Oh What a Blast!

1 Getting the query fasta file

curl https://gannet.fish.washington.edu/seashell/snaps/Gadus_macrocephalus.coding.gene.V1.cds \
-k \
> ../data/Gadus_macrocephalus.coding.gene.V1.cds

Exploring what fasta file

head -3 ../data/Gadus_macrocephalus.coding.gene.V1.cds

## >Gma_1G0000010.1 locus=chr1:81612:97483:+    len:2343
## ATGCCTGTGAACGCGCGGGACCGGACAGTGCTGGGGCGTTTCCCCGGGGTCACGCTGGAA
## CCGGTGGAGGAGGAGGTGGAGGAGGAGGAGGAGGTGGAAGAGGACCAGGTGGAGCGAGGC

echo "How many sequences are there?"
grep -c ">" ../data/Gadus_macrocephalus.coding.gene.V1.cds

## How many sequences are there?
## 23843

# Read FASTA file
fasta_file <- "../data/Gadus_macrocephalus.coding.gene.V1.cds"  # Replace with the name of your FASTA file
sequences <- readDNAStringSet(fasta_file)

# Calculate sequence lengths
sequence_lengths <- width(sequences)

# Create a data frame
sequence_lengths_df <- data.frame(Length = sequence_lengths)

# Plot histogram using ggplot2
ggplot(sequence_lengths_df, aes(x = Length)) +
  geom_histogram(binwidth = 1, color = "grey", fill = "blue", alpha = 0.75) +
  labs(title = "Histogram of Sequence Lengths",
       x = "Sequence Length",
       y = "Frequency") +
  theme_minimal()

# Read FASTA file
fasta_file <- "../data/Gadus_macrocephalus.coding.gene.V1.cds"
sequences <- readDNAStringSet(fasta_file)

# Calculate base composition
base_composition <- alphabetFrequency(sequences, baseOnly = TRUE)

# Convert to data frame and reshape for ggplot2
base_composition_df <- as.data.frame(base_composition)
base_composition_df$ID <- rownames(base_composition_df)
base_composition_melted <- reshape2::melt(base_composition_df, id.vars = "ID", variable.name = "Base", value.name = "Count")

# Plot base composition bar chart using ggplot2
ggplot(base_composition_melted, aes(x = Base, y = Count, fill = Base)) +
  geom_bar(stat = "identity", position = "dodge", color = "black") +
  labs(title = "Base Composition",
       x = "Base",
       y = "Count") +
  theme_minimal() +
  scale_fill_manual(values = c("A" = "green", "C" = "blue", "G" = "yellow", "T" = "red"))

# Read FASTA file
fasta_file <- "../data/Gadus_macrocephalus.coding.gene.V1.cds"
sequences <- readDNAStringSet(fasta_file)

# Count CG motifs in each sequence
count_cg_motifs <- function(sequence) {
  cg_motif <- "CG"
  return(length(gregexpr(cg_motif, sequence, fixed = TRUE)[[1]]))
}

cg_motifs_counts <- sapply(sequences, count_cg_motifs)

# Create a data frame
cg_motifs_counts_df <- data.frame(CG_Count = cg_motifs_counts)

# Plot CG motifs distribution using ggplot2
ggplot(cg_motifs_counts_df, aes(x = CG_Count)) +
  geom_histogram(binwidth = 1, color = "black", fill = "blue", alpha = 0.75) +
  labs(title = "Distribution of CG Motifs",
       x = "Number of CG Motifs",
       y = "Frequency") +
  theme_minimal()

2 Database Creation

2.1 Obtain Fasta (UniProt/Swiss-Prot)

This is from here picur reviewe sequences I named based on the identify of the database given

cd ../data
curl -O https://ftp.uniprot.org/pub/databases/uniprot/current_release/knowledgebase/complete/uniprot_sprot.fasta.gz
mv uniprot_sprot.fasta.gz uniprot_sprot_r2023_04.fasta.gz
gunzip -k uniprot_sprot_r2023_04.fasta.gz

2.2 Making the database

mkdir ../blastdb
/home/shared/ncbi-blast-2.11.0+/bin/makeblastdb \
-in ../data/uniprot_sprot_r2023_04.fasta \
-dbtype prot \
-out ../blastdb/uniprot_sprot_r2023_04

3 Running Blastx

/home/shared/ncbi-blast-2.11.0+/bin/blastx \
-query ../data/Gadus_macrocephalus.coding.gene.V1.cds \
-db ../blastdb/uniprot_sprot_r2023_04 \
-out ../output/03-transcriptome-annotation/Gm.cds-uniprot_blastx.tab \
-evalue 1E-20 \
-num_threads 20 \
-max_target_seqs 1 \
-outfmt 6

head -2 ../output/03-transcriptome-annotation/Gm.cds-uniprot_blastx.tab

## Gma_1G0000010.1  sp|P22735|TGM1_HUMAN    50.659  683 318 7   328 2334    109 786 0.0 688
## Gma_1G0000020.1  sp|Q9JI35|HRH3_CAVPO    54.684  395 160 4   136 1266    50  443 1.98e-140   411

echo "Number of lines in output"
wc -l ../output/03-transcriptome-annotation/Gm.cds-uniprot_blastx.tab

## Number of lines in output
## 22481 ../output/03-transcriptome-annotation/Gm.cds-uniprot_blastx.tab

4 Joining Blast table with annoations.

4.1 Prepping Blast table for easy join

tr '|' '\t' < ../output/03-transcriptome-annotation/Gm.cds-uniprot_blastx.tab \
> ../output/03-transcriptome-annotation/Gm.cds-uniprot_blastx_sep.tab

head -1 ../output/03-transcriptome-annotation/Gm.cds-uniprot_blastx_sep.tab

## Gma_1G0000010.1  sp  P22735  TGM1_HUMAN  50.659  683 318 7   328 2334    109 786 0.0 688

4.2 Could do some cool stuff in R here reading in table

bltabl <- read.csv("../output/03-transcriptome-annotation/Gm.cds-uniprot_blastx_sep.tab", sep = '\t', header = FALSE)

spgo <- read.csv("https://gannet.fish.washington.edu/seashell/snaps/uniprot_table_r2023_01.tab", sep = '\t', header = TRUE)

datatable(head(bltabl), options = list(scrollX = TRUE, scrollY = "400px", scrollCollapse = TRUE, paging = FALSE))

datatable(head(spgo), options = list(scrollX = TRUE, scrollY = "400px", scrollCollapse = TRUE, paging = FALSE))

datatable(
  left_join(bltabl, spgo,  by = c("V3" = "Entry")) %>%
  select(V1, V3, V13, Protein.names, Organism, Gene.Ontology..biological.process., Gene.Ontology.IDs) 
 # %>% mutate(V1 = str_replace_all(V1,pattern = "solid0078_20110412_FRAG_BC_WHITE_WHITE_F3_QV_SE_trimmed", replacement = "Ab"))
)

annot_tab <-
  left_join(bltabl, spgo,  by = c("V3" = "Entry")) %>%
  select(V1, V3, V13, Protein.names, Organism, Gene.Ontology..biological.process., Gene.Ontology.IDs)

# Read dataset
#dataset <- read.csv("../output/blast_annot_go.tab", sep = '\t')  # Replace with the path to your dataset

# Select the column of interest
column_name <- "Organism"  # Replace with the name of the column of interest
column_data <- annot_tab[[column_name]]

# Count the occurrences of the strings in the column
string_counts <- table(column_data)

# Convert to a data frame, sort by count, and select the top 10
string_counts_df <- as.data.frame(string_counts)
colnames(string_counts_df) <- c("String", "Count")
string_counts_df <- string_counts_df[order(string_counts_df$Count, decreasing = TRUE), ]
top_10_strings <- head(string_counts_df, n = 10)

# Plot the top 10 most common strings using ggplot2
ggplot(top_10_strings, aes(x = reorder(String, -Count), y = Count, fill = String)) +
  geom_bar(stat = "identity", position = "dodge", color = "black") +
  labs(title = "Top 10 Species hits",
       x = column_name,
       y = "Count") +
  theme_minimal() +
  theme(legend.position = "none") +
  coord_flip()

#data <- read.csv("../output/blast_annot_go.tab", sep = '\t')

# Rename the `Gene.Ontology..biological.process.` column to `Biological_Process`
colnames(annot_tab)[colnames(annot_tab) == "Gene.Ontology..biological.process."] <- "Biological_Process"

# Separate the `Biological_Process` column into individual biological processes
data_separated <- unlist(strsplit(annot_tab$Biological_Process, split = ";"))

# Trim whitespace from the biological processes
data_separated <- gsub("^\\s+|\\s+$", "", data_separated)

# Count the occurrences of each biological process
process_counts <- table(data_separated)
process_counts <- data.frame(Biological_Process = names(process_counts), Count = as.integer(process_counts))
process_counts <- process_counts[order(-process_counts$Count), ]

# Select the 20 most predominant biological processes
top_20_processes <- process_counts[1:20, ]

# Create a color palette for the bars
bar_colors <- rainbow(nrow(top_20_processes))

# Create a staggered vertical bar plot with different colors for each bar
barplot(top_20_processes$Count, names.arg = rep("", nrow(top_20_processes)), col = bar_colors,
        ylim = c(0, max(top_20_processes$Count) * 1.25),
        main = "Occurrences of the 20 Most Predominant Biological Processes", xlab = "Biological Process", ylab = "Count")

# Create a separate plot for the legend
png("../output/GOlegend.png", width = 800, height = 600)
par(mar = c(0, 0, 0, 0))
plot.new()
legend("center", legend = top_20_processes$Biological_Process, fill = bar_colors, cex = 1, title = "Biological Processes")
dev.off()

## png 
##   2

knitr::include_graphics("../output/GOlegend.png")