A Balanced Reciprocal Translocation t(2;9)(p25;q13) Disrupting the LINC00299 Gene in a Patient with Intellectual Disability

Halinna Dornelles-Wawruk; Romina Soledad Heredia; Milton R de Paula-Junior; Maria Terezinha O Cardoso; Raphael S Bonadio; Bianca F Dos Reis; Aline Pic-Taylor; Silviene F de Oliveira; Juliana F Mazzeu

doi:10.1159/000500397

A Balanced Reciprocal Translocation t(2;9)(p25;q13) Disrupting the LINC00299 Gene in a Patient with Intellectual Disability

Mol Syndromol. 2019 Jul;10(4):234-238. doi: 10.1159/000500397. Epub 2019 Jun 12.

Authors

Affiliations

¹ Programa de Pós-graduação em Ciências da Saúde, Universidade de Brasília, Brasilia, Brazil.
² Hospital de Apoio de Brasília, Secretaria de Estado de Saúde do Distrito Federal, Brasilia, Brazil.
³ Programa de Pós-graduação em Ciências Médicas, Universidade de Brasília, Brasilia, Brazil.
⁴ Departamento de Genética e Morfologia, Instituto de Ciências Biológicas, Universidade de Brasília, Brasilia, Brazil.
⁵ Faculdade de Medicina, Universidade de Brasília, Brasilia, Brazil.

Abstract

Long intergenic noncoding RNAs (lincRNAs) are a class of noncoding RNAs implicated in several biological processes. LincRNA 299 (LINC00299) maps to 2p25.1 and its function is still unknown. However, this gene has been proposed as a candidate for intellectual disability (ID) in a patient with a balanced translocation where the breakpoint disrupted its ORF. Here, we describe a new case of LINC00299 disruption associated with ID. The individual, a 42-year-old woman, was referred to the clinical geneticist because of her son who had severe syndromic ID. G-banding and chromosomal microarray analysis were performed. Karyotyping of the boy revealed an extranumerary derivative chromosome identified as an unbalanced translocation between chromosomes 2 and 9 of maternal origin. The mother's karyotype showed a balanced translocation 46,XX,t(2;9)(p25;q13). Chromosomal microarray indicated a disruption of LINC00299. These data corroborate the role of LINC00299 as a causative gene for ID and broadens the spectrum of LINC00299-related phenotypes.

Keywords: Intellectual disability; LINC00299; LincRNA.