Last updated: 2018-06-12

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    File Version Author Date Message
    Rmd 8e585ce Briana Mittleman 2018-06-12 cov. vs A factors
    html ee80ba6 Briana Mittleman 2018-06-11 Build site.
    Rmd 3f145ae Briana Mittleman 2018-06-11 signature of mult nucleotide analysus
    html 4ef7d85 Briana Mittleman 2018-06-11 Build site.
    Rmd 03c7b14 Briana Mittleman 2018-06-11 start A analysis


The goal of this analysis is to start to understand the sequence composition of the three prime seq reads. This may help me detect misspriming at AAAAA rich regions rather than true site usage. The genomic sequence does not carry the polyadenylation signal, this means reads mapping to a genomic AAAAAA region may be false positives. Gruber et al. removed reads that consisted of more than 80% AAAA.

Percent nucleotide in bins

One method is to measure the number of AAAAAs in my bins with bedtools nuc. I willl need a fasta file and a bed file with the bin.

library(workflowr)
Loading required package: rmarkdown
This is workflowr version 1.0.1
Run ?workflowr for help getting started
library(ggplot2)
library(dplyr)
Warning: package 'dplyr' was built under R version 3.4.4

Attaching package: 'dplyr'
The following objects are masked from 'package:stats':

    filter, lag
The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union
library(tidyr)
library(reshape2)
Warning: package 'reshape2' was built under R version 3.4.3

Attaching package: 'reshape2'
The following object is masked from 'package:tidyr':

    smiths
#!/bin/bash

#SBATCH --job-name=nuc.bin
#SBATCH --time=8:00:00
#SBATCH --output=nuc.bin.out
#SBATCH --error=nuc.bin.err
#SBATCH --partition=broadwl
#SBATCH --mem=20G
#SBATCH --mail-type=END

module load Anaconda3  

source activate three-prime-env


bedtools nuc -s -fi /project2/gilad/briana/genome_anotation_data/genome/Homo_sapiens.GRCh37.75.dna_sm.all.fa -bed /project2/gilad/briana/genome_anotation_data/an.int.genome_200_strandspec.bed > /project2/gilad/briana/threeprimeseq/data/bin200.nuccov.bed  

I can now pull this file into R.

bin_nuccov=read.table("../data/bin200.nuccov.bed")
names(bin_nuccov)=c("chr", "start", "end", "bin", "score", "strand", "gene", "pct_at", "pct_gc", "numA", "numC", "numG", "numT", "numN", "numOther", "seqlen")

perc_A_bin=bin_nuccov %>% select("chr", "start", "end","bin", "strand", "gene", "numA") %>% mutate(percA=numA/200)
Warning: package 'bindrcpp' was built under R version 3.4.4
ggplot(perc_A_bin, aes(percA)) + geom_histogram(bins=30) + labs(title="Percent of As in the bins")

Expand here to see past versions of unnamed-chunk-4-1.png:
Version Author Date
4ef7d85 Briana Mittleman 2018-06-11

I will apply the same filter as I did in the cov.200bp.wind file. I will keep bins with greater than 0 reads in half of the libraries.

cov_all=read.table("../data/ssFC200.cov.bed", header = T, stringsAsFactors = FALSE)
#remember name switch!
names=c("Geneid","Chr", "Start", "End", "Strand", "Length", "N_18486","T_18486","N_18497","T_18497","N_18500","T_18500","N_18505",'T_18505',"N_18508","T_18508","N_18853","T_18853","N_18870","T_18870","N_19128","T_19128","N_19141","T_19141","N_19193","T_19193","N_19209","T_19209","N_19223","N_19225","T_19225","T_19223","N_19238","T_19238","N_19239","T_19239","N_19257","T_19257")

colnames(cov_all)= names

cov_nums_only=cov_all[,7:38]

keep.exprs=rowSums(cov_nums_only>0) >= 16

cov_all_filt=cov_all[keep.exprs,] 

cov_all_filt_bins= cov_all_filt %>% separate(col=Geneid, into=c("bin","gene"), sep=".E") %>% select(bin)

cov_all_filt_bins$bin=as.integer(cov_all_filt_bins$bin)

I will intersect the percA file with the bins in the filtered file.

perc_A_bin_filt= perc_A_bin %>% semi_join(cov_all_filt_bins, by="bin")

I can no plot the distribution of percA in this.

ggplot(perc_A_bin_filt, aes(percA)) + geom_histogram(bins = 30) + labs(title="Percent of As in the bins after filtering")

Expand here to see past versions of unnamed-chunk-7-1.png:
Version Author Date
4ef7d85 Briana Mittleman 2018-06-11

I will compare this distribution to those for other nucleotides. (C)

perc_C_bin=bin_nuccov %>% select("chr", "start", "end","bin", "strand", "gene", "numC") %>% mutate(percC=numC/200)

ggplot(perc_C_bin, aes(percC)) + geom_histogram(bins=30) + labs(title="Percent of Cs in the bins")

Expand here to see past versions of unnamed-chunk-8-1.png:
Version Author Date
ee80ba6 Briana Mittleman 2018-06-11

perc_C_bin_filt= perc_C_bin %>% semi_join(cov_all_filt_bins, by="bin")
ggplot(perc_C_bin_filt, aes(percC)) + geom_histogram(bins = 30) + labs(title="Percent of Cs in the bins after filtering")

Expand here to see past versions of unnamed-chunk-8-2.png:
Version Author Date
ee80ba6 Briana Mittleman 2018-06-11

’ For G

perc_G_bin=bin_nuccov %>% select("chr", "start", "end","bin", "strand", "gene", "numG") %>% mutate(percG=numG/200)

ggplot(perc_G_bin, aes(percG)) + geom_histogram(bins=30) + labs(title="Percent of Gs in the bins")

Expand here to see past versions of unnamed-chunk-9-1.png:
Version Author Date
ee80ba6 Briana Mittleman 2018-06-11

perc_G_bin_filt= perc_G_bin %>% semi_join(cov_all_filt_bins, by="bin")
ggplot(perc_G_bin_filt, aes(percG)) + geom_histogram(bins = 30) + labs(title="Percent of Gs in the bins after filtering")

Expand here to see past versions of unnamed-chunk-9-2.png:
Version Author Date
ee80ba6 Briana Mittleman 2018-06-11

for T

perc_T_bin=bin_nuccov %>% select("chr", "start", "end","bin", "strand", "gene", "numT") %>% mutate(percT=numT/200)

ggplot(perc_T_bin, aes(percT)) + geom_histogram(bins=30) + labs(title="Percent of Ts in the bins")

Expand here to see past versions of unnamed-chunk-10-1.png:
Version Author Date
ee80ba6 Briana Mittleman 2018-06-11

perc_T_bin_filt= perc_T_bin %>% semi_join(cov_all_filt_bins, by="bin")
ggplot(perc_T_bin_filt, aes(percT)) + geom_histogram(bins = 30) + labs(title="Percent of Ts in the bins after filtering")

Expand here to see past versions of unnamed-chunk-10-2.png:
Version Author Date
ee80ba6 Briana Mittleman 2018-06-11

Now I will join all of the percent usage of each nucleotide in the filtered bins so I can plot them on one plot.

percNuc= perc_A_bin_filt %>% left_join(perc_T_bin_filt, by=c("chr", "start", "end", "bin", "strand", "gene")) %>% left_join(perc_G_bin_filt, by=c("chr", "start", "end", "bin", "strand", "gene")) %>% left_join(perc_C_bin_filt, by=c("chr", "start", "end", "bin", "strand", "gene")) %>% select("bin", "percA", "percT", "percG", "percC")

percNuc_melt=melt(percNuc, id.vars = "bin")

ggplot(percNuc_melt, aes(value)) + geom_histogram(bins = 30) + facet_wrap(~variable) + labs(title="Percent each nucleotide in filtered bins")

Expand here to see past versions of unnamed-chunk-11-1.png:
Version Author Date
ee80ba6 Briana Mittleman 2018-06-11

Strech of Nucleotides

Next check is if the bins have 5 As in a row. I can do this using bedtools nuc as well.
###Five A’s

#!/bin/bash

#SBATCH --job-name=nucA
#SBATCH --time=8:00:00
#SBATCH --output=nucA.out
#SBATCH --error=nucA.err
#SBATCH --partition=broadwl
#SBATCH --mem=20G
#SBATCH --mail-type=END

module load Anaconda3  

source activate three-prime-env


bedtools nuc -s -fi /project2/gilad/briana/genome_anotation_data/genome/Homo_sapiens.GRCh37.75.dna_sm.all.fa -bed /project2/gilad/briana/genome_anotation_data/an.int.genome_200_strandspec.bed -pattern "AAAAA" > /project2/gilad/briana/threeprimeseq/data/bin200.5.A.nuccov.bed  
bin_Anuccov=read.table("../data/bin200.Anuccov.bed")
names(bin_Anuccov)=c("chr", "start", "end", "bin", "score", "strand", "gene", "pct_at", "pct_gc", "numA", "numC", "numG", "numT", "numN", "numOther", "seqlen", "fiveA")

hist(bin_Anuccov$fiveA)

Expand here to see past versions of unnamed-chunk-13-1.png:
Version Author Date
ee80ba6 Briana Mittleman 2018-06-11

I will filter this the same way I filtered the other file.

 bin_Anuccov_filt = bin_Anuccov %>% semi_join(cov_all_filt_bins, by="bin") %>% select( bin,  gene,  fiveA)

hist(bin_Anuccov_filt$fiveA)

Expand here to see past versions of unnamed-chunk-14-1.png:
Version Author Date
ee80ba6 Briana Mittleman 2018-06-11

summary(bin_Anuccov_filt$fiveA)
   Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
 0.0000  0.0000  0.0000  0.4404  0.0000 13.0000 

Count the number of bins with each value for number of 5 AAAAA

countA_regions= bin_Anuccov_filt %>% group_by(fiveA) %>% count(fiveA)

Five T’s

I will compare this to regions with 5 T’s
(This isnt the best comparison because the probability of each of these stretches genome wide may be different)

#!/bin/bash

#SBATCH --job-name=nucT
#SBATCH --time=8:00:00
#SBATCH --output=nucT.out
#SBATCH --error=nucT.err
#SBATCH --partition=broadwl
#SBATCH --mem=20G
#SBATCH --mail-type=END

module load Anaconda3  

source activate three-prime-env


bedtools nuc -s -fi /project2/gilad/briana/genome_anotation_data/genome/Homo_sapiens.GRCh37.75.dna_sm.all.fa -bed /project2/gilad/briana/genome_anotation_data/an.int.genome_200_strandspec.bed -pattern "TTTTT" > /project2/gilad/briana/threeprimeseq/data/bin200.5.T.nuccov.bed  
bin_Tnuccov=read.table("../data/bin200.5.T.nuccov.bed")
names(bin_Tnuccov)=c("chr", "start", "end", "bin", "score", "strand", "gene", "pct_at", "pct_gc", "numA", "numC", "numG", "numT", "numN", "numOther", "seqlen", "fiveT")

summary(bin_Tnuccov$fiveT)
   Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
 0.0000  0.0000  0.0000  0.4191  0.0000 14.0000 
bin_Tnuccov_filt = bin_Tnuccov %>% semi_join(cov_all_filt_bins, by="bin") %>% select( bin,  gene,  fiveT)

hist(bin_Tnuccov_filt$fiveT)

Expand here to see past versions of unnamed-chunk-17-1.png:
Version Author Date
ee80ba6 Briana Mittleman 2018-06-11

summary(bin_Tnuccov_filt$fiveT)
   Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
 0.0000  0.0000  0.0000  0.5163  1.0000  9.0000 
countT_regions= bin_Tnuccov_filt %>% group_by(fiveT) %>% count(fiveT)

The numbers are not super different.

Correlation between count and A statistics

Percent nucleotide

cov_all_filt

#select bin coverage fore 18486
cov_all_filt_18486=cov_all_filt %>%separate(col=Geneid, into=c("bin","gene"), sep=".E") %>% select(bin, T_18486)
cov_all_filt_18486$bin=as.integer(cov_all_filt_18486$bin)
#join with percA
perc_A_bin_filt_cov= perc_A_bin_filt %>% select(bin, percA) %>% right_join(cov_all_filt_18486,by="bin") 
#melt it 
perc_A_bin_filt_cov_melt=melt(perc_A_bin_filt_cov, id.vars="bin") 

#plot it 

ggplot(perc_A_bin_filt_cov, aes(y=T_18486, x=percA)) + geom_point()

I will remove bins we did not have coverage in.

perc_A_bin_filt_cov_no0= perc_A_bin_filt %>% select(bin, percA) %>% right_join(cov_all_filt_18486,by="bin") %>% filter(T_18486 >0 )

ggplot(perc_A_bin_filt_cov_no0, aes(y=T_18486, x=percA)) + geom_point()

Check for T

#join with percA
perc_T_bin_filt_cov= perc_T_bin_filt %>% select(bin, percT) %>% right_join(cov_all_filt_18486,by="bin") 
#melt it 
perc_T_bin_filt_cov_melt=melt(perc_T_bin_filt_cov, id.vars="bin") 

#plot it 

ggplot(perc_T_bin_filt_cov, aes(y=T_18486, x=percT)) + geom_point()

Number of times we see 5 of a nucleotide

#join with fiveA
bin_Anuccov_filt_cov= bin_Anuccov_filt %>% select(bin, fiveA) %>% right_join(cov_all_filt_18486,by="bin") 


#plot it 

ggplot(bin_Anuccov_filt_cov, aes(y=T_18486, x=fiveA)) + geom_point()

It does not look like these are drivers of the variation we see in counts.

Session information

sessionInfo()
R version 3.4.2 (2017-09-28)
Platform: x86_64-apple-darwin15.6.0 (64-bit)
Running under: macOS Sierra 10.12.6

Matrix products: default
BLAS: /Library/Frameworks/R.framework/Versions/3.4/Resources/lib/libRblas.0.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/3.4/Resources/lib/libRlapack.dylib

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] bindrcpp_0.2.2  reshape2_1.4.3  tidyr_0.7.2     dplyr_0.7.5    
[5] ggplot2_2.2.1   workflowr_1.0.1 rmarkdown_1.8.5

loaded via a namespace (and not attached):
 [1] Rcpp_0.12.17      compiler_3.4.2    pillar_1.1.0     
 [4] git2r_0.21.0      plyr_1.8.4        bindr_0.1.1      
 [7] R.methodsS3_1.7.1 R.utils_2.6.0     tools_3.4.2      
[10] digest_0.6.15     evaluate_0.10.1   tibble_1.4.2     
[13] gtable_0.2.0      pkgconfig_2.0.1   rlang_0.2.1      
[16] yaml_2.1.19       stringr_1.3.1     knitr_1.18       
[19] rprojroot_1.3-2   grid_3.4.2        tidyselect_0.2.4 
[22] glue_1.2.0        R6_2.2.2          purrr_0.2.5      
[25] magrittr_1.5      whisker_0.3-2     backports_1.1.2  
[28] scales_0.5.0      htmltools_0.3.6   assertthat_0.2.0 
[31] colorspace_1.3-2  labeling_0.3      stringi_1.2.2    
[34] lazyeval_0.2.1    munsell_0.4.3     R.oo_1.22.0      



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