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Sequence Improvement

A Simple Drosophila Fosmid

This fosmid from Drosophila virilis assembles into a single contig (a green clone). In this exercise, students will need to identify regions in the assembly where additional data is needed and design additional sequencing reactions to bring the contig up to quality standards.

The D. grimshawi dot chromosome

This PowerPoint presentation explains our strategy, detailing the source of the raw sequence data for the D. grimshawi dot chromosome.

Workflow to Resolve Misassembly

A flowchart that illustrates the key decisions and strategies when dealing with misassemblies that are caused by collapsed repeats.

Common Misassembly Protocols

This document describes a list of protocols that are frequently used to resolve misassembly.

GEP Misassembly Tools User Guide

This document describes the list of tools developed by the GEP to facilitate incorporation of additional reads from the NCBI Trace Archive into a sequence improvement project. This document shows how to install the tools, and illustrates their use in two case studies (walkthroughs) of challenging fosmid assemblies.

Identifying and Sorting Tandem Duplications and an Inverted Repeat

Developed by the professional finishers at the WU Genome Institute (Holly Kotkiewicz and Jennifer Hodges), this walkthrough illustrates how you can use high quality discrepancies, Miniassembly, and cross_match to resolve a major misassembly in a D. ananassae project.

The Finishing Report

This document describes the final student written and oral reports required as part of the Bio 4342 course as taught at WU. In these reports, students describe their work on their fosmid, the challenges they encounter, and the solutions they developed to resolve these challenges.

Finishing Checklist

Students should complete all items on this checklist before submitting the project back to the GEP.

Strategies for Finishing Hybrid Assemblies

This document contains advice on the strategies students can use to resolve common problems they may encounter during sequence improvement.

Calling Additional Reads

Students will typically need to request additional sequencing reactions in order to improve the quality of an assembly. This document describes some of the key considerations that students should keep in mind when they design oligonucleotide primers.