Under Construction

Research


🛠 Current Projects

Epigenomic biomarkers of the incomplete maternal protection in type 1 diabetes
Epigenomic biomarkers of the incomplete maternal protection in type 1 diabetes
2024-2027
This study leverages cutting-edge statistical approaches to combine pregnancy and early life epigenetic measures from the ENDIA cohort with early life epigenetic measures and follow-up in the TEDDY and DAISY cohorts to deliver new insights into the impact of the T1D in utero environment on offspring T1D risk.
Epigenomic Mechanisms of the Maternal Protection in Type 1 Diabetes
Epigenomic Mechanisms of the Maternal Protection in Type 1 Diabetes
2023-2025
We will generate a robust catalogue of cell-type specific epigenetic measures on ENDIA subjects exposed and unexposed to maternal T1D and use it to deliver mechanistic insights into the cell compartments and biological pathways by which features of the maternal T1D in utero environment may affect offspring T1D risk.
Pharmacogenetic approaches to drug metabolism in American Indian Alaska Native People
Pharmacogenetic approaches to drug metabolism in American Indian/Alaska Native People
2023-2025
To understand perspectives on participant engagement, return of results, and data sharing from historically underrepresented participants (e.g., AIAN, African American, and Hispanic/Latino) in the Colorado Center for Personalized Medicine (CCPM) Biobank with focus groups and surveys. Develop a cross-site framework for assessing biobank participants’ perspectives and engagement related to bioethical issues in biomedical research.
Effects of Rare Variants and Ancestry on Beta Agonist Response in Asthma and COPD
Effects of Rare Variants and Ancestry on Beta Agonist Response in Asthma and COPD
2022-2025
We propose genetic studies based on β2AR pathway gene variants and whole-genome studies of rare variants and genetic ancestry to identify novel mechanisms for inter-ethnic differences in drug response and disease severity.
Exploring the Genomic Mechanism Behind the Maternal Protection from T1D
Exploring the Genomic Mechanism Behind the Maternal Protection from T1D
2021-2025
The overarching project goal is to gain better understanding of the genomic mechanism behind the maternal protection from T1D by scanning the epigenome for regions/genes where maternal protection may be operating and identifying maternal characteristics driving those epigenetic changes.

📁 Past Projects

Multi-omics integration to characterize genetic influences on metabotypes of type 1 diabetes progression
Multi-omics integration to characterize genetic influences on metabotypes of type 1 diabetes progression
2020-2023
In this study, we examine more closely the metabolomics traits associated with type 1 diabetes and characterize the genetic variation driving those changes.
BioData Catalyst Fellows Program: Prediction and Characterization of Genetically Regulated Expression of Target Tissues in Asthma
BioData Catalyst Fellows Program: Prediction and Characterization of Genetically Regulated Expression of Target Tissues in Asthma
2020-2021
This study combines TOPMed whole genome sequencing, genetic arrays, and gene expression signatures of CD4+ T cell and nasal airway epithelium from two populations of African ancestry to gain insight into the genetics driving dysfunction in asthma.

📚 Publications

2025

Demographic Factors, Attitudes, and Pre-Existing Conditions Impacting COVID-19 Vaccine Hesitancy
Elizabeth L Kudron, Gabriela R Reguero, Katie M Marker, Jessica Guerra Callaway, Lauren A Vanderlin, Christopher R Gignoux, Jan T Lowery, Randi K Johnson
Cold Spring Harbor Laboratory  ·  01 Jul 2025  ·  doi:10.1101/2025.06.30.25330574
Differences in immune cell profiles around the time of islet autoimmunity seroconversion in children with and without type 1 diabetes
Kirk R. Hohsfield, Patrick M. Carry, Sarah D. Slack, Charlie T. Repaci, Lauren A. Vanderlinden, Katerina Kechris, Marian Rewers, Jill M. Norris, Randi K. Johnson
Cold Spring Harbor Laboratory  ·  27 Jun 2025  ·  doi:10.1101/2025.06.23.661117

2024

Maternal Serum Metabolomics in Mid-Pregnancy Identifies Lipid Pathways as a Key Link to Offspring Obesity in Early Childhood
Ellen C. Francis, Katerina Kechris, Randi K. Johnson, Shristi Rawal, Wimal Pathmasiri, …, Xiuxia Du, Thomas Jansson, Dana Dabelea, Susan J. Sumner, Wei Perng
International Journal of Molecular Sciences  ·  11 Jul 2024  ·  doi:10.3390/ijms25147620
Longitudinal changes in DNA methylation during the onset of islet autoimmunity differentiate between reversion versus progression of islet autoimmunity.
Patrick M Carry, Lauren A Vanderlinden, Randi K Johnson, Teresa Buckner, Andrea K Steck, …, Ivana V Yang, Tasha E Fingerlin, Oliver Fiehn, Marian Rewers, Jill M Norris
Frontiers in immunology  ·  10 Jun 2024  ·  pmid:38915393
Multi-omics in nasal epithelium reveals three axes of dysregulation for asthma risk in the African Diaspora populations
Brooke Szczesny, Meher Preethi Boorgula, Sameer Chavan, Monica Campbell, Randi K. Johnson, …, Andrew H. Liu, Carole Ober, Margaret A. Taub, Kathleen C. Barnes, Rasika A. Mathias
Nature Communications  ·  28 May 2024  ·  doi:10.1038/s41467-024-48507-7

2023

DNA Methylation Near DLGAP2 May Mediate the Relationship between Family History of Type 1 Diabetes and Type 1 Diabetes Risk
Randi K. Johnson, Amanda J. Ireton, Patrick M. Carry, Lauren A. Vanderlinden, Fran Dong, …, Brigitte Frohnert, Ivana V. Yang, Katerina Kechris, Marian Rewers, Jill M. Norris
Pediatric Diabetes  ·  11 Sep 2023  ·  doi:10.1155/2023/5367637
An Oxylipin-Related Nutrient Pattern and Risk of Type 1 Diabetes in the Diabetes Autoimmunity Study in the Young (DAISY)
Teresa Buckner, Randi K. Johnson, Lauren A. Vanderlinden, Patrick M. Carry, Alex Romero, …, Tessa Crume, Wei Perng, Katerina Kechris, Marian Rewers, Jill M. Norris
Nutrients  ·  14 Feb 2023  ·  doi:10.3390/nu15040945
COVID-19 Mortality in the Colorado Center for Personalized Medicine Biobank
Amanda N. Brice, Lauren A. Vanderlinden, Katie M. Marker, David Mayer, Meng Lin, …, Jonathan A. Shortt, Alex Romero, Jan T. Lowery, Christopher R. Gignoux, Randi K. Johnson
International Journal of Environmental Research and Public Health  ·  29 Jan 2023  ·  doi:10.3390/ijerph20032368

2022

Changes in the Coexpression of Innate Immunity Genes During Persistent Islet Autoimmunity Are Associated With Progression of Islet Autoimmunity: Diabetes Autoimmunity Study in the Young (DAISY)
Patrick M. Carry, Kathleen Waugh, Lauren A. Vanderlinden, Randi K. Johnson, Teresa Buckner, …, Andrea K. Steck, Ivana Yang, Tasha E. Fingerlin, Katerina Kechris, Jill M. Norris
Diabetes  ·  20 Jun 2022  ·  doi:10.2337/db21-1111
COVID-19 Surveillance in the Biobank at the Colorado Center for Personalized Medicine: Observational Study
Randi K Johnson, Katie M Marker, David Mayer, Jonathan Shortt, David Kao, Kathleen C Barnes, Jan T Lowery, Christopher R Gignoux
JMIR Public Health and Surveillance  ·  13 Jun 2022  ·  doi:10.2196/37327
Discovering metabolite quantitative trait loci in asthma using an isolated population
Randi K. Johnson, Tonya Brunetti, Kevin Quinn, Katrina Doenges, Monica Campbell, …, Margaret A. Taub, Rasika A. Mathias, Nichole Reisdorph, Kathleen C. Barnes, Michelle Daya
Journal of Allergy and Clinical Immunology  ·  01 May 2022  ·  doi:10.1016/j.jaci.2021.11.002
Lipid mediators are detectable in the nasal epithelium and differ by asthma status in female subjects.
Randi K Johnson, Jonathan Manke, Monica Campbell, Michael Armstrong, Meher Preethi Boorgula, …, Rasika A Mathias, Kathleen C Barnes, Alvaro Cruz, Nichole Reisdorph, Camila A Figueiredo
The Journal of allergy and clinical immunology  ·  15 Mar 2022  ·  pmid:35304161
COVID-19 Surveillance in the Biobank at the Colorado Center for Personalized Medicine
Randi K. Johnson, Katie M. Marker, David Mayer, Jonathan Shortt, David Kao, Kathleen C. Barnes, Jan T. Lowery, Christopher R. Gignoux
Cold Spring Harbor Laboratory  ·  21 Feb 2022  ·  doi:10.1101/2022.02.15.22271018

2021

Epigenome-Wide Association Study of Infant Feeding and DNA Methylation in Infancy and Childhood in a Population at Increased Risk for Type 1 Diabetes
Elizabeth Walker-Short, Teresa Buckner, Timothy Vigers, Patrick Carry, Lauren A. Vanderlinden, …, Randi K. Johnson, Ivana V. Yang, Katerina Kechris, Marian Rewers, Jill M. Norris
Nutrients  ·  13 Nov 2021  ·  doi:10.3390/nu13114057
An effective processing pipeline for harmonizing DNA methylation data from Illumina's 450K and EPIC platforms for epidemiological studies.
Lauren A Vanderlinden, Randi K Johnson, Patrick M Carry, Fran Dong, Dawn L DeMeo, Ivana V Yang, Jill M Norris, Katerina Kechris
BMC research notes  ·  08 Sep 2021  ·  pmid:34496950
A Mediation Approach to Discovering Causal Relationships between the Metabolome and DNA Methylation in Type 1 Diabetes
Tim Vigers, Lauren A. Vanderlinden, Randi K. Johnson, Patrick M. Carry, Ivana Yang, …, Laura Pyle, Marian Rewers, Oliver Fiehn, Jill M. Norris, Katerina Kechris
Metabolites  ·  14 Aug 2021  ·  doi:10.3390/metabo11080542
Phospholipid Levels at Seroconversion Are Associated With Resolution of Persistent Islet Autoimmunity: The Diabetes Autoimmunity Study in the Young.
Patrick M Carry, Lauren A Vanderlinden, Randi K Johnson, Teresa Buckner, Oliver Fiehn, …, Katerina Kechris, Ivana Yang, Tasha E Fingerlin, Marian Rewers, Jill M Norris
Diabetes  ·  16 Apr 2021  ·  pmid:33863802
Maternal food consumption during late pregnancy and offspring risk of islet autoimmunity and type 1 diabetes
Randi K. Johnson, Roy Tamura, Nicole Frank, Ulla Uusitalo, Jimin Yang, …, Jorma Toppari, Beena Akolkar, Jeffrey Krischer, Suvi M. Virtanen, Jill M. Norris
Diabetologia  ·  30 Mar 2021  ·  doi:10.1007/s00125-021-05446-y

2020

Prediction of the development of islet autoantibodies through integration of environmental, genetic, and metabolic markers
Bobbie‐Jo M. Webb‐Robertson, Lisa M. Bramer, Bryan A. Stanfill, Sarah M. Reehl, Ernesto S. Nakayasu, …, Brigitte I. Frohnert, Jill M. Norris, Randi K. Johnson, Stephen S. Rich, Marian J. Rewers
Journal of Diabetes  ·  16 Aug 2020  ·  doi:10.1111/1753-0407.13093
Metabolomics‐related nutrient patterns at seroconversion and risk of progression to type 1 diabetes
Randi K. Johnson, Lauren A. Vanderlinden, Brian C. DeFelice, Ulla Uusitalo, Jennifer Seifert, …, Tessa Crume, Oliver Fiehn, Marian Rewers, Katerina Kechris, Jill M. Norris
Pediatric Diabetes  ·  09 Aug 2020  ·  doi:10.1111/pedi.13085
Predictors of oxylipins in a healthy pediatric population
Teresa Buckner, Lauren A. Vanderlinden, Randi K. Johnson, Brian C. DeFelice, Patrick M. Carry, …, Fran Dong, Oliver Fiehn, Michael Clare-Salzler, Marian Rewers, Jill M. Norris
Pediatric Research  ·  29 Jul 2020  ·  doi:10.1038/s41390-020-1084-2
Gluten intake and risk of thyroid peroxidase autoantibodies in the Diabetes Autoimmunity Study In the Young (DAISY).
Jacqueline A Gardner, Randi K Johnson, Fran Dong, Michelle Hoffman, Andrea K Steck, Brigitte I Frohnert, Marian Rewers, Jill M Norris
Endocrine  ·  10 Jul 2020  ·  pmid:32651851
Type 1 diabetes-origins and epidemiology - Authors' reply.
Jill M Norris, Randi K Johnson, Lars C Stene
The lancet. Diabetes & endocrinology  ·  01 May 2020  ·  pmid:32333871
Longitudinal DNA methylation differences precede type 1 diabetes
Randi K. Johnson, Lauren A. Vanderlinden, Fran Dong, Patrick M. Carry, Jennifer Seifert, …, Brigitte I. Frohnert, Ivana V. Yang, Katerina Kechris, Marian Rewers, Jill M. Norris
Scientific Reports  ·  28 Feb 2020  ·  doi:10.1038/s41598-020-60758-0
DNA methylation near the INS gene is associated with INS genetic variation (rs689) and type 1 diabetes in the Diabetes Autoimmunity Study in the Young
Patrick M. Carry, Lauren A. Vanderlinden, Randi K. Johnson, Fran Dong, Andrea K. Steck, Brigitte I. Frohnert, Marian Rewers, Ivana V. Yang, Katerina Kechris, Jill M. Norris
Pediatric Diabetes  ·  28 Feb 2020  ·  doi:10.1111/pedi.12995
Type 1 diabetes-early life origins and changing epidemiology.
Jill M Norris, Randi K Johnson, Lars C Stene
The lancet. Diabetes & endocrinology  ·  27 Jan 2020  ·  pmid:31999944
Association between change in self-reported sugar intake and a sugar biomarker (δ13C) in children at increased risk for type 1 diabetes
Martha M. Henze, Elizabeth A. Bemis, Jennifer A. Seifert, Randi K. Johnson, Fran Dong, Marian Rewers, Jill M. Norris
Journal of Nutritional Science  ·  01 Jan 2020  ·  doi:10.1017/jns.2020.9

2019

Utilizing cooled liquid chromatography and chemical derivatization to separate and quantify C3-epimers of 25-hydroxy vitamin D and low abundant 1α,25(OH)
Brian C DeFelice, Theresa L Pedersen, Hanan Shorrosh, Randi K Johnson, Jennifer A Seifert, Jill M Norris, Oliver Fiehn
The Journal of steroid biochemistry and molecular biology  ·  10 Nov 2019  ·  pmid:31715316
Metabolite-related dietary patterns and the development of islet autoimmunity.
Randi K Johnson, Lauren Vanderlinden, Brian C DeFelice, Katerina Kechris, Ulla Uusitalo, …, Marian Rewers, Beena Akolkar, Jeffrey Krischer, Suvi M Virtanen, Jill M Norris
Scientific reports  ·  15 Oct 2019  ·  pmid:31616039
Gluten Intake and Risk of Celiac Disease: Long-Term Follow-up of an At-Risk Birth Cohort.
Karl Mårild, Fran Dong, Nicolai A Lund-Blix, Jennifer Seifert, Anna E Barón, …, Lars C Stene, Randi K Johnson, Edwin Liu, Marian J Rewers, Jill M Norris
The American journal of gastroenterology  ·  01 Aug 2019  ·  pmid:31082869
The global school-based student health survey as a tool to guide adolescent health interventions in rural Guatemala.
Randi K Johnson, Molly Lamb, Hillary Anderson, Michelle Pieters-Arroyo, Bradley T Anderson, Guillermo A Bolaños, Edwin J Asturias
BMC public health  ·  22 Feb 2019  ·  pmid:30795754
Gluten Intake and Risk of Islet Autoimmunity and Progression to Type 1 Diabetes in Children at Increased Risk of the Disease: The Diabetes Autoimmunity Study in the Young (DAISY).
Nicolai A Lund-Blix, Fran Dong, Karl Mårild, Jennifer Seifert, Anna E Barón, …, German Tapia, Lars C Stene, Randi K Johnson, Marian J Rewers, Jill M Norris
Diabetes care  ·  22 Feb 2019  ·  pmid:30796108

2015

Adverse Birth Outcomes in Colorado: Assessing the Impact of a Statewide Initiative to Prevent Unintended Pregnancy
Lisa M. Goldthwaite, Lindsey Duca, Randi K. Johnson, Danielle Ostendorf, Jeanelle Sheeder
American Journal of Public Health  ·  01 Sep 2015  ·  doi:10.2105/AJPH.2015.302711