| Disease ID | Source | Name | Description |
| 615752 | OMIM | Polymicrogyria, bilateral perisylvian, autosomal recessive (BPPR) | A form of polymicrogyria, a malformation of the cortex in which the brain surface is irregular and characterized by an excessive number of small gyri with abnormal lamination. BPPR is characterized by strikingly restricted polymicrogyria limited to the cortex surrounding the Sylvian fissure. Affected individuals have intellectual and language difficulty and seizures, but no motor disability. Polymicrogyria is a heterogeneous disorder, considered to be the result of post-migratory abnormal cortical organization. The disease is caused by variants affecting the gene represented in this entry. Homozygous deletion of 1 of 2 tandem 15-bp repeats located 144 bp upstream of the ADGRG1 non-coding exon 1m transcription start site, results in impaired perisylvian ADGRG1 expression and disruption of perisylvian gyri (PubMed:24531968). |
| 606854 | OMIM | Polymicrogyria, bilateral frontoparietal (BFPP) | A malformation of the cortex in which the brain surface is irregular and characterized by an excessive number of small gyri with abnormal lamination, most severe in the frontoparietal regions. BFPP clinical manifestations include developmental and psychomotor delay, cerebellar and pyramidal signs, truncal ataxia, seizures, hyperreflexia. Polymicrogyria is a heterogeneous disorder, considered to be the result of postmigratory abnormal cortical organization. The disease is caused by variants affecting the gene represented in this entry. |