Researchers have developed a new goat-derived antibody against gamma-tubulin that restores a long-missing tool for imaging the base of primary cilia, filling a gap left when a widely used commercial reagent disappeared from the market nearly a decade ago. The antibody, described in BMC Molecular and Cell Biology, produced strong and specific staining of basal bodies in methanol-fixed cells and worked alongside rabbit- and mouse-derived antibodies in three-colour immunofluorescence, expanding the combinations of markers that cilia researchers can deploy in a single sample.
Primary cilia are essential sensory organelles that protrude from the surface of many vertebrate cell types and participate in numerous signalling pathways and developmental processes. Each cilium is built from distinct components: the ciliary membrane, the basal body, the transition zone and the axoneme. The basal body, which originates from the mother centriole, acts as the organising centre and anchoring site for cilium formation. The transition zone next to it functions as a diffusion barrier that regulates protein traffic into and out of the organelle, while the axoneme, typically composed of nine pairs of microtubules arranged in a circular array, provides structural support and tracks for molecular motors and proteins needed for cilium assembly, maintenance and functional integrity.
When primary cilia malfunction, the result is a broad spectrum of hereditary disorders known as ciliopathies. These conditions show striking clinical heterogeneity, ranging from kidney disease and retinal degeneration to skeletal anomalies, brain malformations and severe obesity. Mutations in approximately 200 genes have been identified as causes so far. Structural abnormalities are common diagnostic clues: cilia may be shortened or absent, as seen in reduced ciliary length in Joubert syndrome, ciliary proteins such as ARL13B or IFT88 may be mislocalised as in Bardet-Biedl syndrome, and basal body positioning or clustering defects can disrupt ciliogenesis as in Meckel-Gruber syndrome. Mislocalisation of Hedgehog signalling components such as Smoothened, Patched or Gli proteins can also cause ciliopathies. Emerging evidence additionally implicates ciliary dysfunction in cancer, metabolic disorders including obesity, diabetes, liver fibrosis and organismal ageing.
Immunofluorescence is a powerful diagnostic complement to genetic testing in this field. The presence, absence and length of cilia, along with the abundance of ciliary proteins, serve as common biomarkers, and specific ciliary proteins are labelled to visualise subcompartments, study colocalisation or measure protein amounts by densitometry. Gamma-tubulin itself is a critical component of centrioles and basal bodies and plays an essential role in ciliary assembly and disassembly as well as in microtubule organisation at the microtubule-organising centre. Antibodies against it are routinely used to label basal bodies, which makes the loss of a reliable goat-derived reagent particularly consequential for multiplex experiments.
The problem arose in 2016, when Santa Cruz Biotechnology discontinued production and sales of goat-derived polyclonal antibodies, including its gamma-tubulin antibody sc-7396, and adequate alternative products have been unavailable since. Because most primary antibodies originate from rabbit or mouse, visualising several proteins at once requires fluorophores without spectral overlap and, ideally, primary antibodies raised in different host species. The three main structural components of the primary cilium — basal body, transition zone and axoneme — are often displayed simultaneously, and the absence of a goat option sharply limited antibody combinations. Commercial anti-gamma-tubulin antibodies from species other than mouse or rabbit were simply not available, prompting the team to produce and evaluate a novel goat-derived antibody designed to enable multiplexing in both basic research and diagnostic applications.
To generate the reagent, the researchers conjugated a gamma-tubulin peptide to three carrier proteins: keyhole limpet hemocyanin, cationised bovine serum albumin and bovine thyroglobulin. Successful conjugation was verified by SDS-PAGE, which showed a distinct shift in protein size compared with the unconjugated carriers. One White German Noble Goat was then immunised alternately with the KLH- and cBSA-conjugated peptide over a 105-day schedule of six subcutaneous injections, each containing 300 micrograms of conjugate. Intermediate sera collected on Day 56, after three immunisations, and Day 98, after five, specifically recognised BTG-conjugated gamma-tubulin in ELISA while showing no significant reactivity to unconjugated BTG, and pre-immune serum showed no detectable binding to the conjugate.
The final serum, collected on Day 119 after six immunisations, was dialysed and subjected to antigen-specific affinity purification on a column carrying the immobilised gamma-tubulin peptide. SDS-PAGE of the purified polyclonal antibody revealed characteristic light chain bands and multiple heavy chain bands corresponding in size to the immunoglobulin isotypes IgG, IgA and IgM. ELISA confirmed that the affinity-purified antibody retained strong and specific binding to BTG-conjugated gamma-tubulin, comparable to the unpurified final serum. A parallel preparation made by saturated ammonium sulphate precipitation likewise showed strong and specific reactivity similar to the Day 119 serum, confirming effective enrichment of antigen-specific antibodies by both purification routes.
In cellular imaging, the SAS-precipitated antibody delivered distinct punctate signals at the base of the cilium in serum-starved, methanol-fixed NIH-3T3 cells, consistent with basal body localisation. Co-immunostaining with antibodies against acetylated alpha-tubulin, a marker of the axoneme, and TMEM67, a known transition zone protein, validated the basal body specificity, with the merged images showing clear spatial separation of the three markers at the expected sites. The antibody also labelled centrioles and spindle pole structures robustly in mitotic cells and proved suitable for super-resolution imaging of primary cilia by dSTORM, where the axoneme, ciliary membrane segments and basal body were resolved in three colours. The affinity-purified version showed the same pattern but with an overall weaker signal.
Fixation proved to be a decisive variable. NIH-3T3 cells fixed with 4 percent paraformaldehyde at 4 degrees Celsius for one hour showed no detectable basal body staining at all, indicating that PFA crosslinking masks the relevant epitopes. Intriguingly, cryosections of embryonic mouse limb buds initially fixed with PFA also lacked basal body staining at first, but after subsequent methanol treatment distinct basal body staining became visible, suggesting that methanol can partially restore antigen accessibility even after PFA fixation and opening possibilities for optimising fixation protocols for individual purposes. The team further validated specificity using strategies proposed by Uhlen and coworkers: the new goat antibody co-localised robustly with a well-tested mouse gamma-tubulin antibody, and preincubation with a gamma-tubulin blocking peptide reduced the signal compared with the control.
The authors conclude that the new antibody addresses a key limitation in multiplex immunofluorescence imaging of basal bodies and related structures, supporting both cilia research and diagnostics of ciliopathies. Because gamma-tubulin is an evolutionarily conserved component of the microtubule-organising centre with central roles in mitotic spindle assembly, centrosome duplication and microtubule nucleation, aberrations in centrosomal proteins including gamma-tubulin are implicated in various cancers and in neurodevelopmental disorders such as microcephaly, so the reagent may also serve oncology and neurodevelopmental research involving centrosomal dysfunction. The authors additionally suggest that the antibody’s compatibility with methanol fixation may allow integration into expansion microscopy protocols, which are typically optimised for PFA-fixed specimens, and they propose testing epitope retrieval strategies such as heat-induced or proteolytic-induced epitope retrieval in combination with PFA fixation. Both antibody preparations developed in the study can be purchased directly from preclinics certified products GmbH.
Subject of Research: Development and validation of a goat-derived gamma-tubulin antibody for multiplex immunofluorescence imaging of primary cilia
Article Title: A goat-derived gamma-tubulin antibody for triple-channel imaging of primary cilia
Article References: Karapetian, E., Gerhardt, C., Lemanska, N., Budnik, M., Stahl, E., Füner, J., Hirschberg, S., & Pfirrmann, T. (2026). A goat-derived gamma-tubulin antibody for triple-channel imaging of primary cilia. BMC Molecular and Cell Biology, 27(1), Article 31. https://doi.org/10.1186/s12860-026-00595-7
Image Credits: AI Generated
DOI: 10.1186/s12860-026-00595-7
Keywords: primary cilia, gamma-tubulin, basal body, immunofluorescence, multiplex staining, ciliopathies, methanol fixation, antibody validation, NIH-3T3 cells, dSTORM, centrioles, mouse limb bud
News Source: Drew Townsend. (October 29, 2026). New Goat Antibody Restores Triple-Colour Imaging of Cilia Basal Bodies. Scienmag.
