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A defensin-like gene expressed in the black-legged tick, Ixodes scapularis.
Med Vet Entomol 2005; 19(4):339-44MV

Abstract

The black-legged tick Ixodes scapularis Linnaeus (Acari: Ixodidae) is an important vector of microbial pathogens. Knowledge of the tick's innate immune response, particularly defensin and other antimicrobial peptides, is important for understanding how microbes survive in this tick. A defensin gene (slnA) from I. scapularis was obtained by reverse transcription-polymerase chain reaction (RT-PCR) using mRNA extracted from tissues of female ticks. RT-PCR indicated the gene was expressed in the midgut, haemocytes, and fat-body, although no evidence of a peptide was found. Sequencing a cloned cDNA fragment revealed a 225 bp open reading frame encoding a 74 amino acid pre-prodefensin, including the putative 38 amino acid mature peptide. Similarity between the defensin amino acid sequences of I. scapularis and Dermacentor variabilis (Say) (Acari: Ixodidae) was 62.2% for the pre-prodefensin region; for the mature defensins from these two species the similarity was 78.9%, with the six cysteine residues being located in the same relative position. PCR amplification and sequencing of chromosomal DNA suggests that slnA, along with vsnA, the defensin gene from D. variabilis, does not contain any introns. This is in contrast to the defensins described for the soft tick, Ornithodoros moubata (sensu Walton) (Acari: Argasidae). The role of defensin in the innate immune response of I. scapularis following microbial invasions is discussed.

Authors+Show Affiliations

Department of Biological Sciences, Old Dominion University, Norfolk, Virginia 23529, USA. whynes@odu.eduNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

16336297

Citation

Hynes, W L., et al. "A Defensin-like Gene Expressed in the Black-legged Tick, Ixodes Scapularis." Medical and Veterinary Entomology, vol. 19, no. 4, 2005, pp. 339-44.
Hynes WL, Ceraul SM, Todd SM, et al. A defensin-like gene expressed in the black-legged tick, Ixodes scapularis. Med Vet Entomol. 2005;19(4):339-44.
Hynes, W. L., Ceraul, S. M., Todd, S. M., Seguin, K. C., & Sonenshine, D. E. (2005). A defensin-like gene expressed in the black-legged tick, Ixodes scapularis. Medical and Veterinary Entomology, 19(4), pp. 339-44.
Hynes WL, et al. A Defensin-like Gene Expressed in the Black-legged Tick, Ixodes Scapularis. Med Vet Entomol. 2005;19(4):339-44. PubMed PMID: 16336297.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A defensin-like gene expressed in the black-legged tick, Ixodes scapularis. AU - Hynes,W L, AU - Ceraul,S M, AU - Todd,S M, AU - Seguin,K C, AU - Sonenshine,D E, PY - 2005/12/13/pubmed PY - 2006/6/23/medline PY - 2005/12/13/entrez SP - 339 EP - 44 JF - Medical and veterinary entomology JO - Med. Vet. Entomol. VL - 19 IS - 4 N2 - The black-legged tick Ixodes scapularis Linnaeus (Acari: Ixodidae) is an important vector of microbial pathogens. Knowledge of the tick's innate immune response, particularly defensin and other antimicrobial peptides, is important for understanding how microbes survive in this tick. A defensin gene (slnA) from I. scapularis was obtained by reverse transcription-polymerase chain reaction (RT-PCR) using mRNA extracted from tissues of female ticks. RT-PCR indicated the gene was expressed in the midgut, haemocytes, and fat-body, although no evidence of a peptide was found. Sequencing a cloned cDNA fragment revealed a 225 bp open reading frame encoding a 74 amino acid pre-prodefensin, including the putative 38 amino acid mature peptide. Similarity between the defensin amino acid sequences of I. scapularis and Dermacentor variabilis (Say) (Acari: Ixodidae) was 62.2% for the pre-prodefensin region; for the mature defensins from these two species the similarity was 78.9%, with the six cysteine residues being located in the same relative position. PCR amplification and sequencing of chromosomal DNA suggests that slnA, along with vsnA, the defensin gene from D. variabilis, does not contain any introns. This is in contrast to the defensins described for the soft tick, Ornithodoros moubata (sensu Walton) (Acari: Argasidae). The role of defensin in the innate immune response of I. scapularis following microbial invasions is discussed. SN - 0269-283X UR - https://www.unboundmedicine.com/medline/citation/16336297/A_defensin_like_gene_expressed_in_the_black_legged_tick_Ixodes_scapularis_ L2 - https://doi.org/10.1111/j.1365-2915.2005.00579.x DB - PRIME DP - Unbound Medicine ER -