Deletion of Chromosome 13 due to Different Rearrangements and Impact on Phenotype

Author(s)

Bellucco, Fernanda T. ^[1] ; de Oliveira-Junior, Helio Rodrigues ^[1] ; Guilherme, Roberta Santos ^[1] ; Bragagnolo, Silvia ^[1] ; Alvarez Perez, Ana B. ^[1] ; Meloni, Vera Ayres ^[1] ; Melaragno, I, Maria

Affiliation

^[1] I, Univ Fed Sao Paulo, Dept Morphol & Genet, Genet Div, Rua Botucatu 740, BR-04023900 Sao Paulo, SP - Brazil

• Document type: Journal article
• Source: MOLECULAR SYNDROMOLOGY; v. 10, n. 3, p. 139-146, 2019.
• Web of Science Citations: 0

Abstract

Patients with deletion of chromosome 13 present with variable clinical features, and the correlation between phenotype and genomic aberration is not well established in the literature, mainly due to variable sizes of the deleted segments and inaccuracy of breakpoint mapping. In order to improve the genotype-phenotype correlation, we obtained clinical and cytogenomic data from 5 Brazilian patients with different chromosome 13 deletions characterized by G-banding and array techniques. Breakpoints were nonrecurrent, with deletion sizes ranging from 3.8 to 43.3 Mb. Our patients showed some classic features associated with 13q deletion, independent of the location and size of the deletion: hypotonia, growth delay, psychomotor developmental delay, microcephaly, central nervous system anomalies, and minor facial dysmorphism as well as urogenital and limb abnormalities. Comparisons between the literature and our patients' data allowed us to narrow the critical regions that were previously reported for microphthalmia and urogenital abnormalities, indicating that gene haploinsufficiency of ARHGEF7, PCDH9 and DIAPH3, of MIR17HG and GPC6, and of EFNB2 may contribute to microcephaly, cardiovascular disease, and urogenital abnormalities, respectively. The knowledge about genes involved in the phenotypic features found in 13q deletion patients may help us to understand how the genes interact and contribute to their clinical phenotype, improving the patient's clinical follow-up. (C) 2019 S. Karger AG, Basel (AU)

• FAPESP's process: 14/11572-8 - Chromosomal rearrangements and their relevance in the etiology of genetic disorders: cytogenomic and molecular investigation
• Grantee: Maria Isabel de Souza Aranha Melaragno
• Support Opportunities: Research Projects - Thematic Grants