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Spondylometaphyseal dysplasia-cone-rod dystrophy syndrome(SMDCRD)

MedGen UID:
324684
Concept ID:
C1837073
Disease or Syndrome
Synonym: Spondylometaphyseal dysplasia with cone-rod dystrophy
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): PCYT1A (3q29)
 
Monarch Initiative: MONDO:0012160
OMIM®: 608940
Orphanet: ORPHA85167

Definition

Spondylometaphyseal dysplasia with cone-rod dystrophy (SMDCRD) is characterized by postnatal growth deficiency resulting in profound short stature, rhizomelia with bowing of the lower extremities, platyspondyly with anterior vertebral protrusions, progressive metaphyseal irregularity and cupping with shortened tubular bones, and early-onset progressive visual impairment associated with a pigmentary maculopathy and electroretinographic evidence of cone-rod dysfunction (summary by Hoover-Fong et al., 2014). Yamamoto et al. (2014) reviewed 16 reported cases of SMDCRD, noting that all affected individuals presented uniform skeletal findings, with rhizomelia and bowed lower limbs observed in the first year of life, whereas retinal dystrophy had a more variable age of onset. There was severe disproportionate short stature, with a final height of less than 100 cm; scoliosis was usually mild. Visual loss was progressive, with stabilization in adolescence. [from OMIM]

Clinical features

From HPO
Brachydactyly
MedGen UID:
67454
Concept ID:
C0221357
Congenital Abnormality
Digits that appear disproportionately short compared to the hand/foot. The word brachydactyly is used here to describe a series distinct patterns of shortened digits (brachydactyly types A-E). This is the sense used here.
Tibial bowing
MedGen UID:
332360
Concept ID:
C1837081
Finding
A bending or abnormal curvature of the tibia.
Short metacarpal
MedGen UID:
323064
Concept ID:
C1837084
Anatomical Abnormality
Diminished length of one or more metacarpal bones in relation to the others of the same hand or to the contralateral metacarpal.
Short finger
MedGen UID:
334977
Concept ID:
C1844548
Anatomical Abnormality
Abnormally short finger associated with developmental hypoplasia.
Rhizomelia
MedGen UID:
357122
Concept ID:
C1866730
Congenital Abnormality
Disproportionate shortening of the proximal segment of limbs (i.e. the femur and humerus).
Coxa vara
MedGen UID:
1790477
Concept ID:
C5551440
Anatomical Abnormality
Coxa vara includes all forms of decrease of the femoral neck shaft angle (the angle between the neck and the shaft of the femur) to less than 120 degrees.
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).
Postnatal growth retardation
MedGen UID:
395343
Concept ID:
C1859778
Finding
Slow or limited growth after birth.
Increased hepatic echogenicity
MedGen UID:
1382460
Concept ID:
C4477000
Finding
Increased echogenicity of liver tissue on sonography, manifested as an increased amount of white on the screen of the sonography device.
Scoliosis
MedGen UID:
11348
Concept ID:
C0036439
Disease or Syndrome
The presence of an abnormal lateral curvature of the spine.
Joint stiffness
MedGen UID:
56403
Concept ID:
C0162298
Sign or Symptom
Joint stiffness is a perceived sensation of tightness in a joint or joints when attempting to move them after a period of inactivity. Joint stiffness typically subsides over time.
Narrow greater sciatic notch
MedGen UID:
154353
Concept ID:
C0566888
Finding
A narrowing of the sacrosciatic notch, i.e., the deep indentation in the posterior border of the hip bone at the point of union of the ilium and ischium.
Hypoplastic inferior ilia
MedGen UID:
324686
Concept ID:
C1837078
Finding
Metaphyseal cupping
MedGen UID:
323062
Concept ID:
C1837082
Finding
Metaphyseal cupping refers to an inward bulging of the metaphyseal profile giving the metaphysis a cup-like appearance.
Metaphyseal irregularity
MedGen UID:
325478
Concept ID:
C1838662
Finding
Irregularity of the normally smooth surface of the metaphyses.
Platyspondyly
MedGen UID:
335010
Concept ID:
C1844704
Finding
A flattened vertebral body shape with reduced distance between the vertebral endplates.
Metaphyseal widening
MedGen UID:
341364
Concept ID:
C1849039
Finding
Abnormal widening of the metaphyseal regions of long bones.
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.
Severe platyspondyly
MedGen UID:
338014
Concept ID:
C1850293
Finding
Short long bone
MedGen UID:
344385
Concept ID:
C1854912
Finding
One or more abnormally short long bone.
Ovoid vertebral bodies
MedGen UID:
344549
Concept ID:
C1855665
Finding
When viewed in lateral radiographs, vertebral bodies have a roughly rectangular configuration. This term applies if the vertebral body appears rounded or oval.
Femoral bowing
MedGen UID:
347888
Concept ID:
C1859461
Finding
Bowing (abnormal curvature) of the femur.
Cupped ribs
MedGen UID:
351284
Concept ID:
C1865039
Finding
Wide, concave rib end.
Spondylometaphyseal dysplasia
MedGen UID:
1674850
Concept ID:
C4759767
Disease or Syndrome
A heterogeneous group of disorders associated with walking and growth disturbances that become evident during the second year of life. Characteristics are platyspondyly (flattened vertebrae) and marked hip and knee metaphyseal lesions. The different forms of spondylometaphyseal dysplasia are distinguished by the localisation and severity of involvement of the affected metaphyses.
Bowing of the legs
MedGen UID:
1807399
Concept ID:
C5574706
Finding
A bending or abnormal curvature affecting a long bone of the leg.
Recurrent otitis media
MedGen UID:
155436
Concept ID:
C0747085
Disease or Syndrome
Increased susceptibility to otitis media, as manifested by recurrent episodes of otitis media.
Dental malocclusion
MedGen UID:
9869
Concept ID:
C0024636
Anatomical Abnormality
Dental malocclusion refers to an abnormality of the occlusion, or alignment, of the teeth and the way the upper and lower teeth fit together, resulting in overcrowding of teeth or in abnormal bite patterns.
Abnormal facial shape
MedGen UID:
98409
Concept ID:
C0424503
Finding
An abnormal morphology (form) of the face or its components.
Corneal opacity
MedGen UID:
40485
Concept ID:
C0010038
Finding
A reduction of corneal clarity.
Lens subluxation
MedGen UID:
9718
Concept ID:
C0023316
Disease or Syndrome
Partial dislocation of the lens of the eye.
Microphthalmia
MedGen UID:
10033
Concept ID:
C0026010
Congenital Abnormality
Microphthalmia is an eye abnormality that arises before birth. In this condition, one or both eyeballs are abnormally small. In some affected individuals, the eyeball may appear to be completely missing; however, even in these cases some remaining eye tissue is generally present. Such severe microphthalmia should be distinguished from another condition called anophthalmia, in which no eyeball forms at all. However, the terms anophthalmia and severe microphthalmia are often used interchangeably. Microphthalmia may or may not result in significant vision loss.\n\nPeople with microphthalmia may also have a condition called coloboma. Colobomas are missing pieces of tissue in structures that form the eye. They may appear as notches or gaps in the colored part of the eye called the iris; the retina, which is the specialized light-sensitive tissue that lines the back of the eye; the blood vessel layer under the retina called the choroid; or in the optic nerves, which carry information from the eyes to the brain. Colobomas may be present in one or both eyes and, depending on their size and location, can affect a person's vision.\n\nPeople with microphthalmia may also have other eye abnormalities, including clouding of the lens of the eye (cataract) and a narrowed opening of the eye (narrowed palpebral fissure). Additionally, affected individuals may have an abnormality called microcornea, in which the clear front covering of the eye (cornea) is small and abnormally curved.\n\nBetween one-third and one-half of affected individuals have microphthalmia as part of a syndrome that affects other organs and tissues in the body. These forms of the condition are described as syndromic. When microphthalmia occurs by itself, it is described as nonsyndromic or isolated.
Myopia
MedGen UID:
44558
Concept ID:
C0027092
Disease or Syndrome
Nearsightedness, also known as myopia, is an eye condition that causes blurry distance vision. People who are nearsighted have more trouble seeing things that are far away (such as when driving) than things that are close up (such as when reading or using a computer). If it is not treated with corrective lenses or surgery, nearsightedness can lead to squinting, eyestrain, headaches, and significant visual impairment.\n\nNearsightedness usually begins in childhood or adolescence. It tends to worsen with age until adulthood, when it may stop getting worse (stabilize). In some people, nearsightedness improves in later adulthood.\n\nFor normal vision, light passes through the clear cornea at the front of the eye and is focused by the lens onto the surface of the retina, which is the lining of the back of the eye that contains light-sensing cells. People who are nearsighted typically have eyeballs that are too long from front to back. As a result, light entering the eye is focused too far forward, in front of the retina instead of on its surface. It is this change that causes distant objects to appear blurry. The longer the eyeball is, the farther forward light rays will be focused and the more severely nearsighted a person will be.\n\nNearsightedness is measured by how powerful a lens must be to correct it. The standard unit of lens power is called a diopter. Negative (minus) powered lenses are used to correct nearsightedness. The more severe a person's nearsightedness, the larger the number of diopters required for correction. In an individual with nearsightedness, one eye may be more nearsighted than the other.\n\nEye doctors often refer to nearsightedness less than -5 or -6 diopters as "common myopia." Nearsightedness of -6 diopters or more is commonly called "high myopia." This distinction is important because high myopia increases a person's risk of developing other eye problems that can lead to permanent vision loss or blindness. These problems include tearing and detachment of the retina, clouding of the lens (cataract), and an eye disease called glaucoma that is usually related to increased pressure within the eye. The risk of these other eye problems increases with the severity of the nearsightedness. The term "pathological myopia" is used to describe cases in which high myopia leads to tissue damage within the eye.
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.
Coloboma of optic nerve
MedGen UID:
57832
Concept ID:
C0155299
Disease or Syndrome
A cleft of the optic nerve that extends inferiorly.
Reduced visual acuity
MedGen UID:
65889
Concept ID:
C0234632
Finding
Diminished clarity of vision.
Macular atrophy
MedGen UID:
140841
Concept ID:
C0423421
Finding
Well-demarcated area(s) of partial or complete depigmentation in the macula, reflecting atrophy of the retinal pigment epithelium with associated retinal photoreceptor loss.
Retinal atrophy
MedGen UID:
101075
Concept ID:
C0521694
Disease or Syndrome
Well-demarcated area(s) of partial or complete depigmentation in the fundus, reflecting atrophy of the retinal pigment epithelium with associated retinal photoreceptor loss.
Congenital ectopic pupil
MedGen UID:
224790
Concept ID:
C1271219
Congenital Abnormality
Ectopia pupillae is a congenital eye malformation in which the pupils are displaced from their normal central position.
Progressive visual loss
MedGen UID:
326867
Concept ID:
C1839364
Finding
A reduction of previously attained ability to see.
Undetectable electroretinogram
MedGen UID:
383742
Concept ID:
C1855685
Finding
Lack of any response to stimulation upon electroretinography.
Retinal thinning
MedGen UID:
762617
Concept ID:
C3549703
Finding
Reduced anteroposterior thickness of the retina. This phenotype can be appreciated by retinal optical coherence tomography (OCT).
Abnormality of macular pigmentation
MedGen UID:
892991
Concept ID:
C4024756
Anatomical Abnormality
Abnormality of macular or foveal pigmentation.
Cone-rod dystrophy
MedGen UID:
896366
Concept ID:
C4085590
Disease or Syndrome
There are more than 30 types of cone-rod dystrophy, which are distinguished by their genetic cause and their pattern of inheritance: autosomal recessive, autosomal dominant, and X-linked. Additionally, cone-rod dystrophy can occur alone without any other signs and symptoms or it can occur as part of a syndrome that affects multiple parts of the body.\n\nThe first signs and symptoms of cone-rod dystrophy, which often occur in childhood, are usually decreased sharpness of vision (visual acuity) and increased sensitivity to light (photophobia). These features are typically followed by impaired color vision (dyschromatopsia), blind spots (scotomas) in the center of the visual field, and partial side (peripheral) vision loss. Over time, affected individuals develop night blindness and a worsening of their peripheral vision, which can limit independent mobility. Decreasing visual acuity makes reading increasingly difficult and most affected individuals are legally blind by mid-adulthood. As the condition progresses, individuals may develop involuntary eye movements (nystagmus).\n\nCone-rod dystrophy is a group of related eye disorders that causes vision loss, which becomes more severe over time. These disorders affect the retina, which is the layer of light-sensitive tissue at the back of the eye. In people with cone-rod dystrophy, vision loss occurs as the light-sensing cells of the retina gradually deteriorate.

Term Hierarchy

CClinical test,  RResearch test,  OOMIM,  GGeneReviews,  VClinVar  
  • CROGVSpondylometaphyseal dysplasia-cone-rod dystrophy syndrome
Follow this link to review classifications for Spondylometaphyseal dysplasia-cone-rod dystrophy syndrome in Orphanet.

Recent clinical studies

Etiology

Ben-Salem S, Robbins SM, Lm Sobreira N, Lyon A, Al-Shamsi AM, Islam BK, Akawi NA, John A, Thachillath P, Al Hamed S, Valle D, Ali BR, Al-Gazali L
J Med Genet 2018 Feb;55(2):122-130. Epub 2017 Nov 9 doi: 10.1136/jmedgenet-2017-104827. PMID: 29122926Free PMC Article
Wang Z, Iida A, Miyake N, Nishiguchi KM, Fujita K, Nakazawa T, Alswaid A, Albalwi MA, Kim OH, Cho TJ, Lim GY, Isidor B, David A, Rustad CF, Merckoll E, Westvik J, Stattin EL, Grigelioniene G, Kou I, Nakajima M, Ohashi H, Smithson S, Matsumoto N, Nishimura G, Ikegawa S
PLoS One 2016;11(3):e0150555. Epub 2016 Mar 14 doi: 10.1371/journal.pone.0150555. PMID: 26974433Free PMC Article
Wortmann SB, Espeel M, Almeida L, Reimer A, Bosboom D, Roels F, de Brouwer AP, Wevers RA
J Inherit Metab Dis 2015 Jan;38(1):99-110. Epub 2014 Sep 2 doi: 10.1007/s10545-014-9759-7. PMID: 25178427

Diagnosis

Wortmann SB, Espeel M, Almeida L, Reimer A, Bosboom D, Roels F, de Brouwer AP, Wevers RA
J Inherit Metab Dis 2015 Jan;38(1):99-110. Epub 2014 Sep 2 doi: 10.1007/s10545-014-9759-7. PMID: 25178427
Isidor B, Baron S, Khau van Kien P, Bertrand AM, David A, Le Merrer M
Am J Med Genet A 2010 Jun;152A(6):1550-4. doi: 10.1002/ajmg.a.33397. PMID: 20503334
Walters BA, Raff ML, Hoeve JV, Tesser R, Langer LO, France TD, Glass IA, Pauli RM
Am J Med Genet A 2004 Sep 1;129A(3):265-76. doi: 10.1002/ajmg.a.30145. PMID: 15326626

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