DEFA1

Also known as DEF1, DEFA2, HNP-1, HP-1, HP1, MRS, defensin alpha 1

Defensin, alpha 1 also known as human alpha defensin 1, human neutrophil peptide 1 (HNP-1) or neutrophil defensin 1 is a human protein that is encoded by the DEFA1 gene. Human alpha defensin 1 belongs to the alpha defensin family of antimicrobial peptides.

Gene data

DEFA1

Name: defensin alpha 1
Type: protein-coding
Position: 6,977,649–6,980,094 (−)
Aliases: DEF1, DEFA2, HNP-1, HP-1, HP1, MRS
Ensembl: ENSG00000284983
RefSeq RNA: NM_004084.4, XM_011534740.4, XM_054332233.1, XM_054359868.1
RefSeq protein: NP_004075.1, XP_011533042.1, XP_054188208.1, XP_054215843.1

Defensins are a family of antimicrobial and cytotoxic peptides thought to be involved in host defense. They are abundant in the granules of neutrophils and also found in the epithelia of mucosal surfaces such as those of the intestine, respiratory tract, urinary tract, and vagina. Members of the defensin family are highly similar in protein sequence and distinguished by a conserved cysteine motif. The protein encoded by this gene, defensin, alpha 1, is found in the microbicidal granules of neutrophils and likely plays a role in phagocyte-mediated host defense. Several alpha defensin genes are clustered on chromosome 8. This gene differs from defensin, alpha 3 by only one amino acid. This gene and the gene encoding defensin, alpha 3 are both subject to copy number variation. [provided by RefSeq, Oct 2014].