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Singleton-Merten syndrome 1(SGMRT1)

MedGen UID:
899946
Concept ID:
C4225427
Disease or Syndrome
Synonyms: SGMRT1; Syndrome of widened medullary cavities of the metacarpals and phalanges, aortic calcification and abnormal dentition; Widened medullary cavities of bone, aortic calcification, abnormal dentition, and muscular weakness
 
Gene (location): IFIH1 (2q24.2)
 
Monarch Initiative: MONDO:0024535
OMIM®: 182250

Definition

Singleton-Merten syndrome (SGMRT) is an uncommon autosomal dominant disorder characterized by abnormalities of blood vessels, teeth, and bone. Calcifications of the aorta and aortic and mitral valves occur in childhood or puberty and can lead to early death. Dental findings include delayed primary tooth exfoliation and permanent tooth eruption, truncated tooth root formation, early-onset periodontal disease, and severe root and alveolar bone resorption associated with dysregulated mineralization, leading to tooth loss. Osseous features consist of osteoporosis, either generalized or limited to distal extremities, distal limb osteolysis, widened medullary cavities, and easy tearing of tendons from bone. Less common features are mild facial dysmorphism (high anterior hair line, broad forehead, smooth philtrum, thin upper vermilion border), generalized muscle weakness, psoriasis, early-onset glaucoma, and recurrent infections. The disorder manifests with variable inter- and intrafamilial phenotypes (summary by Rutsch et al., 2015). Genetic Heterogeneity of Singleton-Merten Syndrome An atypical form of Singleton-Merten syndrome (SGMRT2; 616298) is caused by mutation in the DDX58 gene (609631) on chromosome 9p21. [from OMIM]

Clinical features

From HPO
Clubfoot
MedGen UID:
3130
Concept ID:
C0009081
Congenital Abnormality
Clubfoot is a congenital limb deformity defined as fixation of the foot in cavus, adductus, varus, and equinus (i.e., inclined inwards, axially rotated outwards, and pointing downwards) with concomitant soft tissue abnormalities (Cardy et al., 2007). Clubfoot may occur in isolation or as part of a syndrome (e.g., diastrophic dysplasia, 222600). Clubfoot has been reported with deficiency of long bones and mirror-image polydactyly (Gurnett et al., 2008; Klopocki et al., 2012).
Coxa valga
MedGen UID:
116080
Concept ID:
C0239137
Finding
Coxa valga is a deformity of the hip in which the angle between the femoral shaft and the femoral neck is increased compared to age-adjusted values (about 150 degrees in newborns gradually reducing to 120-130 degrees in adults).
Hip subluxation
MedGen UID:
140946
Concept ID:
C0434785
Injury or Poisoning
A partial dislocation of the hip joint, whereby the head of the femur is partially displaced from the socket.
Genu valgum
MedGen UID:
154364
Concept ID:
C0576093
Anatomical Abnormality
The legs angle inward, such that the knees are close together and the ankles far apart.
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).
Acroosteolysis
MedGen UID:
183017
Concept ID:
C0917990
Disease or Syndrome
Dissolution or degeneration of bone tissue of the phalanges of the hand.
Shallow acetabular fossae
MedGen UID:
344384
Concept ID:
C1854910
Finding
Expanded phalanges with widened medullary cavities
MedGen UID:
369464
Concept ID:
C1969287
Finding
Expanded metacarpals with widened medullary cavities
MedGen UID:
369465
Concept ID:
C1969288
Finding
Expanded metatarsals with widened medullary cavities
MedGen UID:
369975
Concept ID:
C1969289
Finding
Aortic valve stenosis
MedGen UID:
1621
Concept ID:
C0003507
Pathologic Function
The presence of a stenosis (narrowing) of the aortic valve.
Cardiomegaly
MedGen UID:
5459
Concept ID:
C0018800
Finding
Increased size of the heart, clinically defined as an increased transverse diameter of the cardiac silhouette that is greater than or equal to 50% of the transverse diameter of the chest (increased cardiothoracic ratio) on a posterior-anterior projection of a chest radiograph or a computed tomography.
Congestive heart failure
MedGen UID:
9169
Concept ID:
C0018802
Disease or Syndrome
The presence of an abnormality of cardiac function that is responsible for the failure of the heart to pump blood at a rate that is commensurate with the needs of the tissues or a state in which abnormally elevated filling pressures are required for the heart to do so. Heart failure is frequently related to a defect in myocardial contraction.
Subvalvular aortic stenosis
MedGen UID:
90950
Concept ID:
C0340375
Disease or Syndrome
A fixed form of obstruction to blood flow across the left-ventricular outflow tract related to stenosis (narrowing) below the level of the aortic valve.
Aortic valve calcification
MedGen UID:
140899
Concept ID:
C0428791
Disease or Syndrome
Deposition of calcium salts in the aortic valve.
Mitral valve calcification
MedGen UID:
181575
Concept ID:
C0919718
Disease or Syndrome
Abnormal calcification of the mitral valve.
Aortic arch calcification
MedGen UID:
409798
Concept ID:
C1969291
Pathologic Function
Calcification, that is, pathological deposition of calcium salts in the arch of aorta.
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).
Decreased body weight
MedGen UID:
1806755
Concept ID:
C5574742
Finding
Abnormally low body weight.
Waddling gait
MedGen UID:
66667
Concept ID:
C0231712
Finding
Weakness of the hip girdle and upper thigh muscles, for instance in myopathies, leads to an instability of the pelvis on standing and walking. If the muscles extending the hip joint are affected, the posture in that joint becomes flexed and lumbar lordosis increases. The patients usually have difficulties standing up from a sitting position. Due to weakness in the gluteus medius muscle, the hip on the side of the swinging leg drops with each step (referred to as Trendelenburg sign). The gait appears waddling. The patients frequently attempt to counteract the dropping of the hip on the swinging side by bending the trunk towards the side which is in the stance phase (in the German language literature this is referred to as Duchenne sign). Similar gait patterns can be caused by orthopedic conditions when the origin and the insertion site of the gluteus medius muscle are closer to each other than normal, for instance due to a posttraumatic elevation of the trochanter or pseudarthrosis of the femoral neck.
Hip dislocation
MedGen UID:
42455
Concept ID:
C0019554
Injury or Poisoning
Displacement of the femur from its normal location in the hip joint.
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.
Osteopenia
MedGen UID:
18222
Concept ID:
C0029453
Disease or Syndrome
Osteopenia is a term to define bone density that is not normal but also not as low as osteoporosis. By definition from the World Health Organization osteopenia is defined by bone densitometry as a T score -1 to -2.5.
Osteoporosis
MedGen UID:
14535
Concept ID:
C0029456
Disease or Syndrome
Osteoporosis is a systemic skeletal disease characterized by low bone density and microarchitectural deterioration of bone tissue with a consequent increase in bone fragility. According to the WHO criteria, osteoporosis is defined as a BMD that lies 2.5 standard deviations or more below the average value for young healthy adults (a T-score below -2.5 SD).
Scoliosis
MedGen UID:
11348
Concept ID:
C0036439
Disease or Syndrome
The presence of an abnormal lateral curvature of the spine.
Muscle weakness
MedGen UID:
57735
Concept ID:
C0151786
Finding
Reduced strength of muscles.
Tendon rupture
MedGen UID:
508840
Concept ID:
C0151937
Injury or Poisoning
Breakage (tear) of a tendon.
Hypoplasia of the maxilla
MedGen UID:
66804
Concept ID:
C0240310
Congenital Abnormality
Abnormally small dimension of the Maxilla. Usually creating a malocclusion or malalignment between the upper and lower teeth or resulting in a deficient amount of projection of the base of the nose and lower midface region.
Joint subluxation
MedGen UID:
83065
Concept ID:
C0332768
Injury or Poisoning
A partial dislocation of a joint.
Muscle fiber atrophy
MedGen UID:
451037
Concept ID:
C0333751
Cell or Molecular Dysfunction
Generalized hypotonia
MedGen UID:
346841
Concept ID:
C1858120
Finding
Generalized muscular hypotonia (abnormally low muscle tone).
Thickened calvaria
MedGen UID:
346823
Concept ID:
C1858452
Finding
The presence of an abnormally thick calvaria.
Hypoplastic distal radial epiphyses
MedGen UID:
409797
Concept ID:
C1969286
Finding
Underdevelopment of the distal epiphysis of the radius.
Pleural effusion
MedGen UID:
10805
Concept ID:
C0032227
Disease or Syndrome
The presence of an excessive amount of fluid in the pleural cavity.
Recurrent respiratory infections
MedGen UID:
812812
Concept ID:
C3806482
Finding
An increased susceptibility to respiratory infections as manifested by a history of recurrent respiratory infections.
Carious teeth
MedGen UID:
8288
Concept ID:
C0011334
Disease or Syndrome
Caries is a multifactorial bacterial infection affecting the structure of the tooth. This term has been used to describe the presence of more than expected dental caries.
Eruption failure
MedGen UID:
11856
Concept ID:
C0040458
Finding
A tooth which does not erupt within the teeth eruption timeline and after the loss of eruption potential.
Smooth philtrum
MedGen UID:
222980
Concept ID:
C1142533
Finding
Flat skin surface, with no ridge formation in the central region of the upper lip between the nasal base and upper vermilion border.
Broad forehead
MedGen UID:
338610
Concept ID:
C1849089
Finding
Width of the forehead or distance between the frontotemporales is more than two standard deviations above the mean (objective); or apparently increased distance between the two sides of the forehead.
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).
Short dental root
MedGen UID:
437181
Concept ID:
C2678330
Finding
Tooth root length more than 2 SD below mean, or subjectively apparently decreased tooth root length.
High anterior hairline
MedGen UID:
477667
Concept ID:
C3276036
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 above the mean. Alternatively, an apparently increased distance between the hairline and the glabella.
Hypoplasia of the tooth germ
MedGen UID:
892443
Concept ID:
C4025055
Finding
Developmental hypoplasia of the tooth germ, i.e., of the structure that forms in odontogenesis that will develop into a tooth.
Onycholysis
MedGen UID:
39324
Concept ID:
C0085661
Disease or Syndrome
Detachment of the nail from the nail bed.
Cutaneous photosensitivity
MedGen UID:
87601
Concept ID:
C0349506
Pathologic Function
An increased sensitivity of the skin to light. Photosensitivity may result in a rash upon exposure to the sun (which is known as photodermatosis). Photosensitivity can be diagnosed by phototests in which light is shone on small areas of skin.
Ptosis
MedGen UID:
2287
Concept ID:
C0005745
Disease or Syndrome
The upper eyelid margin is positioned 3 mm or more lower than usual and covers the superior portion of the iris (objective); or, the upper lid margin obscures at least part of the pupil (subjective).
Glaucoma
MedGen UID:
42224
Concept ID:
C0017601
Disease or Syndrome
Glaucoma refers loss of retinal ganglion cells in a characteristic pattern of optic neuropathy usually associated with increased intraocular pressure.
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.

Professional guidelines

PubMed

Nitschke Y, Rutsch F
Curr Osteoporos Rep 2017 Aug;15(4):255-270. doi: 10.1007/s11914-017-0370-3. PMID: 28585220

Recent clinical studies

Etiology

Rutsch F, Buers I, Nitschke Y
Arterioscler Thromb Vasc Biol 2021 Jan;41(1):35-47. Epub 2020 Nov 12 doi: 10.1161/ATVBAHA.120.315577. PMID: 33176451
Yu ZX, Song HM
World J Pediatr 2020 Feb;16(1):44-51. Epub 2019 Aug 3 doi: 10.1007/s12519-019-00273-z. PMID: 31377974
Fragoulis GE, McInnes IB, Siebert S
Rheumatology (Oxford) 2019 Feb 1;58(Suppl 1):i43-i54. doi: 10.1093/rheumatology/key276. PMID: 30806709Free PMC Article
Nitschke Y, Rutsch F
Curr Osteoporos Rep 2017 Aug;15(4):255-270. doi: 10.1007/s11914-017-0370-3. PMID: 28585220
Volpi S, Picco P, Caorsi R, Candotti F, Gattorno M
Pediatr Rheumatol Online J 2016 Jun 4;14(1):35. doi: 10.1186/s12969-016-0094-4. PMID: 27260006Free PMC Article

Diagnosis

Broser P, von Mengershausen U, Heldt K, Bartholdi D, Braun D, Wolf C, Lee-Kirsch MA
Pediatr Rheumatol Online J 2022 Apr 11;20(1):24. doi: 10.1186/s12969-022-00686-7. PMID: 35410415Free PMC Article
Rutsch F, Buers I, Nitschke Y
Arterioscler Thromb Vasc Biol 2021 Jan;41(1):35-47. Epub 2020 Nov 12 doi: 10.1161/ATVBAHA.120.315577. PMID: 33176451
Rice GI, Park S, Gavazzi F, Adang LA, Ayuk LA, Van Eyck L, Seabra L, Barrea C, Battini R, Belot A, Berg S, Billette de Villemeur T, Bley AE, Blumkin L, Boespflug-Tanguy O, Briggs TA, Brimble E, Dale RC, Darin N, Debray FG, De Giorgis V, Denecke J, Doummar D, Drake Af Hagelsrum G, Eleftheriou D, Estienne M, Fazzi E, Feillet F, Galli J, Hartog N, Harvengt J, Heron B, Heron D, Kelly DA, Lev D, Levrat V, Livingston JH, Marti I, Mignot C, Mochel F, Nougues MC, Oppermann I, Pérez-Dueñas B, Popp B, Rodero MP, Rodriguez D, Saletti V, Sharpe C, Tonduti D, Vadlamani G, Van Haren K, Tomas Vila M, Vogt J, Wassmer E, Wiedemann A, Wilson CJ, Zerem A, Zweier C, Zuberi SM, Orcesi S, Vanderver AL, Hur S, Crow YJ
Hum Mutat 2020 Apr;41(4):837-849. Epub 2020 Jan 14 doi: 10.1002/humu.23975. PMID: 31898846Free PMC Article
Yu ZX, Song HM
World J Pediatr 2020 Feb;16(1):44-51. Epub 2019 Aug 3 doi: 10.1007/s12519-019-00273-z. PMID: 31377974
Volpi S, Picco P, Caorsi R, Candotti F, Gattorno M
Pediatr Rheumatol Online J 2016 Jun 4;14(1):35. doi: 10.1186/s12969-016-0094-4. PMID: 27260006Free PMC Article

Therapy

Yu ZX, Song HM
World J Pediatr 2020 Feb;16(1):44-51. Epub 2019 Aug 3 doi: 10.1007/s12519-019-00273-z. PMID: 31377974
Fragoulis GE, McInnes IB, Siebert S
Rheumatology (Oxford) 2019 Feb 1;58(Suppl 1):i43-i54. doi: 10.1093/rheumatology/key276. PMID: 30806709Free PMC Article

Prognosis

Broser P, von Mengershausen U, Heldt K, Bartholdi D, Braun D, Wolf C, Lee-Kirsch MA
Pediatr Rheumatol Online J 2022 Apr 11;20(1):24. doi: 10.1186/s12969-022-00686-7. PMID: 35410415Free PMC Article
Rice GI, Park S, Gavazzi F, Adang LA, Ayuk LA, Van Eyck L, Seabra L, Barrea C, Battini R, Belot A, Berg S, Billette de Villemeur T, Bley AE, Blumkin L, Boespflug-Tanguy O, Briggs TA, Brimble E, Dale RC, Darin N, Debray FG, De Giorgis V, Denecke J, Doummar D, Drake Af Hagelsrum G, Eleftheriou D, Estienne M, Fazzi E, Feillet F, Galli J, Hartog N, Harvengt J, Heron B, Heron D, Kelly DA, Lev D, Levrat V, Livingston JH, Marti I, Mignot C, Mochel F, Nougues MC, Oppermann I, Pérez-Dueñas B, Popp B, Rodero MP, Rodriguez D, Saletti V, Sharpe C, Tonduti D, Vadlamani G, Van Haren K, Tomas Vila M, Vogt J, Wassmer E, Wiedemann A, Wilson CJ, Zerem A, Zweier C, Zuberi SM, Orcesi S, Vanderver AL, Hur S, Crow YJ
Hum Mutat 2020 Apr;41(4):837-849. Epub 2020 Jan 14 doi: 10.1002/humu.23975. PMID: 31898846Free PMC Article
Ferreira CR, Crow YJ, Gahl WA, Gardner PJ, Goldbach-Mansky R, Hur S, de Jesús AA, Nehrebecky M, Park JW, Briggs TA
J Clin Immunol 2019 Jan;39(1):75-80. Epub 2018 Dec 20 doi: 10.1007/s10875-018-0572-1. PMID: 30574673Free PMC Article

Clinical prediction guides

Emralino FL, Satoh S, Sakai N, Takami M, Takeuchi F, Yan N, Rutsch F, Fujita T, Kato H
J Immunol 2022 Dec 1;209(11):2093-2103. doi: 10.4049/jimmunol.2200367. PMID: 36426976
Rice GI, Park S, Gavazzi F, Adang LA, Ayuk LA, Van Eyck L, Seabra L, Barrea C, Battini R, Belot A, Berg S, Billette de Villemeur T, Bley AE, Blumkin L, Boespflug-Tanguy O, Briggs TA, Brimble E, Dale RC, Darin N, Debray FG, De Giorgis V, Denecke J, Doummar D, Drake Af Hagelsrum G, Eleftheriou D, Estienne M, Fazzi E, Feillet F, Galli J, Hartog N, Harvengt J, Heron B, Heron D, Kelly DA, Lev D, Levrat V, Livingston JH, Marti I, Mignot C, Mochel F, Nougues MC, Oppermann I, Pérez-Dueñas B, Popp B, Rodero MP, Rodriguez D, Saletti V, Sharpe C, Tonduti D, Vadlamani G, Van Haren K, Tomas Vila M, Vogt J, Wassmer E, Wiedemann A, Wilson CJ, Zerem A, Zweier C, Zuberi SM, Orcesi S, Vanderver AL, Hur S, Crow YJ
Hum Mutat 2020 Apr;41(4):837-849. Epub 2020 Jan 14 doi: 10.1002/humu.23975. PMID: 31898846Free PMC Article
Volpi S, Picco P, Caorsi R, Candotti F, Gattorno M
Pediatr Rheumatol Online J 2016 Jun 4;14(1):35. doi: 10.1186/s12969-016-0094-4. PMID: 27260006Free PMC Article

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