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Trichothiodystrophy
Other names	Amish brittle hair syndrome, BIDS syndrome, brittle hair–intellectual impairment–decreased fertility–short stature syndrome
This condition is inherited in an autosomal recessive manner.
Specialty	Dermatology, medical genetics

Trichothiodystrophy (TTD) is an autosomal recessive inherited disorder characterised by brittle hair and intellectual impairment. The word breaks down into tricho – "hair", thio – "sulphur", and dystrophy – "wasting away" or literally "bad nourishment". TTD is associated with a range of symptoms connected with organs of the ectoderm and neuroectoderm. TTD may be subclassified into four syndromes: Approximately half of all patients with trichothiodystrophy have photosensitivity, which divides the classification into syndromes with or without photosensitivity; BIDS and PBIDS, and IBIDS and PIBIDS. Modern covering usage is TTD-P (photosensitive), and TTD.

Presentation

Features of TTD can include photosensitivity, ichthyosis, brittle hair and nails, intellectual impairment, decreased fertility and short stature. A more subtle feature associated with this syndrome is a "tiger tail" banding pattern in hair shafts, seen in microscopy under polarized light. The acronyms PIBIDS, IBIDS, BIDS and PBIDS give the initials of the words involved. BIDS syndrome, also called Amish brittle hair brain syndrome and hair-brain syndrome, is an autosomal recessive inherited disease. It is nonphotosensitive. BIDS is characterized by brittle hair, intellectual impairment, decreased fertility, and short stature. There is a photosensitive syndrome, PBIDS.

BIDS is associated with the gene MPLKIP (TTDN1). IBIDS syndrome, following the acronym from ichthyosis, brittle hair and nails, intellectual impairment and short stature, is the Tay syndrome or sulfur-deficient brittle hair syndrome, first described by Tay in 1971. (Chong Hai Tay was the Singaporean doctor who was the first doctor in South East Asia to have a disease named after him.) Tay syndrome should not be confused with the Tay–Sachs disease. It is an autosomal recessive congenital disease. In some cases, it can be diagnosed prenatally. IBIDS syndrome is nonphotosensitive.

Cause

The photosensitive form is referred to as PIBIDS, and is associated with ERCC2/XPD and ERCC3.

Photosensitive forms

All photosensitive TTD syndromes have defects in the nucleotide excision repair (NER) pathway, which is a vital DNA repair system that removes many kinds of DNA lesions. This defect is not present in the nonphotosensitive TTD's. These type of defects can result in other rare autosomal recessive diseases like xeroderma pigmentosum and Cockayne syndrome.

DNA repair

Currently, mutations in four genes are recognized as causing the TTD phenotype, namely TTDN1, ERCC3/XPB, ERCC2/XPD and TTDA. Individuals with defects in XPB, XPD and TTDA are photosensitive, whereas those with a defect in TTDN1 are not. The three genes, XPB, XPD and TTDA, encode protein components of the multi-subunit transcription/repair factor IIH (TFIIH). This complex factor is an important decision maker in NER that opens the DNA double helix after damage is initially recognized. NER is a multi-step pathway that removes a variety of different DNA damages that alter normal base pairing, including both UV-induced damages and bulky chemical adducts. Features of premature aging often occur in individuals with mutational defects in genes specifying protein components of the NER pathway, including those with TTD (see DNA damage theory of aging).

Diagnosis

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Treatment

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See also

• Skin lesion
• List of cutaneous conditions

References

1. ^ "Trichothiodystrophy". Genetics Home Reference. Retrieved 19 February 2018.
2. Lambert WC, Gagna CE, Lambert MW (2010). "Trichothiodystrophy: Photosensitive, TTD-P, TTD, Tay Syndrome". Diseases of DNA Repair. Advances in Experimental Medicine and Biology. Vol. 685. pp. 106–10. doi:10.1007/978-1-4419-6448-9_10. ISBN 978-1-4419-6447-2. PMID 20687499.{{cite book}}: CS1 maint: multiple names: authors list (link)
3. Liang, Christine; Kraemer, Kenneth H.; Morris, Andrea; Schiffmann, Raphael; Price, Vera H.; Menefee, Emory; DiGiovanna, John J. (February 2005). "Characterization of tiger tail banding and hair shaft abnormalities in trichothiodystrophy". Journal of the American Academy of Dermatology. 52 (2): 224–232. doi:10.1016/j.jaad.2004.09.013. PMID 15692466.
4. Online Mendelian Inheritance in Man (OMIM): 234050
5. Baden, H. P.; Jackson, C. E.; Weiss, L.; Jimbow, K.; Lee, L.; Kubilus, J.; Gold, R. J. (Sep 1976). "The physicochemical properties of hair in the BIDS syndrome". American Journal of Human Genetics. 28 (5): 514–521. PMC 1685097. PMID 984047.
6. ^ Freedberg, et al. (2003). Fitzpatrick's Dermatology in General Medicine. (6th ed.). McGraw-Hill. ISBN 0-07-138076-0.
7. Hashimo S, and Egly JM. Trichothiodystrophy view from the molecular basis of DNA repair transcription factor TF11H.www.oxfordjournals.org/content/18/R2/R224
8. Nakabayashi K, Amann D, Ren Y, et al. (March 2005). "Identification of C7orf11 (TTDN1) gene mutations and genetic heterogeneity in nonphotosensitive trichothiodystrophy". Am. J. Hum. Genet. 76 (3): 510–6. doi:10.1086/428141. PMC 1196401. PMID 15645389.
9. Tay CH (1971). "Ichthyosiform erythroderma, hair shaft abnormalities, and mental and growth retardation. A new recessive disorder". Arch Dermatol. 104 (1): 4–13. doi:10.1001/archderm.104.1.4. PMID 5120162.
10. ^ Online Mendelian Inheritance in Man (OMIM): 601675
11. Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). Dermatology: 2-Volume Set. St. Louis: Mosby. ISBN 978-1-4160-2999-1.
12. Hashimoto S, and Egly JM, www.oxfordjournals.org/content/18/R2/R224
13. Stefanini M, B. E.; Botta, E.; Lanzafame, M.; Orioli, D. (January 2010). "Trichothiodystrophy: from basic mechanisms to clinical implications". DNA Repair. 9 (1): 2–10. doi:10.1016/j.dnarep.2009.10.005. PMID 19931493.
14. James, William; Berger, Timothy; Elston, Dirk (2005). Andrews' Diseases of the Skin: Clinical Dermatology (10th ed.). Saunders. p. 575. ISBN 978-0-7216-2921-6.
15. Kleijer WJ, van der Sterre ML, Garritsen VH, Raams A, Jaspers NG (Dec 2007). "Prenatal diagnosis of xeroderma pigmentosum and trichothiodystrophy in 76 pregnancies at risk". Prenat. Diagn. 27 (12): 1133–1137. doi:10.1002/pd.1849. PMID 17880036. S2CID 23534246.
16. Online Mendelian Inheritance in Man (OMIM): 616390
17. Hashimoto S, and Egly JM http://www.oxfordjournals.org/content/18/R2/R224
18. Peserico, A.; Battistella, P. A.; Bertoli, P. (1 January 1992). "MRI of a very rare hereditary ectodermal dysplasia: PIBI(D)S". Neuroradiology. 34 (4): 316–317. doi:10.1007/BF00588190. PMID 1528442. S2CID 31063628.
19. Theil AF, Hoeijmakers JH, Vermeulen W (2014). "TTDA: big impact of a small protein". Exp. Cell Res. 329 (1): 61–8. doi:10.1016/j.yexcr.2014.07.008. PMID 25016283.
20. Edifizi D, Schumacher B (2015). "Genome Instability in Development and Aging: Insights from Nucleotide Excision Repair in Humans, Mice, and Worms". Biomolecules. 5 (3): 1855–69. doi:10.3390/biom5031855. PMC 4598778. PMID 26287260.

External links

• NIH document on Tay syndrome

• Genodermatoses
• Autosomal recessive disorders
• Congenital disorders
• Rare diseases
• Syndromes
• DNA replication and repair-deficiency disorders
• Progeroid syndromes