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Okur-chung neurodevelopmental syndrome(OCNDS)

MedGen UID:
934706
Concept ID:
C4310739
Disease or Syndrome
Synonyms: OCNDS
Modes of inheritance:
Autosomal dominant inheritance
MedGen UID:
141047
Concept ID:
C0443147
Intellectual Product
Sources: HPO, OMIM, Orphanet
A mode of inheritance that is observed for traits related to a gene encoded on one of the autosomes (i.e., the human chromosomes 1-22) in which a trait manifests in heterozygotes. In the context of medical genetics, an autosomal dominant disorder is caused when a single copy of the mutant allele is present. Males and females are affected equally, and can both transmit the disorder with a risk of 50% for each child of inheriting the mutant allele.
Autosomal dominant inheritance (HPO, OMIM, Orphanet)
 
Gene (location): CSNK2A1 (20p13)
OMIM®: 617062

Definition

Okur-Chung neurodevelopmental syndrome is an autosomal dominant disorder characterized by delayed psychomotor development, intellectual disability with poor speech, behavioral abnormalities, cortical malformations in some patients, and variable dysmorphic facial features. Additional features, including microcephaly, gastrointestinal problems, and low levels of immunoglobulins, may be observed in some patients (Okur et al., 2016). [from OMIM]

Clinical features

From HPO
Ptosis
MedGen UID:
2287
Concept ID:
C0005745
Disease or Syndrome
Drooping of the upper lid due to deficient development or paralysis of the levator palpebrae muscle.
Constipation
MedGen UID:
1101
Concept ID:
C0009806
Sign or Symptom
Infrequent or difficult evacuation of FECES. These symptoms are associated with a variety of causes, including low DIETARY FIBER intake, emotional or nervous disturbances, systemic and structural disorders, drug-induced aggravation, and infections.
Hypertelorism
MedGen UID:
9373
Concept ID:
C0020534
Finding
Although hypertelorism means an excessive distance between any paired organs (e.g., the nipples), the use of the word has come to be confined to ocular hypertelorism. Hypertelorism occurs as an isolated feature and is also a feature of many syndromes, e.g., Opitz G syndrome (145410), Greig cephalopolysyndactyly (175700), and Noonan syndrome (163950) (summary by Cohen et al., 1995).
Micrognathia
MedGen UID:
44428
Concept ID:
C0025990
Congenital Abnormality
A congenital abnormality of the jaws (particularly the mandible) in which they are unusually small. This condition is not always pathological and may correct itself as the patient matures; however, it may also present as a birth defect in multiple syndromes.
Scoliosis
MedGen UID:
21278
Concept ID:
C0037932
Finding
The presence of an abnormal lateral curvature of the spine.
IgG deficiency
MedGen UID:
56446
Concept ID:
C0162539
Disease or Syndrome
An abnormally decreased level of immunoglobulin G (IgG) in blood.
Brachydactyly
MedGen UID:
67454
Concept ID:
C0221357
Congenital Abnormality
Congenital anomaly of abnormally short fingers or toes.
Failure to thrive
MedGen UID:
115900
Concept ID:
C0231246
Finding
Failure to thrive (FTT) refers to a child whose physical growth is substantially below the norm.
Feeding difficulties
MedGen UID:
65429
Concept ID:
C0232466
Finding
Impaired ability to eat related to problems gathering food and getting ready to suck, chew, or swallow it.
Low-set ears
MedGen UID:
65980
Concept ID:
C0239234
Congenital Abnormality
Upper insertion of the ear to the scalp below an imaginary horizontal line drawn between the inner canthi of the eye and extending posteriorly to the ear.
High palate
MedGen UID:
66814
Concept ID:
C0240635
Congenital Abnormality
Height of the palate more than 2 SD above the mean (objective) or palatal height at the level of the first permanent molar more than twice the height of the teeth (subjective).
Finger clinodactyly
MedGen UID:
120550
Concept ID:
C0265610
Congenital Abnormality
An angulation of a digit at an interphalangeal joint in the plane of the palm (finger) or sole (toe).
Macrogyria
MedGen UID:
120579
Concept ID:
C0266483
Congenital Abnormality
A congenital abnormality of the cerebral hemisphere chacterized by unusually thick gyrations (convolutions) of the cerebral cortex.
Microcephaly
MedGen UID:
473122
Concept ID:
C0424688
Finding
Occipito-frontal (head) circumference (OFC) less than -3 standard deviations compared to appropriate, age matched, normal standards (Ross JJ, Frias JL 1977, PMID:9683597). Alternatively, decreased size of the cranium.
Synophrys
MedGen UID:
98132
Concept ID:
C0431447
Congenital Abnormality
Meeting of the medial eyebrows in the midline.
Delayed speech and language development
MedGen UID:
105318
Concept ID:
C0454644
Finding
A degree of language development that is significantly below the norm for a child of a specified age.
IgA deficiency
MedGen UID:
107506
Concept ID:
C0553533
Finding
Decreased levels of immunoglobulin A (IgA).
Epicanthus
MedGen UID:
151862
Concept ID:
C0678230
Congenital Abnormality
Epicanthus is a condition in which a fold of skin stretches from the upper to the lower eyelid, partially covering the inner canthus. Usher (1935) noted that epicanthus is a normal finding in the fetus of all races. Epicanthus also occurs in association with hereditary ptosis (110100).
Attention deficit hyperactivity disorder
MedGen UID:
220387
Concept ID:
C1263846
Mental or Behavioral Dysfunction
A behavior disorder originating in childhood in which the essential features are signs of developmentally inappropriate inattention, impulsivity, and hyperactivity. Although most individuals have symptoms of both inattention and hyperactivity-impulsivity, one or the other pattern may be predominant. The disorder is more frequent in males than females. Onset is in childhood. Symptoms often attenuate during late adolescence although a minority experience the full complement of symptoms into mid-adulthood. (From DSM-V)
Atonic seizures
MedGen UID:
324532
Concept ID:
C1836509
Finding
Seizures characterized by a sudden loss or diminution of muscle tone, which may be fragmentary, confined to a segment (limb, jaw, head), or massive, leading to a slumping to the ground .
Anteverted nares
MedGen UID:
326648
Concept ID:
C1840077
Finding
Anteriorly-facing nostrils viewed with the head in the Frankfurt horizontal and the eyes of the observer level with the eyes of the subject. This gives the appearance of an upturned nose (upturned nasal tip).
Intellectual disability
MedGen UID:
334384
Concept ID:
C1843367
Finding
Joint hypermobility
MedGen UID:
336793
Concept ID:
C1844820
Finding
The ability of a joint to move beyond its normal range of motion.
Wide nasal bridge
MedGen UID:
341441
Concept ID:
C1849367
Finding
Increased breadth of the nasal bridge (and with it, the nasal root).
Generalized hypotonia
MedGen UID:
346841
Concept ID:
C1858120
Finding
Generalized muscular hypotonia (abnormally low muscle tone).
Thin upper lip vermilion
MedGen UID:
355352
Concept ID:
C1865017
Finding
Height of the vermilion of the upper lip in the midline more than 2 SD below the mean. Alternatively, an apparently reduced height of the vermilion of the upper lip in the frontal view (subjective).
Cortical gyral simplification
MedGen UID:
413664
Concept ID:
C2749675
Finding
An abnormal reduction of the number and complexity of the pattern of gyrations of the cerebral cortex.
Highly arched eyebrow
MedGen UID:
892999
Concept ID:
C4020849
Finding
Increased height of the central portion of the eyebrow, forming a crescent, semicircular, or inverted U shape.
Global developmental delay
MedGen UID:
892935
Concept ID:
C4020875
Pathologic Function
A delay in the achievement of motor or mental milestones in the domains of development of a child, including motor skills, speech and language, cognitive skills, and social and emotional skills. This term should only be used to describe children younger than five years of age.

Recent clinical studies

Diagnosis

Owen CI, Bowden R, Parker MJ, Patterson J, Patterson J, Price S, Sarkar A, Castle B, Deshpande C, Splitt M, Ghali N, Dean J, Green AJ, Crosby C; Deciphering Developmental Disorders Study., Tatton-Brown K
Am J Med Genet A 2018 May;176(5):1108-1114. Epub 2018 Jan 31 doi: 10.1002/ajmg.a.38610. PMID: 29383814

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