Symptom Information: Sort according to HPO 

1
(HPO:0001387) Joint stiffness Occasional [Orphanet] 322 / 7739
2
(HPO:0002334) Abnormality of the cerebellar vermis Very frequent [Orphanet] 137 / 7739
3
(HPO:0000252) Microcephaly Very frequent [Orphanet] 832 / 7739
4
(HPO:0001252) Muscular hypotonia Frequent [Orphanet] 990 / 7739
5
(HPO:0000737) Irritability 93 / 7739
6
(HPO:0001276) Hypertonia Frequent [Orphanet] 317 / 7739
7
(HPO:0007370) Aplasia/Hypoplasia of the corpus callosum Frequent [Orphanet] 180 / 7739
8
(HPO:0000347) Micrognathia 426 / 7739
9
(HPO:0000340) Sloping forehead Very frequent [Orphanet] 86 / 7739
10
(HPO:0001557) Prenatal movement abnormality Occasional [Orphanet] 16 / 7739
11
(HPO:0004331) Decreased skull ossification Occasional [Orphanet] 31 / 7739
12
(HPO:0002536) Abnormal cortical gyration Frequent [Orphanet] 72 / 7739
13
(HPO:0001992) Organic aciduria Very frequent [Orphanet] 28 / 7739
14
(HPO:0002240) Hepatomegaly Occasional [Orphanet] 467 / 7739
15
(HPO:0001250) Seizures Occasional [Orphanet] 1245 / 7739
16
(HPO:0002414) Spina bifida Frequent [Orphanet] 47 / 7739
17
(HPO:0004360) Abnormality of acid-base homeostasis Very frequent [Orphanet] 5 / 7739
18
(HPO:0002119) Ventriculomegaly Frequent [Orphanet] 253 / 7739
19
(HPO:0000253) Progressive microcephaly 37 / 7739
20
(HPO:0001321) Cerebellar hypoplasia 114 / 7739
21
(HPO:0001338) Partial agenesis of the corpus callosum 22 / 7739
22
(HPO:0001371) Flexion contracture 220 / 7739
23
(HPO:0002509) Limb hypertonia 13 / 7739
24
(HPO:0003128) Lactic acidosis 116 / 7739
25
(HPO:0004349) Reduced bone mineral density Frequent [Orphanet] 165 / 7739
26
(HPO:0008936) Muscular hypotonia of the trunk 77 / 7739
27
(HPO:0100736) Abnormality of the soft palate Occasional [Orphanet] 6 / 7739
28
(OMIM) Microcephaly, extreme 1 / 7739
29
(OMIM) Hepatomegaly associated with infection 1 / 7739
30
(OMIM) Nearly absent cranial vault 1 / 7739
31
(OMIM) Absence of anterior and posterior fontanelles 1 / 7739
32
(OMIM) No psychomotor development 1 / 7739
33
(OMIM) Immature brain with no gyral development 1 / 7739
34
(OMIM) Hypoplastic pons 1 / 7739
35
(OMIM) Lactic acidosis during infection 1 / 7739
36
(OMIM) Increased urinary 2-ketoglutarate (variable) 1 / 7739
37
(OMIM) Increased urinary lactate 4 / 7739
38
(HPO:0012795) Abnormality of the optic disc Very frequent [Orphanet] 187 / 7739
39
(HPO:0000277) Abnormality of the mandible Very frequent [Orphanet] 394 / 7739
40
(HPO:0004325) Decreased body weight Very frequent [Orphanet] 492 / 7739
41
(HPO:0001522) Death in infancy Very frequent [Orphanet] 275 / 7739
42
(HPO:0012758) Neurodevelopmental delay Very frequent [Orphanet] 949 / 7739
43
(HPO:0100851) Abnormal emotion/affect behavior Very frequent [Orphanet] 85 / 7739
44
(HPO:0000007) Autosomal recessive inheritance 2538 / 7739
45
(HPO:0003577) Congenital onset 133 / 7739