Basic Information

Symbol
S100A9
RNA class
mRNA
Alias
S100 Calcium Binding Protein A9 MRP-14 MRP14 P14 Migration Inhibitory Factor-Related Protein 14 Leukocyte L1 Complex Heavy Chain Calprotectin L1H Subunit S100-A9 MAC387 60B8AG LIAG CGLB CAGB CFAG MIF NIF Protein S100-A9 Calgranulin B S100 Calcium-Binding Protein A9 (Calgranulin B) S100 Calcium-Binding Protein A9 Calgranulin-B L1AG
Location (GRCh38)
Forensic tag(s)
Cause of death analysis

MANE select

Transcript ID
NM_002965.4
Sequence length
573.0 nt
GC content
0.5567

Transcripts

ID Sequence Length GC content
AAACACUCUGUGUGGCUCCUCGGCUUUGACAGAGUGCAAGACGAUGACU… 573 nt 0.5567
Summary

The protein encoded by this gene is a member of the S100 family of proteins containing 2 EF-hand calcium-binding motifs. S100 proteins are localized in the cytoplasm and/or nucleus of a wide range of cells, and involved in the regulation of a number of cellular processes such as cell cycle progression and differentiation. S100 genes include at least 13 members which are located as a cluster on chromosome 1q21. This protein may function in the inhibition of casein kinase and altered expression of this protein is associated with the disease cystic fibrosis. This antimicrobial protein exhibits antifungal and antibacterial activity. [provided by RefSeq, Nov 2014]

Forensic Context

A study in humans demonstrated that the S100A9 was significantly upregulated in peripheral blood mononuclear cells from sepsis patients compared to healthy controls, with a log2 fold change of 4.48 [Wu et al. DOI:10.7150/ijms.46910]. A study in mice demonstrated that the S100A9 is a pleiotropic cytokine mediating inflammatory responses through receptor complexes including CD74, CD44, CXCR2, and CXCR4 [Tao et al. DOI:10.1007/s10753-025-02346-w].