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

BMC Medical Genetics

Vitaly V. Kadyshev¹  Tatyana A. Vasilyeva¹  Natalya N. Vasserman¹  Olga A. Shchagina¹  Andrey V. Marakhonov¹  Irina A. Mishina¹  Svetlana A. Repina¹  Sergey I. Kutsev¹  Rena A. Zinchenko²  Maria F. Shurygina³ 

[1] Laboratory of Genetic Epidemiology, Research Centre for Medical Genetics, Moscow, Russian Federation;Laboratory of Genetic Epidemiology, Research Centre for Medical Genetics, Moscow, Russian Federation;N.A. Semashko National Research Institute of Public Health, Moscow, Russian Federation;S. Fyodorov Eye Microsurgery Federal State Institution, Moscow, Russian Federation;

关键词: Hereditary eye pathology;    Clinical heterogeneity;    NGS;    NDP;    Norrie disease;   

DOI  :  10.1186/s12881-020-01093-z

来源: Springer

【 摘 要 】

BackgroundHereditary 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 presentationA 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.ConclusionsClinical 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.

【 授权许可】

CC BY