluate the polymorphism of MTNR1A gene-184T>C. Genotyping of MTNR1B gene-1193C>T polymorphism was done by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP).

Results: In terms of MTNR1B gene-1193C>T polymorphism, homozygous CC genotype was found to be increased in BD-I patient group compared to the control group (p <0.05). Similarly, a statistically significant difference was found between the patients and the control group in terms of allele frequencies too (p <0.05). However, no relation between BD-I and MTNR1A gene-184T>C polymorphism was found (p >0.05).

Conclusion: The results of the study revealed that MTNR1B gene-1193C>T polymorphism may play a role in BD-I genetic etiology and may be among the causes of sleep disorder and circadian rhythm disorder seen in these patients.
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http://dx.doi.org/10.1016/j.arcmed.2021.01.002DOI Listing
February 2021

The role of serum E-selectin level and E-selectin gene S128R polymorphism on the enlargement of renal cyst in patients with polycystic kidney disease: Genetic background of renal cyst growth
.

Clin Nephrol 2020 Jan;93(1):34-49

Background: To determine the role of E-selectin gene S128R polymorphism on the enlargement of renal cysts in patients with polycystic kidney disease (PKD).

Materials And Methods: 76 PKD patients with no comorbidity were enrolled in the study. Serum E-selectin levels were analyzed by enzyme-linked immunoabsorbent assay (ELISA). E-selectin gene S128R (561 A>C, rs: 5361) polymorphism was examined by polymerase chain reaction restriction fragment length (PCR-RFLP). Magnetic resonance imaging was performed at baseline evaluation and at the end of the 1 year to determine cyst enlargement and total kidney volume (TKV).

Results: No significant difference was identified between AA genotype and AC or CC variants of E-selectin gene S128R polymorphism in terms of age, disease duration, baseline cyst volume, cyst volume at the 12 month, baseline dominant cyst volume, and dominant cyst volume at the 12 month. In contrast, a significant difference was determined between the groups with regard to the change of TKV (2.9 ± 13.4 vs. 5.2 ± 16.3 mm; respectively, p = 0.01). In the correlation analysis, the serum E-selectin level was significantly correlated to glucose, alanine transaminase, creatinine, calcium, phosphorus, total protein, albumin, and end diastolic volume (p = 0.0001, p = 0.001, p = 0.03, p = 0.021, p = 0.023, p = 0.002, p = 0.003, and p = 0.047, respectively). Multivariate logistic regression analysis demonstrated a 1.32-fold higher risk of cyst enlargement in patients with CC polymorphism when compared to AA genotype (p = 0.052), but not between AA and AC genotypes or CC and AC genotypes.

Conclusion: PKD patients with CC variants of the E-selectin gene S128R polymorphism are at greater risk of cyst enlargement. The results of the present study should be confirmed with further studies with large sample size and longer duration of follow-up.
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http://dx.doi.org/10.5414/CN109750DOI Listing
January 2020

Minor variant of AHSG gene 767C>G polymorphism may decrease the risk of gestational diabetes mellitus.

J Obstet Gynaecol 2020 Apr 24;40(3):303-307. Epub 2019 Jul 24.

Department of Medical Biology, Faculty of Medicine, Harran University, Sanliurfa, Turkey.

Insulin resistance plays a central role in the development of gestational diabetes mellitus (GDM). The fetuin A molecule, of which serum level increases during pregnancy, is an inhibitor of insulin receptor tyrosine kinase and it is associated with insulin resistance. The aim of this study is to research the relationship of -843A>T (rs2248690) and 767C>G (rs4918) polymorphisms in the alpha-2-Heremans Schmid glycoprotein (AHSG) gene which is responsible for the synthesis of fetuin A and its association with (GDM). In this study, 83 pregnant women with GDM who applied to the Obstetrics and Gynaecology Clinics and 100 normal pregnants enrolled as the control group. Genotyping of AHSG gene polymorphisms was performed by using the TaqMan allelic discrimination kit with real time PCR device. In our study, homozygous GG genotype which was polymorphic in the 767C>G polymorphism of AHSG gene was found significantly low in the patient group ( < .05). Genotype distribution of AHSG gene -843A>T polymorphism was not statistically significant between the patient and control groups ( > .05). Our results showed that homozygous GG variant of AHSG gene 767C>G polymorphism may have protective effect against the development of GDM.Impact statement Insulin resistance has a central role in the development of gestational diabetes mellitus (GDM). The fetuin A molecule is an inhibitor of insulin receptor tyrosine kinase and it is associated with insulin resistance. The -843T>A and 767G>C polymorphisms of AHSG gene encoding fetuin A are affects serum fetuin A level. In a single study investigating the relationship between GDM and AHSG gene 767G>C polymorphism, there was no significant difference in genotype distribution but it was reported that the frequency of G allele increased in GDM group and this increase provided a weak risk or predisposition. The present study revealed that homozygous GG variant of AHSG gene 767C>G polymorphism may decrease the risk of GDM. Protective effect of homozygous GG variant of AHSG gene 767C>G polymorphism, can be used as a molecular biomarker to predict the development of GDM. These results should be supported by further research in larger sample sizes.
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http://dx.doi.org/10.1080/01443615.2019.1621810DOI Listing
April 2020

The Possible Role of XRCC1 Gene Polymorphisms with Idiopathic Non-obstructive Azoospermia in Southeast Turkey.

Urol J 2019 08 18;16(4):380-385. Epub 2019 Aug 18.

Department of Urology, Faculty of Medicine, Dicle University, Diyarbakır, Turkey.

Purpose: X-ray repair cross-complementing group 1 (XRCC1) plays a role in repairing DNA damage during spermatogenesis. We examined the effects the possible role of two single nucleotide polymorphisms of XRCC1 Arg194Trp and Arg399Gln in DNA repair gene XRCC1 with risk of idiopathic non-obstructive azoospermia (INOA) in a south-east Turkey population.

Materials And Methods: The genotype and allele frequencies of two observed polymorphisms of XRCC1 Arg194Trp and Arg399Gln were examined by polymerase chain reaction-restriction fragment length polymorphism in 102 infertile men with INOA and 102 fertile controls.

Results: In our study, all the observed genotype frequencies are in agreement with Hardy-Weinberg equilibrium. The genotype frequencies of the XRCC Arg194Trp were 84% (CC), 16% (CT) and 2% (TT) among the men with INOA, while the frequencies of those genotypes in the controls were found to be 88% (CC), 12% (CT) and 2% (TT) (?2 test: P < .05). Similarly, the genotypes frequencies of GG, GA, and AA of the XRCC1 Arg399Gln were 44%, 39%, and 19% in the group of men with INOA, whereas these frequencies were 42%, 45%, and 15% in the control group, respectively. No significant difference between the control group and the men with INOA were found in the frequencies of genotypes and allele of XRCC1 Arg194Trp and Arg399Gln (P > 0.05).

Conclusion: Neither Arg194Trp nor Arg399Gln polymorphisms in the XRCC1 gene influenced risk of INOA in our study. However, these findings may be helpful in improving the understanding of the etiology of male infertility.
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http://dx.doi.org/10.22037/uj.v0i0.4435DOI Listing
August 2019

Cytogenetic screening in couples with Habitual Abortions.

J Gynecol Obstet Hum Reprod 2019 Mar 6;48(3):155-158. Epub 2018 Nov 6.

Harran University, Faculty of Medicine, Department of Obstetrics and Gynecology, Sanliurfa, Turkey.

Objective: Habitual abortion (HA) is defined at least three consecutive pregnancy losses. One of the etiologic causes is parental chromosomal anomalies. In this study, we aimed to that investigate the effect of parental chromosomal abnormalities on HA.

Methods: The cytogenetic results of patients with at least three abortions referred to our university hospital between January 2010 - March 2017 were evaluated. A total of 1154 couples with HA were analysed. Peripheral lymphocyte cultures incubated for 72 h were used for karyotype analysis via the Giemsa banding technique.

Results: Of a total 1154 couples (2308 patients) 37 female (3.2%) and 17 male (1.47%) had abnormal karyotypes. Reciprocal translocation carriage (n = 26; 1.12%) was the most commonly detected structural anomaly, followed by X chromosome mosaicism (n = 16; 0.69%),Robertsoniantranslocation (n = 9; 0.38%), Chromosomal inversion (n = 6; 0.26%). Chromosomal polymorphisms, which are considered minor chromosomal changes, were detected in 221 (9.57%) individuals.

Conclusion: Our study exhibits that chromosomal analysis in patient with HA is an appropriate approach to elucidate the aetiology of HA. Data from cytogenetic screening can be used in guiding couples planning future pregnancies and in prenatal diagnosis of chromosomal anomalies in the foetus.
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http://dx.doi.org/10.1016/j.jogoh.2018.10.021DOI Listing
March 2019

miRNA-mediated apoptosis activation through TMEM 48 inhibition in A549 cell line.

Biochem Biophys Res Commun 2018 09 14;503(1):323-329. Epub 2018 Jun 14.

Faculty of Medicine, Department of Medical Biology, Harran University, Sanliurfa, Turkey. Electronic address:

Lung has critic function in gas exchange, supplying oxygen to all cells. Rapid metastasis and the high rate of mortality characterises lung cancer. There are two types of this disease, small cell and non-small cell, which differs from each other according to histopathologic features. To date, many therapeutic approaches have been developed to destroy this deadly type of cancer, which one of them is mRNA targeted therapies through miRNA. miRNAs are 19-25 base paired molecules be able to suppress and destruct mRNA and found to be involved in development and progression of lung cancer. Transmembrane Protein 48 (TMEM48) is localised on nuclear pore complex and plays critic roles in nuclear traffic. Known that TMEM48 gene overexpressed in non-small lung cancer cells. Growing TMEM48 suppressed therapeutic studies indicated that decreased TMEM48 level might reveal a therapeutic effect for non-small cell lung cancers. TMEM48 studies based on the same strategy of gene-silencing, however, to our knowledge, any report has been published evaluates TMEM48's regulation by miRNAs. We aimed to clarify if miR-421 might be therapeutic player for non-small cancer cell lines (A549), hereby we suppressed TMEM48 by miR-421 and performed advanced molecular tests. Consequently, we recorded that while miR-421 is significantly suppressing TMEM48 expression; it increased apoptotic and tumor suppressor players CASPASE 3, PTEN and TP53 in A549 line, which is consistent with Annexin V - PI results: 30,6% of A549 observed to be apoptotic - 68,5% of A549 was in GO/G1. Our study indicated that miR-421 can suppress TMEM48 so that leads the cells to apoptosis. But it is not entirely clear how miR-421 triggers apoptosis and whether it interacts with the other cellular death pathways in A549.
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http://dx.doi.org/10.1016/j.bbrc.2018.06.023DOI Listing
September 2018

Serum ICAM-1 level and ICAM-1 gene 1462A>G (K469E) polimorphism on microalbuminuria in nondiabetic, nonhypertensive and normolipidemic obese patients: Genetical background of microalbuminuria in obesity.

Nefrologia 2017 Jul - Aug;37(4):381-388. Epub 2017 May 30.

Department of Endocrinology and Metabolism, Marmara University School of Medicine, Istanbul, Turkey.

Background: A growing body of evidence suggest that obese individuals are under risk of renal parenchymal disorders when compared to nonobese counterparts. Microalbuminuria is the early marker of renal involvement. Although most of obese patients carries multiple risk factors for microalbuminuria, some obese individuals without risk factor may progress to microalbuminuria. The present study was performed to examine the role of ICAM-1 gene 1462A>G (K469E) polymorphism on microalbuminuria in obese subjects without diabetes mellitus, hypertension, hiperlipidemia and older age.

Methods: Ninety eight obese and 96 nonobese individuals without a comorbidity enrolled into the study. Serum ICAM-1 level was measured by enzyme linked immunoabsorbent assay (ELISA) method. ICAM-1 gene 1462A>G (K469E) polymorphism was examined by restriction fragment length polymorphism-polymerase chain reaction (RFLP-PCR). Nepholometric method was used to examine urinary albumin loss, and microalbuminuria was measured by albumin to creatinine ratio.

Results: Obese individuals had significantly higher microalbuminuria and proteinuria level compared to nonobese subjects (p: 0.043 and p: 0.011; respectively). GG genotype of ICAM-1 carriers have significantly higher microalbuminuria compared to individuals with AA or AG genotype carriers (p: 0.042). Serum ICAM-1 level was significantly correlated with creatinine and microalbuminuria (p: 0.002 and p: 0.03; respectively). Logistic regression analysis indicated a 7.39 fold increased risk of microalbuminuria in individuals with GG genotype of ICAM-1 gene 1462A>G (K469E) polymorphism.

Conclusions: GG genotype of ICAM-1 gene K469E polymorphism is associated with increased microalbuminuria in obese individuals without another metabolic risk factor.
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http://dx.doi.org/10.1016/j.nefro.2016.11.025DOI Listing
May 2017

Prevalence of thromogenic gene mutations in women with recurrent miscarriage: A retrospective study of 1,507 patients.

Obstet Gynecol Sci 2014 Nov 20;57(6):513-7. Epub 2014 Nov 20.

Department of Gynecology and Obstetrics, Harran University Faculty of Medicine, Sanliurfa, Turkey.

Objective: Thromogenic gene mutations has been thought to be associated with recurrent pregnancy loss in women in Turkey. The aim of this study was to investigate the prevalence of thromogenic gene mutations such as factor V Leiden (FVL, G1691T), prothrombin (G20210A), and the methylene tetrahydrofolate reductase (MTHFR, C677T) mutation in women with recurrent pregnancy loss.

Methods: This descriptive study was carried out in the Department of Obstetrics and Gynaecology, Harran University School of Medicine, and included a total of 1,507 women with histories of recurrent pregnancy loss between January 2010 and June 2013. The mutations were assessed by using the polymerase chain reaction.

Results: The homozygous mutation frequencies of FVL, prothrombin, and MTHFR were found to be 3 (0.20%), 0 and 125 (8.29%), and the heterozygous mutation frequencies were 83 (5.51%), 61 (4.05%), and 612 (40.61%), respectively. Among the 86 FVL mutation patients, 38 also had accompanying prothrombin and MTHFR mutations.

Conclusion: Since the homozygous forms of the FVL-prothrombin gene mutations have low incidences and MTHFR mutation is similar to a healthy population, preconceptional thromogenic gene mutations screening seems to be controversial.
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http://dx.doi.org/10.5468/ogs.2014.57.6.513DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4245346PMC
November 2014

Lack of Association between PTPN22 Gene +1858 C>T Polymorphism and Susceptibility to Generalized Vitiligo in a Turkish Population.

Ann Dermatol 2014 Feb 17;26(1):88-91. Epub 2014 Feb 17.

Department of Internal Medicine, Bagcilar Education and Research, İstanbul, Turkey.

Background: Vitiligo is an autoimmune polygenic disorder characterized by loss of pigmentation due to melanocyte destruction. The PTPN22 gene +1858 C>T single nucleotide polymorphism (rs2476601) has been shown to be associated with various autoimmune disorders.

Objective: The aim of this study was to investigate whether the PTPN22 gene +1858 C>T single nucleotide polymorphism is associated with susceptibility to generalized vitiligo in a Turkish population.

Methods: One hundred and seven patients with generalized vitiligo, and one hundred and twelve gender-, age-, and ethnic-matched controls were enrolled in the study. Genotyping was done by polymerase chain reaction-restriction fragment length polymorphism.

Results: The PTPN22 +1858 C>T genotype and allele frequencies of the generalized vitiligo patients did not differ significantly from those of healthy controls.

Conclusion: We found no association between the PTPN22 +1858 C>T gene polymorphism and vitiligo susceptibility in Turkish generalized-vitiligo patients.
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http://dx.doi.org/10.5021/ad.2014.26.1.88DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3956800PMC
February 2014

Prenatal diagnosis of 4p and 4q subtelomeric microdeletion in de novo ring chromosome 4.

Case Rep Obstet Gynecol 2013 19;2013:248050. Epub 2013 Dec 19.

Department of Medical Biology and Genetics, Faculty of Medicine, Dicle University, 21280 Diyarbakir, Turkey.

Ring chromosomes are unusual abnormalities that are observed in prenatal diagnosis. A 23-year-old patient (gravida 1, para 0) referred for amniocentesis due to abnormal maternal serum screening result in the 16th week of second pregnancy. Cytogenetic analysis of cultured amniyotic fluid cells revealed out ring chromosome 4. Both maternal and paternal karyotypes were normal. Terminal deletion was observed in both 4p and 4q arms of ring chromosome 4 by fluorescence in situ hybridization (FISH). However deletion was not observed in the WHS critical region of both normal and ring chromosome 4 by an additional FISH study. These results were confirmed by means of array-CGH showing terminal deletions on 4p16.3 (130 kb) and 4q35.2 (2.449 Mb). In the 21th week of pregnancy, no gross anomalia, except two weeks symmetric growth retardation, was present in the fetal ultrasonographic examination. According to our review of literature, this is the first prenatal case with 4p and 4q subtelomeric deletion of ring chromosome 4 without the involvement of WHS critical region. Our report describes the prenatal case with a ring chromosome 4 abnormality completely characterized by array-CGH which provided complementary data for genetic counseling of prenatal diagnosis.
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http://dx.doi.org/10.1155/2013/248050DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3880738PMC
January 2014

The association of endothelial nitric oxide synthase gene G894T polymorphism and serum nitric oxide concentration with microalbuminuria in patients with gestational diabetes.

Clin Nephrol 2014 Feb;81(2):105-11

Department of Internal Medicine, Bagcılar Education and Research Hospital, Istanbul, Department of Medical Biology, Medical School of Harran University, Sanlıurfa, Department of Physiology, Medical School of Mustafa Kemal University, Hatay, Department of Obstetrics and Gynecology, Suleymaniye Education and Research Hospital, Istanbul, Department of Obstetrics and Gynecology, Medical Faculty of Harran University, Sanlıurfa, and Department of Medical Biology and Genetics, Medical Faculty of Dicle University, Diyarbakir, Turkey.

Aim: Gestational diabetes mellitus (GDM) is a glucose intolerant condition that affects 14% of all pregnancies. Diabetes mellitus (DM) occurs in 30 - 70% of patients with GDM after delivery. DM and GDM are associated with structural and functional deterioration of the renovascular system. Our aim is to investigate the association Glu- 298Asp polymorphism of the endothelial nitric oxide synthase (eNOS) gene with serum nitric oxide levels and microalbuminuria in patients with GDM and healthy pregnancies.

Material And Methods: Serum nitric oxide (NO) levels, urinary excretion of albumin and Glu298Asp polymorphism of the eNOS gene were analyzed in 68 patients with GDM and 73 healthy controls. High performance liquid chromatography (HPLC-Griess) method was used to analyze serum NO levels. Microalbuminuria was evaluated by rate nephelometry method. The Glu298Asp polymorphism of the eNOS gene was determined by polymerase chain reaction and restriction fragment length polymorphism (PCR-RFLP).

Results: Nitric oxide, glucose, creatinine, and microalbuminuria were significantly different between the patients and the control subjects (p = 0.001, p = 0.001, p = 0.002, and p = 0.005, respectively). There was a significant difference between groups in terms of the ratio of GG/GT+TT of eNOS gene Glu- 298Asp (p = 0.02). The patients with GT+TT genotype had significantly higher microalbuminuria levels and lower NO concentrations (22.16 vs. 9.51, p = 0.005, and 10.56 vs. 12.73, p = 0.021, respectively). The presence of T allele of eNOS gene is an independent predictor of microalbuminuria (OR: 2.346, 95% confidence interval: 1.247 - 5.238, p = 0.02) as well as serum glucose and NO concentration.

Conclusion: The G894T polymorphism of eNOS gene and decreased NO concentration seem to be independent predictors of increased urinary excretion of albumin in patients with GDM. Determining the frequency of eNOS gene G894T polymorphism may help to identify pregnancies at increased risk of microalbuminuria.
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http://dx.doi.org/10.5414/cn108138DOI Listing
February 2014

A case of complete tetraploidy in amniocentesis with normal karyotype in subsequent cordocentesis.

J Pediatr Genet 2012 Dec;1(4):243-6

Department of Medical Biology and Genetics, Faculty of Medicine, Dicle University, Diyarbakir, Turkey.

We report a case of complete tetraploidy in amniotic fluid culture obtained at 17 wk of pregnancy. Amniocentesis was performed in this pregnancy because of a high-risk maternal serum screening result and abnormal ultrasound findings. Amniotic fluid was cultured in two flasks. Growth was very slow in one culture with no growth in the other. Harvest was possible after 3 wk, which revealed tetraploidy in all studied plates. Subsequent cordocentesis was performed to confirm the diagnoses of amniocentesis. Chromosomal analysis of the cordocentesis revealed a normal karyotype with 46,XY. A healthy male infant was born at term. This case illustrates that abnormal karyotypes in poor growth cultures could be misleading and should be confirmed by another technique, such as cordocentesis.
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http://dx.doi.org/10.3233/PGE-12039DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5020950PMC
December 2012

Tuberous sclerosis presented with polycystic kidney disease and acute renal failure.

Arch Iran Med 2012 Jun;15(6):384-6

Department of Internal Medicine, Family Medical Center, Diyarbakir, Turkey.

Tuberous sclerosis complex (TSC) is an autosomal dominant disorder characterized by hamartomatous involvement of multiple organs such as the skin, central nervous system, kidneys, lungs, and heart. A linkage has been found with a locus on the long arm of chromosome 9 (9q34) and with a locus on the short arm of chromosome 16 (16p13). TSC has a birth incidence of 1/6000. Children with TSC are almost universally born with normal kidneys, but cystic disease and angiomyolipomas develop with increasing age. Angiomyolipomas, renal cysts, and renal cell carcinoma are classical features of renal involvement in TSC. Renal complications are the most common cause of death in adult TSC patients, thus renal involvement has a crucial importance on the course of this disease. We present a 27-year-old patient previously diagnosed as tuberous sclerosis complex and referred with acute renal failure and polycystic kidney disease.
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http://dx.doi.org/012156/AIM.0015DOI Listing
June 2012

Parental decisions regarding a prenatally detected fetal chromosomal abnormality and the impact of genetic counseling: an analysis of 38 cases with aneuploidy in Southeast Turkey.

J Genet Couns 2010 Jun 30;19(3):241-6. Epub 2010 Jan 30.

Department of Medical Biology and Genetic, Medical Faculty, University of Dicle, 21280 Diyarbakir, Turkey.

This study investigated parental decision-making to terminate or continue a pregnancy after prenatal diagnosis of a chromosomal abnormality among a sample of patients in Southeast Turkey. Between 2004 and 2007, 1068 amniocentesis tests were performed in the Medical Biology and Genetic Department Laboratory at Dicle University. Aneuploidy was found in 38 cases (3.56%). Genetic counseling was provided for the couples that received abnormal results, and they were later interviewed and asked if they had continued or interrupted the pregnancy after the diagnosis. When confronted with autosomal aneuploidy in which a severe prognosis was expected, 85% of cases decided to terminate the pregnancy. When confronted with sex chromosome aneuploidy with a low risk of an abnormal clinical phenotype 60% of cases decided to continue the pregnancy. Among the diagnoses with aneuploidy, pregnancy was continued in 21.1% of cases due to religious beliefs regardless of whether there was a low or severe risk of an abnormal clinical phenotype. These findings indicate that both severity of abnormality and religiosity play an important role in genetic counseling patients' decision-making processes and outcomes in Turkey. In addition, the findings suggest the need for legislation that reduces the differences in approaches between the physicians and institutions regarding parental decision-making to terminate or continue a pregnancy in our country.
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http://dx.doi.org/10.1007/s10897-009-9275-3DOI Listing
June 2010

Phospholipid and triacylglycerol fatty acid composition of major life stages of sunn pest, Eurygaster integriceps (Heteroptera: Scutelleridae).

Comp Biochem Physiol B Biochem Mol Biol 2002 Jun;132(2):375-80

Department of Biology, Science and Art Faculty, University of Dicle, 21280 Diyarbakir, Turkey.

Phospholipid and triacylglycerol fatty acid compositions of whole animals from all life stages of Eurygaster integriceps, including eggs, nymphs, pre-diapausing adults and diapausing adults, were determined. The fatty acid composition of total lipids of their food, wheat, was also determined. The major components of the insects and their food were the expected C16 and C18 saturated and unsaturated fatty acids. Since fatty acid compositions of third-stadium nymphs were not similar to the profiles of their food, most likely, dietary fatty acids are modified by the insect. The fact is that the food does not provide C20 polyunsaturated fatty acids, but the insect tissue lipids include these components. We suggest biosynthesis of the C20 components by elongation/desaturation of C18:2n-6, an abundant component of the diets. We also show differences in fatty acid profiles from each of the life stages.
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http://dx.doi.org/10.1016/s1096-4959(02)00045-3DOI Listing
June 2002
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