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Congenital disorder of glycosylation, type IIq(CDG2Q; CDGIIq)

MedGen UID:
1390458
Concept ID:
C4479353
Disease or Syndrome
Synonym: CDG IIq
SNOMED CT: COG2-related congenital disorder of glycosylation (1197753005); COG2-CDG - component of oligomeric golgi complex 2 - congenital disorder of glycosylation (1197753005); Component of oligomeric golgi complex 2-related congenital disorder of glycosylation (1197753005)
Modes of inheritance:
Autosomal recessive inheritance
MedGen UID:
141025
Concept ID:
C0441748
Intellectual Product
Source: 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 individuals with two pathogenic alleles, either homozygotes (two copies of the same mutant allele) or compound heterozygotes (whereby each copy of a gene has a distinct mutant allele).
 
Gene (location): COG2 (1q42.2)
 
Monarch Initiative: MONDO:0054559
OMIM®: 617395
Orphanet: ORPHA435934

Definition

A rare congenital disorder of glycosylation caused by mutations in the COG2 gene and with characteristics of normal presentation at birth, followed by progressive deterioration with postnatal microcephaly, developmental delay, intellectual disability, seizures, spastic quadriplegia, liver dysfunction, hypocupremia and hypoceruloplasminemia in the first year of life. Diffuse cerebral atrophy and thin corpus callosum may be observed on brain MRI. [from SNOMEDCT_US]

Clinical features

From HPO
Hypoplasia of the corpus callosum
MedGen UID:
138005
Concept ID:
C0344482
Congenital Abnormality
Underdevelopment of the corpus callosum.
Spastic tetraplegia
MedGen UID:
98433
Concept ID:
C0426970
Disease or Syndrome
Spastic paralysis affecting all four limbs.
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.
Diffuse cerebral atrophy
MedGen UID:
108958
Concept ID:
C0598275
Finding
Diffuse unlocalised atrophy affecting the cerebrum.
Generalized tonic seizure
MedGen UID:
322935
Concept ID:
C1836508
Disease or Syndrome
A generalized tonic seizure is a type of generalized motor seizure characterized by bilateral limb stiffening or elevation, often with neck stiffening without a subsequent clonic phase. The tonic activity can be a sustained abnormal posture, either in extension or flexion, sometimes accompanied by tremor of the extremities.
Small pituitary gland
MedGen UID:
868479
Concept ID:
C4022873
Anatomical Abnormality
An abnormally decreased size of the pituitary gland.
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.
Secondary microcephaly
MedGen UID:
608952
Concept ID:
C0431352
Finding
Head circumference which falls below 2 standard deviations below the mean for age and gender because of insufficient head growth after birth.
Elevated circulating hepatic transaminase concentration
MedGen UID:
116013
Concept ID:
C0235996
Finding
Elevations of the levels of SGOT and SGPT in the serum. SGOT (serum glutamic oxaloacetic transaminase) and SGPT (serum glutamic pyruvic transaminase) are transaminases primarily found in the liver and heart and are released into the bloodstream as the result of liver or heart damage. SGOT and SGPT are used clinically mainly as markers of liver damage.
Decreased circulating ceruloplasmin concentration
MedGen UID:
472980
Concept ID:
C0240997
Finding
Decreased concentration of ceruloplasmin in the blood.
Decreased circulating copper concentration
MedGen UID:
488831
Concept ID:
C0268070
Disease or Syndrome
A reduced concentration of copper in the blood.
Abnormal glycosylation
MedGen UID:
868547
Concept ID:
C4022946
Finding
An anomaly of a glycosylation process, i.e., a process involved in the covalent attachment of a glycosyl residue to a substrate molecule.

Term Hierarchy

CClinical test,  RResearch test,  OOMIM,  GGeneReviews,  VClinVar  
  • CROGVCongenital disorder of glycosylation, type IIq

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