Genes Encoding HLA Antigens

Genes Encoding HLA Antigens The genes encoding HLA antigens are clustered on chromosome 6p21 at the telomeric end of the HLA region. Relatively few HLA class I genes are transcribed or translated.The expressed class I genes are subdivided into class Ia, which includesHLA-A, -B,and -C, and class Ib, which includes HLA-E, -F, and -G. As a non-classical major histocompatibility complex class I molecule, HLA-G is expressed predominantly and restrictedly in extravillous trophoblast cells at maternal–fetal interface. Alternative transcription of spliced HLA-G mRNAs encodes at least seven different HLA-G iso- forms, namely the membrane-bound HLA- G1, -G2, -G3 and -G4, and the soluble HLA-G5 and -G6 and –G7 proteins (1, 2). Experiments in vitro showed that HLA-G may contribute to maternal acceptance of the semi-allogenic fetus, by suppressing the maternal immune system during.it has been shown to bind to the immunoglobulin-like transcript (ILT)-2 and killer inhibitory receptor (KIR)2DL4 (p49) inhibitory r eceptors on NK cells and confer protection to extravillous trophoblasts (EVTs) via these receptors (3)(Figure2). This suggests that the interaction between HLA-G and immunocompetent cells at the placental interface could be critical in determining the outcome of pregnancy. In this regard, it may be helpful to look for deviations in these interactions by studying early pregnancy disorders of unknown aetiology (4). Among its several limited polymorphisms, the 14-bp ins/del polymorphism at 3 ´ untranslated region (3 ´UTR) of HLA-G gene has been shown an important role in post-transcriptional regulation of HLA-G molecule(5). Reports indicated that 14-bp polymorphism is associated with HLA-G mRNA stability and isoform alternative splicing patterns, therefore may influence functionality of HLA-G in pregnancy (6). In the present study, we analysed the 14-bp insertion ⠁„ deletion polymorphism in normal pregnancy and recurrent miscarriage patients with different miscarriage frequencies and discovered a possible correlation between the 14-bp polymorphism and recurrent miscarriage. Material and methods We carried out a case–control study. Peripheral blood samples were obtained from iranian women who had been seen at the infertility center in Yazd city during 2013 to 2014 for the evaluations of recurrent miscarriage. All of these women had regular menstrual cycles and were health. We analyzed a total of 200 patients with three or more recurrent spontaneous abortions (as a case group) and 200 healthy women without any history of abortion (as a control group). During the entire investigation period the current laws of ethical committee were followed; the patients gave their informed consent for use of their blood collected. Studied patients were without anatomical, microbial, viral, genetical disease and hormone profile tests and tests for ovulation and tubal patency were normal. Male partner’s semen analysis were included in the study. According to medical evidences, etiology of these abortions are unexplained. The following data for the patients were obtained: age, age at each abortion, numbers of abortions, time of abortion during each pregnancy, familial history of abortion, occurrence of bleeding and pain during abortion. Genotyping of the 14-bp insertion ⠁„ deletion polymorphism The blood samples of the control group and of the patients were collected in tubes containing EDTA. The molecular analyses were performed using DNA extracted from peripheral blood leukocytes with a routine salting out procedure. The 14-bp insertion ⠁„ deletion polymorphism was genotyped using the polymerase chain reaction (PCR). The amplification was done using the forward primer 5 ´-GTGATGGGCTGTTTAAAGTGTCACC-3 ´ and the reverse primer 5 ´-GGAAGGAATGCAGTTCAGCATGA-3 ´ for the HLA-G 14 bp insertion/deletion polymorphism analysis. PCR products were run on 1% agarose gel electrophoresis. The sizes of the PCR products were confirmed by sequence analysis. The PCR products of exon 8 were analysed by 10% nondenaturing poyacrylamidel gel electrophoresis containing ethidium bromide and visualized under ultraviolet light. PCR products were of either 224 or 210 bp, respectively,depending on the insertion/deletion of the 14 bp in exon 8. The cycling conditions used were: 94  °C for 5 min; 35 cycles of 94  °C for 1 min, 55  °C for 1 min, 72  °C for 30 s; and a final cycle extension at 72  °C for 5 min. Statistical analysis The data were analyzed by using the Chi-square test in the presence and absence of 14-bp insertion ⠁„ deletion polymorphism expressing individuals. Odds ratio was calculated with a confidence interval of 95 %. The data were processed by SPSS 16 software. The significance level of the tests for considering Pvalues as significant was set to Results HLA-G genotype frequencies were in agreement with a Hardy–Weinberg equilibrium in this study. Depending on the 14-bp deletion homozygotes, 14-bp insertion homozygotes or +14-bp ⠁„-14- bp heterozygotes of exon-8, the size of the amplified PCR products was either 224 or 210 bp or both in the case of heterozygotes (Figure 1) and was confirmed by DNA sequencing (Figure 2). Our results showed that both the +14-bp ⠁„-14- bp and -14-bp ⠁„-14-bp genotype frequencies were not significantly different between patients with recurrent miscarriages and fertile controls. However, the genotype frequency of +14-bp ⠁„ +14-bp homozygotes was significantly increased in those with recurrent abortions (three or more abortions) as compared with normal fertile controls. The mean age in the case group was: 35.3 yr  ± 5.8 (range 19–43), the mean age in the control group was: 34.9 yr  ± 3.2, (range 20–41) (Pvalue =0.40), in addition, some features of patients shown in Table 1. Distribution of the genotypes in the RSA patient and control groups is shown in Table 2. Frequencies were consistent with those previously reported by other investigators. (p value =) Discussion For more than two decades, the non-classical human leucocyte antigen (HLA) class I molecule HLA-G has been supposed to be an important immunoloregulation molecule in the maintenance of foetal–maternal immunotolerance. HLA-G has the ability to inhibite immune cell functions like natural killer cells, cytotoxic T cells and dentritic cells. In our study, we focused on the 14-bp deletion ⠁„ insertion polymorphism in the 3 ´ UTR of exon 8 of the HLA-G gene,which may contribute to the regulation of HLA-G expression. Our results showed that there were more women who were heterozygous in RSA group than in the fertile controls. Also the frequency of the +14-bp variant showed a significant increase in patients with three or more miscarriages. Thus, our data suggest that there is a detectable relationship between susceptibility to recurrent miscarriages and +14-bp homozygotes of the HLA-G locus.A report by Hviid et al. showed a significant over representation of the 14-bp +⠁„ + 14-bp HLA-G genotype in a recurrent miscarriage group. Although no significant difference was observed for the 14-bp +⠁„+14-bp genotype between the recurrent miscarriage and the control groups in their study, the same trend was found by Yan et al. Their hypothesis was that the frequencies of the HLA-G genotype, homozygous for the + 14-bp sequence, would be higher in women with several unsuccessful IVF treatments or with recurrent miscarriage than in control groups. This hypothesis was based on a previously published study. HLA-G alleles may result in different levels of HLA- G proteins. To date, the 14-bp deletion has been assigned to the G*010101, G*0102 and G*010401 alleles, and the 14-bp insertion to the G*010102, G*010103, G*0103, G*0105N and G*0106 alleles. Rebmann et al. reported that alleles G*01013 and G*0105N with the +14-bp sequence are known as ‘lowsecretor’ alleles, and are associated with reduced soluble HLA-G levels . Thus, The 14-bp insertion in ex on 8 of the HLA-G gene may be associated with low levels of plasma soluble HLA-G. Low concentrations of soluble HLA-G in maternal serum appear to be correlated with adverse pregnancy outcomes in IVF pregnancies .If the HLA-G ‘low-secretor’ allele is a factor involved in the pathogenesis of recurrent miscarriage, one would expect an increase in the number of carriers with the number of recurrent miscarriages , which is in agreement with the results of this study. The HLA-G 14 bp insertion ⠁„ deletion polymorphism may, in turn, affect the serum levels of sHLA-G and pregnancy maintenance, although the exactm mechanisms will require further study. The reason may be explained as follows, serum secreted HLA-G is conductive to early embryo implantation, as insufficient serum sHLA-G pro- motes trophoblasts attack by the mother’s immune cells induced by early embryonic trophoblast invasion of spiral arteries. This can result in a loss of implantation andpregnancy mai ntenance, leading to embryo loss as unexplained recurrent miscarriage .Based on these observations, our data indicate that the difference in HLA-G 14-bp genotype frequencies is not highly significant in this study. Probably, HLA-G as a single factor has a very modest effect in relation to risk for recurrent miscarriage. However, more genotyping investigations and functional studies on immune regulation are essential to elucidate the role of HLA-G in pregnancy. HLA-G gene encodes four membrane-bound and three soluble HLA-G isoforms by alternative splicing (16). The 14- bp insertion/deletion polymorphismin exon 8 of the HLA-G gene has been reported to be associated with HLA-G mRNA stability and splicing patterns, thus may play a role in the context of HLA-G functionality during pregnancy (17). Few studies on 14-bp polymorphism have been carried out in the association with RSA to date. A study by Tripathi et al. (14) indicated that 14-bp polymorphism is not a susceptible risk factor fo r RSA, but the number of heterozygotes (14bp1/2) was increased in the RSA group. However, another study indicated that homozygosity for the presence of the 14-bp polymorphism was higher in women with RSA than in the control groups (13). Recently, a report by Hviid et al. (15) showed a significant over- representation of 14bp 1/1 HLA-G genotype in the RSA group. Although no significant difference was observed for the 14bp 1/1 genotype between the RSA and the control groups in the current study, the same trend was found. In regard to the frequency of 14bp 1/2 heterozygotes, our study is inconsistent with that by Tripathi et al. (14) where more number of heterozygotes was observed in the RSA group. The discrepancy may be the result of ethnic variations, for a significantly different distribution of the 14-bp genotype was observed among Chinese, Danish, and Indian populations (Table 2) (14, 15). The 14-bp polymorphisms are involved in the stability and splicing patterns of the HLA-G mRN A isoforms. A rather detailed study by Hviid et al. (10) addressed that the HLA-G isoform transcripts were at a significantly lower level than the corresponding HLA-G isoform mRNA with the 14-bp sequence deleted, and an additional alternative splicing pattern, especially the HLA-G2 mRNA, could be observed with the presence of the 14-bp sequence. In accordance with this, a study by Rebmann et al. reported that HLA-G allelic variants are associated with plasma-soluble HLA-G levels. Alleles G*01013 and G*0105N with the 14-bp sequence are known as ‘low-secretor’ alleles, whereas alleles without the 14-bpsequence such as G*01041 are known as ‘high-secretor’ alleles, which are associated with elevated soluble HLA-G levels (18).Therefore, particular HLA-G alleles may result in different levels of HLA-G proteins. In the current study, higher frequencies of the 14-bpinsertion allele in RSA group may be a reflection of the association between the 14-bp insertion and the altered balance in HLA-G mRNA isoforms and probably the protein concentration. A recent report by Yie et al. (19) addressed that the embryos that express HLA-G benefit a higher in vitro fertilization rate. To the contrary, low soluble HLA-G seems to be correlated with an adverse pregnancy outcome (20). Taken together, our data indicated that the 14-bp insertion allele might have importance in the outcome of pregnancy. However, more genotyping investigations and functional studies on immune regulation are essential to elucidate the role of HLA-G in pregnancy.

Love Is Not All, or Is It? Essay

Edna St. Vincent Millay, â€Å"Love is Not All† Love is not all: it is not meat nor drink Nor slumber nor a roof against the rain; Nor yet a floating spar to men that sink And rise and sink and rise and sink again; 5Love can not fill thickened lung with breath, Nor clean the blood, nor set the fractured bone; Yet many a man is making friends with death Even as I speak, for lack of love alone It well may be that in a difficult hour, 10 Pinned down by pain and moaning for release, Or nagged by want past resolution’s power, I might be driven to sell your love for peace, Or trade the memory of this night for food It well may be I do not think I would. Part I: Paraphrase the Poem. Love isn’t everything, it’s not food, beverages, sleep and it sure won’t act as a roof against the rain. Love cannot offer a sinking man in peril a life-saving â€Å"floating spar†. As he rises, he sinks, only to rise and sink again. Love cannot give the air we need to fill our â€Å"thickened lung†, it can not clean blood or heal broken bones. Yet for all the things love can’t do, a man without love is a man â€Å"making friends with death†. The lack of love alone in a difficult hour will pin you down by pain, whine for release or harass you by the power of past resolution’s. One might be driven to sell love for peace, trade their memories for a meal, but never give up love even if it was to release horrible pains or to get food to live. Part II: Scan the Poem. / = stressed syllable ^ = unstressed syllable = half-stressed syllable || = significant pause ^ / | ^ / | ^ / | ^ / | ^ / | 1Love is not all: it is not meat nor drinkA ^ / | ^ / | ^ / | ^ / | ^ / | 2Nor slumber nor a roof against the rain;B ^ / | ^ / | ^ / | ^ / | ^ / | 3Nor yet a floating spar to men that sinkA ^ / | ^ / | ^ / | ^ / | ^ / | 4And rise and sink and rise and sink again;B ^ / | ^ /| ^ /| ^ / | ^ / | 5Love can not fill thickened lung with breath,C ^ / | ^ / | ^ / | ^ / | ^ / | 6Nor clean the blood, nor set the fractured bone;D ^ / | ^ / | ^ / | ^ / | ^ ^ / | 7Yet many a man is making friends with deathC ^ / | ^ / | / ^ | / ^ | ^ ^ / | 8Even as I speak, for lack of love aloneD ^ / | ^ / | ^ / | ^ / |^ / | || 9It well may be that in a difficult hour,E ^ / | ^ / | ^ / | ^ / | ^ / | 10Pinned down by pain and moaning for release,F ^ / | ^ / | ^ /| ^ / | ^ /| || 11Or nagged by want past resolution’s power,E ^ / | ^ / | ^ ^ / | ^ / | ^ / | 12I might be driven to sell your love for peace,F ^ / | ^ / | ^ / | ^ / | ^ ^ / | 13Or trade the memory of this night for foodG ^ / | ^ / | ^ / | ^ / | ^ / | 14It well may be I do not think I would. G * Line 1-6 are composed with Iambic pentameters, which are ten syllables for each line in five Iambic pairs. * Line 7 is mostly Iambic with the last feet being Anapest. * Line 8 is the most complexe, the foot division are: Iamb, Iamb, Trochee, Trochee, Anapest. * Line 9-11 are composed with Iambic pentameters as well, line 9 and 11 both have a significant pause at the end. * Line 12 has 4 feet of Iamb and one feet of Anapest directly in the middle. * Line 13 has 4 feet of Iamb ended with a feet of Anapest. * Line 14 is a Iambic pentamerter. The Rhyme scheme is ABAB, CDCD, EFEF, GG. Part III: Write a Short Essay. Love is Not All, Or is It ? In Edna St. Vincent Millay’s sonnet â€Å"Love is Not All’, the speaker depicts that love isn’t the most important thing in life, but you would do anything for it. In the first half, Millay declares that love is useless and unsubstantial to life’s requirement. The second half of the sonnet successfully outshines the previous half because although she has shown that love isn’t needed to live, Millay makes it clear that life isn’t worth living without it. Furthermore, love is not something that will help you physically; however, it always goes back to the fact that it’s the most influential and overpowering thing over you. Millay elaborates on the aspect of love, love can’t do everything, love can’t save a life, nor be a shelter or a doctor. Each section of the sonnet reflects a human need: food, shelter, health and emotion. Love cannot fill our stomach with â€Å"meat† (1) nor can it hydrate us, as illustrated by â€Å"drink† (1). Also, love will not regenerate a worn out man from â€Å"slumber† (2) and sure won’t offer shelter or a â€Å"roof against the rain†(2). Millay effectively shows that love is worthless on a physical level: as love can’t offer a man in peril a life saving â€Å"floating spar† (3), offer the precious air our lungs need to breathe, heal our body from illness nor â€Å"clean the blood† (6) or fix the broken bones. Millay writes: â€Å"I might be driven to sell your love for peace / Or trade the memory of this night for food† (12-13), to produce a scenario in which she is forced to choose between love and life. The imagery you imagine reading this sonnet is very concrete, even spine-tingling at times; therefore, far from the sweet sentimental ones normally associated with love sonnets. Love, as described by Millay, seems almost as if it’s worth nothing. For all the things that love cannot do, the author insists that we still need love to live. Millay makes it evident when she writes: â€Å"Yet many a man is making friends with death / Even as I speak, for lack of love alone† (7-8), trying to give her readers the point of view that men can die without love. A lovelorn man is closer to death. Line eight really changes the direction of this sonnet because at first, Millay’s definition of love was worthless and now the reader notices that she starts restoring the significant importance of love. The next lines begin with â€Å"It well may be† (9), which introduces the reader to a hypothetical situation being â€Å"Pinned down by pain and moaning for release / Or nagged by want past resolution’s power† (10-11). These two lines influence how the reader portrays love because nothing is more important, then filling that hole in our heart when love is missing. At the end of the sonnet, Millay offers a plausible solution to fill her human needs as she â€Å"might be driven to sell your love for peace† (12) for it would release her from the horrible pains. She might â€Å"trade the memory of this night for food† (13) to feed her starving stomach. For all that love is, Millay reveals everything when she writes: â€Å"It well may be I do not think I would† (14) meaning that love is not all, but she would rather be dead than not have it. What exactly is love? It is the hardest emotion to control, one does not simply choose whom to love, it just happens. Love’s not something you can see or touch, but you are well aware when love touches you. Love is not all, it doesn’t answer to life’s requirements; however, love is indispensable to meet those requirements and live peacefully. While reading Edna St. Vincent Millay’s sonnet â€Å"Love is Not All† the reader realizes that love is so powerful and rewarding. In an attempt to bring agreement between love and life, Millay chooses love because life is nothing without love. Work Cited Edna St. Vincent Millay, â€Å"Love is Not All† (456)

Apa Research and Bibliography Activity Essay - 656 Words

APA Research and Bibliography Activity Part One: Assessing the RELIABILITY and Validity of Sources IN THE SPACE PROVIDED IN COLUMNS TWO AND THREE OF THE FOLLOWING MATRIX, PREPARE A 50-100-WORD EVALUATION OF BOTH THE RELIABILITY AND VALIDITY OF EACH OF THE SOURCES LISTED IN COLUMN ONE. |Source |Reliability |Validity | |Wikipedia |Wikipedia is not a reliable source. It is an online encyclopedia where that |It is not a validity source. The web site has no peer review and the information can | | |information can be added and†¦show more content†¦Not everyone is permitted to post |error free and will be sufficient to every reader preference. The site does include | | |and remove information from the website. |peer reviewed and scholarly journal and article. | |Arizona Department of |Arizona Department of Health Services Web Site is a reliable website. The |Arizona Department of Health Services Web Site is a valid website. The information | |Health Services Web Site |information are updated and checked for accuracy by the company. It is not |provided in the website is accurate and up to date as quickly as possible. The web | | |scholarly article but a government base page to help people fill out the |site is not a bias source. It displays direct information needed for a viewer to | | |necessary paper work needed for the health. 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Essay about The Rise of Colonies and the Causes of...

The Rise of Colonies and the Causes of Revolutions Imperialism is known as taking over the political and military aspects of a territory and colonialism is the movement of a large amount of people from their home area to the newly seized region. Imperialism usually occurs first over an area and then comes the colonialism period of the newly apprehended territory (Soomo, 2013a). Discussion Discovery of North America occurred in 1492 by Christopher Columbus. There were already millions of Native Americans living in this newly discovered land; however, that did not stop the Europeans from coming over shortly after the discovery to claim the area as their own. Spain, France, and England were the primary invaders of the land and each of†¦show more content†¦The Pueblo Indians defeated the Spanish in 1607 by killing 400 people and taking back their land (Soomo, 2013e). Another Native American group called the Powhatan that dominated most of the Chesapeake area had cooperated with the new inhabitants of what was then known as Jamestown through the diplomatic relations between their Chief and Captain John Smith who was originally sent there to help the hungry settlers of the area. However, once John Smith died, the Powhatan rebelled against the settlers and tried to shove back the empire. Other Native Americans worked with the French settlers and helped them with trading fur (Soomo, 2013f). There have been numerous revolutions over the years with some of them being violent while others were non-violent. One of the most prominent violent revolutions is the American Revolution. This was a war of independence between the American colonies and Britain and it was filled with many protests with countless lives lost in the numerous battles all around the colonies. 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