{"id":1650,"date":"2024-06-11T13:54:53","date_gmt":"2024-06-11T13:54:53","guid":{"rendered":"https:\/\/novaptech.com\/?page_id=1650"},"modified":"2025-02-28T13:22:31","modified_gmt":"2025-02-28T13:22:31","slug":"definition-of-an-aptamer-novaptech","status":"publish","type":"page","link":"https:\/\/novaptech.com\/fr\/definition-of-an-aptamer-novaptech\/","title":{"rendered":"Definition of an aptamer | Novaptech"},"content":{"rendered":"
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Qu'est-ce qu'un aptam\u00e8re ? <\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Dans le domaine de la biotechnologie, les aptam\u00e8res suscitent un int\u00e9r\u00eat croissant en raison de leur r\u00f4le fondamental en recherche et en m\u00e9decine. Ces courts oligonucl\u00e9otides synth\u00e9tiques d'ADN ou d'ARN sont con\u00e7us pour se lier sp\u00e9cifiquement \u00e0 une cible donn\u00e9e. Leur int\u00e9r\u00eat r\u00e9side dans leur capacit\u00e9 \u00e0 remplacer les anticorps traditionnels et autres ligands d'affinit\u00e9. Cette propri\u00e9t\u00e9 offre des avantages significatifs en termes de co\u00fbt, de stabilit\u00e9 et de sp\u00e9cificit\u00e9. Les aptam\u00e8res sont de petites s\u00e9quences d\u2019acides nucl\u00e9iques, ADN ou ARN, s\u00e9lectionn\u00e9es in vitro pour leur capacit\u00e9 \u00e0 se lier avec une forte affinit\u00e9 \u00e0 une cible sp\u00e9cifique<\/p>

Dans les laboratoires de Novaptech, les aptam\u00e8res sont identifi\u00e9s gr\u00e2ce \u00e0 une technique appel\u00e9e SELEX (Systematic Evolution of Ligands by EXponential enrichment) et peuvent \u00eatre adapt\u00e9s pour reconna\u00eetre n'importe quelle cellule ou mol\u00e9cule, qu'il s'agisse d'une prot\u00e9ine, d'une enzyme, d'un m\u00e9dicament ou d'un compos\u00e9 chimique.<\/span><\/p>

D\u00e9couvrez les aptam\u00e8res et leurs applications dans divers domaines de la biotechnologie.<\/div><\/div><\/div><\/div><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Principaux avantages des aptam\u00e8res par rapport aux anticorps<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Les aptam\u00e8res sont des mol\u00e9cules synth\u00e9tiques pouvant \u00eatre d\u00e9velopp\u00e9es contre tout type de cible, y compris des mol\u00e9cules toxiques ou non immunog\u00e8nes. Leur affinit\u00e9 pour leurs cibles est comparable, voire sup\u00e9rieure, \u00e0 celle des anticorps. Ils sont dix fois plus petits que les anticorps et peuvent \u00eatre modifi\u00e9s chimiquement de mani\u00e8re d\u00e9finie et pr\u00e9cise. Ils se conservent et se transportent facilement, tout en pouvant \u00eatre d\u00e9natur\u00e9s par la chaleur de fa\u00e7on r\u00e9versible puis renatur\u00e9s. Leur approvisionnement est assur\u00e9 avec une reproductibilit\u00e9 totale des synth\u00e8ses d\u2019un lot \u00e0 l\u2019autre.<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Ils peuvent \u00eatre utilis\u00e9s dans des conditions non physiologiques \u00e0 des fins analytiques.<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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De plus, ils sont non immunog\u00e8nes et peuvent \u00eatre utilis\u00e9s in vivo.<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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\"Aptamers<\/figure><\/div>\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\tLes services aptam\u00e8res de Novaptech<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Des questions ? Contactez-nous<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Vous avez une question sur la s\u00e9lection d\u2019aptam\u00e8res ou le d\u00e9veloppement de tests ?\nVeuillez remplir le formulaire ci-dessous en d\u00e9taillant votre demande afin que nous puissions vous apporter une r\u00e9ponse pr\u00e9cise. Un appel t\u00e9l\u00e9phonique ou une visioconf\u00e9rence peut \u00eatre organis\u00e9(e) si n\u00e9cessaire, et un accord de confidentialit\u00e9 peut \u00eatre sign\u00e9 sur demande. Nous nous engageons \u00e0 vous r\u00e9pondre dans les plus brefs d\u00e9lais (g\u00e9n\u00e9ralement moins de 2 jours ouvr\u00e9s).<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\tContactez-nous<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"Biomarker\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Votre contact scientifique :<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Jean-Jacques Toulm\u00e9, PhD, CSO<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\tL'importance des aptam\u00e8res dans la recherche et la m\u00e9decine<\/a>\n\t\t\t\t\t<\/div>\n\n\t\t\t\t\t

The selective binding capacity of aptamers has major implications in research and medicine.
They are used in a variety of fields, from the specific detection of biomarkers to the design of targeted drugs.
Aptamers are also of interest in analytical chemistry\/biochemistry for the quantitative detection of biomarkers or contaminants.<\/span><\/span><\/p>

Origine et d\u00e9couverte des aptam\u00e8res<\/strong><\/span><\/p>

L'histoire des aptam\u00e8res remonte aux ann\u00e9es 1990, lorsque les chercheurs ont commenc\u00e9 \u00e0 \nexplorer de nouvelles alternatives aux anticorps traditionnels pour la reconnaissance des cibles. \nLa d\u00e9couverte et le d\u00e9veloppement des aptam\u00e8res ont \u00e9t\u00e9 salu\u00e9s comme une avanc\u00e9e majeure \ndans le domaine de la biotechnologie. Jack Szostack et Larry Gold ont \u00e9t\u00e9 des pionniers dans \nce domaine et ont notamment contribu\u00e9 \u00e0 d\u00e9finir les bases de la technologie SELEX.<\/p>

Comparaison avec d'autres sondes et ligands<\/strong><\/span><\/p>

Par rapport \u00e0 d'autres ligands tels que les anticorps, les aptam\u00e8res pr\u00e9sentent plusieurs \navantages. Ils sont plus stables, moins co\u00fbteux \u00e0 produire en grandes quantit\u00e9s et leur processus \nde s\u00e9lection in vitro est plus rapide et plus flexible. \nLes aptam\u00e8res peuvent \u00eatre d\u00e9velopp\u00e9s pour cibler des mol\u00e9cules sp\u00e9cifiques sans avoir recours \n\u00e0 l'\u00e9levage d'animaux ou \u00e0 la culture cellulaire, ce qui les rend particuli\u00e8rement int\u00e9ressants \npour des applications en recherche et en m\u00e9decine.<\/p>

Comment fonctionnent les aptam\u00e8res ?<\/strong><\/span><\/p>

Le processus de s\u00e9lection des aptam\u00e8res est la pierre angulaire de la cr\u00e9ation d'aptam\u00e8res \nsp\u00e9cifiques. Il commence par la g\u00e9n\u00e9ration d'une biblioth\u00e8que initiale d'oligonucl\u00e9otides \nal\u00e9atoires. Cette biblioth\u00e8que contient une multitude de s\u00e9quences d'ADN ou d'ARN, chacune \nayant une structure tridimensionnelle unique. \nCette biblioth\u00e8que est ensuite soumise \u00e0 des cycles de s\u00e9lection au cours desquels sont isol\u00e9s \ndes aptam\u00e8res ayant une grande affinit\u00e9 pour la cible souhait\u00e9e. Ces cycles consistent en une \ns\u00e9rie d'\u00e9tapes comprenant la liaison \u00e0 la cible, le lavage pour \u00e9liminer les s\u00e9quences non li\u00e9es \net, enfin, l'\u00e9lution des aptam\u00e8res li\u00e9s \u00e0 la cible. \nCe processus est r\u00e9p\u00e9t\u00e9 plusieurs fois de mani\u00e8re it\u00e9rative jusqu'\u00e0 ce que les aptam\u00e8res \npr\u00e9sentant une sp\u00e9cificit\u00e9 et une affinit\u00e9 \u00e9lev\u00e9es soient s\u00e9lectionn\u00e9s par Novaptech.<\/p>

Le m\u00e9canisme de liaison sp\u00e9cifique des aptam\u00e8res \u00e0 leur cible<\/strong><\/span><\/p>

Les aptam\u00e8res utilisent une vari\u00e9t\u00e9 d'interactions mol\u00e9culaires pour se lier \u00e0 leur cible : liaisons \nhydrog\u00e8ne, interactions \u00e9lectrostatiques et\/ou d'empilement, entre les nucl\u00e9otides de l'aptam\u00e8re \net les r\u00e9sidus de la cible. Cette interaction est hautement sp\u00e9cifique et d\u00e9pend des \ncaract\u00e9ristiques mol\u00e9culaires pr\u00e9cises de la cible. \nDe plus, la conformation tridimensionnelle de l'aptam\u00e8re est essentielle pour sa sp\u00e9cificit\u00e9. \nL'aptam\u00e8re adopte une structure pli\u00e9e particuli\u00e8re qui correspond parfaitement \u00e0 la forme de la \ncible. Cela garantit une liaison \u00e9troite et sp\u00e9cifique.<\/p>

Exemples de cibles couramment \u00e9tudi\u00e9es avec des aptam\u00e8res<\/strong><\/span><\/p>

Les aptam\u00e8res sont devenus des outils de choix pour la reconnaissance et l'\u00e9tude d'une vari\u00e9t\u00e9 \nde cibles biomol\u00e9culaires. Parmi les exemples couramment \u00e9tudi\u00e9s figurent les prot\u00e9ines, les \npeptides, les virus, les bact\u00e9ries, les cellules, les m\u00e9dicaments et les compos\u00e9s chimiques. \nPar exemple, des aptam\u00e8res ont \u00e9t\u00e9 d\u00e9velopp\u00e9s pour cibler sp\u00e9cifiquement des prot\u00e9ines telles \nque la thrombine, l'EGFR (r\u00e9cepteur du facteur de croissance \u00e9pidermique) et le facteur de \ncroissance de l'endoth\u00e9lium vasculaire (VEGF). Ces aptam\u00e8res sont utilis\u00e9s dans la recherche \nbiom\u00e9dicale pour des applications allant des biomarqueurs \u00e0 l'analyse des m\u00e9dicaments.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\tQuelles sont les applications des aptam\u00e8res dans la recherche ?<\/a>\n\t\t\t\t\t<\/div>\n\n\t\t\t\t\t

Utilisation des aptam\u00e8res en biologie mol\u00e9culaire<\/strong><\/p>

Aujourd'hui, les aptam\u00e8res sont des outils essentiels en biologie mol\u00e9culaire pour l'\u00e9tude de \ndivers processus cellulaires et mol\u00e9culaires. \nIls peuvent \u00eatre utilis\u00e9s pour analyser la structure et la fonction des prot\u00e9ines en se liant \nsp\u00e9cifiquement \u00e0 elles. Par exemple, les aptam\u00e8res sont utilis\u00e9s pour \u00e9tudier les interactions \nprot\u00e9ine-prot\u00e9ine, pour cibler des r\u00e9gions sp\u00e9cifiques des prot\u00e9ines ou pour inhiber \ns\u00e9lectivement leur activit\u00e9. \nCes applications sont essentielles pour comprendre les m\u00e9canismes biologiques sous-jacents \u00e0 \nde nombreuses maladies et pour d\u00e9velopper de nouvelles th\u00e9rapies.<\/p>

Applications dans le domaine du diagnostic et de la d\u00e9tection<\/strong><\/p>

Gr\u00e2ce \u00e0 leur haute sp\u00e9cificit\u00e9, les aptam\u00e8res sont capables de d\u00e9tecter des biomarqueurs \nsp\u00e9cifiques associ\u00e9s \u00e0 des maladies, tels que des prot\u00e9ines ou des m\u00e9tabolites. \nCette capacit\u00e9 permet \u00e0 Novaptech de cr\u00e9er des tests de diagnostic pr\u00e9cis, rapides et sensibles \npour des maladies telles que le cancer, les infections virales ou les maladies neurod\u00e9g\u00e9n\u00e9ratives. \nLes aptam\u00e8res sont \u00e9galement utilis\u00e9s pour d\u00e9tecter des substances toxiques ou des \ncontaminants dans l'environnement (pesticides, perturbateurs endocriniens, r\u00e9sidus de \nm\u00e9dicaments...).<\/p>

Les aptam\u00e8res en pharmacologie<\/strong><\/p>

Dans l'industrie pharmaceutique, les aptam\u00e8res jouent un r\u00f4le de plus en plus important dans la \nd\u00e9couverte de m\u00e9dicaments. Ils peuvent \u00eatre con\u00e7us pour cibler sp\u00e9cifiquement les prot\u00e9ines \nimpliqu\u00e9es dans les maladies, ouvrant ainsi la voie au d\u00e9veloppement de m\u00e9dicaments plus \nsp\u00e9cifiques et moins toxiques.<\/p>

Par exemple, les aptam\u00e8res sont \u00e9tudi\u00e9s pour cibler les r\u00e9cepteurs cellulaires impliqu\u00e9s dans le \ncancer ou les maladies auto-immunes. En outre, les aptam\u00e8res peuvent \u00eatre utilis\u00e9s pour d\u00e9livrer \ndes m\u00e9dicaments directement aux cellules cibles, minimisant ainsi les effets secondaires \nind\u00e9sirables.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\tQuelles sont les applications des aptam\u00e8res en m\u00e9decine ?<\/a>\n\t\t\t\t\t<\/div>\n\n\t\t\t\t\t

D\u00e9tection de petites mol\u00e9cules en m\u00e9decine et dans l'environnement<\/strong><\/p>

– Companion test
– Point of care or in the field analysis
– Food safety
– Pollution analysis<\/p>

Applications diagnostiques<\/strong><\/p>

Surveillance des m\u00e9tabolites \nD\u00e9tection de biomarqueurs<\/p>

Th\u00e9rapie avec les aptam\u00e8res<\/strong><\/p>

Aptamers and Novaptech are revolutionizing the field of medicine by offering the possibility
of developing targeted therapies.
This approach enables drugs to be delivered specifically to diseased cells or tissues, thereby
reducing the risk of adverse effects on healthy tissue. Aptamers can be designed to target
specific receptors on the surface of cancer cells, virus-infected cells or cells involved in
autoimmune diseases.
This high-precision drug delivery enhances treatment efficacy while reducing side effects.<\/p>

Les aptam\u00e8res dans le traitement du cancer<\/strong><\/p>

One of the applications of aptamers in medicine is in cancer treatment.
In this context, aptamers are designed to specifically target proteins overexpressed on the
surface of cancer cells, making them precise binding agents for the delivery of anti-cancer
drugs.
In addition, aptamers are used to block cancer cell growth signals or inhibit tumor
vascularization, representing a brake on cancer progression.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\tQuels sont les avantages des aptam\u00e8res ?<\/a>\n\t\t\t\t\t<\/div>\n\n\t\t\t\t\t

Les avantages des aptam\u00e8res sont nombreux, renfor\u00e7ant leur position de solution innovante \ndans le d\u00e9veloppement de nouvelles th\u00e9rapies, de sondes diagnostiques innovantes et d'outils \nanalytiques de pointe : \n1. Haute sp\u00e9cificit\u00e9 de liaison : les aptam\u00e8res sont con\u00e7us pour se lier tr\u00e8s sp\u00e9cifiquement \u00e0 \nleur cible, qu'il s'agisse d'une prot\u00e9ine, d'un virus ou d'une petite mol\u00e9cule. Cette sp\u00e9cificit\u00e9 \ngarantit que l'aptam\u00e8re n'interagit qu'avec la cible vis\u00e9e, minimisant ainsi les effets secondaires \nind\u00e9sirables. Cette pr\u00e9cision et cette affinit\u00e9 dans la liaison sont essentielles pour la cr\u00e9ation \nd'outils dans de nombreuses applications. \n2. Modifiabilit\u00e9 pour am\u00e9liorer leurs propri\u00e9t\u00e9s de liaison et leur fonction : les aptam\u00e8res \npeuvent \u00eatre modifi\u00e9s chimiquement pour am\u00e9liorer leur stabilit\u00e9 dans l'environnement \nbiologique, pour leur d\u00e9tection par leur conjugaison \u00e0 un colorant ou pour leur greffage sur un \nsupport. \n3. Moins immunog\u00e8nes que les anticorps : Contrairement aux anticorps, les aptam\u00e8res sont \npas ou peu immunog\u00e8nes, c'est-\u00e0-dire moins susceptibles de d\u00e9clencher une r\u00e9ponse \nimmunitaire dans l'organisme du patient. \nCette caract\u00e9ristique est particuli\u00e8rement importante lors de l'utilisation r\u00e9p\u00e9t\u00e9e d'un \nm\u00e9dicament, car une r\u00e9ponse immunitaire ind\u00e9sirable est susceptible d'entra\u00eener une r\u00e9duction \nde l'efficacit\u00e9 du traitement.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t<\/path><\/svg><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\tQuelles sont les perspectives d'avenir des aptam\u00e8res ?<\/a>\n\t\t\t\t\t<\/div>\n\n\t\t\t\t\t

Bien que les aptam\u00e8res aient d\u00e9j\u00e0 d\u00e9montr\u00e9 leur potentiel dans de nombreuses applications, il \nreste des d\u00e9fis \u00e0 relever dans le domaine de la recherche sur les aptam\u00e8res. \nLes chercheurs de Novaptech travaillent activement sur des modifications chimiques pour \nam\u00e9liorer leurs propri\u00e9t\u00e9s (affinit\u00e9, dur\u00e9e de vie...). \nUn autre d\u00e9fi auquel sont confront\u00e9es les \u00e9quipes de Novaptech est de d\u00e9velopper des m\u00e9thodes \nde criblage \u00e0 grande \u00e9chelle encore plus efficientes. Des efforts sont en cours pour automatiser \net optimiser le processus de s\u00e9lection SELEX afin de rendre l'identification des aptam\u00e8res plus \nefficace et moins on\u00e9reuse.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

What is an aptamer ? In the field of biotechnology, aptamers are attracting growing interest as they play a fundamental role in research and medicine. These short synthetic DNA or RNA oligonucleotides are designed to bind specifically to a given target.\u00a0Their interest lies in their ability to replace traditional antibodies and other affinity ligands.\u00a0This power offers significant advantages in terms of cost, stability and specificity.\u00a0Aptamers are small sequences of nucleic acid, DNA or RNA, selected in vitro for their ability to bind with high affinity to a specific target.\u00a0 In the Novaptech laboratory, aptamers are identified using a technique called SELEX (Systematic Evolution of Ligands by EXponential enrichment ) and can be adapted to recognize virtually any cell or molecule, be it protein, enzyme, drug or chemical compound. Discover the innovative Aptamer technology and its applications in various fields of biotechnology. Key advantages of Aptamers over Antibodies Aptamers are synthetic molecules that can be raised against any kind of target, including toxic or non-immunogenic ones. They bind their target with affinity similar or higher than antibodies. They are 10 fold smaller than antibodies and can be chemically-modified at will in a defined and precise way. They can be easily stored and delivered ; they can be reversibly heat-denatured and renatured. The sourcing is guaranteed with a total batch to batch reproducibility. They can be used under non physiological conditions for analytical purposes. They are non\u2013immunogenic and can be used in vivo. Novaptech’s aptamer services Any question ? Contact us Any question about selection service or assay development ? Please fill in the form below with relevant details for helping us providing an informative answer. Telephone or video call can be arranged. NDA can be signed, would you wish so. We will answer you as quickly as possible (generally less than 2 working days). Contact us Your scientific contact : Jean-Jacques Toulm\u00e9, PhD, CSO The importance of aptamers in research and medicine The selective binding capacity of aptamers has major implications in research and medicine.They are used in a variety of fields, from the specific detection of biomarkers to the design of targeted drugs.Aptamers are also of interest in analytical chemistry\/biochemistry for the quantitative detection of biomarkers or contaminants. Origin and discovery of aptamers The history of aptamers dates back to the 1990s, when researchers began exploring new alternatives to traditional antibodies for the recognition of targets. The discovery and development of aptamers has been hailed as a major breakthrough in biotechnology. Jack Szostack and Larry Gold were pioneers in this field, and in particular helped define the foundations of the SELEX technology. Comparison with other probes and ligands Compared to other ligands such as antibodies, aptamers offer several advantages. They are more stable, less costly to produce in large quantities, and their in vitro selection process is faster and more versatile. Aptamers can be developed to target specific molecules without the need for animal breeding or cell culture, making them particularly attractive for applications in research and medicine. How do aptamers work ? The aptamer selection process is the cornerstone of the creation of specific aptamers. It begins with the generation of an initial library of random oligonucleotides. This library contains a multitude of DNA or RNA sequences, each with a unique three-dimensional structure. This library is then subjected to selection cycles in which aptamers with a high affinity for the desired target are isolated. These cycles consist of a series of steps that include binding to the target, washing to remove unbound sequences, and finally, elution of target-bound aptamers. This process is repeated several times iteratively until the aptamers with high specificity and affinity are selected by Novaptech. The specific binding mechanism of aptamers to their target Aptamers use a variety of molecular interactions to bind to their target hydrogen bonds, electrostatic or\/and stacking interactions, between the aptamer nucleotides and the target residues. This interaction is highly specific, depending on the precise molecular characteristics of the target. Moreover, the aptamer three-dimensional conformation is essential for its specificity. The aptamer adopts a particular folded structure that perfectly matches the shape of the target. This ensures tight, specific binding. Examples of targets commonly studied with aptamers Aptamers have become the tools of choice for the recognition and study of a variety of biomolecular targets. Commonly studied examples include proteins, peptides, viruses, bacteria, cells, drugs and chemical compounds. For example, aptamers have been developed to specifically target proteins such as thrombin, EGFR (epidermal growth factor receptor) and vascular endothelial growth factor (VEGF). These aptamers are used in biomedical research for applications ranging from biomarker to drug analysis. What are the applications of aptamers in research ? Use of aptamers in molecular biology Today, aptamers are essential tools in molecular biology for studying various cellular and molecular processes. They can be used to analyze the structure and function of proteins by binding specifically to them. For example, aptamers are used to study protein-protein interactions, to target specific regions of proteins or to selectively inhibit their activity. These applications are essential for understanding the biological mechanisms underlying many diseases and for developing new therapies. Applications in diagnostics and detection Thanks to their high specificity, aptamers are able to detect specific biomarkers associated with diseases, such as proteins or metabolites. This capability enables Novaptech to create accurate, rapid and sensitive diagnostic tests for diseases such as cancer, viral infections or neurodegenerative diseases. Aptamers are also used to detect toxic substances or contaminants in the environment (pesticides, endocrine disruptors, drug residues\u2026). Aptamers in pharmacology In the pharmaceutical industry, aptamers are playing an increasingly important role in drug discovery. They can be designed to specifically target proteins involved in disease, paving the way for the development of more specific and less toxic drugs. For example, aptamers are being studied to target cell receptors involved in cancer or autoimmune diseases.\u00a0 In addition, aptamers can be used to deliver drugs directly to target cells, thus minimizing undesirable side effects. 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