Increased mutation accumulation during fetal development in Down syndrome

Study ID Alternative Stable ID Type
EGAS00001003982 Other

Study Description

Children with Down syndrome (DS) show a high incidence of leukemia, which is preceded by transient myeloproliferative disorder (TMD) in neonates. TMD is characterized by mutations in GATA1 that accumulate during fetal development, indicating that additional mutagenesis is required for leukemogenesis. Abnormalities in chromosome numbers can result in a mutator phenotype. However, it is unknown whether a trisomy of chromosome 21 (T21) results in enhanced mutation accumulation during human development. Here, we determined the mutational consequences of a constitutive T21 in DS fetuses compared to disomy 21 cells (D21) of D21 fetuses. We found that D21 fetal HPSCs had a higher somatic mutation rate compared to healthy adults HSPCs. Moreover, we observed an increase in somatic mutation load in T21 cells of DS fetuses, which was already apparent during the first cell divisions of embryogenesis. The mutation load could be explained by processes that are active during normal fetal development and were similar to those observed in TMD blast cells. Our study shows that T21 causes an increase ... (Show More)

Study Datasets 2 datasets.

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Dataset ID Description Technology Samples
Whole genome sequencing of HSPC and SI clones of 2 disomy- and 1 trisomy 21 fetuses samples (HiSeq X Ten samples). 5 disomy clones and 5 trisomy clones were included in this experiment. Three bulk samples were also included.
HiSeq X Ten 13
Whole genome sequencing of HSPC and SI clones of 3 disomy- and 3 trisomy 21 fetuses samples and 2 TMD samples (Novaseq 6000 samples). 22 disomy clones, 20 trisomy clones were included in this experiment. 11 bulk samples were also included.
Illumina NovaSeq 6000 53

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