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Rothmund-Thomson syndrome type 2(RTS2)

MedGen UID:
1684753
Concept ID:
C5203410
Disease or Syndrome
Synonym: RTS2
SNOMED CT: Rothmund Thomson syndrome type 2 (1003923009)
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): RECQL4 (8q24.3)
 
Monarch Initiative: MONDO:0016369
OMIM®: 268400
Orphanet: ORPHA221016

Disease characteristics

Excerpted from the GeneReview: Rothmund-Thomson Syndrome
Rothmund-Thomson syndrome (RTS) is characterized by a rash that progresses to poikiloderma; sparse hair, eyelashes, and/or eyebrows; small size; skeletal and dental abnormalities; juvenile cataracts; and an increased risk for cancer, especially osteosarcoma. A variety of benign and malignant hematologic abnormalities have been reported in affected individuals. The rash of RTS typically develops between ages three and six months (occasionally as late as age two years) as erythema, swelling, and blistering on the face, subsequently spreading to the buttocks and extremities. The rash evolves over months to years into the chronic pattern of reticulated hypo- and hyperpigmentation, telangiectasias, and punctate atrophy (collectively known as poikiloderma) that persist throughout life. Hyperkeratotic lesions occur in approximately one third of individuals. Skeletal abnormalities can include radial ray defects, ulnar defects, absent or hypoplastic patella, and osteopenia. [from GeneReviews]
Authors:
Lisa L Wang  |  Sharon E Plon   view full author information

Additional description

From OMIM
Rothmund-Thomson syndrome type 2 (RTS2) is an autosomal recessive disorder characterized by poikiloderma, congenital bone defects, and an increased risk of osteosarcoma in childhood and skin cancer later in life. The skeletal abnormalities may be overt (frontal bossing, saddle nose, and congenital radial ray defects) and/or subtle (visible only by radiographic analysis) (summary by Larizza et al., 2010). Genetic Heterogeneity of Rothmund-Thomson Syndrome Rothmund-Thomson syndrome type 1 (RTS1; 618625) is caused by mutation in the ANAPC1 gene (608473) on chromosome 2q13. Rothmund-Thomson syndrome type 3 (RTS3; 615789) is caused by mutation in the CRIPT gene (604594) on chromosome 2p21. Rothmund-Thomson syndrome type 4 (RTS4; 620819) is caused by mutation in the DNA2 gene (601810) on chromosome 10q21.  http://www.omim.org/entry/268400

Clinical features

From HPO
Squamous cell carcinoma
MedGen UID:
2874
Concept ID:
C0007137
Neoplastic Process
The presence of squamous cell carcinoma of the skin.
Osteosarcoma
MedGen UID:
10501
Concept ID:
C0029463
Neoplastic Process
A malignant bone tumor that usually develops during adolescence and usually affects the long bones including the tibia, femur, and humerus. The typical symptoms of osteosarcoma comprise bone pain, fracture, limitation of motion, and tenderness or swelling at the site of the tumor.
Skin basal cell carcinoma
MedGen UID:
1648304
Concept ID:
C4721806
Neoplastic Process
The presence of a basal cell carcinoma of the skin.
Cryptorchidism
MedGen UID:
8192
Concept ID:
C0010417
Congenital Abnormality
Cryptorchidism, or failure of testicular descent, is a common human congenital abnormality with a multifactorial etiology that likely reflects the involvement of endocrine, environmental, and hereditary factors. Cryptorchidism can result in infertility and increases risk for testicular tumors. Testicular descent from abdomen to scrotum occurs in 2 distinct phases: the transabdominal phase and the inguinoscrotal phase (summary by Gorlov et al., 2002).
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).
Short thumb
MedGen UID:
98469
Concept ID:
C0431890
Congenital Abnormality
Hypoplasia (congenital reduction in size) of the thumb.
Small hand
MedGen UID:
108279
Concept ID:
C0575802
Finding
Disproportionately small hand.
Short palm
MedGen UID:
334684
Concept ID:
C1843108
Finding
Short palm.
Short foot
MedGen UID:
376415
Concept ID:
C1848673
Finding
A measured foot length that is more than 2 SD below the mean for a newborn of 27 - 41 weeks gestation, or foot that is less than the 3rd centile for individuals from birth to 16 years of age (objective). Alternatively, a foot that appears disproportionately short (subjective).
Forearm reduction defects
MedGen UID:
336575
Concept ID:
C1849327
Finding
Small for gestational age
MedGen UID:
65920
Concept ID:
C0235991
Finding
Smaller than normal size according to sex and gestational age related norms, defined as a weight below the 10th percentile for the gestational age.
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).
Annular pancreas
MedGen UID:
56211
Concept ID:
C0149955
Congenital Abnormality
A congenital anomaly in which the pancreas completely (or sometimes incompletely) encircles the second portion of duodenum and occasionally obstructs the more proximal duodenum.
Anteriorly placed anus
MedGen UID:
333160
Concept ID:
C1838705
Finding
Anterior malposition of the anus.
Overfolded helix
MedGen UID:
325239
Concept ID:
C1837731
Finding
A condition in which the helix is folded over to a greater degree than normal. That is, excessive curling of the helix edge, whereby the free edge is parallel to the plane of the ear.
Prominent antihelix
MedGen UID:
335147
Concept ID:
C1845272
Finding
The presence of an abnormally prominent antihelix.
Underfolded helix
MedGen UID:
337899
Concept ID:
C1849735
Finding
Underdevelopment of the helix that either affects the entire helix, or is localized.
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.
Congenital hip dislocation
MedGen UID:
9258
Concept ID:
C0019555
Disease or Syndrome
Micrognathia
MedGen UID:
44428
Concept ID:
C0025990
Congenital Abnormality
Developmental hypoplasia of the mandible.
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).
Frontal bossing
MedGen UID:
67453
Concept ID:
C0221354
Congenital Abnormality
Bilateral bulging of the lateral frontal bone prominences with relative sparing of the midline.
Kyphoscoliosis
MedGen UID:
154361
Concept ID:
C0575158
Anatomical Abnormality
An abnormal curvature of the spine in both a coronal (lateral) and sagittal (back-to-front) plane.
Teeth, supernumerary
MedGen UID:
21210
Concept ID:
C0040457
Anatomical Abnormality
The presence of one or more teeth additional to the normal number.
Hypoplasia of teeth
MedGen UID:
852449
Concept ID:
C0235357
Congenital Abnormality
Developmental hypoplasia of teeth.
Delayed eruption of teeth
MedGen UID:
68678
Concept ID:
C0239174
Finding
Delayed tooth eruption, which can be defined as tooth eruption more than 2 SD beyond the mean eruption age.
Microdontia
MedGen UID:
66008
Concept ID:
C0240340
Congenital Abnormality
Decreased size of the teeth, which can be defined as a mesiodistal tooth diameter (width) more than 2 SD below mean. Alternatively, an apparently decreased maximum width of tooth.
High palate
MedGen UID:
66814
Concept ID:
C0240635
Congenital Abnormality
Height of the palate more than 2 SD above the mean (objective) or palatal height at the level of the first permanent molar more than twice the height of the teeth (subjective).
Mandibular prognathia
MedGen UID:
98316
Concept ID:
C0399526
Finding
Abnormal prominence of the chin related to increased length of the mandible.
Absent eyebrow
MedGen UID:
98133
Concept ID:
C0431448
Congenital Abnormality
Absence of the eyebrow.
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).
Agenesis of permanent teeth
MedGen UID:
224851
Concept ID:
C1290511
Congenital Abnormality
A congenital defect characterized by the absence of one or more permanent teeth, including oligodontia, hypodontia, and adontia of the of permanent teeth.
Sparse eyebrow
MedGen UID:
371332
Concept ID:
C1832446
Finding
Decreased density/number of eyebrow hairs.
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.
Short nose
MedGen UID:
343052
Concept ID:
C1854114
Finding
Distance from nasion to subnasale more than two standard deviations below the mean, or alternatively, an apparently decreased length from the nasal root to the nasal tip.
Sparse scalp hair
MedGen UID:
346499
Concept ID:
C1857042
Finding
Decreased number of hairs per unit area of skin of the scalp.
Narrow palpebral fissure
MedGen UID:
382506
Concept ID:
C2675021
Finding
Reduction in the vertical distance between the upper and lower eyelids.
Alopecia
MedGen UID:
7982
Concept ID:
C0002170
Finding
A noncongenital process of hair loss, which may progress to partial or complete baldness.
Telangiectasia
MedGen UID:
21088
Concept ID:
C0039446
Finding
Telangiectasias refer to small dilated blood vessels located near the surface of the skin or mucous membranes, measuring between 0.5 and 1 millimeter in diameter. Telangiectasia are located especially on the tongue, lips, palate, fingers, face, conjunctiva, trunk, nail beds, and fingertips.
Dermal atrophy
MedGen UID:
101793
Concept ID:
C0151514
Disease or Syndrome
Partial or complete wasting (atrophy) of the skin.
Nail dystrophy
MedGen UID:
66368
Concept ID:
C0221260
Disease or Syndrome
Onychodystrophy (nail dystrophy) refers to nail changes apart from changes of the color (nail dyschromia) and involves partial or complete disruption of the various keratinous layers of the nail plate.
Premature graying of hair
MedGen UID:
75524
Concept ID:
C0263498
Finding
Development of gray hair at a younger than normal age.
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.
Poikiloderma
MedGen UID:
97905
Concept ID:
C0392777
Disease or Syndrome
Poikiloderma refers to a patch of skin with (1) reticulated hypopigmentation and hyperpigmentation, (2) wrinkling secondary to epidermal atrophy, and (3) telangiectasias.
Absent eyelashes
MedGen UID:
334299
Concept ID:
C1843005
Congenital Abnormality
Lack of eyelashes.
Sparse eyelashes
MedGen UID:
375151
Concept ID:
C1843300
Finding
Decreased density/number of eyelashes.
Sparse hair
MedGen UID:
1790211
Concept ID:
C5551005
Finding
Reduced density of hairs.
Hypogonadism
MedGen UID:
5711
Concept ID:
C0020619
Disease or Syndrome
A decreased functionality of the gonad.
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.
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).
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.
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.
Cataract
MedGen UID:
39462
Concept ID:
C0086543
Disease or Syndrome
A cataract is an opacity or clouding that develops in the crystalline lens of the eye or in its capsule.
Microcornea
MedGen UID:
78610
Concept ID:
C0266544
Congenital Abnormality
A congenital abnormality of the cornea in which the cornea and the anterior segment of the eye are smaller than normal. The horizontal diameter of the cornea does not reach 10 mm even in adulthood.
Zonular cataract
MedGen UID:
350517
Concept ID:
C1861821
Disease or Syndrome
Zonular cataracts are defined to be cataracts that affect specific regions of the lens.

Term Hierarchy

CClinical test,  RResearch test,  OOMIM,  GGeneReviews,  VClinVar  
  • CROGVRothmund-Thomson syndrome type 2

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