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zhouyiqi91 avatar zhouyiqi91 commented on July 29, 2024

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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calcaidecabello avatar calcaidecabello commented on July 29, 2024

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calcaidecabello avatar calcaidecabello commented on July 29, 2024

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zhouyiqi91 avatar zhouyiqi91 commented on July 29, 2024

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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calcaidecabello avatar calcaidecabello commented on July 29, 2024

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zhouyiqi91 avatar zhouyiqi91 commented on July 29, 2024

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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tuqiang2014 avatar tuqiang2014 commented on July 29, 2024

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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