Bilateral frontoparietal polymicrogyria

General Information (adopted from Orphanet):

Synonyms, Signs: CEREBELLAR ATAXIA WITH NEURONAL MIGRATION DEFECT
BFPP
Number of Symptoms 25
OrphanetNr: 101070
OMIM Id: 606854
ICD-10: Q04.3
UMLs:
MeSH:
MedDRA:
Snomed:

Prevalence, inheritance and age of onset:

Prevalence: No data available.
Inheritance: Autosomal recessive inheritance
[Omim]
Age of onset:

Disease classification (adopted from Orphanet):

Parent Diseases: Bilateral polymicrogyria
 -Rare developmental defect during embryogenesis
 -Rare genetic disease
 -Rare neurologic disease

Symptom Information: Sort by abundance 

1
(HPO:0000639) Nystagmus 555 / 7739
2
(HPO:0000577) Exotropia 43 / 7739
3
(HPO:0000486) Strabismus 576 / 7739
4
(HPO:0000565) Esotropia 58 / 7739
5
(HPO:0001347) Hyperreflexia 363 / 7739
6
(HPO:0001250) Seizures 1245 / 7739
7
(HPO:0001276) Hypertonia 317 / 7739
8
(HPO:0001249) Intellectual disability 1089 / 7739
9
(HPO:0002136) Broad-based gait 30 / 7739
10
(HPO:0011448) Ankle clonus 31 / 7739
11
(HPO:0003487) Babinski sign 179 / 7739
12
(HPO:0002078) Truncal ataxia 41 / 7739
13
(HPO:0007256) Abnormal pyramidal signs 116 / 7739
14
(HPO:0001263) Global developmental delay 853 / 7739
15
(HPO:0001321) Cerebellar hypoplasia 114 / 7739
16
(HPO:0002365) Hypoplasia of the brainstem 41 / 7739
17
(HPO:0006821) Polymicrogyria, anterior to posterior gradient 1 / 7739
18
(OMIM) Finger dysmetria 1 / 7739
19
(OMIM) Dysconjugate gaze 1 / 7739
20
(HPO:0001317) Abnormality of the cerebellum 36 / 7739
21
(OMIM) Mental retardation, moderate to severe 20 / 7739
22
(HPO:0000007) Autosomal recessive inheritance 2538 / 7739
23
(OMIM) Polymicrogyria, most severe in the frontoparietal regions 1 / 7739
24
(HPO:0007266) Cerebral dysmyelination 13 / 7739
25
(HPO:0007095) Frontoparietal polymicrogyria 4 / 7739

Associated genes:

ClinVar (via SNiPA)

Gene symbol Variation Clinical significance Reference

Additional Information:

Clinical Description OMIM In 2 sisters, aged 7 and 10 years, Harbord et al. (1990) described developmental delay and a nonprogressive cerebellar ataxia with similar neurophysiologic and neuroradiologic findings of an extensive neuronal migration defect. There were no dysmorphic features, metabolic ...
Molecular genetics OMIM Piao et al. (2004) identified splice site, frameshift, and missense mutations in the GPR56 gene (see, e.g., 604110.0001-604110.0008) in 12 families with bilateral frontoparietal polymicrogyria of various ethnic origins. All missense mutations affected regions of the protein predicted ...