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J Virol, May 1998, p. 4503-4507, Vol. 72, No. 5
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Identification of a Full-Length cDNA for an
Endogenous Retrovirus of Miniature Swine
Donna E.
Akiyoshi,1
Maria
Denaro,1
Haihong
Zhu,1
Julia L.
Greenstein,1
Papia
Banerjee,1 and
Jay A.
Fishman2,*
BioTransplant, Incorporated,
Charlestown,1 and
Infectious Disease and
Transplant Units, Massachusetts General Hospital and Harvard Medical
School, Boston,2 Massachusetts
Received 20 August 1997/Accepted 15 January 1998
Endogenous retroviruses of swine are a concern in the use of
pig-derived tissues for xenotransplantation into humans. The nucleotide
sequence of porcine endogenous retrovirus taken from lymphocytes of
miniature swine (PERV-MSL) has been characterized. PERV-MSL is a type C
retrovirus of 8,132 bp with the greatest nucleic acid sequence identity
to gibbon ape leukemia virus and murine leukemia virus. Constitutive
production of PERV-MSL RNA has been detected in normal leukocytes and
in multiple organs of swine. The copy numbers of full-length PERV
sequences per genome (approximately 8 to 15) vary among swine strains.
The open reading frames for gag, pol, and
env in PERV-MSL have over 99% amino acid sequence identity
to those of Tsukuba-1 retrovirus and are highly homologous to those of
endogenous retrovirus of cell line PK15 (PK15-ERV). Most of the
differences in the predicted amino acid sequences of PK15-ERV and
PERV-MSL are in the SU (cell attach- ment) region of
env. The existence of these PERV clones will enable studies
of infection by endogenous retroviruses in xenotransplantation.
*
Corresponding author. Mailing address: Infectious
Disease Unit, Massachusetts General Hospital, 149 13th St.,
Charlestown, MA 02129. Phone: (617) 726-5777. Fax: (617)
726-5411. E-mail: jfishman{at}helix.mgh.harvard.edu.
J Virol, May 1998, p. 4503-4507, Vol. 72, No. 5
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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