Retrotransposition disrupting EBP in a girl and her mother with X-linked dominant chondrodysplasia punctata

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 shorteni...

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Veröffentlicht in:Journal of human genetics 2022-05, Vol.67 (5), p.303-306
Hauptverfasser: Hiraide, Takuya, Masunaga, Yohei, Honda, Akira, Kato, Fumiko, Fukuda, Tokiko, Fukami, Maki, Nakashima, Mitsuko, Saitsu, Hirotomo, Ogata, Tsutomu
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container_end_page 306
container_issue 5
container_start_page 303
container_title Journal of human genetics
container_volume 67
creator Hiraide, Takuya
Masunaga, Yohei
Honda, Akira
Kato, Fumiko
Fukuda, Tokiko
Fukami, Maki
Nakashima, Mitsuko
Saitsu, Hirotomo
Ogata, Tsutomu
description 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.
doi_str_mv 10.1038/s10038-021-01000-1
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subjects Age
Alopecia
Baldness
Calcification
Cataracts
Childrens health
Chondrodystrophy
Congenital diseases
Conserved sequence
Disease
Endonuclease
Genetic disorders
Genetics
Genomes
Ichthyosis
Insertion
Medicine
Neonates
Pediatrics
Phenotypes
Polyadenine
Polyadenylation
Retrotransposition
Skin
Sterols
Vertebrae
Whole genome sequencing
title Retrotransposition disrupting EBP in a girl and her mother with X-linked dominant chondrodysplasia punctata
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