Article (Scientific journals)
Replication Errors Made During Oogenesis Lead to Detectable De Novo mtDNA Mutations in Zebrafish Oocytes with a Low mtDNA Copy Number.
Otten, Auke B. C.; Stassen, Alphons P. M.; Adriaens, Michiel et al.
2016In Genetics, 204 (4), p. 1423-1431
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Keywords :
de novo mutations; mitochondrial DNA; next generation sequencing; oogenesis; zebrafish
Abstract :
[en] Of all pathogenic mitochondrial DNA (mtDNA) mutations in humans, ~25% is de novo, although the occurrence in oocytes has never been directly assessed. We used next generation sequencing to detect point mutations directly in the mtDNA of 3-15 individual mature oocytes and three somatic tissues from eight zebrafish females. Various statistical and biological filters allowed reliable detection of de novo variants with heteroplasmy >/=1.5%. In total, we detected 38 de novo base substitutions, but no insertions or deletions. These 38 de novo mutations were present in 19 of 103 mature oocytes, indicating that ~20% of the mature oocytes carry at least one de novo mutation with heteroplasmy >/=1.5%. This frequency of de novo mutations is close to that deducted from the reported error rate of polymerase gamma, the mitochondrial replication enzyme, implying that mtDNA replication errors made during oogenesis are a likely explanation. Substantial variation in the mutation prevalence among mature oocytes can be explained by the highly variable mtDNA copy number, since we previously reported that ~20% of the primordial germ cells have a mtDNA copy number of </=73 and would lead to detectable mutation loads. In conclusion, replication errors made during oogenesis are an important source of de novo mtDNA base substitutions and their location and heteroplasmy level determine their significance.
Research Center/Unit :
AFFISH-RC - Applied and Fundamental FISH Research Center - ULiège
GIGA-I3 - Giga-Infection, Immunity and Inflammation - ULiège
CART - Centre Interfacultaire d'Analyse des Résidus en Traces - ULiège
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Otten, Auke B. C.
Stassen, Alphons P. M.
Adriaens, Michiel
Gerards, Mike
Dohmen, Richard G. J.
Timmer, Adriana J.
Vanherle, Sabina J. V.
Kamps, Rick
Boesten, Iris B. W.
Vanoevelen, Jo M.
Muller, Marc  ;  Université de Liège > Département des sciences de la vie > GIGA-R : Biologie et génétique moléculaire
Smeets, Hubert J. M.
Language :
English
Title :
Replication Errors Made During Oogenesis Lead to Detectable De Novo mtDNA Mutations in Zebrafish Oocytes with a Low mtDNA Copy Number.
Publication date :
01 December 2016
Journal title :
Genetics
ISSN :
0016-6731
eISSN :
1943-2631
Publisher :
Genetics Society of America, United States - Maryland
Volume :
204
Issue :
4
Pages :
1423-1431
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
Copyright (c) 2016, The Genetics Society of America.
Available on ORBi :
since 17 December 2016

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