Prenatal diagnosis of Norrie disease after whole exome sequencing of an affected proband during an ongoing pregnancy: a case report.

Autor: Marakhonov AV; Laboratory of Genetic Epidemiology, Research Centre for Medical Genetics, Moscow, Russian Federation. marakhonov@generesearch.ru., Mishina IA; Laboratory of Genetic Epidemiology, Research Centre for Medical Genetics, Moscow, Russian Federation., Kadyshev VV; Laboratory of Genetic Epidemiology, Research Centre for Medical Genetics, Moscow, Russian Federation., Repina SA; Laboratory of Genetic Epidemiology, Research Centre for Medical Genetics, Moscow, Russian Federation., Shurygina MF; S. Fyodorov Eye Microsurgery Federal State Institution, Moscow, Russian Federation., Shchagina OA; Laboratory of Genetic Epidemiology, Research Centre for Medical Genetics, Moscow, Russian Federation., Vasserman NN; Laboratory of Genetic Epidemiology, Research Centre for Medical Genetics, Moscow, Russian Federation., Vasilyeva TA; Laboratory of Genetic Epidemiology, Research Centre for Medical Genetics, Moscow, Russian Federation., Kutsev SI; Laboratory of Genetic Epidemiology, Research Centre for Medical Genetics, Moscow, Russian Federation., Zinchenko RA; Laboratory of Genetic Epidemiology, Research Centre for Medical Genetics, Moscow, Russian Federation.; N.A. Semashko National Research Institute of Public Health, Moscow, Russian Federation.
Jazyk: angličtina
Zdroj: BMC medical genetics [BMC Med Genet] 2020 Oct 22; Vol. 21 (Suppl 1), pp. 156. Date of Electronic Publication: 2020 Oct 22.
DOI: 10.1186/s12881-020-01093-z
Abstrakt: Background: Hereditary ophthalmic pathology is a genetically heterogeneous group of diseases that occur either as an isolated eye disorder or as a symptom of hereditary syndromes (chromosomal or monogenic). Thus, a diagnostic search in some cases of ophthalmic pathology can be time- and cost-consuming. The most challenging situation can arise when prenatal diagnosis is needed during an ongoing pregnancy.
Case Presentation: A family was referred to the Research Centre for Medical Genetics (RCMG) for childbirth risk prognosis at 7-8 week of gestation because a previous child, a six-year-old boy, has congenital aniridia, glaucoma, retinal detachment, severe psychomotor delay, and lack of speech and has had several ophthalmic surgeries. The affected child had been previously tested for PAX6 mutations and 11p13 copy number variations, which revealed no changes. Considering the lack of pathogenic changes and precise diagnosis for the affected boy, NGS sequencing of clinically relevant genes was performed for the ongoing pregnancy; it revealed a novel hemizygous substitution NM_000266.3(NDP):c.385G > T, p.(Glu129*), in the NDP gene, which is associated with Norrie disease (OMIM #310600). Subsequent Sanger validation of the affected boy and his mother confirmed the identified substitution inherited in X-linked recessive mode. Amniotic fluid testing revealed the fetus was hemizygous for the variant and lead to the decision of the family to interrupt the pregnancy. Complications which developed during the termination of pregnancy required hysterectomy due to medical necessity.
Conclusions: Clinical polymorphism of hereditary ophthalmic pathology can severely complicate establishment of an exact diagnosis and make it time- and cost-consuming. NGS appears to be the method-of-choice in complicated cases, and this could substantially hasten the establishment of a diagnosis and genetic risk estimation.
Databáze: MEDLINE
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