Automating High-Throughput Cell Transfection for Drug Discovery

Automating a multi-day cell transfection and formulation screening workflow is no small undertaking. HighRes recently engineered a system capable of processing 100 plates a day across five distinct cell lines, all inside a room barely larger than a standard walk-in closet.

The result is one of the more creatively constrained system designs in HighRes' recent portfolio: a compact, fully automated lab capable of running a complex, deadlock-prone protocol without human intervention from cell seeding through to luminescence readout (Fig. 1).

Figure 1. Rendering of HighRes’ automated high-throughput cell transfection system, featuring HighRes ACell™ on a Rail, Tecan Fluent 780, Wyatt DynaPro III, Tecan Spark Cyto, and many more instruments.

Why Transfection?

Cell transfection, the process of introducing foreign nucleic acid into a cell, is a cornerstone of modern drug discovery. By inserting specific genes, researchers can instruct cells to produce target proteins, which are then collected and analyzed downstream. Transfection-based workflows are central to formulation screening programs, where researchers test how different RNA formulation conditions perform across multiple cell line types, in both water-based and serum-based media.

The sheer combinatorial scale is what makes such workflows challenging. With 10 formulation plates, five cell lines, and two transfection conditions each, a system must manage hundreds of interdependent plate movements without ever creating a scheduling deadlock. This is a non-trivial feat even for experienced automation engineers.

The Three-Day Workflow

The protocol was designed as a sequential three-day process, each day handled by a distinct Cellario® protocol with its own scheduling logic.

Day 1: Cell Seeding

Five cell lines are grown and sorted into 96-well destination plates. Each of the five cell lines generates 20 destination plates, for a total of 100 plates produced in approximately four hours and eight minutes. The Tecan Fluent 780 performs all liquid transfers, with tips washed between cell lines to prevent cross-contamination.

Day 2: Transfection

The most complex day: 10 formulation plates are processed across all five cell lines, with two transfection types (water-based and serum-based) applied simultaneously to each. The Cellario Scheduler™ interleaves plate movements so that the same formulation plate visits every cell line before the next formulation plate is loaded, maximizing throughput across a projected 10-hour run. An inline DynaPro III measurement step captures particle size data during formulation preparation.

Critically, Cellario's scheduling capability allows both transfection types for the same cell line to be processed in parallel, rather than sequentially, dramatically improving overall run efficiency.

Day 3: Cell Lysis & Readout

All 100 cell plates receive lysis buffer and are read for luminescence via the Tecan Spark Cyto. The protocol paces plate release to match the plate read duration, ensuring every plate incubates for an identical period after receiving lysis before being read, delivering consistent, comparable results across the entire run in approximately 8 hours and 11 minutes.

Designing for Small Spaces

This system demonstrates how HighRes approaches automation in space-constrained environments.

Every instrument is evaluated for weight, footprint, and whether it could physically be maneuvered through standard doorways before being included. The weight constraints drive the choice of plate storage: rather than heavier robotic carousel systems, we selected our HighRes PicoServe™ units (lightweight, modular ambient storage towers) alongside a single 8-position plate hotel for active buffer staging. The LiCONiC STX140 incubator and STX44 refrigerated unit were chosen for their compact stackers, which maximised vertical plate density within the available height.

A deliberate upgrade path was built into the design from the outset: ambient storage can be scaled from PicoServe to an AmbiStore™ as throughput demands grow, without restructuring the rest of the system.

The Instrument Stack

Despite its compact footprint, the system is genuinely well-equipped (Table 1). The liquid handling workhorse is a Tecan Fluent 780 configured with a Fixed Channel Arm, 96-MCA384 head, reagent dispensing arm, and HEPA filtration under negative pressure — critical for maintaining aseptic conditions during cell work. A Wyatt DynaPro III dynamic light scattering reader, equipped with HighRes rotunda fingers, performs inline particle size measurements during Day 2 formulation preparation.

Table 1. Instrument list for HighRes' high-throughput cell transfection system.

What Makes the Scheduler the Star

The Cellario Scheduler™ is what transforms a collection of instruments into a genuinely capable system. On Day 2, it simultaneously manages 10 formulation plates, five cell line incubators, two transfection plate types, multiple tip-wash cycles, a DynaPro measurement step, and lid handling operations, all without creating circular resource dependencies that would halt the run.

The key scheduling insight is to process one formulation plate through all five cell lines before moving to the next. This serializes the formulation dimension while parallelizing the cell line dimension, enabling simultaneous processing of water-based and serum-based transfections for the same cell line, a pattern that is broadly applicable to any multi-analyte, multi-cell-line HTS workflow.

Cellario simulations verified the full Day 2 run at just over 10 hours with no deadlocks, providing confidence in the protocol before any physical installation takes place.

A Template for HTS Transfection

The applications analysis for this system was completed in just two weeks, a demonstration of Cellario's ability to rapidly assess and design for complex, constrained workflows. The Cellario protocol designs, scheduling simulations, and system configuration documented here represent a reusable template for any organization facing a high-throughput transfection challenge in a space-limited environment.

For teams exploring similar workflows, the key takeaways are straightforward: Cellario can handle the scheduling complexity that makes multi-cell-line, multi-condition transfection tractable at scale, and HighRes can design the physical system to fit the space you actually have, not the space you wish you had.

To discuss your transfection or HTS automation requirements, get in touch with us!