Comments (7)
It looks like the R1 fastq file is truncated, which causes an error when automatically detecting chemistry. Chemistry can be specified explicitly to skip automatic detection of chemistry:
multi_rna \
--chemistry scopeV3.0.1 \
..
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Would you please check the length read of R1 fastq reads? Are their lengths 61bp like the read in the error report?
scopeV3.0.1 requires a minimum R1 read length of 72bp
It seems that the main error is "IndexError: sequence length is not enough in R1 read: TGCCTGATCCGAACATGTAGGTCTCTGTCGGTGTGACTACGTATTAGCATGTGTCTGAACT"
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It seems that at least one R1 read is 61bp in length, which does not meet the minimum requirement of 72bp.
You can use grep
to find this read.
zcat {R1 fastq.gz} | grep -B 1 -A 2 TGCCTGATCCGAACATGTAGGTCTCTGTCGGTGTGACTACGTATTAGCATGTGTCTGAACT
In theory, the length of each read of the raw data should be the same. Why does this short read appear? Maybe
- The fastq file is truncated.
- The sequencing software has done some special processing.
While it may be important to find the reason for the short read length, here are some ways to bypass this error:
- Use the new nextflow-based pipeline: https://github.com/singleron-RD/scrna ; no R1 read minimum length check is performed.
- Use the
v2.0.7_no_R1_len_check
branch where R1 read minimum length check is disabled.
git clone -b v2.0.7_no_R1_len_check --single-branch https://github.com/singleron-RD/CeleScope.git
conda activate celescope
pip uninstall celescope
cd CeleScope
pip install .
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您好,请问当测序R1 pattern 是这样的 C9L16C9L16C9U12=71bp,该如何正确运行celescope呢?
回复: 参考#276 这里。设置 以下参数 :--chemistry customized --pattern --whitelist
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