A variant of uncertain significance of the HMGA2 gene in a child with Silver-Russell syndrome-like phenotype: a case report.

ABSTRACT

Silver-Russell syndrome 5 (SRS5) is characterized by asymmetric intrauterine growth restriction (IUGR), poor postnatal growth, macrocephaly at birth, and feeding difficulties. Other possible features include triangular shaped face, prominent forehead, hypertelorism, epicanthus, micrognathia, brachydactyly, clinodactyly of the 5th finger, and syndactyly of the 2nd and 3rd toes. Pathogenic variants of the HMGA2 (high mobility group AT-hook 2) gene, on chromosome 12q14, which regulates the transcription of growth factor IGF2, have recently been associated with this syndrome. Herein, we present a 2.5-year-old boy with growth delay, SRS-like phenotype, and a variant of uncertain significance in the HMGA2 gene, which has not, to the best of our knowledge, been described to date in the medical literature. So far, 28 pathogenic variants of the HMGA2 gene in patients with clinical SRS phenotype have recently been reported. Therefore, HMGA2 gene testing should always be done in SRS patients who are found to be negative for the typical 11p15 (epi)mutations and matUPD7, while the mutations should also be added to growth retardation disorder panels.