Koolen-De Vries syndrome

General Information (adopted from Orphanet):

Synonyms, Signs: MICRODELETION 17q21.31 SYNDROME
CHROMOSOME 17q21.31 DELETION SYNDROME
kdvs
Number of Symptoms 137
OrphanetNr: 96169
OMIM Id: 610443
ICD-10: Q93.5
UMLs:
MeSH:
MedDRA:
Snomed:

Prevalence, inheritance and age of onset:

Prevalence: No data available.
Inheritance: Autosomal dominant
[Orphanet]
Age of onset: Neonatal
Infancy
[Orphanet]

Disease classification (adopted from Orphanet):

Parent Diseases: Multiple congenital anomalies/dysmorphic syndrome-intellectual deficit
 -Rare developmental defect during embryogenesis
 -Rare genetic disease

Symptom Information: Sort by abundance 

1
(HPO:0000035) Abnormality of the testis Frequent [Orphanet] 296 / 7739
2
(HPO:0000126) Hydronephrosis 119 / 7739
3
(HPO:0000047) Hypospadias Frequent [Orphanet] 250 / 7739
4
(HPO:0000076) Vesicoureteral reflux Occasional [Orphanet] 94 / 7739
5
(HPO:0000072) Hydroureter Occasional [Orphanet] 146 / 7739
6
(HPO:0000069) Abnormality of the ureter Occasional [Orphanet] 47 / 7739
7
(HPO:0000028) Cryptorchidism 71% [HPO] 347 / 7739
8
(HPO:0000275) Narrow face 76 / 7739
9
(HPO:0000194) Open mouth 70 / 7739
10
(HPO:0000414) Bulbous nose typical [HPO] 63 / 7739
11
(HPO:0000691) Microdontia Frequent [Orphanet] 104 / 7739
12
(HPO:0009804) Reduced number of teeth Occasional [Orphanet] 137 / 7739
13
(HPO:0002705) High, narrow palate Frequent [Orphanet] 50 % [HPO:skoehler] 308 / 7739
14
(HPO:0000280) Coarse facial features Frequent [Orphanet] 189 / 7739
15
(HPO:0000252) Microcephaly Occasional [Orphanet] rare [HPO] 832 / 7739
16
(HPO:0000582) Upslanted palpebral fissure Frequent [Orphanet] typical [HPO] 185 / 7739
17
(HPO:0000601) Hypotelorism rare [HPO] 83 / 7739
18
(HPO:0000174) Abnormality of the palate Occasional [Orphanet] 298 / 7739
19
(HPO:0000581) Blepharophimosis Occasional [Orphanet] typical [HPO] 197 / 7739
20
(HPO:0000687) Widely spaced teeth 40 / 7739
21
(HPO:0011822) Broad chin 42 % [HPO:skoehler] 1 / 7739
22
(HPO:0005105) Abnormal nasal morphology Frequent [Orphanet] 114 / 7739
23
(HPO:0000430) Underdeveloped nasal alae Occasional [Orphanet] 90 / 7739
24
(HPO:0000682) Abnormality of dental enamel Occasional [Orphanet] 102 / 7739
25
(HPO:0000286) Epicanthus Frequent [Orphanet] typical [HPO] 371 / 7739
26
(HPO:0000189) Narrow palate common [HPO] 45 / 7739
27
(HPO:0000164) Abnormality of the teeth Frequent [Orphanet] 291 / 7739
28
(HPO:0000348) High forehead Frequent [Orphanet] typical [HPO] 157 / 7739
29
(HPO:0000431) Wide nasal bridge Occasional [Orphanet] 290 / 7739
30
(HPO:0000232) Everted lower lip vermilion Frequent [Orphanet] typical [HPO] 90 / 7739
31
(HPO:0000175) Cleft palate rare [HPO] 349 / 7739
32
(HPO:0000218) High palate common [HPO] 356 / 7739
33
(HPO:0000337) Broad forehead Frequent [Orphanet] typical [HPO] 116 / 7739
34
(HPO:0000204) Cleft upper lip 193 / 7739
35
(HPO:0005487) Prominent metopic ridge rare [HPO] 28 / 7739
36
(HPO:0000276) Long face Frequent [Orphanet] 74 % [HPO:skoehler] 109 / 7739
37
(HPO:0009928) Thick nasal alae Occasional [Orphanet] 21 / 7739
38
(HPO:0000426) Prominent nasal bridge Occasional [Orphanet] 121 / 7739
39
(HPO:0000447) Pear-shaped nose typical [HPO] 5 / 7739
40
(HPO:0008499) High-grade hypermetropia 14 / 7739
41
(HPO:0000508) Ptosis Occasional [Orphanet] typical [HPO] 459 / 7739
42
(HPO:0000540) Hypermetropia Frequent [Orphanet] frequent [HPO] 99 / 7739
43
(HPO:0000518) Cataract Occasional [Orphanet] rare [HPO] 454 / 7739
44
(HPO:0000486) Strabismus Frequent [Orphanet] frequent [HPO] 576 / 7739
45
(HPO:0001488) Bilateral ptosis 42 / 7739
46
(HPO:0000396) Overfolded helix 21 / 7739
47
(HPO:0000400) Macrotia typical [HPO] 108 / 7739
48
(HPO:0008544) Abnormally folded helix Frequent [Orphanet] 24 / 7739
49
(HPO:0000411) Protruding ear Frequent [Orphanet] 140 / 7739
50
(HPO:0000750) Delayed speech and language development typical [HPO] 197 / 7739
51
(HPO:0002465) Poor speech 31 / 7739
52
(HPO:0100024) Conspicuously happy disposition typical [HPO] 5 / 7739
53
(HPO:0002015) Dysphagia Frequent [Orphanet] 301 / 7739
54
(HPO:0001327) Photomyoclonic seizures 125 / 7739
55
(HPO:0001250) Seizures Frequent [Orphanet] 55% [HPO] 1245 / 7739
56
(HPO:0001263) Global developmental delay hallmark [HPO] 853 / 7739
57
(HPO:0002167) Neurological speech impairment Frequent [Orphanet] 308 / 7739
58
(HPO:0001249) Intellectual disability 1089 / 7739
59
(HPO:0006610) Wide intermamillary distance 46 / 7739
60
(HPO:0000821) Hypothyroidism Occasional [Orphanet] 141 / 7739
61
(HPO:0001212) Prominent fingertip pads common [HPO] 12 / 7739
62
(HPO:0002948) Vertebral fusion rare [HPO] 28 / 7739
63
(HPO:0011302) Long palm Frequent [Orphanet] 70 / 7739
64
(HPO:0002650) Scoliosis Occasional [Orphanet] frequent [HPO] 705 / 7739
65
(HPO:0003994) Dislocated wrist 24 / 7739
66
(HPO:0002827) Hip dislocation frequent [HPO] 94 / 7739
67
(HPO:0002999) Patellar dislocation 46 / 7739
68
(HPO:0003042) Elbow dislocation 89 / 7739
69
(HPO:0006006) Hypotrophy of the small hand muscles frequent [HPO] 4 / 7739
70
(HPO:0000915) Pectus excavatum of inferior sternum 21 / 7739
71
(HPO:0001385) Hip dysplasia Frequent [Orphanet] frequent [HPO] 242 / 7739
72
(HPO:0000767) Pectus excavatum Occasional [Orphanet] occasional [HPO] 244 / 7739
73
(HPO:0001373) Joint dislocation 59 / 7739
74
(HPO:0000960) Sacral dimple 29 / 7739
75
(HPO:0001382) Joint hypermobility Frequent [Orphanet] common [HPO] 231 / 7739
76
(HPO:0001166) Arachnodactyly 61 % [HPO:skoehler] 62 / 7739
77
(HPO:0004283) Narrow palm frequent [HPO] 8 / 7739
78
(HPO:0003302) Spondylolisthesis rare [HPO] 14 / 7739
79
(HPO:0012095) Multiple joint dislocation 24 / 7739
80
(HPO:0003179) Protrusio acetabuli 37 / 7739
81
(HPO:0002808) Kyphosis Occasional [Orphanet] frequent [HPO] 289 / 7739
82
(HPO:0003834) Shoulder dislocation 28 / 7739
83
(HPO:0005656) Positional foot deformity frequent [HPO] 2 / 7739
84
(HPO:0006136) Bilateral postaxial polydactyly 30 / 7739
85
(HPO:0005021) Bilateral elbow dislocations 24 / 7739
86
(HPO:0003422) Vertebral segmentation defect Occasional [Orphanet] 95 / 7739
87
(HPO:0002021) Pyloric stenosis Occasional [Orphanet] rare [HPO] 51 / 7739
88
(HPO:0008872) Feeding difficulties in infancy common [HPO] 153 / 7739
89
(HPO:0004322) Short stature Occasional [Orphanet] occasional [HPO] 1232 / 7739
90
(HPO:0001511) Intrauterine growth retardation 358 / 7739
91
(HPO:0001518) Small for gestational age occasional [HPO] 107 / 7739
92
(HPO:0001508) Failure to thrive 454 / 7739
93
(HPO:0000964) Eczema 81 / 7739
94
(HPO:0005599) Hypopigmentation of hair Frequent [Orphanet] 38 / 7739
95
(HPO:0008064) Ichthyosis Occasional [Orphanet] 108 / 7739
96
(HPO:0000958) Dry skin Occasional [Orphanet] 152 / 7739
97
(HPO:0010719) Abnormality of hair texture Frequent [Orphanet] common [HPO] 24 / 7739
98
(HPO:0001631) Atria septal defect 274 / 7739
99
(HPO:0001647) Bicuspid aortic valve 34 / 7739
100
(HPO:0001629) Ventricular septal defect 316 / 7739
101
(HPO:0001724) Aortic dilatation rare [HPO:skoehler] 24 / 7739
102
(HPO:0001642) Pulmonic stenosis 89 / 7739
103
(HPO:0001646) Abnormality of the aortic valve Occasional [Orphanet] 55 / 7739
104
(HPO:0004760) Congenital septal defect Frequent [Orphanet] 69 / 7739
105
(HPO:0003220) Abnormality of chromosome stability Very frequent [Orphanet] 98 / 7739
106
(HPO:0001608) Abnormality of the voice Frequent [Orphanet] 126 / 7739
107
(HPO:0001611) Nasal speech common [HPO] 48 / 7739
108
(HPO:0001252) Muscular hypotonia Very frequent [Orphanet] 990 / 7739
109
(HPO:0008947) Infantile muscular hypotonia 482 / 7739
110
(HPO:0001324) Muscle weakness 859 / 7739
111
(HPO:0010547) Muscle flaccidity 466 / 7739
112
(HPO:0001290) Generalized hypotonia hallmark [HPO] 51 / 7739
113
(OMIM) High, broad forehead 4 / 7739
114
(OMIM) Slender lower limbs (41%) 1 / 7739
115
(OMIM) Tubular nose 3 / 7739
116
(HPO:0000006) Autosomal dominant inheritance 2518 / 7739
117
(HPO:0003745) Sporadic 131 / 7739
118
(OMIM) Friendly behavior (89%) 1 / 7739
119
(HPO:0001466) Contiguous gene syndrome 8 / 7739
120
(HPO:0003828) Variable expressivity 130 / 7739
121
(HPO:0002119) Ventriculomegaly Frequent [Orphanet] 38 % [HPO:skoehler] 253 / 7739
122
(OMIM) Abnormal hair pigmentation (55%) 1 / 7739
123
(HPO:0040080) Anteverted ears 6 / 7739
124
(OMIM) Kidney/urologic anomalies (32%) 1 / 7739
125
(OMIM) Scoliosis/kyphosis (36%) 1 / 7739
126
(HPO:0012758) Neurodevelopmental delay Very frequent [Orphanet] 949 / 7739
127
(OMIM) Hypermobile joints 3 / 7739
128
(OMIM) Duplex renal system 1 / 7739
129
(MedDRA:10019049) Hair texture abnormal 1 / 7739
130
(OMIM) Pale irides (45%) 1 / 7739
131
(HPO:0007370) Aplasia/Hypoplasia of the corpus callosum Frequent [Orphanet] 180 / 7739
132
(OMIM) Mental retardation, mild to severe 14 / 7739
133
(OMIM) Heart defect 2 / 7739
134
(OMIM) Small and widely spaced teeth 4 / 7739
135
(OMIM) Hypoplasia of the hand muscles 2 / 7739
136
(OMIM) Pigmentary abnormalities 3 / 7739
137
(OMIM) Anteverted ears 5 / 7739

Associated genes:

ClinVar (via SNiPA)

Gene symbol Variation Clinical significance Reference

Additional Information:

Description: (OMIM) Koolen-De Vries syndrome is characterized by moderate to severe intellectual disability, hypotonia, friendly demeanor, and highly distinctive facial features, including tall, broad forehead, long face, upslanting palpebral fissures, epicanthal folds, tubular nose with bulbous nasal tip, and large ...
Clinical Description OMIM Using array-based comparative genomic hybridization (array CGH) in a study of 1,200 mentally retarded individuals, Koolen et al. (2006) identified 3 individuals with interstitial, overlapping 17q21.31 microdeletions and a clearly recognizable clinical phenotype of mental retardation, hypotonia, and ...
Molecular genetics OMIM Among 11 patients with 17q21.31 deletion syndrome, Tan et al. (2009) found that the deletions ranged from 0.44 to 0.68 Mb in size, and included the CRHR1 (122561), MAPT (157140), IMP5 (608284),and STH (607067) genes, and part of ...
Population genetics OMIM Koolen et al. (2008) estimated the prevalence of the syndrome to be 1 in 16,000 and suggested that it is currently underdiagnosed.
Diagnosis GeneReviews The clinical spectrum of the KANSL1-related intellectual disability syndrome is variable. Besides developmental delay and intellectual disability, no single clinical feature is required to establish the diagnosis, although childhood hypotonia is a common feature, reported in almost all affected individuals....
Clinical Description GeneReviews The KANSL1-related intellectual disability syndrome has a clinically recognizable phenotype that includes developmental delay/intellectual disability, neonatal/childhood hypotonia, dysmorphisms (Figure 1), congenital malformations and behavioral features (Table 2). Males and females are affected equally. ...
Differential Diagnosis GeneReviews The most common findings in the KANSL1-related intellectual disability syndrome, developmental delay and childhood hypotonia, are common and relatively nonspecific indications for molecular cytogenetic analysis. However, the concurrent finding of characteristic facial dysmorphic features, epilepsy, hypermetropia, congenital heart defects, renal or urologic anomalies, cryptorchidism, and/or friendly/amiable behavior may prompt specific consideration of the diagnosis of KANSL1-related intellectual disability syndrome. Other diagnoses that may be considered in affected individuals include:...
Management GeneReviews To establish the clinical consequences in an individual diagnosed with KANSL1-related intellectual disability syndrome, the following evaluations are recommended:...
Molecular genetics GeneReviews Information in the Molecular Genetics and OMIM tables may differ from that elsewhere in the GeneReview: tables may contain more recent information. —ED....