Abstract
X-linked dominant chondrodysplasia punctata (CDPX2) is a rare congenital disorder caused by pathogenic variants in EBP on Xp11.23. We encountered a girl and her mother with CDPX2-compatible phenotypes including punctiform calcification in the neonatal period of the girl, and asymmetric limb shortening and ichthyosis following the Blaschko lines in both subjects. Although Sanger direct sequencing failed to reveal a disease-causing variant in EBP, whole genome sequencing (WGS) followed by Manta analysis identified a ~ 4.5 kb insertion at EBP exon 2 of both subjects. The insertion was associated with the hallmarks of retrotransposition such as an antisense poly(A) tail, a target site duplication, and a consensus endonuclease cleavage site, and the inserted sequence harbored full-length SVA_F1 element with 5′- and 3′-transductions containing the Alu sequence. The results imply the relevance of retrotransposition to the human genetic diseases and the usefulness of WGS in the identification of retrotransposition.
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Acknowledgements
We would like to thank the patients for participating in this work. We also thank Ms. Aya Kitamoto, and Mr. Naoki Adachi for their technical support. This work was supported by the grants from Japan Agency for Medical Research and Development (AMED) (JP19ek0109297 to H.S. and JP21ek0109549 to T.O.).
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Hiraide, T., Masunaga, Y., Honda, A. et al. Retrotransposition disrupting EBP in a girl and her mother with X-linked dominant chondrodysplasia punctata. J Hum Genet 67, 303–306 (2022). https://doi.org/10.1038/s10038-021-01000-1
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DOI: https://doi.org/10.1038/s10038-021-01000-1
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