U.S. flag

An official website of the United States government

Format

Send to:

Choose Destination

Spondyloepimetaphyseal dysplasia, Genevieve type(SEMDG)

MedGen UID:
355314
Concept ID:
C1864872
Disease or Syndrome
Synonyms: NANS DEFICIENCY; SEMD Genevieve type
SNOMED CT: Spondyloepimetaphyseal dysplasia Geneviève type (773303005); Spondyloepimetaphyseal dysplasia Genevieve type (773303005); SEMDG - spondyloepimetaphyseal dysplasia Genevieve type (773303005)
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): NANS (9q22.33)
 
Monarch Initiative: MONDO:0012495
OMIM®: 610442
Orphanet: ORPHA168454

Definition

Spondyloepiphyseal dysplasia of the Genevieve type (SEMDG) is characterized by infantile-onset severe developmental delay and skeletal dysplasia, including short stature, premature carpal ossification, platyspondyly, longitudinal metaphyseal striations, and small epiphyses (summary by van Karnebeek et al., 2016). [from OMIM]

Clinical features

From HPO
Flat acetabular roof
MedGen UID:
373340
Concept ID:
C1837485
Finding
Flattening of the superior part of the acetabulum, which is a cup-shaped cavity at the base of the hipbone into which the ball-shaped head of the femur fits. The acetabular roof thereby appears horizontal rather than arched, as it normally does.
Long fibula
MedGen UID:
338386
Concept ID:
C1848109
Finding
Disproportionately long fibulae.
Advanced ossification of carpal bones
MedGen UID:
341422
Concept ID:
C1849292
Finding
Ossification of carpal bones at an abnormally early age.
Carpal bone hypoplasia
MedGen UID:
355049
Concept ID:
C1863749
Finding
Underdevelopment of one or more carpal bones.
Short stature
MedGen UID:
87607
Concept ID:
C0349588
Finding
A height below that which is expected according to age and gender norms. Although there is no universally accepted definition of short stature, many refer to "short stature" as height more than 2 standard deviations below the mean for age and gender (or below the 3rd percentile for age and gender dependent norms).
Simple ear
MedGen UID:
140913
Concept ID:
C0431483
Congenital Abnormality
The pinna has fewer folds and grooves than usual.
Cerebellar ataxia
MedGen UID:
849
Concept ID:
C0007758
Disease or Syndrome
Cerebellar ataxia refers to ataxia due to dysfunction of the cerebellum. This causes a variety of elementary neurological deficits including asynergy (lack of coordination between muscles, limbs and joints), dysmetria (lack of ability to judge distances that can lead to under- or overshoot in grasping movements), and dysdiadochokinesia (inability to perform rapid movements requiring antagonizing muscle groups to be switched on and off repeatedly).
Seizure
MedGen UID:
20693
Concept ID:
C0036572
Sign or Symptom
A seizure is an intermittent abnormality of nervous system physiology characterised by a transient occurrence of signs and/or symptoms due to abnormal excessive or synchronous neuronal activity in the brain.
Intellectual disability, severe
MedGen UID:
48638
Concept ID:
C0036857
Mental or Behavioral Dysfunction
Severe mental retardation is defined as an intelligence quotient (IQ) in the range of 20-34.
Cerebral atrophy
MedGen UID:
116012
Concept ID:
C0235946
Disease or Syndrome
Atrophy (wasting, decrease in size of cells or tissue) affecting the cerebrum.
Hypoplasia of the corpus callosum
MedGen UID:
138005
Concept ID:
C0344482
Congenital Abnormality
Underdevelopment of the corpus callosum.
Motor delay
MedGen UID:
381392
Concept ID:
C1854301
Finding
A type of Developmental delay characterized by a delay in acquiring motor skills.
Ventriculomegaly
MedGen UID:
480553
Concept ID:
C3278923
Finding
An increase in size of the ventricular system of the brain.
Perisylvian polymicrogyria
MedGen UID:
481305
Concept ID:
C3279675
Finding
Polymicrogyria (an excessive number of small gyri or convolutions) that is maximal in perisylvian regions (the regions that surround the Sylvian fissures), which may be symmetric or asymmetric and may extend beyond perisylvian regions. The Sylvian fissures often extend posteriorly and superiorly.
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.
Small basal ganglia
MedGen UID:
868375
Concept ID:
C4022769
Finding
Decreased size of the basal ganglia.
Reduced cerebral white matter volume
MedGen UID:
1815057
Concept ID:
C5706151
Finding
An abnormally low volume of the white matter of the brain.
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.
Brachycephaly
MedGen UID:
113165
Concept ID:
C0221356
Congenital Abnormality
An abnormality of skull shape characterized by a decreased anterior-posterior diameter. That is, a cephalic index greater than 81%. Alternatively, an apparently shortened anteroposterior dimension (length) of the head compared to width.
Spondyloepimetaphyseal dysplasia
MedGen UID:
609408
Concept ID:
C0432211
Disease or Syndrome
An osteochondrodysplasia that results in abnormalities of bone growth in the vertebral column, epiphysis, and metaphysis.
Short femoral neck
MedGen UID:
373033
Concept ID:
C1836184
Finding
An abnormally short femoral neck (which is the process of bone, connecting the femoral head with the femoral shaft).
Narrow iliac wing
MedGen UID:
373150
Concept ID:
C1836688
Finding
Decreased width of the wing (or ala) of the ilium (which is the large expanded portion which bounds the greater pelvis laterally).
Metaphyseal irregularity
MedGen UID:
325478
Concept ID:
C1838662
Finding
Irregularity of the normally smooth surface of the metaphyses.
Irregular vertebral endplates
MedGen UID:
331233
Concept ID:
C1842153
Finding
An irregular surface of the vertebral end plates, which are normally relatively smooth.
Platyspondyly
MedGen UID:
335010
Concept ID:
C1844704
Finding
A flattened vertebral body shape with reduced distance between the vertebral endplates.
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.
Irregular epiphyses
MedGen UID:
337584
Concept ID:
C1846449
Finding
An alteration of the normally smooth contour of the epiphysis leading to an irregular appearance.
Small epiphyses
MedGen UID:
339612
Concept ID:
C1846803
Finding
Reduction in the size or volume of epiphyses.
Metaphyseal striations
MedGen UID:
376512
Concept ID:
C1849081
Finding
Longitudinal densities on radiographs located in a metaphysis (the narrow region of a long bone between the epiphysis and the diaphysis).
Flared metaphysis
MedGen UID:
337976
Concept ID:
C1850135
Finding
The presence of a splayed (i.e.,flared) metaphyseal segment of one or more long bones.
Posterior scalloping of vertebral bodies
MedGen UID:
337993
Concept ID:
C1850196
Finding
An excessive concavity of the posterior surface of one or more vertebral bodies.
Generalized hypotonia
MedGen UID:
346841
Concept ID:
C1858120
Finding
Generalized muscular hypotonia (abnormally low muscle tone).
Microcephaly
MedGen UID:
1644158
Concept ID:
C4551563
Finding
Head circumference below 2 standard deviations below the mean for age and gender.
Bulbous nose
MedGen UID:
66013
Concept ID:
C0240543
Finding
Increased volume and globular shape of the anteroinferior aspect of the nose.
Wide nose
MedGen UID:
140869
Concept ID:
C0426421
Finding
Interalar distance more than two standard deviations above the mean for age, i.e., an apparently increased width of the nasal base and alae.
Short neck
MedGen UID:
99267
Concept ID:
C0521525
Finding
Diminished length of the neck.
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).
Depressed nasal bridge
MedGen UID:
373112
Concept ID:
C1836542
Finding
Posterior positioning of the nasal root in relation to the overall facial profile for age.
Thick vermilion border
MedGen UID:
332232
Concept ID:
C1836543
Finding
Increased width of the skin of vermilion border region of upper lip.
Prominent forehead
MedGen UID:
373291
Concept ID:
C1837260
Finding
Forward prominence of the entire forehead, due to protrusion of the frontal bone.
Thick lower lip vermilion
MedGen UID:
326567
Concept ID:
C1839739
Finding
Increased thickness of the lower lip, leading to a prominent appearance of the lower lip. The height of the vermilion of the lower lip in the midline is more than 2 SD above the mean. Alternatively, an apparently increased height of the vermilion of the lower lip in the frontal view (subjective).
Low anterior hairline
MedGen UID:
331280
Concept ID:
C1842366
Finding
Distance between the hairline (trichion) and the glabella (the most prominent point on the frontal bone above the root of the nose), in the midline, more than two SD below the mean. Alternatively, an apparently decreased distance between the hairline and the glabella.
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.
Low posterior hairline
MedGen UID:
383755
Concept ID:
C1855728
Finding
Hair on the neck extends more inferiorly than usual.
Hirsutism
MedGen UID:
42461
Concept ID:
C0019572
Disease or Syndrome
Abnormally increased hair growth referring to a male pattern of body hair (androgenic hair).
Synophrys
MedGen UID:
98132
Concept ID:
C0431447
Congenital Abnormality
Meeting of the medial eyebrows in the midline.
Nystagmus
MedGen UID:
45166
Concept ID:
C0028738
Disease or Syndrome
Rhythmic, involuntary oscillations of one or both eyes related to abnormality in fixation, conjugate gaze, or vestibular mechanisms.
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.

Term Hierarchy

CClinical test,  RResearch test,  OOMIM,  GGeneReviews,  VClinVar  
  • CROGVSpondyloepimetaphyseal dysplasia, Genevieve type
Follow this link to review classifications for Spondyloepimetaphyseal dysplasia, Genevieve type in Orphanet.

Recent clinical studies

Etiology

Geneviève D, Héron D, El Ghouzzi V, Prost-Squarcioni C, Le Merrer M, Jacquette A, Sanlaville D, Pinton F, Villeneuve N, Kalifa G, Munnich A, Cormier-Daire V
Eur J Hum Genet 2005 May;13(5):541-6. doi: 10.1038/sj.ejhg.5201339. PMID: 15726110

Clinical prediction guides

Geneviève D, Héron D, El Ghouzzi V, Prost-Squarcioni C, Le Merrer M, Jacquette A, Sanlaville D, Pinton F, Villeneuve N, Kalifa G, Munnich A, Cormier-Daire V
Eur J Hum Genet 2005 May;13(5):541-6. doi: 10.1038/sj.ejhg.5201339. PMID: 15726110

Supplemental Content

Recent activity

Your browsing activity is empty.

Activity recording is turned off.

Turn recording back on

See more...