Utilidad diagnóstica de la secuenciación de segunda y tercera generación en pacientes con discapacidad intelectual: revisión rápida

Barriga, Hugo Hernán Abarca; Sotomayor, Flor Vásquez

doi:10.1016/j.psiq.2023.100392

Cited by 1 publication

(1 citation statement)

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“…Until the technology and analyses are improved, we consider that CMA (normal-and high-resolution) and nextgeneration sequencing (NGS) should be used complementarily to synergistically improve their power of variant detection. Going forward, third-generation sequencing could replace conventional methods because it can detect almost all types of variants including SNVs and CNVs, while NGS primarily detects SNVs and CNVs, failing to achieve the same level of sensitivity as CMA [30].…”

Section: :116845458_116854956mentioning

confidence: 99%

Cornelia de Lange Syndrome Caused by an Intragenic Heterozygous Deletion in RAD21 Detected through Very-High-Resolution Chromosomal Microarray Analysis

Abarca-Barriga,

Punil Luciano,

Vásquez Sotomayor

2023

Genes

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Cornelia de Lange syndrome is a genetic and clinically heterogeneous entity, caused by at least five genes. It is characterized by short stature, gestalt facies, microcephaly, neurodevelopmental disorders, and other anomalies. In this report, we present a 13-year-old female patient with microcephaly, cleft palate, polydactyly, short stature, triangular facies, frontal bossing, a bulbous nose, an overfolded helix, limited pronosupination, and an anomalous uterus. No neurodevelopmental disorders were reported. A chromosomal microarray analysis of 6.5 million markers was performed in the proband and her parents. The results showed a de novo heterozygous microdeletion of exons 9–14 within RAD21, which confirmed the diagnosis of Cornelia de Lange syndrome type 4. Our patient did not show any neurologic phenotype (until the time of diagnosis), although neurodevelopmental disorders are frequently present in patients with Cornelia de Lange syndrome type 4, and despite carrying a deletion that was larger than previously reported. Therefore, unknown genetic modifiers or intrinsic mechanisms of RAD21 variants may exist and should be studied.

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Section: :116845458_116854956mentioning

confidence: 99%