TY - JOUR
T1 - Genetic analysis of Down syndrome-associated heart defects in mice
AU - Liu, Chunhong
AU - Morishima, Masae
AU - Yu, Tao
AU - Matsui, Sei Ichi
AU - Zhang, Li
AU - Fu, Dawei
AU - Pao, Annie
AU - Costa, Alberto C.
AU - Gardiner, Katheleen J.
AU - Cowell, John Kenneth
AU - Nowak, Normal J.
AU - Parmacek, Michael S.
AU - Liang, Ping
AU - Baldini, Antonio
AU - Yu, Y. Eugene
N1 - Funding Information:
Acknowledgments We thank Zhongyou Li, JeVrey Conroy and JeVrey LaDuca for their assistance and Richard DiCioccio and Paula Jones for their helpful suggestions on the manuscript. This study is supported in part by grants to Y.E. Yu from the Children’s Guild Foundation and the NIH (R01HL091519).
PY - 2011/11
Y1 - 2011/11
N2 - Human trisomy 21, the chromosomal basis of Down syndrome (DS), is the most common genetic cause of heart defects. Regions on human chromosome 21 (Hsa21) are syntenically conserved with three regions located on mouse chromosome 10 (Mmu10), Mmu16 and Mmu17. In this study, we have analyzed the impact of duplications of each syntenic region on cardiovascular development in mice and have found that only the duplication on Mmu16, i.e., Dp(16)1Yey, is associated with heart defects. Furthermore, we generated two novel mouse models carrying a 5.43-Mb duplication and a reciprocal deletion between Tiam1 and Kcnj6 using chromosome engineering, Dp(16Tiam1-Kcnj6)Yey/+ and Df(16Tiam1-Kcnj6)Yey/+, respectively, within the 22.9-Mb syntenic region on Mmu16. We found that Dp(16Tiam1-Kcnj6)Yey/+, but not Dp(16)1Yey/Df(16Tiam1-Kcnj6)Yey, resulted in heart defects, indicating that triplication of the Tiam1-Knj6 region is necessary and sufficient to cause DS-associated heart defects. Our transcriptional analysis of Dp(16Tiam1-Kcnj6)Yey/+ embryos confirmed elevated expression levels for the genes located in the Tiam-Kcnj6 region. Therefore, we established the smallest critical genomic region for DS-associated heart defects to lay the foundation for identifying the causative gene(s) for this phenotype.
AB - Human trisomy 21, the chromosomal basis of Down syndrome (DS), is the most common genetic cause of heart defects. Regions on human chromosome 21 (Hsa21) are syntenically conserved with three regions located on mouse chromosome 10 (Mmu10), Mmu16 and Mmu17. In this study, we have analyzed the impact of duplications of each syntenic region on cardiovascular development in mice and have found that only the duplication on Mmu16, i.e., Dp(16)1Yey, is associated with heart defects. Furthermore, we generated two novel mouse models carrying a 5.43-Mb duplication and a reciprocal deletion between Tiam1 and Kcnj6 using chromosome engineering, Dp(16Tiam1-Kcnj6)Yey/+ and Df(16Tiam1-Kcnj6)Yey/+, respectively, within the 22.9-Mb syntenic region on Mmu16. We found that Dp(16Tiam1-Kcnj6)Yey/+, but not Dp(16)1Yey/Df(16Tiam1-Kcnj6)Yey, resulted in heart defects, indicating that triplication of the Tiam1-Knj6 region is necessary and sufficient to cause DS-associated heart defects. Our transcriptional analysis of Dp(16Tiam1-Kcnj6)Yey/+ embryos confirmed elevated expression levels for the genes located in the Tiam-Kcnj6 region. Therefore, we established the smallest critical genomic region for DS-associated heart defects to lay the foundation for identifying the causative gene(s) for this phenotype.
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U2 - 10.1007/s00439-011-0980-2
DO - 10.1007/s00439-011-0980-2
M3 - Article
C2 - 21442329
AN - SCOPUS:80054764764
SN - 0340-6717
VL - 130
SP - 623
EP - 632
JO - Human Genetics
JF - Human Genetics
IS - 5
ER -