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Sperm mediated gene transfer in pig: Selection of donor boars and optimization of DNA uptake
Author(s) -
Lavitrano Marialuisa,
Forni Monica,
Bacci Maria Laura,
Di Stefano Carla,
Varzi Vincenzo,
Wang Hongjun,
Seren Eraldo
Publication year - 2003
Publication title -
molecular reproduction and development
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.745
H-Index - 105
eISSN - 1098-2795
pISSN - 1040-452X
DOI - 10.1002/mrd.10230
Subject(s) - biology , zygote , pronucleus , sperm , microinjection , exogenous dna , transgene , andrology , semen , transgenesis , genetics , genetically modified organism , microbiology and biotechnology , dna , gene , cryopreservation , embryo , reproductive technology , embryogenesis , medicine
Transgenic animals are produced primarily by microinjecting exogenous DNA into the male pronuclei of a zygote. Microinjection is successful in mice but not efficient in farm animals, limiting its general utility. We have pursued an alternative technology for producing transgenic animals: Sperm Mediated Gene Transfer (SMGT). Based on our finding that sperm cells bind and internalize exogenous DNA, we used sperm as a vector for transmitting, not only their own DNA, but also, the exogenously‐introduced gene of interest to the zygote. SMGT is highly efficient (up to greater than 80%) and relatively inexpensive; it can be used in species refractory to microinjection, whenever reproduction is mediated by gametes. In this report, we describe the procedure for selection of sperm donors and optimization of DNA uptake that are the key steps for the successful outcome of SMGT. We found that the nominal parameters that boar sperm should possess to serve as a good vector for exogenous DNA are the quality of semen based on standard parameters used in conventional animal breeding programs (volume, concentration, presence of abnormal sperm cells, motility at time of collection, and high progressive motility after 2 hr) and the ability of the sperm cells to take up and internalize exogenous DNA. The results described provide significant advances in SMGT technology applied to pigs, so that transgenic pigs can be efficiently obtained. Mol. Reprod. Dev. 64: 284–291, 2003. © 2003 Wiley‐Liss, Inc.