{"id":223269,"date":"2024-10-30T14:51:51","date_gmt":"2024-10-30T14:51:51","guid":{"rendered":"https:\/\/namso-gen.co\/blog\/what-is-e-value-in-blast-search\/"},"modified":"2024-10-30T14:51:51","modified_gmt":"2024-10-30T14:51:51","slug":"what-is-e-value-in-blast-search","status":"publish","type":"post","link":"https:\/\/namso-gen.co\/blog\/what-is-e-value-in-blast-search\/","title":{"rendered":"What is E-value in blast search?"},"content":{"rendered":"<p>When performing a blast search, researchers are often interested in finding similarities between a query sequence and a large database of sequences. Blast search stands for Basic Local Alignment Search Tool and it is widely used in bioinformatics to compare biological sequences such as DNA, RNA, and proteins. One of the key factors in blast search results is the E-value.<\/p>\n<p><strong>The E-value in blast search is a statistical measure of the expected number of random matches that could occur by chance when comparing a query sequence against a database.<\/strong> It represents the probability of obtaining a match as good or better than the one observed, purely by chance.<\/p>\n<p>Typically, lower E-values indicate more significant matches, suggesting a higher likelihood that the observed similarity between the query and a sequence in the database is due to actual biological relationships rather than random chance.<\/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-is-e-value-in-blast-search\/#FAQs_about_E-value_in_blast_search\" title=\"FAQs about E-value in blast search:\">FAQs about E-value in blast search:<\/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-is-e-value-in-blast-search\/#1_How_is_the_E-value_calculated_in_a_blast_search\" title=\"1. How is the E-value calculated in a blast search?\">1. How is the E-value calculated in a blast search?<\/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-is-e-value-in-blast-search\/#2_Can_the_E-value_be_zero\" title=\"2. Can the E-value be zero?\">2. Can the E-value be zero?<\/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-is-e-value-in-blast-search\/#3_Is_a_lower_E-value_always_better\" title=\"3. Is a lower E-value always better?\">3. 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-5\" href=\"https:\/\/namso-gen.co\/blog\/what-is-e-value-in-blast-search\/#4_How_is_the_E-value_interpreted\" title=\"4. How is the E-value interpreted?\">4. How is the E-value interpreted?<\/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-is-e-value-in-blast-search\/#5_What_is_the_significance_threshold_for_E-values\" title=\"5. What is the significance threshold for E-values?\">5. What is the significance threshold for E-values?<\/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-is-e-value-in-blast-search\/#6_Can_E-values_be_negative\" title=\"6. Can E-values be negative?\">6. Can E-values be negative?<\/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-is-e-value-in-blast-search\/#7_How_can_E-values_help_in_identifying_homologous_sequences\" title=\"7. How can E-values help in identifying homologous sequences?\">7. How can E-values help in identifying homologous sequences?<\/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-is-e-value-in-blast-search\/#8_Are_E-values_affected_by_the_size_of_the_database_being_searched\" title=\"8. Are E-values affected by the size of the database being searched?\">8. Are E-values affected by the size of the database being searched?<\/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-is-e-value-in-blast-search\/#9_How_can_I_determine_if_an_E-value_is_significant\" title=\"9. How can I determine if an E-value is significant?\">9. How can I determine if an E-value is significant?<\/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-is-e-value-in-blast-search\/#10_Can_different_blast_programs_produce_different_E-values_for_the_same_query\" title=\"10. Can different blast programs produce different E-values for the same query?\">10. Can different blast programs produce different E-values for the same query?<\/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-is-e-value-in-blast-search\/#11_Are_E-values_affected_by_the_length_of_the_query_sequence\" title=\"11. Are E-values affected by the length of the query sequence?\">11. Are E-values affected by the length of the query sequence?<\/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-is-e-value-in-blast-search\/#12_How_can_I_optimize_my_blast_search_to_get_better_E-values\" title=\"12. How can I optimize my blast search to get better E-values?\">12. How can I optimize my blast search to get better E-values?<\/a><\/li><\/ul><\/nav><\/div>\n<h3><span class=\"ez-toc-section\" id=\"FAQs_about_E-value_in_blast_search\"><\/span>FAQs about E-value in blast search:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h3><span class=\"ez-toc-section\" id=\"1_How_is_the_E-value_calculated_in_a_blast_search\"><\/span>1. How is the E-value calculated in a blast search?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>The E-value is calculated based on the size of the database being searched, the length of the query sequence, and the quality of the matches found.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"2_Can_the_E-value_be_zero\"><\/span>2. Can the E-value be zero?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>No, the E-value cannot be zero. A value close to zero indicates a highly significant match.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"3_Is_a_lower_E-value_always_better\"><\/span>3. Is a lower E-value always better?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>Yes, a lower E-value indicates a more significant match. However, the biological relevance of the match should also be considered.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"4_How_is_the_E-value_interpreted\"><\/span>4. How is the E-value interpreted?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>The E-value can be interpreted as the number of matches you would expect to find by chance in the database of sequences if no significant similarity exists.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"5_What_is_the_significance_threshold_for_E-values\"><\/span>5. What is the significance threshold for E-values?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>The significance threshold for E-values commonly used in bioinformatics is 0.01. Matches with E-values below this threshold are considered statistically significant.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"6_Can_E-values_be_negative\"><\/span>6. Can E-values be negative?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>No, E-values cannot be negative.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"7_How_can_E-values_help_in_identifying_homologous_sequences\"><\/span>7. How can E-values help in identifying homologous sequences?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>E-values help in identifying homologous sequences by providing an estimate of the probability that the match between the query sequence and a database sequence is due to random chance.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"8_Are_E-values_affected_by_the_size_of_the_database_being_searched\"><\/span>8. Are E-values affected by the size of the database being searched?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>Yes, larger databases tend to have higher E-values because the probability of finding random matches increases with more sequences.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"9_How_can_I_determine_if_an_E-value_is_significant\"><\/span>9. How can I determine if an E-value is significant?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>Generally, E-values smaller than 0.01 are considered statistically significant, but the significance depends on the specific context of the analysis and the desired level of stringency.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"10_Can_different_blast_programs_produce_different_E-values_for_the_same_query\"><\/span>10. Can different blast programs produce different E-values for the same query?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>Yes, different blast programs may use different algorithms and scoring schemes, which can lead to variations in E-values for the same query.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"11_Are_E-values_affected_by_the_length_of_the_query_sequence\"><\/span>11. Are E-values affected by the length of the query sequence?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>Yes, longer query sequences tend to have lower E-values because longer sequences have a higher chance of generating a significant match.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"12_How_can_I_optimize_my_blast_search_to_get_better_E-values\"><\/span>12. How can I optimize my blast search to get better E-values?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><\/p>\n<p>Optimizing blast search can involve adjusting parameters such as word size, gap penalties, and substitution matrices to improve the probability of finding significant matches and obtaining lower E-values.<\/p>\n<p>In conclusion, the E-value in blast search is a crucial statistical measure that helps researchers determine the significance of the matches found between a query sequence and a database. By considering the E-value, researchers can assess the likelihood of a match being due to chance or an actual biological relationship, aiding in the interpretation and analysis of blast search results.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>When performing a blast search, researchers are often interested in finding similarities between a query sequence and a large database of sequences. Blast search stands for Basic Local Alignment Search Tool and it is widely used in bioinformatics to compare biological sequences such as DNA, RNA, and proteins. One of the key factors in blast &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"What is E-value in blast search?\" class=\"read-more button\" href=\"https:\/\/namso-gen.co\/blog\/what-is-e-value-in-blast-search\/#more-223269\">Read more<span class=\"screen-reader-text\">What is E-value in blast search?<\/span><\/a><\/p>\n","protected":false},"author":56,"featured_media":107420,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86279],"tags":[],"class_list":["post-223269","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 is E-value in blast search?<\/title>\n<meta name=\"description\" content=\"When performing a blast search, researchers are often interested in finding similarities between a query sequence and a large database of sequences. 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