rs12821256
Variant in the KITLG gene (KIT Ligand (Stem Cell Factor))
rs12821256 is a single nucleotide polymorphism (SNP) in the KITLG gene, involved in mast cell and melanocyte survival. Variants at this position have been studied in relation to immune function, metabolism, and chronic illness.
This page is for educational and informational purposes only. Not a diagnostic tool. Always consult a qualified healthcare provider.
What is the rs12821256 variant?
rs12821256 is a SNP (single nucleotide polymorphism) in the KITLG (KIT Ligand (Stem Cell Factor)) gene. It belongs to the Immune Signaling category and is part of the Histamine & MCAS biological cluster. KITLG encodes stem cell factor (SCF), the ligand for KIT that promotes mast cell survival, proliferation, and tissue residence.
Biological role and pathway
This variant sits within the KITLG gene, which is involved in the mast cell and melanocyte survival pathway. Genes within the Histamine & MCAS cluster work together to maintain balanced function across interconnected biological systems.
Variants in genes within this pathway may influence an individual's predisposition to altered function — particularly under conditions of physiological stress such as viral infection or prolonged illness.
rs12821256 and Long COVID / ME-CFS research
SCF/KIT signaling drives mast cell homeostasis; elevated SCF in inflammatory states may maintain chronic mast cell activation relevant to MCAS in Long COVID.
This information is based on published research and does not constitute medical advice. See references below.
Parent gene: KITLG
rs12821256 is one of 2 known variants in the KITLG gene. To understand the full biological context of this variant, explore the parent gene page.
View KITLG gene page →Conditions studied in relation to rs12821256
Research into KITLG variants including rs12821256 has explored associations with the following conditions. These are areas of scientific investigation and do not imply causation.
Genetic insights from DNA data
Consumer DNA files from 23andMe, AncestryDNA, and MyHeritage contain raw SNP data. When you upload your file to ChronicDNA, the analysis engine checks your genotype against a curated panel of 80+ genes selected for their relevance to Long COVID, ME/CFS, and connected biological pathways - some of which may include KITLG and the rs12821256 variant.
The report is educational - it explains which variants you carry, what the research says about them, and how they fit into the biological pathways most relevant to chronic illness. Results are presented in plain English with appropriate scientific context, no medical jargon, no scare tactics. All results should be discussed with a qualified healthcare provider.
Other variants in the KITLG gene
The following variants in KITLG are also studied in relation to chronic illness and may be analysed together for a more complete picture.
Frequently asked questions
What is the rs12821256 variant in the KITLG gene?
rs12821256 is a single nucleotide polymorphism (SNP) located in the KITLG (KIT Ligand (Stem Cell Factor)) gene, which is involved in mast cell and melanocyte survival. KITLG encodes stem cell factor (SCF), the ligand for KIT that promotes mast cell survival, proliferation, and tissue residence.
How may the rs12821256 variant relate to Long COVID or ME/CFS?
SCF/KIT signaling drives mast cell homeostasis; elevated SCF in inflammatory states may maintain chronic mast cell activation relevant to MCAS in Long COVID.
Can a consumer DNA test detect the rs12821256 variant?
Many consumer DNA tests such as 23andMe, AncestryDNA, and MyHeritage genotype common SNPs. ChronicDNA analyses your raw DNA file and reports on variants studied in relation to chronic illness, immune function, and metabolism. This is not a diagnostic service — results are informational and educational only.
Related articles
- Long COVID MCAS: Mast Cells, Histamine and Your Genes
Learn how Long COVID MCAS may develop, how it overlaps with POTS and histamine intolerance, and which genes research links to mast cell activity.
Find out if you carry the rs12821256 variant
Upload your DNA data from 23andMe, AncestryDNA, or MyHeritage and receive a personalised report covering >80 genes relevant to Long COVID and ME/CFS.
Get Your Personalised DNA ReportInformational and educational only · Not a diagnostic tool · GDPR compliant
References
The following publications were used in compiling the research context for KITLG and its variants. This is not an exhaustive literature review.
- [1]PMID: 33398161
- [2]Nature Genetics
- [3]Blood