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Chromosome 17q11.2 deletion syndrome, 1.4Mb

MedGen UID:
1726802
Concept ID:
C5401456
Disease or Syndrome
Synonyms: Chromosome 17q11.2 deletion syndrome, 1.4 MB; NEUROFIBROMATOSIS 1 MICRODELETION SYNDROME; NF1 MICRODELETION SYNDROME; Overgrowth-macrocephaly-facial dysmorphism syndrome; VAN ASPEREN SYNDROME
SNOMED CT: 17q11 deletion syndrome (880093002); Neurofibromatosis type 1 microdeletion syndrome (880093002); Monosomy 17q11 (880093002); Chromosome 17q11.2 deletion syndrome (880093002)
 
Monarch Initiative: MONDO:0013357
OMIM®: 613675
Orphanet: ORPHA97685

Definition

Approximately 5 to 20% of all patients with neurofibromatosis type I (162200) carry a heterozygous deletion of approximately 1.4 Mb involving the NF1 gene and contiguous genes lying in its flanking regions (Riva et al., 2000; Jenne et al., 2001), which is caused by nonallelic homologous recombination of NF1 repeats A and C (Dorschner et al., 2000). The 'NF1 microdeletion syndrome' is often characterized by a more severe phenotype than that observed in the majority of NF1 patients. In particular, patients with NF1 microdeletion often show variable facial dysmorphism, mental retardation, developmental delay, an excessive number of early-onset neurofibromas (Venturin et al., 2004), and an increased risk for malignant peripheral nerve sheath tumors (De Raedt et al., 2003). [from OMIM]

Clinical features

From HPO
Neurofibrosarcoma
MedGen UID:
104927
Concept ID:
C0206729
Neoplastic Process
A form of malignant cancer of the connective tissue surrounding nerves. Given its origin and behavior, it is classified as a sarcoma.
Large hands
MedGen UID:
98097
Concept ID:
C0426870
Finding
Long foot
MedGen UID:
154365
Concept ID:
C0576225
Finding
Increased back to front length of the foot.
Pes cavus
MedGen UID:
675590
Concept ID:
C0728829
Congenital Abnormality
An increase in height of the medial longitudinal arch of the foot that does not flatten on weight bearing (i.e., a distinctly hollow form of the sole of the foot when it is bearing weight).
Abnormal heart morphology
MedGen UID:
6748
Concept ID:
C0018798
Congenital Abnormality
Any structural anomaly of the heart.
Abnormal cardiovascular system morphology
MedGen UID:
892473
Concept ID:
C4049796
Congenital Abnormality
Any structural anomaly of the heart and blood vessels.
Tall stature
MedGen UID:
69137
Concept ID:
C0241240
Finding
A height above that which is expected according to age and gender norms.
Overgrowth
MedGen UID:
376550
Concept ID:
C1849265
Finding
Excessive postnatal growth which may comprise increased weight, increased length, and/or increased head circumference.
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.
Hearing impairment
MedGen UID:
235586
Concept ID:
C1384666
Disease or Syndrome
A decreased magnitude of the sensory perception of sound.
Seizure
MedGen UID:
20693
Concept ID:
C0036572
Sign or Symptom
A seizure is an intermittent abnormality of nervous system physiology characterized by a transient occurrence of signs and/or symptoms due to abnormal excessive or synchronous neuronal activity in the brain.
Neurofibromatosis
MedGen UID:
58149
Concept ID:
C0162678
Neoplastic Process
A benign peripheral nerve sheath tumor that generally appears as a soft, skin-colored papule or small subcutaneous nodule. Individuals with neurofibromatosis can have numerous neurofibromas.
Plexiform neurofibroma
MedGen UID:
64640
Concept ID:
C0206728
Neoplastic Process
A neurofibroma in which Schwann cells proliferate inside the nerve sheath, producing an irregularly thickened, distorted, tortuous structure.
Short attention span
MedGen UID:
82652
Concept ID:
C0262630
Finding
Reduced attention span characterized by distractibility and impulsivity.
Cognitive impairment
MedGen UID:
90932
Concept ID:
C0338656
Mental or Behavioral Dysfunction
Abnormal cognition is characterized by deficits in thinking, reasoning, or remembering.
Optic nerve glioma
MedGen UID:
138056
Concept ID:
C0346326
Neoplastic Process
A glioma originating in the optic nerve or optic chiasm.
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.
Global developmental delay
MedGen UID:
107838
Concept ID:
C0557874
Finding
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.
Attention deficit hyperactivity disorder
MedGen UID:
220387
Concept ID:
C1263846
Mental or Behavioral Dysfunction
Attention-deficit/hyperactivity disorder (ADHD) is a behavioral disorder that typically begins in childhood and is characterized by a short attention span (inattention), an inability to be calm and stay still (hyperactivity), and poor impulse control (impulsivity). Some people with ADHD have problems with only inattention or with hyperactivity and impulsivity, but most have problems related to all three features.\n\nIn people with ADHD, the characteristic behaviors are frequent and severe enough to interfere with the activities of daily living such as school, work, and relationships with others. Because of an inability to stay focused on tasks, people with inattention may be easily distracted, forgetful, avoid tasks that require sustained attention, have difficulty organizing tasks, or frequently lose items.\n\nIn most affected individuals, ADHD continues throughout life, but in about one-third of individuals, signs and symptoms of ADHD go away by adulthood.\n\nHyperactivity is usually shown by frequent movement. Individuals with this feature often fidget or tap their foot when seated, leave their seat when it is inappropriate to do so (such as in the classroom), or talk a lot and interrupt others.\n\nImpulsivity can result in hasty actions without thought for the consequences. Individuals with poor impulse control may have difficulty waiting for their turn, deferring to others, or considering their actions before acting.\n\nMore than two-thirds of all individuals with ADHD have additional conditions, including insomnia, mood or anxiety disorders, learning disorders, or substance use disorders. Affected individuals may also have autism spectrum disorder, which is characterized by impaired communication and social interaction, or Tourette syndrome, which is a disorder characterized by repetitive and involuntary movements or noises called tics.
Subcutaneous neurofibroma
MedGen UID:
741742
Concept ID:
C1827970
Neoplastic Process
A neurofibroma (benign peripheral nerve sheath tumor) localized in the subcutis (subcutaneous region).
Intellectual disability
MedGen UID:
811461
Concept ID:
C3714756
Mental or Behavioral Dysfunction
Intellectual disability, previously referred to as mental retardation, is characterized by subnormal intellectual functioning that occurs during the developmental period. It is defined by an IQ score below 70.
Morphological central nervous system abnormality
MedGen UID:
892343
Concept ID:
C4021765
Anatomical Abnormality
A structural abnormality of the central nervous system.
Spinal neurofibroma
MedGen UID:
869787
Concept ID:
C4024217
Neoplastic Process
A neurofibroma (benign peripheral nerve sheath tumor) localized in the spine.
Focal T2 hyperintense basal ganglia lesion
MedGen UID:
892349
Concept ID:
C4024926
Finding
A lighter than expected T2 signal on magnetic resonance imaging (MRI) of the basal ganglia. This term refers to a localized hyperintensity affecting a particular region of the basal ganglia.
Specific learning disability
MedGen UID:
871302
Concept ID:
C4025790
Mental or Behavioral Dysfunction
Impairment of certain skills such as reading or writing, coordination, self-control, or attention that interfere with the ability to learn. The impairment is not related to a global deficiency of intelligence.
Bone cyst
MedGen UID:
2696
Concept ID:
C0005937
Anatomical Abnormality
A fluid filled cavity that develops with a bone.
Hypotonia
MedGen UID:
10133
Concept ID:
C0026827
Finding
Hypotonia is an abnormally low muscle tone (the amount of tension or resistance to movement in a muscle). Even when relaxed, muscles have a continuous and passive partial contraction which provides some resistance to passive stretching. Hypotonia thus manifests as diminished resistance to passive stretching. Hypotonia is not the same as muscle weakness, although the two conditions can co-exist.
Scoliosis
MedGen UID:
11348
Concept ID:
C0036439
Disease or Syndrome
The presence of an abnormal lateral curvature of the spine.
Joint hypermobility
MedGen UID:
336793
Concept ID:
C1844820
Finding
The capability that a joint (or a group of joints) has to move, passively and/or actively, beyond normal limits along physiological axes.
Generalized hypotonia
MedGen UID:
346841
Concept ID:
C1858120
Finding
Generalized muscular hypotonia (abnormally low muscle tone).
Pectus excavatum
MedGen UID:
781174
Concept ID:
C2051831
Finding
A defect of the chest wall characterized by a depression of the sternum, giving the chest ("pectus") a caved-in ("excavatum") appearance.
Macrocephaly
MedGen UID:
745757
Concept ID:
C2243051
Finding
Occipitofrontal (head) circumference greater than 97th centile compared to appropriate, age matched, sex-matched normal standards. Alternatively, a apparently increased size of the cranium.
Facial asymmetry
MedGen UID:
266298
Concept ID:
C1306710
Finding
An abnormal difference between the left and right sides of the face.
Coarse facial features
MedGen UID:
335284
Concept ID:
C1845847
Finding
Absence of fine and sharp appearance of brows, nose, lips, mouth, and chin, usually because of rounded and heavy features or thickened skin with or without thickening of subcutaneous and bony tissues.
Broad neck
MedGen UID:
344099
Concept ID:
C1853638
Finding
Increased side-to-side width of the neck.
Cafe-au-lait spot
MedGen UID:
113157
Concept ID:
C0221263
Finding
Cafe-au-lait spots are hyperpigmented lesions that can vary in color from light brown to dark brown with smooth borders and having a size of 1.5 cm or more in adults and 0.5 cm or more in children.
Inguinal freckling
MedGen UID:
320315
Concept ID:
C1834297
Finding
The presence in the inguinal region (groin) of an increased number of freckles, small circular spots on the skin that are darker than the surrounding skin because of deposits of melanin.
Axillary freckling
MedGen UID:
348082
Concept ID:
C1860335
Finding
The presence in the axillary region (armpit) of an increased number of freckles, small circular spots on the skin that are darker than the surrounding skin because of deposits of melanin.
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 (see 300000), Greig cephalopolysyndactyly (175700), and Noonan syndrome (163950) (summary by Cohen et al., 1995).
Strabismus
MedGen UID:
21337
Concept ID:
C0038379
Disease or Syndrome
A misalignment of the eyes so that the visual axes deviate from bifoveal fixation. The classification of strabismus may be based on a number of features including the relative position of the eyes, whether the deviation is latent or manifest, intermittent or constant, concomitant or otherwise and according to the age of onset and the relevance of any associated refractive error.
Lisch nodules
MedGen UID:
395461
Concept ID:
C1860334
Finding
The presence of pigmented, oval and dome-shaped raised hamartomatous nevi of the iris..

Term Hierarchy

CClinical test,  RResearch test,  OOMIM,  GGeneReviews,  VClinVar  
  • CROGVChromosome 17q11.2 deletion syndrome, 1.4Mb

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