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The VT GAL4, LexA, and split-GAL4 driver line collections for targeted expression in the Drosophila nervous system

László Tirián, Barry J. DicksoniD

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Abstract

In studying the cellular interactions within complex tissues, it is extremely valuable to be able to reproducibly and flexibly target transgene expression to restricted subsets of cells. This approach is particularly valuable in studying the nervous system, with its bewildering diversity of neuronal cell types. We report here the generation of over 18,000 driver lines (the VT collection) that exploit the GAL4, LexA, and split-GAL4 systems to express transgenes in distinct and highly specific cell types in Drosophila. We document the expression patterns of over 14,000 of these lines in the adult male brain.

In-depth summary

Claude Sonnet 4.6 · max effort · 8 Nov 2026 · from the full text of version 1 (5 Oct 2017) · CC BY-NC 4.0

A collection of over 18,000 Drosophila driver lines (GAL4, LexA, split-GAL4) was built, with adult male brain expression imaged for over 14,000 lines.

Dissecting diverse neuronal cell types needs reproducible, restricted transgene expression, but single GAL4 or LexA lines rarely isolate one cell type. The VT collection adds enhancer-based GAL4, LexA and split-GAL4 lines compatible with the Janelia collections, plus brain images for choosing intersections.

Key results

  1. SuggestedOf 8,166 enhancer-GAL4 lines generated, 8,081 were imaged in adult male brains with a GFP reporter, and the authors state that most showed reproducible expression in restricted neuronal subsets.

    8,166 VT GAL4 lines generated (predicted ~2kb enhancer or promoter regions, inserted in attP2); 8,081 imaged with UAS-mCD8-GFP in adult male brains; embryo expression determined for 7,705 lines by in situ hybridization. · Results and Discussion

  2. ShownRoughly 3000 of the most useful lines were chosen for recloning into LexA and split-GAL4 vectors, giving 3,624 VT LexA lines in GAL80-suppressible and GAL80-insensitive variants, inserted at attP2, attP40, or both.

    3,624 VT LexA lines (GAL4 or human p65 activation domain fusions) in attP2, attP40, or both; 3,054 lines imaged with lexAop-myr-GFP in adult male brains. attP2 inserts better match parental GAL4 patterns but allow transvection. · Results and Discussion

  3. ShownSplit-GAL4 hemidriver libraries were produced for intersectional targeting, and many hemidriver lines were imaged in combination with a pan-neuronal partner hemidriver.

    2,736 VT ZpGAL4DBD lines (all attP2) and 2,826 VT p65ADZp lines (about one third attP2, rest attP40); images for 1,488 ZpGAL4DBD and 2,012 p65ADZp lines using elav hemidriver partners. · Results and Discussion

  4. ShownThe image dataset is public through Virtual Fly Brain, and stocks are distributed through public stock centers, supporting identification of useful intersections among millions of possible DBD and AD pairs.

    41,492 confocal images of male brains from 14,635 lines at Virtual Fly Brain; approximately 1000 VT GAL4 lines at VDRC; nearly all split-GAL4 hemidriver lines at Bloomington (Table 2). · Results and Discussion; Tables

  5. ClaimedThe authors assert that the large hemidriver libraries usually yield several independent split-GAL4 intersections for a desired cell type.

    Stated as the authors' experience; no quantitative success rate or per-cell-type analysis is given. · Results and Discussion

Methods, data and reproducibility

Non-coding genomic tiles of about 2kb were ranked for neuronal enhancer or promoter likelihood, cloned into GAL4, LexA and split-GAL4 vectors, and inserted at attP landing sites. Expression was imaged by confocal microscopy in registered adult male brains.

  • VT enhancer-GAL4 lines (generated); adult male brains imaged with UAS-mCD8-GFP · Drosophila · n = 8,166 generated; 8,081 imaged
  • VT LexA lines; adult male brains imaged with lexAop-myr-GFP · Drosophila · n = 3,624 generated; 3,054 imaged
  • VT ZpGAL4DBD hemidriver lines imaged with a pan-neuronal elav partner hemidriver · Drosophila · n = 2,736 generated; 1,488 imaged
  • VT p65ADZp hemidriver lines imaged with a pan-neuronal elav partner hemidriver · Drosophila · n = 2,826 generated; 2,012 imaged
  • Total confocal image dataset of male brains hosted at Virtual Fly Brain · Drosophila · n = 41,492 images from 14,635 lines
Methods & tools
GAL4/UAS system, LexA/lexAop system, split-GAL4 (ZpGAL4DBD and p65ADZp), pBPGUw and pBPGw vectors, UAS-mCD8-GFP reporter, lexAop-myr-GFP reporter, attP2 and attP40 landing sites, Zeiss LSM700 confocal microscopy, Nonrigid registration to nc82 reference, Virtual Fly Brain image database
Reagents & environment
Host lines attP2 (3L) and attP40 (2L); genomic DNA from w^1118; antibodies rabbit anti-GFP (TP401, Torrey Pines) and mouse anti-Bruchpilot (nc82, Developmental Studies Hybridoma Bank); Alexa Fluor 488 and 568 secondaries; Vectashield mounting.
Experimental conditions
Zeiss LSM700 confocal microscopes with 25x/0.8 plan multi-immersion objectives, single-track mode, 0.5x0.5x1 μm voxel size; antibody incubation 36 hours at 4°C.
Reproducibility gaps
Only approximately 1000 VT GAL4 lines are at VDRC. The Table 2 caption defines an unavailable stock category, but per-line availability is not shown in the text. No analysis code is described.
Limitations (4)
  • VT GAL4 and LexA lines rarely restrict expression to a single neuronal cell type, so intersectional split-GAL4 strategies are needed for cell-type-specific targeting. · stated by the authors
  • Pairing attP2 LexA insertions with attP2 GAL4 lines is subject to transvection, while attP40 inserts match the parental GAL4 pattern less reliably. · stated by the authors
  • Imaging covered adult male brains only in this dataset; female brains and ventral nerve cords were imaged separately at Janelia for many lines, and some lines were not imaged at all. · noted in this summary
  • No quantitative metrics of expression specificity, reproducibility across replicates, or annotation of cell types are reported, so claims of high specificity rest on qualitative description. · noted in this summary

Read this if you need Drosophila GAL4, LexA or split-GAL4 driver lines, or want to know which VT image resources and stock centers to use.

Citations
217

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