Track lists

A Track List (Image trackset_16_n_p) allows multiple tracks based on a compatible reference genome to be seen in a single view, supporting comparative analysis (figure 27.3).

A track list consists of references to tracks, which are then shown together in the View area. Track lists do not directly contain the track data. Rather, they contain references to the relevant track elements. When a track referred to by a track list cannot be found, the text "Unresolved track" is displayed for that track in the track list.

See the end of this section for information relating to copying track lists.

Creating track lists

Track lists can be created in several ways:

Image genomebrowser1
Figure 27.3: A track list referring to 3 tracks. By zooming into a given location, the details of the read mapping (top track), variants(middle track) and overlapping CDS annotations (bottom track) can be investigated.

Different views of the data are available using the icons at the bottom of an open track list. Of note is the Chromosome Table view (Image track_list_tableview_16_h_p), which provides a summary of the data contained in the tracks referred to by the track list. The table in this view contains one row per chromosome, and one column per track in the track list.

Working with tracks in track lists

Tracks can be re-ordered within track lists by dragging them up and down in the open view. Tracks can also be easily added and removed. In addition, linked views of selected tracks can be opened, allowing quick navigation to areas of interest in the genome.

Right-clicking on any of the tracks opens up a context menu (figure 27.4). The options presented vary, depending on the track type. The following options relating to track organization are commonly shown:

Image organizetracks
Figure 27.4: Right-click on a track to reveal options relating to handling and organize tracks within the track list.

Image trackfromlist_intableview
Figure 27.5: A linked table view of a track is opened by right-clicking on the track in the track list and then selecting "Open This Track".

Making copies of track lists

Track lists can be copied like any other data element (see Moving and copying elements). If a track list is copied by itself, then the new copy will refer to the same tracks as the original.

To copy a track list and have the new copy refer to new copies of the tracks, copy the track list and all the tracks it refers to in a single copy action. If a subset of the tracks referred to are copied, then references to the copied tracks are updated, while references to the original tracks are maintained for those not copied.