py GR等价于R GRanges中的reduce() - 如何折叠远程数据?

问题描述 投票:2回答:2

在R(虽然longwinded):

这是一个测试data.frame

df <- data.frame(
  "CHR" = c(1,1,1,2,2),
  "START" = c(100, 200, 300, 100, 400),
  "STOP" = c(150,350,400,500,450)
  )

首先我制作GRanges对象:

gr <- GenomicRanges::GRanges(
  seqnames = df$CHR,
  ranges = IRanges(start = df$START, end = df$STOP)
  )

然后我减少间隔以折叠成新的格兰奇对象:

reduced <- reduce(gr)

现在在原始数据框中附加一个新列,确认哪些行属于同一个连续的“块”。

subjectHits(findOverlaps(gr, reduced))

输出:

> df
  CHR START STOP locus
1   1   100  150     1
2   1   200  350     2
3   1   300  400     2
4   2   100  500     3
5   2   400  450     3

我如何在Python中执行此操作?我知道pybedtools,但据我所知,这需要我将data.frame保存到磁盘。任何帮助赞赏。

python r bioinformatics
2个回答
1
投票

看来你正试图得到这些的交集。 Pybedtools将接受流作为输入。将您的数据读入床格式的字符串。

“CHR,启动,停止”

我从一个python字典开始并循环遍历它。

bed_string += "{0} {1} {2} {3} {0}|{1}|{2}|{3}\n".format(chrom, coord_start, coord_stop, aberration)
# Now create your bedtools.
breakpoint_bedtool = pybedtools.BedTool(bed_string, from_string=True)
target_bedtool = pybedtools.BedTool(self.args.Target_Bed_File, from_string=False)
# Find target intersects for printing.
breakpoint_target_intersect = breakpoint_bedtool.intersect(target_bedtool, wb=True, stream=True)

0
投票

https://github.com/biocore-ntnu/pyranges

import pyranges as pr
chromosomes = [1] * 3 + [2] * 2
starts = [100, 200, 300, 100, 400]
ends = [150, 350, 400, 500, 450]
gr = pr.PyRanges(chromosomes=chromosomes, starts=starts, ends=ends)
gr.cluster()
# +--------------+-----------+-----------+-----------+
# |   Chromosome |     Start |       End |   Cluster |
# |       (int8) |   (int32) |   (int32) |   (int64) |
# |--------------+-----------+-----------+-----------|
# |            1 |       100 |       150 |         1 |
# |            1 |       200 |       350 |         2 |
# |            1 |       300 |       400 |         2 |
# |            2 |       100 |       500 |         3 |
# |            2 |       400 |       450 |         3 |
# +--------------+-----------+-----------+-----------+

它将在0.0.21中出现。谢谢你的想法!

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