نتایج جستجو برای: azf region
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BACKGROUND The three azoospermia factor (AZF) regions of the Y chromosome represent genomic niches for spermatogenesis genes. Yet, the most distal region, AZFc, is a major generator of large-scale variation in the human genome. Determining to what extent this variability affects spermatogenesis is a highly contentious topic in human reproduction. METHODS In this review, an extensive character...
The glucagon-like peptide-1 receptor (GLP-1R) is a key therapeutic target in the management of type II diabetes mellitus, with actions including regulation of insulin biosynthesis and secretion, promotion of satiety, and preservation of β-cell mass. Like most class B G protein-coupled receptors (GPCRs), there is limited knowledge linking biological activity of the GLP-1R with the molecular stru...
We developed a strategy for creating epitope maps of monoclonal antibodies (mAbs) that bind to G protein-coupled receptors (GPCRs) containing photo-cross-linkers. Using human CXC chemokine receptor 4 (CXCR4) as a model system, we genetically incorporated the photolabile unnatural amino acid p-azido-l-phenylalanine (azF) at various positions within extracellular loop 2 (EC2). We then mapped the ...
Amaç: Y kromozom mikrodelesyonları dahil olmak üzere genetik faktörler erkek infertilitesi olgularının yaklaşık %10’undan sorumludur ve özellikle azoospermi veya ciddi oligozoospermi ile ilişkilidir. Çalışmamızda Trakya bölgesi’nde mikrodelesyon sıklığını saptamak AZF mikrodelesyonu olan infertil olgularda heterojen fenotip hakkında bilgi sunmak amaçlanmıştır. Gereç Yöntem: Üniversitesi Hastane...
مقدمه: ناباروری یکی از مشکلات عمده در زندگی افراد نابارور است. یکی از دلایل عمده ی ژنتیکی ناباروری وقوع حذف ها در کرومزوم y است که با فراوانی 1 تا 15 درصدی در افراد مبتلا به آزوسپرمی و الیگواسپرمی شدید گزارش شده است. بر روی کروموزوم y 3 ناحیه به نام عوامل آزوسپرمی (azoospermia factor یا azf) شناخته می شوند. این سه ناحیه با عناوین azfa، azfb و azfc به عنوان ناحیه ی اسپرم سازی تعیین شده اند. در...
Background: The PIWI-interacting RNA (piRNA) pathway has an essential role in transposon silencing, meiosis progression, spermatogenesis, and germline maintenance. HIWI genes are critical for piRNA biogenesis and function. Therefore, polymorphisms in HIWI genes contribute to spermatogenesis defects and can be considered as risk factors for male infertility. The aim of the present study was to i...
abstract: in this thesis, we focus to class of convex optimization problem whose objective function is given as a linear function and a convex function of a linear transformation of the decision variables and whose feasible region is a polytope. we show that there exists an optimal solution to this class of problems on a face of the constraint polytope of feasible region. based on this, we dev...
PURPOSE We assessed the frequency of azoospermia factor a (AZFa), AZFb, and AZFc deletions and examined correlations between the deletion sites and the success rates of sperm presence within the ejaculate and surgical sperm retrieval in Korean men. MATERIALS AND METHODS A total of 1,919 azoospermic and severely oligozoospermic men were assessed for Y chromosome microdeletions. Among them, 168...
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