Journal
EUROPEAN JOURNAL OF HUMAN GENETICS
Volume 29, Issue 11, Pages 1654-1662Publisher
SPRINGERNATURE
DOI: 10.1038/s41431-021-00880-3
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Funding
- Brain Center at Tel Aviv Sourasky Medical Center
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Genetic alterations in COL4A2 are less common than those of COL4A1 and their fetal phenotype has not been described to date. In this study, a three-generation family with an intragenic deletion in COL4A2 associated with prenatal intracerebral hemorrhage (ICH) and various cerebrovascular manifestations is reported. The study provides genetic evidence of prenatal ICH and highlights the variable phenotype and partial penetrance of this disease.
Genetic alterations in COL4A2 are less common than those of COL4A1 and their fetal phenotype has not been described to date. We describe a three-generation family with an intragenic deletion in COL4A2 associated with a prenatal diagnosis of recurrent fetal intracerebral hemorrhage (ICH), and a myriad of cerebrovascular manifestations. Exome sequencing, co-segregation analysis, and imaging studies were conducted on eight family members including two fetuses with antenatal ICH. Histopathological evaluation was performed on the terminated fetuses. An intragenic heterozygous pathogenic in-frame deletion; COL4A2, c.4151_4168del, (p.Thr1384_Gly1389del) was identified in both fetuses, their father with hemiplegic cerebral palsy (CP), as well as other family members. Postmortem histopathological examination identified microscopic foci of heterotopias and polymicrogyria. The variant segregated in affected individuals demonstrating varying degrees of penetrance and a wide phenotypic spectrum including periventricular venous hemorrhagic infarction causing hemiplegic CP, polymicrogyria, leukoencephalopathy, and lacunar stroke. We present radiographic, pathological, and genetic evidence of prenatal ICH and show, for what we believe to be the first time, a human pathological proof of polymicrogyria and heterotopias in association with a COL4A2 disease-causing variant, while illustrating the variable phenotype and partial penetrance of this disease. We highlight the importance of genetic analysis in fetal ICH and hemiplegic CP.
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