Di Lazzaro Filho, Ricardo; Yamamoto, Guilherme Lopes; Silva, Tiago J; Rocha, Leticia A; Linnenkamp, Bianca D W; Castro, Matheus Augusto Araújo; Bartholdi, Deborah; Schaller, André; Leeb, Tosso; Kelmann, Samantha; Utagawa, Claudia Y; Steiner, Carlos E; Steinmetz, Leandra; Honjo, Rachel Sayuri; Kim, Chong Ae; Wang, Lisa; Abourjaili-Bilodeau, Raphaël; Campeau, Philippe; Warman, Matthew; Passos-Bueno, Maria Rita; ... (2023). Biallelic variants in DNA2 cause poikiloderma with congenital cataracts and severe growth failure reminiscent of Rothmund-Thomson syndrome. Journal of medical genetics, 60(11), pp. 1127-1132. BMJ Publishing Group 10.1136/jmg-2022-109119
Full text not available from this repository. (Request a copy)Rothmund-Thomson syndrome (RTS) is a rare, heterogeneous autosomal recessive genodermatosis, with poikiloderma as its hallmark. It is classified into two types: type I, with biallelic variants in ANAPC1 and juvenile cataracts, and type II, with biallelic variants in RECQL4, increased cancer risk and no cataracts. We report on six Brazilian probands and two siblings of Swiss/Portuguese ancestry presenting with severe short stature, widespread poikiloderma and congenital ocular anomalies. Genomic and functional analysis revealed compound heterozygosis for a deep intronic splicing variant in trans with loss of function variants in DNA2, with reduction of the protein levels and impaired DNA double-strand break repair. The intronic variant is shared by all patients, as well as the Portuguese father of the European siblings, indicating a probable founder effect. Biallelic variants in DNA2 were previously associated with microcephalic osteodysplastic primordial dwarfism. Although the individuals reported here present a similar growth pattern, the presence of poikiloderma and ocular anomalies is unique. Thus, we have broadened the phenotypical spectrum of DNA2 mutations, incorporating clinical characteristics of RTS. Although a clear genotype-phenotype correlation cannot be definitively established at this moment, we speculate that the residual activity of the splicing variant allele could be responsible for the distinct manifestations of DNA2-related syndromes.
Item Type: |
Journal Article (Original Article) |
|---|---|
Division/Institute: |
04 Faculty of Medicine > Department of Gynaecology, Paediatrics and Endocrinology (DFKE) > Clinic of Human Genetics 05 Veterinary Medicine > Department of Clinical Research and Veterinary Public Health (DCR-VPH) > Institute of Genetics 05 Veterinary Medicine > Department of Clinical Research and Veterinary Public Health (DCR-VPH) |
UniBE Contributor: |
Schaller, André, Leeb, Tosso |
Subjects: |
500 Science > 590 Animals (Zoology) 600 Technology > 630 Agriculture 600 Technology > 610 Medicine & health |
ISSN: |
0022-2593 |
Publisher: |
BMJ Publishing Group |
Language: |
English |
Submitter: |
Pubmed Import |
Date Deposited: |
14 Apr 2023 15:10 |
Last Modified: |
26 Oct 2023 00:12 |
Publisher DOI: |
10.1136/jmg-2022-109119 |
PubMed ID: |
37055165 |
Uncontrolled Keywords: |
Congenital, Hereditary, and Neonatal Diseases and Abnormalities DNA Repair Founder Effect Genetics Genetics, Medical |
URI: |
https://boris.unibe.ch/id/eprint/181723 |
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