{"id":6223,"date":"2026-05-06T09:58:43","date_gmt":"2026-05-06T09:58:43","guid":{"rendered":"https:\/\/agrosynapsis.com\/?p=6223"},"modified":"2026-05-06T09:58:47","modified_gmt":"2026-05-06T09:58:47","slug":"how-to-develop-a-pcr-detectable-ssr-marker-for-a-known-gene-or-trait","status":"publish","type":"post","link":"https:\/\/agrosynapsis.com\/es\/how-to-develop-a-pcr-detectable-ssr-marker-for-a-known-gene-or-trait\/","title":{"rendered":"How to Develop a PCR-Detectable SSR Marker for a Known Gene or Trait?"},"content":{"rendered":"<p>If a gene or QTL controlling an agronomic trait is already mapped and described in the literature, you don\u2019t always need SNP arrays or sequencing to use it in your breeding program.<br>If your lab already works with SSR markers, you can develop a gene-linked SSR using public resources.<br>Here\u2019s a practical, generic workflow \ud83d\udc47<br><br>1\ufe0f\u20e3 Start from a known gene or locus<br>Select a gene or genomic region already associated with a trait of interest (yield, resistance, quality, adaptation). This information typically comes from publications or public databases.<br><br>2\ufe0f\u20e3 Retrieve the genomic sequence around the locus<br>-Obtain the gene sequence from a public nucleotide database, like NCBI.<br>-Use this sequence to locate the gene in the reference genome of the species via a BLAST search.<br>-Select a high-confidence genomic hit (e.g. E-value \u2248 0).<br>-Once the genomic location is identified:<br>-Open the species\u2019 public genome browser.<br>-Locate the locus in the browser by using the coordinates generated by the BLAST analysis.<br>-Extract a genomic window around the locus (for example, ~50\u2013100 kb upstream and downstream) and download a decorated FASTA file.<br><br>This region will be used to search for SSRs linked to the gene.<br><br>3\ufe0f\u20e3 Identify SSRs and design primers (web-based tools)<br>&#8211; Use public, web-based SSR tools to scan the extracted genomic sequence.<br>Tools such as WebSat or MegaSSR are publicly available.<br>&#8211; Visit the tool of your\u00a0choice and submit the FASTA sequence.<br>&#8211; The program reports repeat length and position of the identified SSRs.<br>-Automatically design PCR primers flanking the repeat (or you can adjust the PCR parameters)<br><br>4\ufe0f\u20e3 Genotype and validate<br>Amplify the SSR using PCR and visualize allele size differences by gel or capillary electrophoresis. Validate the marker across contrasting genotypes to confirm polymorphism and linkage to the trait.<br><br>\u2705 Why this approach works<br>Uses existing genomic knowledge<br>Low-cost and PCR-based<br>Compatible with standard molecular labs<br>Very effective for marker-assisted selection<br><br>\ud83d\udca1 Want to learn more? If you found this tip useful and want to dive deeper into developing molecular markers\u00a0join our course: \u201cHow to Set a Marker-Assisted Selection Pipeline\u201d.<br>\ud83d\udc49 Discover the full program:<br><a href=\"https:\/\/lnkd.in\/esqGj4kD\">https:\/\/lnkd.in\/esqGj4kD<\/a><\/p>\n<div style=\"margin-top: 0px; margin-bottom: 0px;\" class=\"sharethis-inline-share-buttons\" ><\/div>","protected":false},"excerpt":{"rendered":"<p>Discover how to develop gene-linked SSR markers from published QTLs using public genomic resources\u2014without the need for SNP arrays or sequencing.<\/p>","protected":false},"author":2,"featured_media":6209,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[68],"tags":[],"class_list":["post-6223","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tips"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Develop a PCR-Detectable SSR Marker for a Known Gene or Trait? 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