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2018 ; 10
(3
): 431-443
Nephropedia Template TP
gab.com Text
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English Wikipedia
A natively paired antibody library yields drug leads with higher sensitivity and
specificity than a randomly paired antibody library
#MMPMID29376776
Adler AS
; Bedinger D
; Adams MS
; Asensio MA
; Edgar RC
; Leong R
; Leong J
; Mizrahi RA
; Spindler MJ
; Bandi SR
; Huang H
; Tawde P
; Brams P
; Johnson DS
MAbs
2018[Apr]; 10
(3
): 431-443
PMID29376776
show ga
Deep sequencing and single-chain variable fragment (scFv) yeast display methods
are becoming more popular for discovery of therapeutic antibody candidates in
mouse B cell repertoires. In this study, we compare a deep sequencing and scFv
display method that retains native heavy and light chain pairing with a related
method that randomly pairs heavy and light chain. We performed the studies in a
humanized mouse, using interleukin 21 receptor (IL-21R) as a test immunogen. We
identified 44 high-affinity binder scFv with the native pairing method and 100
high-affinity binder scFv with the random pairing method. 30% of the natively
paired scFv binders were also discovered with the randomly paired method, and 13%
of the randomly paired binders were also discovered with the natively paired
method. Additionally, 33% of the scFv binders discovered only in the randomly
paired library were initially present in the natively paired pre-sort library.
Thus, a significant proportion of "randomly paired" scFv were actually natively
paired. We synthesized and produced 46 of the candidates as full-length
antibodies and subjected them to a panel of binding assays to characterize their
therapeutic potential. 87% of the antibodies were verified as binding IL-21R by
at least one assay. We found that antibodies with native light chains were more
likely to bind IL-21R than antibodies with non-native light chains, suggesting a
higher false positive rate for antibodies from the randomly paired library.
Additionally, the randomly paired method failed to identify nearly half of the
true natively paired binders, suggesting a higher false negative rate. We
conclude that natively paired libraries have critical advantages in sensitivity
and specificity for antibody discovery programs.