To test the possible source of the HBV infection outside the study family, we searched the Genbank
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1 Supplementary Discussion The source of hepatitis B virus infection To test the possible source of the HBV infection outside the study family, we searched the Genbank and HBV Database ( and the representative sequences with the highest identity score (99%) were included in phylogenetic analysis. The HBV sequences derived from the study family were phylogenetically similar with strong statistical support (> 99 bootstrap replications), indicating that the HBV was acquired from only one source. Although it is also possible that the there were additional sources of HBV not represented in the public available database, we think the possible is low. If they acquired HBV from different sources, the actual HBV divergence between different hosts would be much larger, and the estimated rate of evolution based on the current expectation under mother-to-infant transmission would thus be faster. Providing that the rates of HBV evolution estimated based on mother-to-infant transmission are in a good agreement with the range shown in the literature, the possibility of more than one HBV source is low. Routes of hepatitis B virus transmission According to the colonization - adaptation tradeoff model, every transmission requires the HBV quasispecies to switch from adaptor to colonizer. As shown in Fig. 1, the HBV samples acquired from various individuals had diverged from a common pool, indicating that all individuals were infected by a similar group of viral strains. Thus, compared with the requirements for adaptors, which must continue evolving in response to host immune interaction, the requirements for colonizers are more uniform. Because the HBV must constantly shift between stages of infection, increases in transmission in a given period of time may reduce the time for the HBV to evolve. Thus, in a given period of time, we expect that more HBV transmissions will result in less divergence, if the route of HBV transmission within the family is concordant with mother-to-infant transmission. Otherwise, no such relationship is expected. We subsequently evaluated the relationship between genetic distances and the number of transmissions between individuals. In this study, most of the divergence times between individuals ranged years. Because divergence times between D2 and GD2 and between D3 and GD3 were much shorter than the rest pairs, they were not included in this analysis. The Supplementary Fig. 3 clearly illustrates that the number of transmission is negatively correlated with sequence divergence (τ = -0.29, p < 10-2 ; Kendall s rank
2 correlation). To further evaluate whether chance alone is able to generate this negative correlation. We conducted a simulation by randomizing the pairing the number of transmissions and genetic distance between individuals. The number of transmissions was randomly redistributed to each pairwise comparison and genetic distance. The simulation was repeated 10,000 times and the correlation coefficients were calculated. The results were tallied for each replicate, and distributions were used to determine the p value for the observed. According to simulation, the probability to observe the τ value by random association was only Therefore, the most likely route of transmission in this family is mother-to-infant transmission. REFERENCES 1. Günther S, Li BC, Miska S, Kruger DH, Meisel H, Will H A novel method for efficient amplification of whole hepatitis B virus genomes permits rapid functional analysis and reveals deletion mutants in immunosuppressed patients. J Virol 69: Wang HY, Chien MH, Huang HP, Chang HC, Wu CC, Chen PJ, Chang MH, Chen DS Distinct hepatitis B virus dynamics in the immunotolerant and early immunoclearance phases. J Virol 84:
3 Supplementary Table 1 Primers used in this study Primers Sequence Nucleotide Direction position A PCR primers B P1 5 -TTTTTCACCTCTGCCTAATCA ~ 1841 Sense P2 5 -AAAAAGTTGCATGGTGCTGG ~ 1806 Antisense Sequencing primers C R2466 5'-GTAAAGTTTCCCACCTTATG-3' -2447~-2426 Antisense F2312 5'-CCTATCTTATCAACACTTC-3' 2330 ~ 2348 Sense F2847 5'-CATGGGAGGTTGGTCTTC-3' 2864 ~ 2881 Sense F226 5'-AATCCTCACAATACCACAGA-3' 245 ~ 264 Sense F761 5'-CCAAGTCTGTACAACATCT-3' 779 ~ 797 Sense F1264 5'-ATCCATACTGCGGAACTC-3' 1281 ~ 1298 Sense A The base positions were numbered according to the reference sequence, NC_ B These primers are from Günther et al. (1995)(1). C These primers are from Wang et al. (2010)(2).
4 Supplementary Table 2 Assembly summary of NGS datasets Sample ID A B C D E F G H J D1-N1 18,734,418 12,415, ,452 14,479 11,815,355 12,120 10,899, ,184 3,180 D1-N2 19,744,796 13,090, ,253 70,420 12,423,910 63,630 9,913, ,167 3,147 D2-N1 25,232,036 17,264, ,554 72,819 16,324,626 50,383 13,285, ,377 3,215 D2-N2 28,321,560 19,393,376 1,272,836 94,547 17,868,725 69,147 13,640, ,265 3,202 GD2-N2 22,590,770 15,400, ,261 75,402 14,226,568 51,932 9,768, ,116 3,121 GD2-N3 22,444,862 14,724, ,088 41,762 13,916,990 25,370 10,203, ,319 3,120 D3-N1 22,182,802 14,666, ,898 49,375 13,703,815 15,652 9,999, ,805 3,119 D3-N2 22,750,886 14,928, ,127 66,711 13,851,121 47,907 12,872, ,812 3,196 GD3-N1 22,496,488 14,895,509 1,539,342 72,693 13,123,922 28,736 11,525, ,073 3,215 GD3-N2 19,747,532 13,581, ,328 40,485 12,785,764 28,935 9,232, ,962 3,183 S1-N 14,970,060 9,799, ,867 42,912 9,230,382 26,703 5,864, ,977 3,118 S2-N 18,715,324 12,506, ,725 81,129 11,389,896 54,857 7,814, ,894 3,146 Average 21,494,295 14,388, ,144 60,228 13,388,423 39,614 10,418, ,079 3,164 A, Number of original sequences; B, Number of high quality sequences; C, Number of high quality unique sequences; D, Number of high quality unique sequences ( 5 count); E, Number of sequences included in high quality unique sequences ( 5 count); F, Number of mapped high quality unique sequences ( 5 count); G, Number of sequences included in mapped high quality unique sequences ( 5 count); H, Average coverage; J, Assembled length (bp)
5 Supplementary Table 3 Number of substitutions in different open reading frames (ORF) of HBV between serum samples according to (A) majority rule consensus and (B) strict consequence methods based on cloning sequences. (A) Majority rule consensus ORF Number of changes P S X C Total (180.2) A 32 (5.6) 7 (0.1) 3 (0) 1 (0) Number of sites with substitutions Number of inferred substitutions B Proportion of multiple substitution excess 43.5% 48.1% 56.3% 34.9% 42.4% (B) Strict consequence ORF Number of changes P S X C Total (122.89) A 16 (2.51) 3 (0.03) 2 (0) 0 (0) Number of sites with substitutions Number of inferred substitutions B Proportion of multiple substitution excess 25.4% 17.9% 61.5% 30.2% 28.0% The data were derived from cloning sequences. P: polymerase; S: surface; C: core. A. The expected numbers of substitutions under Poisson distribution are in parentheses, which are all significantly different from the observed number of substitution by Chi-square test (p < 10-3 ). B. The number of substitutions was inferred by parsimony methods according to the relatedness within the family.
6 Supplementary Table 4. Summary of nucleotide substitutions at the cutoff of 0.01 by NGS dataset and corresponding amino acid changes in different open reading frames within the study family Position A Host P Freq. B S Freq. X Freq. C Freq. 5 D2 H305P 0.94, 0.01 T125P 0.97, D3; GM F307L 0.80, D1; D3 L321P 0.85, 0.09 F141L 0.89, D3 E332k 0.88, GD2 C340S 0.78, GD2; D3 345 L165S 0.89, D3; GM E347D 0.95, 0.05 K167T 0.95, GM 358 I178T 0.96, GD3 370 Q190P 0.99, < GD3 374 F194S 0.99, < GD2; D3 375 L195S 0.85, D1 384 Q204R 0.99, < GD2 398 G218E 0.86, D3 L437I 0.93, S1 454 Y274W 0.97, 0.00 GM 454 Y274S 0.97, < GD3 N464T 0.94, 0.02 I284L 0.95, D1 R473G 0.92, GM T474N 0.98, 0.01 P294T 0.97, S1 N477D 0.89, D3; GD3 N480D 0.52, D1, S1 N480S 0.52, 0.04 T300A 0.95, GM 483 Q303R 0.97, GM 497 T317M 0.99, D3 513 A333V 0.99, GM I515L 0.98, D3 515 Y335F 0.90, GM 521 S341L 0.99, < D3 543 T363I 0.99, D3 562 I382T 0.97, GM 574 F394C 0.98, < GD GM I661V 0.99, < GD GM K679Q 0.88, D1; GD D3; GM K743N 0.92, D1; GM D1 804 V44I 0.46, 0.06 GD2 804 V44L 0.46, GM Y806F 0.94, GM 807 T47P 0.96, D1 T809S 0.98, 0.02 D48V 0.97, D1 H86L 0.93, < D D GD2;GD3 P34A 0.83, < GD2 P34T 0.83, 0.12
7 1937 D3 V42A 0.90, D GD2 L89V 0.86, D3 S103G 0.89, , 2151 D3 L113A 0.96, D2; GD2 G116S 0.13, GD2 L126I 0.11, D1 R141K 0.98, D1 P159S 0.91, GD2 P164Q 0.84, S1 E17D 0.91, 0.07 G182C 0.91, GD2 19 S184T 0.94, GD2 45 S210P 0.90, D3 L46P 0.87, D3 K73N 0.63, D GD2 Q85K 0.92, D D1 N139D 0.96, D GD2 P206S 0.84, GD3 R219S 0.98, <0.01 E39A 0.84, GD2 S287T 0.99, < GD2 I289N 0.79, 0.05 S109T 0.94, D2 A301E 0.94, 0.01 Q121K 0.96, 0.02 Nucleotide substitution was defined as major nucleotide frequency greater than 0.99 in NGS data. P: polymerase; S: surface protein; X: X protein; C: core protein. Bold-types are changes from rare to common amino acid residues. A. Nucleotide positions are based on reference sequence NC_ B. Amino acid frequencies at each position are calculated from The Hepatitis B Virus database (HBVdb, Only HBV genotype B sequences were included. In total, there were 927 polymerase, 955 large and 2690 small surface, 974 X, and 1105 core proteins sequences. < sign indicates that the amino acid frequency is smaller than 0.01.
8 Supplementary Table 5 List of sites under positive selection in Wang et al., (2010) (2) ORF Position A Patient Frequency B Polymerase Surface X Core K73N A 0.63, 0.12 L288R G 0.81, 0.01 N480D C 0.52, 0.41 N480D F 0.52, 0.41 N480S G 0.52, 0.04 C602G G 0.17, 0.06 M617L E 0.71, 0.12 K743N F 0.92, 0.07 R841K F 0.83, 0.15 I84T G 0.51, 0.01 L108V G 0.94, 0.01 L182H G 0.95, <0.01 L195S A 0.85, 0.13 L195S E 0.85, 0.13 G218E A 0.86, 0.12 L223R A 0.94, 0.03 Q275H C 0.98, 0.01 T300A G 0.95, 0.03 Q303R C 0.97, 0.01 Q303H F 0.97, 0.01 C395Y E 0.96, 0.01 Y399S E 0.99, <0.01 A85T A 0.97, 0.01 H86P A 0.93, 0.02 K95Q F 0.96, 0.03 N118T A 0.35, 0.61 T118N C 0.61, 0.35 N118T G 0.35, 0.61 M127I F 0.07, 0.46 K130M A 0.79, 0.20 V131I A 0.80, 0.19 I88V E 0.93, 0.06 G92V E 0.97, 0.03 P164Q A 0.84, 0.12 P159L G 0.91, 0.02 T176A A 0.95, 0.04 G182C A 0.91, 0.05 Bold-types are sites overlapped with that of listed in Supplementary Table 4. Underlines indicate changes from rare to common amino acid variants. The hashed cells are regions not included in current NGS data.
9 A. Nucleotide positions are based on reference sequence NC_ B. Amino acid frequencies at each position are calculated from The Hepatitis B Virus database (HBVdb, Only HBV genotype B sequences were included. In total, there were 927 polymerase, 955 large and 2690 small surface, 974 X, and 1105 core proteins sequences. < sign indicates that the amino acid frequency is smaller than 0.01.
10 (a) (b) (c)
11 Supplement Figure 1 Time of divergence (in years) versus genetic distance derived from next generation sequencing data The genetic distances were derived from the whole genome (A) and nonsynonymous (B) and synonymous (C) sites of the non-overlapping regions. Diamonds are HBV divergence within hosts. Solid lines represent linear regressions with all data and the correlation coefficients (R 2 ) were 0.19 (p < 10-4 ; Pearson correlation), 0.14 (p < 10-3 ), and 0.26 (p < 10-5 ), respectively, for (A), (B), and (C). Dotted lines represent linear regressions without the diamonds points (between hosts comparisons) and the R 2 were 0.00 (p = 0.76), 0.01 (p = 0.83), and 0.04 (p = 0.04), respectively, for (A), (B), and (C). The dashed line in (A) was based on power regression (R 2 = 0.59; p < ). The regression equations in (A) were D = x 4.42 x 10-5 x T for linear regression and D = T for power regression, where D is the genetic distance and T is the time of divergence in years.
12 (a) *** * (b) ** (c)
13 Supplementary Figure 2 Number of transmissions versus HBV substitution rates derived from next generation sequencing data HBV substitution rates were derived from the whole genome (A) and nonsynonymous (B) and synonymous (C) sites of the non-overlapping regions. For (A) and (B), the substitution rates within hosts (number of transmission = 0) were significantly higher (p < 10-3, Wilcoxon rank sum test) than that of between hosts (number of transmissions = 1, 2, 3, and 4). The substitution rate between hosts decreased as transmission number increased in both (A) (dashed line, τ = -0.47, p < 10-7, Kendall's rank correlation) and (B) (τ = -0.24, p < 10-2 ). *, p < 0.05; **, p < 10-2 ; ***, p <10-5 (Wilcoxon rank sum test).
14 Supplement Figure 3 Strong negative correlation between number of transmission and genetic distance between individuals The Kendall s rank correlation coefficient was τ = (p < 10-2 ). Transmissions between D2 and GD2 and between D3 and GD3 have shorter divergence time than the rest pairs, and were not included in this analysis (see Supplement Discussion for details).
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