I am using the biopython Entrez.efetch command to retrieve all features (CDS, mRNA, ...) of some genomes.

In this case (NC_014649, Acanthamoeba polyphaga mimivirus), it works as expected:

from Bio import Entrez, SeqIO
handle = Entrez.efetch(id='NC_014649', db='nuccore', rettype='gb')
records = SeqIO.read(handle, 'gb')

[SeqFeature(FeatureLocation(ExactPosition(0), ExactPosition(1181549), strand=1), type='source'),
 SeqFeature(FeatureLocation(ExactPosition(191), ExactPosition(2609), strand=1), type='gene'),
 SeqFeature(FeatureLocation(ExactPosition(191), ExactPosition(2609), strand=1), type='mRNA'),
 SeqFeature(FeatureLocation(ExactPosition(191), ExactPosition(2579), strand=1), type='CDS'),

However in this case (NC_010830, Candidatus Amoebophilus asiaticus), it only returns one record for the whole genome.

handle = Entrez.efetch(id='NC_010830', db='nuccore', rettype='gb')
records = SeqIO.read(handle, 'gb')
[SeqFeature(FeatureLocation(ExactPosition(0), ExactPosition(1884364), strand=1), type='source')]

However, if I check the corresponding file in the browser, it does have features: https://www.ncbi.nlm.nih.gov/nuccore/NC_010830.1

What could be the reason for this inconsistency ? Did I miss something ?

  • $\begingroup$ This happens and when I've encountered this I resolved it by digging the features out by a different method, @arijeman 'solution' if correct needs an explanation about why because it's funndamental. $\endgroup$
    – M__
    Commented May 11, 2019 at 9:33

2 Answers 2


This has been answered before. See: https://stackoverflow.com/a/55402322/6262370

In short, you need to either use rettype='gbwithparts' or rettype='gb', style='withparts' to download the entire genbank flat file.

  • 1
    $\begingroup$ Thanks, I also had to set retmode='full', otherwise SeqIO.read would result in "ValueError: No records found in handle" $\endgroup$
    – cmdoret
    Commented May 15, 2019 at 13:37

I use the efetch bash command from edirect.

With efetch -db nuccore -id CP001102.1 -format gb, I get the Candidatus Amoebophilus asiaticus 5a2, complete genome in GenBank format.

You might try your command with CP001102.1 instead of NC_010830


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