Antibody repertoire development in fetal and neonatal piglets. XIII. Hybrid VH genes and the preimmune repertoire revisited.

Antibody repertoire development in fetal and neonatal piglets. I. Four VH genes account for 80 percent of VH usage during 84 days of fetal life.

VDJ rearrangement and VH gene usage during fetal development in 35 outbred piglets was examined by PCR amplification of VDJs; VDJs were subsequently characterized by hybridization with VH-specific gene probes and by sequencing. VDJ rearrangement was first seen in the fetal liver on day 30 of a 114-day gestation. Four VH genes (V(H)A, V(H)B, V(H)C, and V(H)E) accounted for approximately 80% of a...

Antibody repertoire development in fetal and neonatal piglets. XVII. IgG subclass transcription revisited with emphasis on new IgG3.

Fetal piglets offer an in vivo model for determining whether Ag-independent IgG subclass transcription proceeds in a manner that differs from subclass transcription in pigs exposed to environmental Ags and TLR ligands. Our data from approximately 12,000 Cgamma clones from > 60 piglets provide the first report on the relative usage of all known porcine Cgamma genes in fetal and young pigs. Studi...

Antibody repertoire development in fetal and neonatal piglets. XI. The relationship of variable heavy chain gene usage and the genomic organization of the variable heavy chain locus.

In this study, we have mapped the 3' H chain V region (V(H)) genes and those in the H chain diversity, H chain joining, and 5' portion of the H chain constant locus. We show that swine possess only two functional H chain diversity segments and only one functional H chain joining segment. These data help to explain more than a decade of observations on the preimmune repertoire of this species an...

Antibody repertoire development in fetal and neonatal piglets. XXIII: fetal piglets infected with a vaccine strain of PRRS Virus display the same immune dysregulation seen in isolator piglets.

The Ig levels and antibody repertoire diversification in fetal piglets infected with an attenuated Porcine Reproductive and Respiratory Syndrome Virus (PRRSV) were measured. Serum Ig levels were greatly elevated in PRRSV-infected fetuses; IgG was elevated >50-fold, IgM>5-15-fold and IgA>2-fold compared to control fetuses. Their IgM to IgG to IgA profile was the same as that in isolator piglets ...

Region 3 Diversity in the Developing Fetus Heavy Chain Complementarity-determining and Neonatal Piglets. Ii. Characterization of Antibody Repertoire Development in Fetal