Open AccessA Pure 2-Mb 3q26.2 Duplication Proximal to the Critical Region of 3q Duplication Syndrome
Author(s) -
Miriam Coelho Molck,
Milena Simioni,
Társis Paiva Vieira,
Fabíola Paoli Monteiro,
Vera Lúcia Gil-da-Silva-Lopes
Publication year - 2018
Publication title -
molecular syndromology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.609
H-Index - 36
eISSN - 1661-8777
pISSN - 1661-8769
DOI - 10.1159/000489870
Subject(s) - dup , gene duplication , microcephaly , clinodactyly , intellectual disability , genetics , biology , gene
Partial duplication of chromosome 3q - dup(3q) - is a recognizable syndrome with dysmorphic facial features, microcephaly, digital anomalies, and genitourinary and cardiac defects, as well as growth retardation and developmental delay. Most cases of dup(3q) result from unbalanced translocations or inversions and are accompanied by additional chromosomal imbalances. Pure dup(3q) is rare, and only 31 cases have been reported so far. We report a new case of a girl with a pure 2-Mb duplication at 3q26.2 not encompassing the known critical region 3q26.3q27. After an extensive review, to the best of our knowledge, the case herein presented harbors the shortest 3q duplication of this region. The clinical phenotype of this patient resembles previously reported cases of pure dup(3q) syndrome, including intellectual disability, synophrys, a wide nasal bridge, dysmorphic ears, clinodactyly, and cardiac defects. We suggest that the 3q26.2 duplication is a candidate copy number alteration explaining our patient's clinical phenotype.