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
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ICD-10: |
Q93.5 |
UMLs: |
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MeSH: |
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MedDRA: |
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Snomed: |
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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:
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(HPO:0000035) | Abnormality of the testis | Frequent [Orphanet] | 296 / 7739 | |||
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(HPO:0000126) | Hydronephrosis | 119 / 7739 | ||||
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(HPO:0000047) | Hypospadias | Frequent [Orphanet] | 250 / 7739 | |||
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(HPO:0000076) | Vesicoureteral reflux | Occasional [Orphanet] | 94 / 7739 | |||
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(HPO:0000072) | Hydroureter | Occasional [Orphanet] | 146 / 7739 | |||
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(HPO:0000069) | Abnormality of the ureter | Occasional [Orphanet] | 47 / 7739 | |||
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(HPO:0000028) | Cryptorchidism | 71% [HPO] | 347 / 7739 | |||
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(HPO:0000275) | Narrow face | 76 / 7739 | ||||
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(HPO:0000194) | Open mouth | 70 / 7739 | ||||
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(HPO:0000414) | Bulbous nose | typical [HPO] | 63 / 7739 | |||
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(HPO:0000691) | Microdontia | Frequent [Orphanet] | 104 / 7739 | |||
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(HPO:0009804) | Reduced number of teeth | Occasional [Orphanet] | 137 / 7739 | |||
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(HPO:0002705) | High, narrow palate | Frequent [Orphanet] 50 % [HPO:skoehler] | 308 / 7739 | |||
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(HPO:0000280) | Coarse facial features | Frequent [Orphanet] | 189 / 7739 | |||
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(HPO:0000252) | Microcephaly | Occasional [Orphanet] rare [HPO] | 832 / 7739 | |||
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(HPO:0000582) | Upslanted palpebral fissure | Frequent [Orphanet] typical [HPO] | 185 / 7739 | |||
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(HPO:0000601) | Hypotelorism | rare [HPO] | 83 / 7739 | |||
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(HPO:0000174) | Abnormality of the palate | Occasional [Orphanet] | 298 / 7739 | |||
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(HPO:0000581) | Blepharophimosis | Occasional [Orphanet] typical [HPO] | 197 / 7739 | |||
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(HPO:0000687) | Widely spaced teeth | 40 / 7739 | ||||
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(HPO:0011822) | Broad chin | 42 % [HPO:skoehler] | 1 / 7739 | |||
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(HPO:0005105) | Abnormal nasal morphology | Frequent [Orphanet] | 114 / 7739 | |||
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(HPO:0000430) | Underdeveloped nasal alae | Occasional [Orphanet] | 90 / 7739 | |||
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(HPO:0000682) | Abnormality of dental enamel | Occasional [Orphanet] | 102 / 7739 | |||
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(HPO:0000286) | Epicanthus | Frequent [Orphanet] typical [HPO] | 371 / 7739 | |||
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(HPO:0000189) | Narrow palate | common [HPO] | 45 / 7739 | |||
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(HPO:0000164) | Abnormality of the teeth | Frequent [Orphanet] | 291 / 7739 | |||
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(HPO:0000348) | High forehead | Frequent [Orphanet] typical [HPO] | 157 / 7739 | |||
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(HPO:0000431) | Wide nasal bridge | Occasional [Orphanet] | 290 / 7739 | |||
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(HPO:0000232) | Everted lower lip vermilion | Frequent [Orphanet] typical [HPO] | 90 / 7739 | |||
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(HPO:0000175) | Cleft palate | rare [HPO] | 349 / 7739 | |||
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(HPO:0000218) | High palate | common [HPO] | 356 / 7739 | |||
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(HPO:0000337) | Broad forehead | Frequent [Orphanet] typical [HPO] | 116 / 7739 | |||
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(HPO:0000204) | Cleft upper lip | 193 / 7739 | ||||
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(HPO:0005487) | Prominent metopic ridge | rare [HPO] | 28 / 7739 | |||
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(HPO:0000276) | Long face | Frequent [Orphanet] 74 % [HPO:skoehler] | 109 / 7739 | |||
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(HPO:0009928) | Thick nasal alae | Occasional [Orphanet] | 21 / 7739 | |||
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(HPO:0000426) | Prominent nasal bridge | Occasional [Orphanet] | 121 / 7739 | |||
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(HPO:0000447) | Pear-shaped nose | typical [HPO] | 5 / 7739 | |||
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(HPO:0008499) | High-grade hypermetropia | 14 / 7739 | ||||
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(HPO:0000508) | Ptosis | Occasional [Orphanet] typical [HPO] | 459 / 7739 | |||
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(HPO:0000540) | Hypermetropia | Frequent [Orphanet] frequent [HPO] | 99 / 7739 | |||
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(HPO:0000518) | Cataract | Occasional [Orphanet] rare [HPO] | 454 / 7739 | |||
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(HPO:0000486) | Strabismus | Frequent [Orphanet] frequent [HPO] | 576 / 7739 | |||
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(HPO:0001488) | Bilateral ptosis | 42 / 7739 | ||||
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(HPO:0000396) | Overfolded helix | 21 / 7739 | ||||
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(HPO:0000400) | Macrotia | typical [HPO] | 108 / 7739 | |||
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(HPO:0008544) | Abnormally folded helix | Frequent [Orphanet] | 24 / 7739 | |||
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(HPO:0000411) | Protruding ear | Frequent [Orphanet] | 140 / 7739 | |||
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(HPO:0000750) | Delayed speech and language development | typical [HPO] | 197 / 7739 | |||
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(HPO:0002465) | Poor speech | 31 / 7739 | ||||
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(HPO:0100024) | Conspicuously happy disposition | typical [HPO] | 5 / 7739 | |||
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(HPO:0002015) | Dysphagia | Frequent [Orphanet] | 301 / 7739 | |||
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(HPO:0001327) | Photomyoclonic seizures | 125 / 7739 | ||||
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(HPO:0001250) | Seizures | Frequent [Orphanet] 55% [HPO] | 1245 / 7739 | |||
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(HPO:0001263) | Global developmental delay | hallmark [HPO] | 853 / 7739 | |||
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(HPO:0002167) | Neurological speech impairment | Frequent [Orphanet] | 308 / 7739 | |||
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(HPO:0001249) | Intellectual disability | 1089 / 7739 | ||||
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(HPO:0006610) | Wide intermamillary distance | 46 / 7739 | ||||
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(HPO:0000821) | Hypothyroidism | Occasional [Orphanet] | 141 / 7739 | |||
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(HPO:0001212) | Prominent fingertip pads | common [HPO] | 12 / 7739 | |||
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(HPO:0002948) | Vertebral fusion | rare [HPO] | 28 / 7739 | |||
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(HPO:0011302) | Long palm | Frequent [Orphanet] | 70 / 7739 | |||
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(HPO:0002650) | Scoliosis | Occasional [Orphanet] frequent [HPO] | 705 / 7739 | |||
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(HPO:0003994) | Dislocated wrist | 24 / 7739 | ||||
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(HPO:0002827) | Hip dislocation | frequent [HPO] | 94 / 7739 | |||
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(HPO:0002999) | Patellar dislocation | 46 / 7739 | ||||
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(HPO:0003042) | Elbow dislocation | 89 / 7739 | ||||
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(HPO:0006006) | Hypotrophy of the small hand muscles | frequent [HPO] | 4 / 7739 | |||
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(HPO:0000915) | Pectus excavatum of inferior sternum | 21 / 7739 | ||||
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(HPO:0001385) | Hip dysplasia | Frequent [Orphanet] frequent [HPO] | 242 / 7739 | |||
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(HPO:0000767) | Pectus excavatum | Occasional [Orphanet] occasional [HPO] | 244 / 7739 | |||
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(HPO:0001373) | Joint dislocation | 59 / 7739 | ||||
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(HPO:0000960) | Sacral dimple | 29 / 7739 | ||||
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(HPO:0001382) | Joint hypermobility | Frequent [Orphanet] common [HPO] | 231 / 7739 | |||
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(HPO:0001166) | Arachnodactyly | 61 % [HPO:skoehler] | 62 / 7739 | |||
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(HPO:0004283) | Narrow palm | frequent [HPO] | 8 / 7739 | |||
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(HPO:0003302) | Spondylolisthesis | rare [HPO] | 14 / 7739 | |||
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(HPO:0012095) | Multiple joint dislocation | 24 / 7739 | ||||
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(HPO:0003179) | Protrusio acetabuli | 37 / 7739 | ||||
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(HPO:0002808) | Kyphosis | Occasional [Orphanet] frequent [HPO] | 289 / 7739 | |||
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(HPO:0003834) | Shoulder dislocation | 28 / 7739 | ||||
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(HPO:0005656) | Positional foot deformity | frequent [HPO] | 2 / 7739 | |||
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(HPO:0006136) | Bilateral postaxial polydactyly | 30 / 7739 | ||||
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(HPO:0005021) | Bilateral elbow dislocations | 24 / 7739 | ||||
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(HPO:0003422) | Vertebral segmentation defect | Occasional [Orphanet] | 95 / 7739 | |||
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(HPO:0002021) | Pyloric stenosis | Occasional [Orphanet] rare [HPO] | 51 / 7739 | |||
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(HPO:0008872) | Feeding difficulties in infancy | common [HPO] | 153 / 7739 | |||
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(HPO:0004322) | Short stature | Occasional [Orphanet] occasional [HPO] | 1232 / 7739 | |||
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(HPO:0001511) | Intrauterine growth retardation | 358 / 7739 | ||||
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(HPO:0001518) | Small for gestational age | occasional [HPO] | 107 / 7739 | |||
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(HPO:0001508) | Failure to thrive | 454 / 7739 | ||||
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(HPO:0000964) | Eczema | 81 / 7739 | ||||
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(HPO:0005599) | Hypopigmentation of hair | Frequent [Orphanet] | 38 / 7739 | |||
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(HPO:0008064) | Ichthyosis | Occasional [Orphanet] | 108 / 7739 | |||
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(HPO:0000958) | Dry skin | Occasional [Orphanet] | 152 / 7739 | |||
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(HPO:0010719) | Abnormality of hair texture | Frequent [Orphanet] common [HPO] | 24 / 7739 | |||
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(HPO:0001631) | Atria septal defect | 274 / 7739 | ||||
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(HPO:0001647) | Bicuspid aortic valve | 34 / 7739 | ||||
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(HPO:0001629) | Ventricular septal defect | 316 / 7739 | ||||
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(HPO:0001724) | Aortic dilatation | rare [HPO:skoehler] | 24 / 7739 | |||
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(HPO:0001642) | Pulmonic stenosis | 89 / 7739 | ||||
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(HPO:0001646) | Abnormality of the aortic valve | Occasional [Orphanet] | 55 / 7739 | |||
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(HPO:0004760) | Congenital septal defect | Frequent [Orphanet] | 69 / 7739 | |||
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(HPO:0003220) | Abnormality of chromosome stability | Very frequent [Orphanet] | 98 / 7739 | |||
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(HPO:0001608) | Abnormality of the voice | Frequent [Orphanet] | 126 / 7739 | |||
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(HPO:0001611) | Nasal speech | common [HPO] | 48 / 7739 | |||
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(HPO:0001252) | Muscular hypotonia | Very frequent [Orphanet] | 990 / 7739 | |||
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(HPO:0008947) | Infantile muscular hypotonia | 482 / 7739 | ||||
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(HPO:0001324) | Muscle weakness | 859 / 7739 | ||||
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(HPO:0010547) | Muscle flaccidity | 466 / 7739 | ||||
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(HPO:0001290) | Generalized hypotonia | hallmark [HPO] | 51 / 7739 | |||
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(OMIM) | High, broad forehead | 4 / 7739 | ||||
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(OMIM) | Slender lower limbs (41%) | 1 / 7739 | ||||
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(OMIM) | Tubular nose | 3 / 7739 | ||||
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(HPO:0000006) | Autosomal dominant inheritance | 2518 / 7739 | ||||
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(HPO:0003745) | Sporadic | 131 / 7739 | ||||
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(OMIM) | Friendly behavior (89%) | 1 / 7739 | ||||
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(HPO:0001466) | Contiguous gene syndrome | 8 / 7739 | ||||
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(HPO:0003828) | Variable expressivity | 130 / 7739 | ||||
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(HPO:0002119) | Ventriculomegaly | Frequent [Orphanet] 38 % [HPO:skoehler] | 253 / 7739 | |||
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(OMIM) | Abnormal hair pigmentation (55%) | 1 / 7739 | ||||
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(HPO:0040080) | Anteverted ears | 6 / 7739 | ||||
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(OMIM) | Kidney/urologic anomalies (32%) | 1 / 7739 | ||||
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(OMIM) | Scoliosis/kyphosis (36%) | 1 / 7739 | ||||
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(HPO:0012758) | Neurodevelopmental delay | Very frequent [Orphanet] | 949 / 7739 | |||
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(OMIM) | Hypermobile joints | 3 / 7739 | ||||
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(OMIM) | Duplex renal system | 1 / 7739 | ||||
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(MedDRA:10019049) | Hair texture abnormal | 1 / 7739 | ||||
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(OMIM) | Pale irides (45%) | 1 / 7739 | ||||
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(HPO:0007370) | Aplasia/Hypoplasia of the corpus callosum | Frequent [Orphanet] | 180 / 7739 | |||
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(OMIM) | Mental retardation, mild to severe | 14 / 7739 | ||||
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(OMIM) | Heart defect | 2 / 7739 | ||||
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(OMIM) | Small and widely spaced teeth | 4 / 7739 | ||||
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(OMIM) | Hypoplasia of the hand muscles | 2 / 7739 | ||||
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(OMIM) | Pigmentary abnormalities | 3 / 7739 | ||||
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(OMIM) | Anteverted ears | 5 / 7739 |
Associated genes:
ClinVar (via SNiPA)
Gene symbol | Variation | Clinical significance | Reference |
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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.... Gene SymbolTest MethodMutations DetectedMutation Detection Frequency by Test Method 1Test AvailabilityKANSL1Deletion / duplication analysis 2, 3 | ~600-kb deletion at 17q21.31 that includes KANSL1~95% 4ClinicalSequence analysisSequence variants 5~5% 4Genotyping 6Not applicableNot applicableResearch only1. The ability of the test method used to detect a mutation that is present in the indicated gene2. Testing that identifies deletions/duplications not readily detectable by sequence analysis of the coding and flanking intronic regions of genomic DNA; included in the variety of methods that may be used are: quantitative PCR, long-range PCR, multiplex ligation-dependent probe amplification (MLPA), and chromosomal microarray (CMA) that includes this gene/chromosome segment. 3. Methods may be genomic microarrays or targeted. BAC or oligonucleotide arrays or genotyping arrays can detect the common deletion in a proband. Targeted methods including fluorescence in situ hybridization (FISH) and multiplex ligation-dependent probe amplification (MLPA) can be used if the syndrome is suspected clinically or for confirmation of the deletion after genomic microarray analysis. Targeted approaches can also be used for evaluating relatives of the proband for presence of the deletion.4. The majority of affected individuals are identified by a genome-wide CMA screen for deletions/duplications. CMA using BAC, oligonucleotide, or SNP genotyping arrays can detect the deletion in a proband. The ability to size the deletion depends on the type of microarray used and the density of probes in the 17q21.3 region. It is too early to ascertain the frequency of the 17q21.31 microdeletion and a KANSL1 mutation. Given the fact that the chromosomal locus involved is flanked by segmental duplications, predisposing the locus to undergo deletion, it is likely that the recurrent microdeletion occurs more frequently. 5. Examples of mutations detected by sequence analysis may include small intragenic deletions/insertions and missense, nonsense, and splice site mutations; typically, exonic or whole-gene deletions/duplications are not detected. 6. To date, testing in all unaffected parents from whom the deleted chromosome 17 originated has shown a 900-kb inversion involving chromosome 17q21.31. The frequency of this inversion (also referred to as the H2 lineage) in these parents is significantly greater than the ~20% frequency of the inversion found in the European population as a whole [Stefansson et al 2005] (p<10-5, Pearson’s Chi square test) [Koolen et al 2008]. Testing for the inversion is not routinely indicated (see Molecular Genetics).Interpretation of test resultsDeletion analysis. Depending on the initial test, validation of the deletion by an independent method may be warranted. If a high-density or targeted oligonucleotide genomic microarray platform that provides very dense coverage of the 17q21.31 region has been used for identification of the deletion, further validation may not be necessary, as it is unlikely that more than 50-100 adjacent DNA targets show an abnormal copy number by chance.Sequence analysis. For issues to consider in interpretation of sequence analysis results, click here.
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. ... Frequency 1FeaturesVery common (>75% of individuals) | Distinctive facial features (see Clinical Diagnosis)Developmental delay/ intellectual disabilityHypotonia (childhood)Friendly/amiable dispositionCommon (50%-75%)EpilepsyMultiple nevi and other pigmentary skin and hair abnormalitiesNasal speechNarrow/high palateDental anomaliesSlender/long fingersJoint hypermobility and/or joint dislocation/dysplasiaStructural CNS anomaliesRenal & urogenital anomalies Less common (25%-50%)Heart defectsHypermetropiaStrabismusNarrow handsHypoplasia hand musclesHip dislocation/ dysplasiaPersistence of fingertip padsSlender lower limbsPositional deformity of the feetScoliosis/ kyphosisOccasional (10%-25%)Hearing loss due to chronic otitis mediaLow birth weightShort statureAbnormal head shape 2Pectus excavatumInfrequent (<10%)Cleft lip/palateMicrocephalyCataractPyloric stenosisFused vertebraeSpondylolisthesisHypothyroidism1. Koolen et al [2008], Tan et al [2009], www
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.... Gene SymbolChromosomal LocusProtein NameLocus SpecificHGMDNot applicable17q21 | Not applicable KANSL117q21