| Titre : | GENOMIC ANALYSIS OF XBB VARIANT OF SARS-CoV-2 IN MOROCCO | | Type de document : | thèse | | Auteurs : | ELAMINE HANANE, Auteur | | Année de publication : | 2023 | | Langues : | Anglais (eng) | | Mots-clés : | SARS-CoV-2 XBB variant Genomic analysis Phylogenetic analysis substitutions molecular mechanisms variant XBB analyse génomique analyse phylogénétique substitutions mécanismes moléculaires فيروس سارس-كوف،2- المتحور إكس بي بي، تحليل الجينوم تحليل فيلوجيني استبداالت آليات
جزئية | | Résumé : | The global spread of SARS-CoV-2 variants has created significant public health challenges,
prompting the need for vigilant surveillance and monitoring of emerging mutations. In this
study, we conducted a comprehensive genomic analysis of four sequences of the XBB variant
of SARS-CoV-2, classified as a variant of concern by the World Health Organization (WHO),
collected in Morocco and sequenced in Medbiotech laboratory using the Ion S5 System. Our
aim was to characterize the mutational profile of this variant in Morocco, and investigate its
possible sources of introduction by a comparative analysis with 140 worldwide sequences
retrieved from GISAID. Through our genomic analysis, we identified common mutations
between the four Moroccan sequences and the 140 worldwide sequences, Our analysis revealed
transmissions of the synonymous mutation C14178T/T237T and the C14362T/I298I mutations
in the NSP12b, as well as the synonymous mutation C22792A/I410I in the S protein from three
Moroccan XBB sequences to the USA sequences, in addition to the introduction of the
synonymous mutations C5869T/Y1050Y in the NSP3, C16887T/Y217Y in the NSP13, and the
non-synonymous mutation T76I in the S protein from the USA to a Moroccan sequence. Also,
we identified the following unique non-synonymous mutations in the four Moroccan
sequences, in the Spike protein twelve substitutions in the Spike protein (F86S, N87K, D88G,
G89V, V90F, T430A, C432S, V433L, I434K, W436K, N437A, and S438T), three deletions
(P85-, F429-, S494-), two deletion-frame-shift mutations (I434-, G431-), and one insertion (-
90H), deletion in the membrane protein (F28-), as well as substitutions in NSP3 (T942I) and
NSP16 (I219L), highlighting the presence of genetic diversity within the Moroccan sequences.
Furthermore, through prediction analysis, we assessed the impact of the observed unique
substitutions in the spike protein in the Moroccan XBB sequences, we found that they
significantly affect the structure and potentially can affect the function of the protein. | | Numéro (Thèse ou Mémoire) : | MM0162023 | | Président : | AANNIZ Tarik | | Directeur : | OUADGHIRI Mouna | | Juge : | LOUATI Sara |
GENOMIC ANALYSIS OF XBB VARIANT OF SARS-CoV-2 IN MOROCCO [thèse] / ELAMINE HANANE, Auteur . - 2023. Langues : Anglais ( eng) | Mots-clés : | SARS-CoV-2 XBB variant Genomic analysis Phylogenetic analysis substitutions molecular mechanisms variant XBB analyse génomique analyse phylogénétique substitutions mécanismes moléculaires فيروس سارس-كوف،2- المتحور إكس بي بي، تحليل الجينوم تحليل فيلوجيني استبداالت آليات
جزئية | | Résumé : | The global spread of SARS-CoV-2 variants has created significant public health challenges,
prompting the need for vigilant surveillance and monitoring of emerging mutations. In this
study, we conducted a comprehensive genomic analysis of four sequences of the XBB variant
of SARS-CoV-2, classified as a variant of concern by the World Health Organization (WHO),
collected in Morocco and sequenced in Medbiotech laboratory using the Ion S5 System. Our
aim was to characterize the mutational profile of this variant in Morocco, and investigate its
possible sources of introduction by a comparative analysis with 140 worldwide sequences
retrieved from GISAID. Through our genomic analysis, we identified common mutations
between the four Moroccan sequences and the 140 worldwide sequences, Our analysis revealed
transmissions of the synonymous mutation C14178T/T237T and the C14362T/I298I mutations
in the NSP12b, as well as the synonymous mutation C22792A/I410I in the S protein from three
Moroccan XBB sequences to the USA sequences, in addition to the introduction of the
synonymous mutations C5869T/Y1050Y in the NSP3, C16887T/Y217Y in the NSP13, and the
non-synonymous mutation T76I in the S protein from the USA to a Moroccan sequence. Also,
we identified the following unique non-synonymous mutations in the four Moroccan
sequences, in the Spike protein twelve substitutions in the Spike protein (F86S, N87K, D88G,
G89V, V90F, T430A, C432S, V433L, I434K, W436K, N437A, and S438T), three deletions
(P85-, F429-, S494-), two deletion-frame-shift mutations (I434-, G431-), and one insertion (-
90H), deletion in the membrane protein (F28-), as well as substitutions in NSP3 (T942I) and
NSP16 (I219L), highlighting the presence of genetic diversity within the Moroccan sequences.
Furthermore, through prediction analysis, we assessed the impact of the observed unique
substitutions in the spike protein in the Moroccan XBB sequences, we found that they
significantly affect the structure and potentially can affect the function of the protein. | | Numéro (Thèse ou Mémoire) : | MM0162023 | | Président : | AANNIZ Tarik | | Directeur : | OUADGHIRI Mouna | | Juge : | LOUATI Sara |
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