Avnir, YuvalWatson, Corey T.Glanville, JacobPeterson, Eric C.Tallarico, Aimee S.Bennett, Andrew S.Qin, KunFu, YingHuang, Chiung-YuBeigel, John H.Breden, FelixZhu, QuanMarasco, Wayne2016-03-012016Avnir, Y., C. T. Watson, J. Glanville, E. C. Peterson, A. S. Tallarico, A. S. Bennett, K. Qin, et al. 2016. “IGHV1-69 polymorphism modulates anti-influenza antibody repertoires, correlates with IGHV utilization shifts and varies by ethnicity.” Scientific Reports 6 (1): 20842. doi:10.1038/srep20842. http://dx.doi.org/10.1038/srep20842.2045-2322http://nrs.harvard.edu/urn-3:HUL.InstRepos:25658317IGHV polymorphism provides a rich source of humoral immune system diversity. One important example is the IGHV1-69 germline gene where the biased use of alleles that encode the critical CDR-H2 Phe54 (F-alleles) to make broadly neutralizing antibodies (HV1-69-sBnAb) to the influenza A hemagglutinin stem domain has been clearly established. However, whether IGHV1-69 polymorphism can also modulate B cell function and Ab repertoire expression through promoter and copy number (CN) variations has not been reported, nor has whether IGHV1-69 allelic distribution is impacted by ethnicity. Here we studied a cohort of NIH H5N1 vaccinees and demonstrate for the first time the influence of IGHV1-69 polymorphism on V-segment usage, somatic hypermutation and B cell expansion that elucidates the dominance of F-alleles in HV1-69-sBnAbs. We provide evidence that Phe54/Leu54 (F/L) polymorphism correlates with shifted repertoire usage of other IGHV germline genes. In addition, we analyzed ethnically diverse individuals within the 1000 genomes project and discovered marked variations in F- and L- genotypes and CN among the various ethnic groups that may impact HV1-69-sBnAb responses. These results have immediate implications for understanding HV1-69-sBnAb responses at the individual and population level and for the design and implementation of “universal” influenza vaccine.en-USJournal Article2016-03-0110.1038/srep20842