Functional Immunogenomics Section

Luis M. Franco, M.D.

Overview

The Functional Immunogenomics Section (FIS) studies how genes control the function of cells in the human immune system. We are especially interested in how treatments that change the expression of human genes affect the behavior of immune cells. Our long-term goal is to enable the development of better treatments for human diseases that are caused by an overactive immune system.

FIS scientists work at the intersection of clinical medicine, human immunology, genomics, and bioinformatics. A major area of focus for our team is the dissection of the mechanisms by which glucocorticoids regulate human immunity. Glucocorticoids are a class of drugs. They have been the cornerstone of anti-inflammatory and immunosuppressive therapies for over 70 years. They are highly effective at controlling an overactive immune system, but they also have a long list of serious side effects. Although they are one of the most widely prescribed classes of drugs worldwide, there are surprisingly large gaps in our understanding of how glucocorticoids regulate the behavior of human immune cells. Our team is working to help fill in those gaps, by applying advanced genomic and proteomic technologies to the study of the response to glucocorticoids in healthy humans and people with autoimmune diseases.

Our Research Platform

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Diagram: our research platform, aimed at understanding how glucocorticoids work
The FIS’s research platform combines in vivo and in vitro studies in human cells and tissues, and applies cutting-edge genomic and proteomic technologies to improve our understanding of how drugs affect the immune system and to develop safer therapies for patients with autoimmune and inflammatory conditions.

The FIS’s research platform combines clinical studies in patients with autoimmune diseases and healthy volunteers, with laboratory studies of human cells and tissues. Cutting-edge genomic and proteomic technologies are employed to identify the key genes and proteins that are responsible for the functional effects of glucocorticoids in human cells. In collaboration with the National Center for Advancing Translational Sciences (NCATS), we then work to translate the findings of our research into therapies that can mimic the clinically beneficial effects of glucocorticoids but have fewer side effects.

Bioinformatics Tools

Web applications developed by our lab:

GCgx - How do glucocorticoids work?

GCgx is a scientific web application that allows scientists to study the response of different cell types to glucocorticoids. It provides a simple, mobile-friendly tool that can offer quick answers to the following questions: Is my gene of interest responsive to glucocorticoids in specific cell types? If so, how does its level of expression vary over time and how statistically significant is the change?

NeutGX - Explore the neutrophil transcriptome

NeutGX is a web application that allows investigators to explore the transcriptome of human neutrophils. This tool is available as part of a suite of NIAID Bioinformatics Applications.

Staff

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Group photo of seven members of the Franco lab.
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Our lab is always seeking to recruit the best talent in the scientific community. If you are interested in joining our team, please contact us.

Former Lab Members

Postbaccalaureate Students

  • Rose Dever, B.S., 2023-2025
  • Javid Javadikhomami, B.S., 2023-2025
  • Robert Kwiat, B.S., 2021-2023
  • Qilin Cao, B.S., 2019-2022
  • Thai Tran, B.S., 2019-2021

Medical Research Scholars

  • Ariel Bohner, D.V.M., 2021-2024

Rotating Medical/Graduate Students

  • John Michael Sanchez, M.D. Ph.D. Student, 2021

Image & Media Gallery

Clinical Trials

Scientific Publications

Selected Recent Publications

A deep intronic splice-altering AIRE variant causes APECED syndrome through antisense oligonucleotide-targetable pseudoexon inclusion.

Ochoa S, Hsu AP, Oler AJ, Kumar D, Chauss D, van Hamburg JP, van Laar GG, Oikonomou V, Ganesan S, Ferré EMN, Schmitt MM, DiMaggio T, Barber P, Constantine GM, Rosen LB, Auwaerter PG, Gandhi B, Miller JL, Eisenberg R, Rubinstein A, Schussler E, Balliu E, Shashi V, Neth O, Olbrich P, Le KM, Mamia N, Laakso S, Nevalainen PI, Grönholm J, Seppänen MRJ, Boon L, Uzel G, Franco LM, Heller T, Winer KK, Ghosh R, Seifert BA, Walkiewicz M, Notarangelo LD, Zhou Q, Askentijevich I, Gahl W, Dalgard CL, Perera L, Afzali B, Tas SW, Holland SM, Lionakis MS
Sci Transl Med.
2024 Sep 18;
16(765).
doi: 10.1126/scitranslmed.adk0845
PMID: 39292801

Shedding light onto the immunometabolic effects of glucocorticoids.

Franco LM
Nat Rev Rheumatol.
2024 Sep;
20(9).
doi: 10.1038/s41584-024-01144-2
PMID: 39090216

BTK drives neutrophil activation for sterilizing antifungal immunity.

Desai JV, Zarakas MA, Wishart AL, Roschewski M, Aufiero MA, Donkò A, Wigerblad G, Shlezinger N, Plate M, James MR, Lim JK, Uzel G, Bergerson JR, Fuss I, Cramer RA, Franco LM, Clark ES, Khan WN, Yamanaka D, Chamilos G, El-Benna J, Kaplan MJ, Staudt LM, Leto TL, Holland SM, Wilson WH, Hohl TM, Lionakis MS
J Clin Invest.
2024 May 2;
134(12).
doi: 10.1172/JCI176142
PMID: 38696257

hcHCR: High-Throughput Single-Cell Imaging of RNA in Human Primary Immune Cells.

Gadkari M, Sun J, Carcamo A, Fraser I, Franco LM, Pegoraro G
Methods Mol Biol.
2024;
2784().
doi: 10.1007/978-1-0716-3766-1_8
PMID: 38502482

Single-Cell Analysis Reveals the Range of Transcriptional States of Circulating Human Neutrophils.

Wigerblad G, Cao Q, Brooks S, Naz F, Gadkari M, Jiang K, Gupta S, O'Neil L, Dell'Orso S, Kaplan MJ, Franco LM
J Immunol.
2022 Aug 15;
209(4).
doi: 10.4049/jimmunol.2200154
PMID: 35858733

Key Publications

Endogenous glucocorticoids and human immunity: Time to revisit old dogmas. 

Bhatt B, Franco LM
Semin Immunol.
2025 Jun;
78().
doi: 10.1016/j.smim.2025.101949
PMID: 40203674

High-throughput imaging of mRNA at the single-cell level in human primary immune cells. 

Gadkari M, Sun J, Carcamo A, Alessi H, Hu Z, Fraser IDC, Pegoraro G, Franco LM
RNA.
2022 Sep;
28(9).
doi: 10.1261/rna.079239.122
PMID: 35764396

GCgx: transcriptome-wide exploration of the response to glucocorticoids. 

Cao Q, Boo Irizarry Y, Yazhuk S, Tran T, Gadkari M, Franco LM
J Mol Endocrinol.
2021 Dec 10;
68(2).
doi: 10.1530/JME-21-0107
PMID: 34787097

Glucocorticoid-induced eosinopenia results from CXCR4-dependent bone marrow migration. 

Hong SG, Sato N, Legrand F, Gadkari M, Makiya M, Stokes K, Howe KN, Yu SJ, Linde NS, Clevenger RR, Hunt T, Hu Z, Choyke PL, Dunbar CE, Klion AD, Franco LM
Blood.
2020 Dec 3;
136(23).
doi: 10.1182/blood.2020005161
PMID: 32659786

Immune regulation by glucocorticoids can be linked to cell type-dependent transcriptional responses. 

Franco LM, Gadkari M, Howe KN, Sun J, Kardava L, Kumar P, Kumari S, Hu Z, Fraser IDC, Moir S, Tsang JS, Germain RN
J Exp Med.
2019 Feb 4;
216(2).
doi: 10.1084/jem.20180595
PMID: 30674564

Glucocorticoid-induced eosinopenia in humans can be linked to early transcriptional events. 

Khoury P, Stokes K, Gadkari M, Makiya MA, Legrand F, Hu Z, Klion A, Franco LM
Allergy.
2018 Oct;
73(10).
doi: 10.1111/all.13497
PMID: 29885264

News & Highlights

NIAMS-Related Article |

New Web Application to Study Cellular Responses to Glucocorticoids

Although the drugs have been around for more than 70 years, scientists have a poor understanding of how glucocorticoids regulate the immune system and the mechanisms by which they cause toxicity in different organs.
Announcement |

NIH Offers Web-Based Tool to Study Gene Expression in Human Neutrophils

NIH scientists developed and recently released a free, online data query tool called NeutGX. Researchers around the world can use NeutGX to explore the genetic basis of neutrophil-mediated inflammation in autoimmune diseases, cancer, infectious diseases and other conditions.
Last Updated: August 2025