{"id":258435,"date":"2024-05-09T02:44:52","date_gmt":"2024-05-09T02:44:52","guid":{"rendered":"https:\/\/namso-gen.co\/blog\/?p=258435"},"modified":"2024-05-09T02:44:52","modified_gmt":"2024-05-09T02:44:52","slug":"what-does-the-e-value-in-blast-mean","status":"publish","type":"post","link":"https:\/\/namso-gen.co\/blog\/what-does-the-e-value-in-blast-mean\/","title":{"rendered":"What does the E value in BLAST mean?"},"content":{"rendered":"<p>BLAST (Basic Local Alignment Search Tool) is a widely used bioinformatics program for comparing DNA or protein sequences against a database. One crucial metric provided by BLAST is the E value, which plays a vital role in determining the significance of sequence similarity results.<\/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-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/namso-gen.co\/blog\/what-does-the-e-value-in-blast-mean\/#The_meaning_of_the_E_value_in_BLAST\" title=\"The meaning of the E value in BLAST\">The meaning of the E value in BLAST<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/namso-gen.co\/blog\/what-does-the-e-value-in-blast-mean\/#Frequently_Asked_Questions_FAQs\" title=\"Frequently Asked Questions (FAQs)\">Frequently Asked Questions (FAQs)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/namso-gen.co\/blog\/what-does-the-e-value-in-blast-mean\/#Q1_How_do_I_interpret_the_E_value_in_BLAST\" title=\"Q1: How do I interpret the E value in BLAST?\">Q1: How do I interpret the E value 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-the-e-value-in-blast-mean\/#Q2_Can_the_E_value_be_zero\" title=\"Q2: Can the E value be zero?\">Q2: 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-5\" href=\"https:\/\/namso-gen.co\/blog\/what-does-the-e-value-in-blast-mean\/#Q3_What_is_considered_a_good_E_value\" title=\"Q3: What is considered a good E value?\">Q3: What is considered a good E value?<\/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-the-e-value-in-blast-mean\/#Q4_Can_the_E_value_be_greater_than_1\" title=\"Q4: Can the E value be greater than 1?\">Q4: Can the E value be greater than 1?<\/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-the-e-value-in-blast-mean\/#Q5_Is_the_E_value_the_only_factor_to_consider_in_sequence_similarity_searches\" title=\"Q5: Is the E value the only factor to consider in sequence similarity searches?\">Q5: Is the E value the only factor to consider in sequence similarity searches?<\/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-the-e-value-in-blast-mean\/#Q6_What_happens_if_my_E_value_is_high\" title=\"Q6: What happens if my E value is high?\">Q6: What happens if my E value is high?<\/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-the-e-value-in-blast-mean\/#Q7_Why_is_it_important_to_consider_the_E_value_in_sequence_comparisons\" title=\"Q7: Why is it important to consider the E value in sequence comparisons?\">Q7: Why is it important to consider the E value in sequence comparisons?<\/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-the-e-value-in-blast-mean\/#Q8_Can_I_compare_E_values_from_different_BLAST_searches\" title=\"Q8: Can I compare E values from different BLAST searches?\">Q8: Can I compare E values from different BLAST searches?<\/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-the-e-value-in-blast-mean\/#Q9_Can_I_compare_E_values_between_different_types_of_sequences_eg_DNA_and_protein\" title=\"Q9: Can I compare E values between different types of sequences (e.g., DNA and protein)?\">Q9: Can I compare E values between different types of sequences (e.g., DNA and protein)?<\/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-the-e-value-in-blast-mean\/#Q10_Is_a_smaller_E_value_more_significant_than_a_larger_E_value\" title=\"Q10: Is a smaller E value more significant than a larger E value?\">Q10: Is a smaller E value more significant than a larger E value?<\/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-the-e-value-in-blast-mean\/#Q11_Can_I_use_the_E_value_alone_to_determine_if_two_sequences_are_homologous\" title=\"Q11: Can I use the E value alone to determine if two sequences are homologous?\">Q11: Can I use the E value alone to determine if two sequences are homologous?<\/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-the-e-value-in-blast-mean\/#Q12_What_if_I_obtain_no_significant_hits_with_low_E_values\" title=\"Q12: What if I obtain no significant hits with low E values?\">Q12: What if I obtain no significant hits with low E values?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"The_meaning_of_the_E_value_in_BLAST\"><\/span>The meaning of the E value in BLAST<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>**The E value, also known as the Expect value, in BLAST is a statistical parameter that estimates the number of occurrences of matches with similar scores by chance alone, in a database of the given size.**<\/p>\n<p>In simpler terms, the E value represents the probability of obtaining a hit (sequence similarity match) with a similar or better score purely by random chance, rather than due to actual biological similarity. A lower E value signifies a more significant match, indicating a higher probability of true biological relevance.<\/p>\n<p>The E value is calculated based on the size of the database being searched and the score of the alignment. A smaller E value suggests a more stringent significance threshold, while a larger E value indicates a greater tolerance for random matches.<\/p>\n<p>To better understand the significance of an E value, it helps to consider an example. If a matching sequence has an E value of 0.01, it means that we would expect to find a similar match by chance alone once in every 100 searches. In contrast, an E value of 0.0001 means we would only expect such a match once in every 10,000 searches.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions_FAQs\"><\/span>Frequently Asked Questions (FAQs)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Q1_How_do_I_interpret_the_E_value_in_BLAST\"><\/span>Q1: How do I interpret the E value in BLAST?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nA1: A lower E value suggests a stronger indication of a true biological match.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q2_Can_the_E_value_be_zero\"><\/span>Q2: Can the E value be zero?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nA2: No, the E value cannot be exactly zero, but it can be very close to zero, indicating an extremely significant match.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q3_What_is_considered_a_good_E_value\"><\/span>Q3: What is considered a good E value?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nA3: A good E value depends on various factors, including the size of the database being searched and the specific research question. Generally, an E value below 0.01 is often considered noteworthy.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q4_Can_the_E_value_be_greater_than_1\"><\/span>Q4: Can the E value be greater than 1?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nA4: Yes, the E value can be greater than 1, especially when searching small databases. However, a higher E value implies a higher chance of obtaining similar scores by chance and indicates a less significant match.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q5_Is_the_E_value_the_only_factor_to_consider_in_sequence_similarity_searches\"><\/span>Q5: Is the E value the only factor to consider in sequence similarity searches?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nA5: No, the E value is important but not the sole factor. Factors like alignment length, coverage, and sequence identity also contribute to determining the significance of a match.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q6_What_happens_if_my_E_value_is_high\"><\/span>Q6: What happens if my E value is high?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nA6: A high E value implies a higher likelihood of the match occurring by chance. Consider refining your search parameters or exploring additional analyses to confirm the significance of the match.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q7_Why_is_it_important_to_consider_the_E_value_in_sequence_comparisons\"><\/span>Q7: Why is it important to consider the E value in sequence comparisons?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nA7: The E value helps researchers assess the statistical significance of sequence similarity results and differentiate between matches that are likely due to chance and those with potential biological relevance.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q8_Can_I_compare_E_values_from_different_BLAST_searches\"><\/span>Q8: Can I compare E values from different BLAST searches?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nA8: It is generally not recommended to directly compare E values from different BLAST searches, as they are highly dependent on the size of the database searched.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q9_Can_I_compare_E_values_between_different_types_of_sequences_eg_DNA_and_protein\"><\/span>Q9: Can I compare E values between different types of sequences (e.g., DNA and protein)?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nA9: No, E values are not comparable between different types of sequences, as they are based on different scoring systems and statistical models.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q10_Is_a_smaller_E_value_more_significant_than_a_larger_E_value\"><\/span>Q10: Is a smaller E value more significant than a larger E value?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nA10: Yes, a smaller E value indicates a more significant match, with a lower likelihood of occurring by chance.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q11_Can_I_use_the_E_value_alone_to_determine_if_two_sequences_are_homologous\"><\/span>Q11: Can I use the E value alone to determine if two sequences are homologous?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nA11: No, the E value is just one factor to consider. Additional analyses, such as examining alignment length and sequence identity, are necessary to support the conclusion of homology.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q12_What_if_I_obtain_no_significant_hits_with_low_E_values\"><\/span>Q12: What if I obtain no significant hits with low E values?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nA12: If you obtain no significant hits with low E values, it may indicate that your query sequence is dissimilar to any sequences in the database searched. Consider adjusting search parameters or utilizing alternative algorithms or databases.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>BLAST (Basic Local Alignment Search Tool) is a widely used bioinformatics program for comparing DNA or protein sequences against a database. One crucial metric provided by BLAST is the E value, which plays a vital role in determining the significance of sequence similarity results. The meaning of the E value in BLAST **The E value, &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"What does the E value in BLAST mean?\" class=\"read-more button\" href=\"https:\/\/namso-gen.co\/blog\/what-does-the-e-value-in-blast-mean\/#more-258435\">Read more<span class=\"screen-reader-text\">What does the E value in BLAST mean?<\/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-258435","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 the E value in BLAST mean?<\/title>\n<meta name=\"description\" content=\"BLAST (Basic Local Alignment Search Tool) is a widely used bioinformatics program for comparing DNA or protein sequences against a database. 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