Rothmund–Thomson syndrome

Rothmund-Thomson syndrome
Panel showing some clinical features of the RTS syndrome. A) Chronic phase of cheek poikiloderma (4-year-old girl). B) Poikiloderma with alopecia (21-year-old boy). C) Poikiloderma. D) Poikiloderma sparing the trunk (courtesy of Professor M. Paradisi, Rome). E) Photo distributed poikiloderma and valgism of the knees. F) Thumb aplasia (patient B). G) Bone defect seen by X-Rays: cystic-like destructive lesion of the humerus (distal epiphysis) without apparent solution of continuity of the cortical bone (patient E).
Classification and external resources
Specialty medical genetics
ICD-10 Q82.8 (ILDS Q82.852)
ICD-9-CM 757.33
OMIM 268400
DiseasesDB 29891
eMedicine derm/379
MeSH D011038
GeneReviews
Orphanet 2909

Rothmund–Thomson syndrome (RTS), also known as poikiloderma atrophicans with cataract or poikiloderma congenitale,[1][2] is a rare autosomal recessive[3][4] skin condition originally described by August von Rothmund (1830–1906) in 1868.[5] Matthew Sydney Thomson (1894–1969) published further descriptions in 1936.[6]

There have been several reported cases associated with osteosarcoma. A hereditary genetic basis, mutations in the DNA Helicase RECQL4 gene, causing problems during initiation of DNA replication has been implicated in the syndrome [1][7][8][9]

Characteristics

The skin is normal at birth. Between 3 and 6 months of age, the affected carrier develops poikiloderma on the cheeks. This characteristic “rash” that all RTS carriers have can develop on the arms, legs and buttocks. “Poikiloderma consists of areas of increased and decreased pigmentation, prominent blood vessels, and thinning of the skin”[11]

Accelerated aging

In humans, individuals with RTS, and carrying the RECQL4 germline mutation, can have several clinical features of accelerated aging. These features include atrophic skin and pigment changes, alopecia, osteopenia, cataracts and an increased incidence of cancer.[12] Also in mice, RECQL4 mutants show features of accelerated aging.[13]

Causes

Rothmund–Thomson syndrome has an autosomal recessive pattern of inheritance.

RTS is caused by a mutation of the RECQL4 gene, located at chromosome 8q24.3.[7][14] The disorder is inherited in an autosomal recessive manner.[3] This means the defective gene responsible for the disorder is located on an autosome (chromosome 8 is an autosome), and two copies of the defective gene (one inherited from each parent) are required in order to be born with the disorder. The parents of an individual with an autosomal recessive disorder both carry one copy of the defective gene, but usually do not experience any signs or symptoms of the disorder.

DNA repair

RECQL4 has a crucial role in DNA end resection that is the initial step required for homologous recombination (HR)-dependent double-strand break repair.[15] When RECQL4 is depleted, HR-mediated repair and 5’ end resection are severely reduced in vivo. RECQL4 also appears to be necessary for other forms of DNA repair including non-homologous end joining, nucleotide excision repair and base excision repair.[12] The association of deficient RECQL4-mediated DNA repair with accelerated aging is consistent with the DNA damage theory of aging.

See also

References

  1. 1 2 Online Mendelian Inheritance in Man (OMIM) 268400
  2. ↑ James, William; Berger, Timothy; Elston, Dirk (2005). Andrews' Diseases of the Skin: Clinical Dermatology (10th ed.). Saunders. p. 576. ISBN 0-7216-2921-0.
  3. 1 2 Larizza, L.; Roversi, G.; Volpi, L. (Jan 2010). "Rothmund-Thomson syndrome". Orphanet Journal of Rare Diseases (Free full text). 5: 2. PMC 2826297 Freely accessible. PMID 20113479. doi:10.1186/1750-1172-5-2.
  4. ↑ Raza N, Malik QU, Hussain Z (2007). "Rothmund-Thomson syndrome: more than just a cosmetic concern". J Coll Physicians Surg Pak. 17 (7): 423–424. PMID 17686357.
  5. ↑ Lu, Linchao; Jin, Weidong; Wang, Lisa L. (2016). "Aging in Rothmund-Thomson syndrome and related RECQL4 genetic disorders". Ageing Research Reviews. 33: 30–35. ISSN 1568-1637. PMID 27287744. doi:10.1016/j.arr.2016.06.002.
  6. ↑ Thomson, MS. (Mar 1936). "Poikiloderma Congenitale: Two Cases for Diagnosis.". Proc R Soc Med. 29 (5): 453–5. PMC 2076117 Freely accessible. PMID 19990626.
  7. 1 2 Larizza L, Magnani I, Roversi G (January 2006). "Rothmund–Thomson syndrome and RECQL4 defect: Splitting and lumping". Cancer Letters. 232 (1): 107–120. PMID 16271439. doi:10.1016/j.canlet.2005.07.042.
  8. ↑ Hicks MJ, Roth JR, Kozinetz CA, Wang LL (2007). "Clinicopathologic features of osteosarcoma in patients with Rothmund-Thomson syndrome". J. Clin. Oncol. 25 (4): 370–5. PMID 17264332. doi:10.1200/JCO.2006.08.4558.
  9. ↑ Sangrithi MN, Bernal JA, Madine M, Philpott A, Lee J, Dunphy WG, Venkitaraman AR (Jun 2005). "Initiation of DNA replication requires the RECQL4 protein mutated in Rothmund-Thomson syndrome". Cell. 121 (6): 887–98. PMID 15960976. doi:10.1016/j.cell.2005.05.015.
  10. ↑ Wang LL, Levy ML, Lewis RA, et al. (2001). "Clinical manifestations in a cohort of 41 Rothmund-Thomson syndrome patients". Am. J. Med. Genet. 102 (1): 11–17. PMID 11471165. doi:10.1002/1096-8628(20010722)102:1<11::AID-AJMG1413>3.0.CO;2-A.
  11. ↑ Understanding RTS pamphlet, RTS Team: Lisa L. Wang (Oncologist), Moise L. Levy (dermatologist), Richard A. Lewis (Ophtalmologist), Sharon E. Plon (Geneticist)
  12. 1 2 Lu L, Jin W, Wang LL (2017). "Aging in Rothmund-Thomson syndrome and related RECQL4 genetic disorders". Ageing Res. Rev. 33: 30–35. PMID 27287744. doi:10.1016/j.arr.2016.06.002.
  13. ↑ Lu H, Fang EF, Sykora P, Kulikowicz T, Zhang Y, Becker KG, Croteau DL, Bohr VA (2014). "Senescence induced by RECQL4 dysfunction contributes to Rothmund-Thomson syndrome features in mice". Cell Death Dis. 5: e1226. PMC 4047874 Freely accessible. PMID 24832598. doi:10.1038/cddis.2014.168.
  14. ↑ Online Mendelian Inheritance in Man (OMIM) 603780
  15. ↑ Lu H, Shamanna RA, Keijzers G, Anand R, Rasmussen LJ, Cejka P, Croteau DL, Bohr VA (2016). "RECQL4 Promotes DNA End Resection in Repair of DNA Double-Strand Breaks". Cell Rep. 16 (1): 161–73. PMID 27320928. doi:10.1016/j.celrep.2016.05.079.
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