{"id":258251,"date":"2024-04-11T00:43:22","date_gmt":"2024-04-11T00:43:22","guid":{"rendered":"https:\/\/namso-gen.co\/blog\/?p=258251"},"modified":"2024-04-11T00:43:22","modified_gmt":"2024-04-11T00:43:22","slug":"what-does-e-value-mean-in-blast","status":"publish","type":"post","link":"https:\/\/namso-gen.co\/blog\/what-does-e-value-mean-in-blast\/","title":{"rendered":"What does e value mean in BLAST?"},"content":{"rendered":"<p>The e value, or expect value, in BLAST (Basic Local Alignment Search Tool), is a statistical measure that indicates the likelihood of obtaining a match to a specific sequence by chance. It represents the number of alignments expected to occur at random with a given score or higher.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_62 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/namso-gen.co\/blog\/what-does-e-value-mean-in-blast\/#What_is_BLAST\" title=\"What is BLAST?\">What is BLAST?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/namso-gen.co\/blog\/what-does-e-value-mean-in-blast\/#How_does_BLAST_work\" title=\"How does BLAST work?\">How does BLAST work?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/namso-gen.co\/blog\/what-does-e-value-mean-in-blast\/#How_is_the_e_value_calculated_in_BLAST\" title=\"How is the e value calculated in BLAST?\">How is the e value calculated in BLAST?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/namso-gen.co\/blog\/what-does-e-value-mean-in-blast\/#Why_is_the_e_value_important_in_BLAST\" title=\"Why is the e value important in BLAST?\">Why is the e value important in BLAST?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/namso-gen.co\/blog\/what-does-e-value-mean-in-blast\/#What_does_a_low_e_value_indicate\" title=\"What does a low e value indicate?\">What does a low e value indicate?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/namso-gen.co\/blog\/what-does-e-value-mean-in-blast\/#What_does_a_high_e_value_indicate\" title=\"What does a high e value indicate?\">What does a high e value indicate?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/namso-gen.co\/blog\/what-does-e-value-mean-in-blast\/#What_is_the_threshold_for_a_significant_e_value\" title=\"What is the threshold for a significant e value?\">What is the threshold for a significant e value?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/namso-gen.co\/blog\/what-does-e-value-mean-in-blast\/#How_can_the_e_value_be_interpreted\" title=\"How can the e value be interpreted?\">How can the e value be interpreted?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/namso-gen.co\/blog\/what-does-e-value-mean-in-blast\/#How_does_the_e_value_influence_the_BLAST_results\" title=\"How does the e value influence the BLAST results?\">How does the e value influence the BLAST results?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/namso-gen.co\/blog\/what-does-e-value-mean-in-blast\/#Can_the_e_value_be_used_to_estimate_sequence_similarity\" title=\"Can the e value be used to estimate sequence similarity?\">Can the e value be used to estimate sequence similarity?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/namso-gen.co\/blog\/what-does-e-value-mean-in-blast\/#Is_a_lower_e_value_always_better\" title=\"Is a lower e value always better?\">Is a lower e value always better?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/namso-gen.co\/blog\/what-does-e-value-mean-in-blast\/#Can_the_e_value_be_used_to_compare_different_BLAST_searches\" title=\"Can the e value be used to compare different BLAST searches?\">Can the e value be used to compare different BLAST searches?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/namso-gen.co\/blog\/what-does-e-value-mean-in-blast\/#What_are_the_limitations_of_the_e_value\" title=\"What are the limitations of the e value?\">What are the limitations of the e value?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/namso-gen.co\/blog\/what-does-e-value-mean-in-blast\/#Can_the_e_value_be_manipulated\" title=\"Can the e value be manipulated?\">Can the e value be manipulated?<\/a><\/li><\/ul><\/nav><\/div>\n<h3><span class=\"ez-toc-section\" id=\"What_is_BLAST\"><\/span>What is BLAST?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nBLAST is a widely used bioinformatics tool that helps researchers compare nucleotide or protein sequences against a database of known sequences to identify similarities and infer functional and evolutionary relationships.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_does_BLAST_work\"><\/span>How does BLAST work?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nBLAST compares a query sequence to a database of sequences by breaking the query sequence into smaller pieces called words, searching for these words in the database, and then extending the matches into longer alignments.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_is_the_e_value_calculated_in_BLAST\"><\/span>How is the e value calculated in BLAST?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nThe e value is calculated based on the length of the query sequence, the size of the database, and the statistical significance threshold. It can be interpreted as the number of matches with a score equal to or better than the observed score that would be expected to occur by chance.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Why_is_the_e_value_important_in_BLAST\"><\/span>Why is the e value important in BLAST?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nThe e value helps researchers determine the significance of a sequence similarity. It allows them to distinguish between matches that are likely due to common ancestry and matches that could occur randomly.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_does_a_low_e_value_indicate\"><\/span>What does a low e value indicate?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nA low e value indicates a higher statistical significance, implying that the similarity between the query sequence and the database sequence is more likely to be due to a true biological relationship.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_does_a_high_e_value_indicate\"><\/span>What does a high e value indicate?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nA high e value indicates a lower statistical significance. It suggests that any similarity observed between the query and database sequences could be due to chance, rather than indicating a true biological relationship.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_is_the_threshold_for_a_significant_e_value\"><\/span>What is the threshold for a significant e value?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nThe threshold for a significant e value depends on the specific analysis and the scientific context. In general, a smaller e value (e.g., less than 0.01 or 0.05) is considered to be more significant.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_can_the_e_value_be_interpreted\"><\/span>How can the e value be interpreted?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nThe e value can be interpreted as the expected number of matches with a score equal to or better than the observed score that would occur randomly in a database of the same size.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_does_the_e_value_influence_the_BLAST_results\"><\/span>How does the e value influence the BLAST results?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nWhen performing a BLAST search, the e value is used to rank and filter the reported matches. Lower e values indicate more reliable and significant matches, whereas higher e values suggest matches that are less likely to be biologically meaningful.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_the_e_value_be_used_to_estimate_sequence_similarity\"><\/span>Can the e value be used to estimate sequence similarity?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nThe e value is not a direct measure of sequence similarity, but rather a measure of the statistical significance of the match. Sequence similarity can be further assessed by examining other measures, such as the alignment score or percent identity.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Is_a_lower_e_value_always_better\"><\/span>Is a lower e value always better?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nWhile a lower e value generally indicates a more significant match, it is essential to consider other factors, such as the alignment score and alignment length, to evaluate the biological relevance of the matches.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_the_e_value_be_used_to_compare_different_BLAST_searches\"><\/span>Can the e value be used to compare different BLAST searches?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nThe e value is only meaningful within a specific BLAST search. It cannot be directly compared between different searches with distinct queries or databases.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_are_the_limitations_of_the_e_value\"><\/span>What are the limitations of the e value?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nThe e value does not account for the size and composition of the database, potential biases, and evolutionary divergence. Therefore, it is crucial to interpret the e value alongside other parameters and biological knowledge.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_the_e_value_be_manipulated\"><\/span>Can the e value be manipulated?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nThe e value cannot be directly manipulated, as it is based on statistical calculations. However, researchers can choose different statistical thresholds or modify the database size to influence the reported e values.<\/p>\n<p>In conclusion, the e value in BLAST is a statistical measure that provides an indication of the likelihood of obtaining a sequence match by chance. It helps researchers assess the statistical significance of sequence alignments and aids in the interpretation of BLAST results. Remember, a lower e value generally implies a more significant match, but it is crucial to consider other factors to evaluate the biological relevance of the matches.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The e value, or expect value, in BLAST (Basic Local Alignment Search Tool), is a statistical measure that indicates the likelihood of obtaining a match to a specific sequence by chance. It represents the number of alignments expected to occur at random with a given score or higher. What is BLAST? BLAST is a widely &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"What does e value mean in BLAST?\" class=\"read-more button\" href=\"https:\/\/namso-gen.co\/blog\/what-does-e-value-mean-in-blast\/#more-258251\">Read more<span class=\"screen-reader-text\">What does e value mean in BLAST?<\/span><\/a><\/p>\n","protected":false},"author":65,"featured_media":107420,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86279],"tags":[],"class_list":["post-258251","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-learn","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What does e value mean in BLAST?<\/title>\n<meta name=\"description\" content=\"The e value, or expect value, in BLAST (Basic Local Alignment Search Tool), is a statistical measure that indicates the likelihood of obtaining a match to\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/namso-gen.co\/blog\/what-does-e-value-mean-in-blast\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What does e value mean in BLAST?\" \/>\n<meta property=\"og:description\" content=\"The e value, or expect value, in BLAST (Basic Local Alignment Search Tool), is a statistical measure that indicates the likelihood of obtaining a match to\" \/>\n<meta property=\"og:url\" content=\"https:\/\/namso-gen.co\/blog\/what-does-e-value-mean-in-blast\/\" \/>\n<meta property=\"og:site_name\" content=\"Namso Gen Blog - 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