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The Lewis antigen system is a human blood group system. It is based upon two genes on chromosome 19: FUT3, or Lewis gene; and FUT2, or Secretor gene. Both genes are expressed in glandular epithelia. FUT2 has a dominant allele which codes for an enzyme (designated Se) and a recessive allele which does not produce a functional enzyme (designated se). Similarly, FUT3 has a functional dominant allele (Le) and a non-functional recessive allele (le). There are two main types of Lewis antigens, Lewis a (Le-a) and Lewis b (Le-b). There are three common phenotypes: Le(a+b-), Le(a-b+), and Le(a-b-).

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  • نظام مستضدات لويس (ar)
  • Système Lewis (fr)
  • Sistema Lewis (it)
  • Lewis antigen system (en)
  • Układ grupowy Lewis (pl)
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  • Układ grupowy Lewis – jeden z wielu układów grup krwi człowieka. Układ ten składa się z 6 antygenów kodowanych przez geny zlokalizowane na ramieniu krótkim chromosomu 19. Numer tego układu to 007, a symbol – LE. (pl)
  • نظام مستضد لويس (بالإنجليزية: Lewis antigen system)‏ يكون عبارة عن نظام مجموعة دم عند الإنسان يتعمد على مورثات موجودة على الصبغي 19 q13.3, (fut2) و (fut3)19p13.3 , الذي يحتويان على نشاط فيوسوسيترانسفيريز (fucosyltransferase). يوجد نوعان رئيسيان من مستضدات لويس ولويس أ ولويس ب، ويكونان ضمن المستضدات المتواجدة على خلية الدم الحمراء (بالإنجليزية: erythrocyte)‏. مستضدات لويس تكون مكونة من إفرازات غدة خارجية في النسيج الطلائي (بالإنجليزية: Exocrine epithelial secretions)‏ وفيما بعد تبدا تتكثف على خلية الدم الحمراء. (ar)
  • The Lewis antigen system is a human blood group system. It is based upon two genes on chromosome 19: FUT3, or Lewis gene; and FUT2, or Secretor gene. Both genes are expressed in glandular epithelia. FUT2 has a dominant allele which codes for an enzyme (designated Se) and a recessive allele which does not produce a functional enzyme (designated se). Similarly, FUT3 has a functional dominant allele (Le) and a non-functional recessive allele (le). There are two main types of Lewis antigens, Lewis a (Le-a) and Lewis b (Le-b). There are three common phenotypes: Le(a+b-), Le(a-b+), and Le(a-b-). (en)
  • Le système Lewis, noté LE, no 007 dans la nomenclature de l'ISBT, est un système de groupe sanguin et tissulaire humain.Dans le plasma, les antigènes Lewis sont portés par des glycosphingolipides issus des tissus périphériques. Ils sont adsorbés sur les érythrocytes et deviennent ainsi des déterminants de groupe sanguin. Ils sont portés par les chaînes oligosaccharides de type 1, Galβ1-3GlcNAcβ1-R, des glycoprotéines et des glycosphingolipides dans les épithéliums intestinaux et pulmonaires et dans les glandes exocrines. Ceci est le système Lewis a/b. (fr)
  • Il sistema Lewis è un sistema dei 38 gruppi sanguigni umani. Esistono due tipi principali di antigeni di Lewis, Lewis a (Lea o Le-a) e Lewis b (Leb o Le-b), e tre fenotipi comuni: Le(a+b-) (o Lea+b-), Le(a-b+) (o Lea-b+) e Le(a-b-) (o Lea-b-). (it)
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  • نظام مستضد لويس (بالإنجليزية: Lewis antigen system)‏ يكون عبارة عن نظام مجموعة دم عند الإنسان يتعمد على مورثات موجودة على الصبغي 19 q13.3, (fut2) و (fut3)19p13.3 , الذي يحتويان على نشاط فيوسوسيترانسفيريز (fucosyltransferase). يوجد نوعان رئيسيان من مستضدات لويس ولويس أ ولويس ب، ويكونان ضمن المستضدات المتواجدة على خلية الدم الحمراء (بالإنجليزية: erythrocyte)‏. مستضدات لويس تكون مكونة من إفرازات غدة خارجية في النسيج الطلائي (بالإنجليزية: Exocrine epithelial secretions)‏ وفيما بعد تبدا تتكثف على خلية الدم الحمراء. من الممكن ان يحمل الشخص كلا المتضيدين (لويس أ ولويس ب) وأيضا من الممكن ان لايحمل أي منهما. لكن الأكثر شيوعا هو عدم حمل لويس أ وحمل لويس ب. حمل المستضيدين معا يعتبر نادراً. الرابط بين مجموعة الدم لويس والافرازات لمستضدات مجموعة الدم (ABO) كان أول مثال على التأير المتعدد للجين الإنساني. وجود فيوسويلاترانسفيريز (بالإنجليزية: Fucosyltransferase)‏ يحول لويس أ إلى لويس ب.الأشخاص الذين يحملون لويس أ عادةً لا يفرزون المستضد A و B و H (بالإنجليزية: ABO blood group system)‏ ووجود لويس ب يجعل الشض مفرزاً. الشخص الذي لا يحمل مستضدات لويس يمكن أن يكون مفرزًا أو ليس مفرزًا. (ar)
  • The Lewis antigen system is a human blood group system. It is based upon two genes on chromosome 19: FUT3, or Lewis gene; and FUT2, or Secretor gene. Both genes are expressed in glandular epithelia. FUT2 has a dominant allele which codes for an enzyme (designated Se) and a recessive allele which does not produce a functional enzyme (designated se). Similarly, FUT3 has a functional dominant allele (Le) and a non-functional recessive allele (le). The proteins produced by the FUT2 and FUT3 genes modify type I oligosaccharide chains to create Lewis antigens. These oligosaccharide chains are similar to the type II chains of the ABO blood system, with a single bond in a different position. The link between the Lewis blood group and secretion of the ABO blood group antigens was possibly the first example of multiple effects of a human gene: the same enzyme (fucosyltransferase2) which converts the Le-a antigen to Le-b is also responsible for the presence of soluble A, B and H antigens in bodily fluids. There are two main types of Lewis antigens, Lewis a (Le-a) and Lewis b (Le-b). There are three common phenotypes: Le(a+b-), Le(a-b+), and Le(a-b-). The enzyme fucosyltransferase 3 (FUT3), encoded by Le gene, adds a fucose to the precursor oligosaccharide substrate, converting it to the Le-a antigen. People who have the Le allele and who are non-secretors (homozygous for the nonfunctional se allele) will express the Le-a antigen in their bodily fluids and on their erythrocytes. If a person has both the Le and Se alleles, their exocrine cells will also have the enzyme fucosyltransferase 2 (FUT2). This adds fucose to the oligosaccharide precursor in a different position from the FUT3 enzyme. This produces the Le-b antigen. In most people having both Le and Se, it is difficult to detect the antigen Le-a. This is because the activity of the FUT2 enzyme is more efficient than the FUT3 enzyme, so the type I oligosaccharide chain is mostly converted into Le-b instead of Le-a. Therefore, people with readily detectable Lewis-a antigen are non-secretors; they do not have FUT2 activity. Lewis-b antigen is found only in secretors: people who possess the Se allele and thus have FUT2 activity. Lewis negative people (Le a-, Le b-) are homozygous for the recessive le allele and can be either secretors or non-secretors. (en)
  • Le système Lewis, noté LE, no 007 dans la nomenclature de l'ISBT, est un système de groupe sanguin et tissulaire humain.Dans le plasma, les antigènes Lewis sont portés par des glycosphingolipides issus des tissus périphériques. Ils sont adsorbés sur les érythrocytes et deviennent ainsi des déterminants de groupe sanguin. Ils sont portés par les chaînes oligosaccharides de type 1, Galβ1-3GlcNAcβ1-R, des glycoprotéines et des glycosphingolipides dans les épithéliums intestinaux et pulmonaires et dans les glandes exocrines. Ceci est le système Lewis a/b. Il existe un second système, le système Lewis x/y, qui est basé sur les oligosaccharides de type 2, Galβ1-4GlcNAcβ1-R. Chaque système dépend de l'action de deux fucosyltransférases, FUT2 et FUT3 pour le premier, FUT1 et FUT3 pour le second. (fr)
  • Il sistema Lewis è un sistema dei 38 gruppi sanguigni umani. Esistono due tipi principali di antigeni di Lewis, Lewis a (Lea o Le-a) e Lewis b (Leb o Le-b), e tre fenotipi comuni: Le(a+b-) (o Lea+b-), Le(a-b+) (o Lea-b+) e Le(a-b-) (o Lea-b-). Si basa su due geni sul cromosoma 19: o “gene Lewis”; e , o “gene Secretor”. Entrambi i geni sono espressi nell'epitelio ghiandolare. FUT2 ha un allele dominante che codifica per un enzima (denominato Se) e un allele recessivo che non produce un enzima funzionante (denominato se). FUT3 ha un allele dominante funzionante (Le) e un allele recessivo non funzionante (le). Gli antigeni di Lewis sono espressi sulla superficie dei globuli rossi, dell'endotelio, dei reni, dell'epitelio genito-urinario e gastrointestinale. Questi antigeni sono antigeni dei globuli rossi che non sono prodotti da loro stessi: sono componenti delle secrezioni epiteliali esocrine che vengono successivamente adsorbiti sulla superficie del globulo rosso. (it)
  • Układ grupowy Lewis – jeden z wielu układów grup krwi człowieka. Układ ten składa się z 6 antygenów kodowanych przez geny zlokalizowane na ramieniu krótkim chromosomu 19. Numer tego układu to 007, a symbol – LE. (pl)
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