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Genetics Home Reference: your guide to understanding genetic conditions
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Trichothiodystrophy

Reviewed May 2010

What is trichothiodystrophy?

Trichothiodystrophy, which is commonly called TTD, is a rare inherited condition that affects many parts of the body. The hallmark of this condition is brittle hair that is sparse and easily broken. Tests show that the hair is lacking sulfur, an element that normally gives hair its strength.

The signs and symptoms of trichothiodystrophy vary widely. Mild cases may involve only the hair. More severe cases also cause delayed development, significant intellectual disability, and recurrent infections; severely affected individuals may survive only into infancy or early childhood.

Mothers of children with trichothiodystrophy may experience problems during pregnancy including pregnancy-induced high blood pressure (preeclampsia) and a related condition called HELLP syndrome that can damage the liver. Babies with trichothiodystrophy are at increased risk of premature birth, low birth weight, and slow growth.

Most affected children have short stature compared to others their age. Intellectual disability and delayed development are common, although most affected individuals are highly social with an outgoing and engaging personality. Some have brain abnormalities that can be seen with imaging tests. Trichothiodystrophy is also associated with recurrent infections, particularly respiratory infections, which can be life-threatening. Other features of trichothiodystrophy can include dry, scaly skin (ichthyosis); abnormalities of the fingernails and toenails; clouding of the lens in both eyes from birth (congenital cataracts); poor coordination; and skeletal abnormalities.

About half of all people with trichothiodystrophy have a photosensitive form of the disorder, which causes them to be extremely sensitive to ultraviolet (UV) rays from sunlight. They develop a severe sunburn after spending just a few minutes in the sun. However, for reasons that are unclear, they do not develop other sun-related problems such as excessive freckling of the skin or an increased risk of skin cancer. Many people with trichothiodystrophy report that they do not sweat.

How common is trichothiodystrophy?

Trichothiodystrophy has an estimated incidence of about 1 in 1 million newborns in the United States and Europe. About 100 affected individuals have been reported worldwide.

What genes are related to trichothiodystrophy?

Most cases of the photosensitive form of trichothiodystrophy result from mutations in one of three genes: ERCC2, ERCC3, or GTF2H5. The proteins produced from these genes work together as part of a group of proteins called the general transcription factor IIH (TFIIH) complex. This complex is involved in the repair of DNA damage, which can be caused by UV radiation from the sun. The TFIIH complex also plays an important role in gene transcription, which is the first step in protein production.

Mutations in the ERCC2, ERCC3, or GTF2H5 genes reduce the amount of TFIIH complex within cells, which impairs both DNA repair and gene transcription. An inability to repair DNA damage probably underlies the sun sensitivity in affected individuals. Studies suggest that many of the other features of trichothiodystrophy may result from problems with the transcription of genes needed for normal development before and after birth.

Mutations in at least one gene, MPLKIP, have been reported to cause a non-photosensitive form of trichothiodystrophy. Mutations in this gene account for fewer than 20 percent of all cases of non-photosensitive trichothiodystrophy. Little is known about the protein produced from the MPLKIP gene, although it does not appear to be involved in DNA repair. It is unclear how mutations in the MPLKIP gene lead to the varied features of trichothiodystrophy.

In some cases, the genetic cause of trichothiodystrophy is unknown.

Related Gene(s)

Changes in these genes are associated with trichothiodystrophy.

  • ERCC2
  • ERCC3
  • GTF2H5
  • MPLKIP

How do people inherit trichothiodystrophy?

This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.

Where can I find information about diagnosis or management of trichothiodystrophy?

These resources address the diagnosis or management of trichothiodystrophy and may include treatment providers.

  • Genetic Testing Registry: BIDS brittle hair-impaired intellect-decreased fertility-short stature syndrome (http://www.ncbi.nlm.nih.gov/gtr/conditions/C0740342)
  • Genetic Testing Registry: Trichothiodystrophy, nonphotosensitive 1 (http://www.ncbi.nlm.nih.gov/gtr/conditions/C1961117)
  • Genetic Testing Registry: Trichothiodystrophy photosensitive (http://www.ncbi.nlm.nih.gov/gtr/conditions/C1866504)
  • The Merck Manual for Healthcare Professionals: Ichthyosis (http://www.merckmanuals.com/professional/dermatologic_disorders/cornification_disorders/ichthyosis.html)
  • The Merck Manual Home Edition for Patients and Caregivers: Photosensitivity Reactions (http://www.merckmanuals.com/home/skin_disorders/sunlight_and_skin_damage/photosensitivity_reactions.html)

You might also find information on the diagnosis or management of trichothiodystrophy in Educational resources (http://www.ghr.nlm.nih.gov/condition/trichothiodystrophy/show/Educational+resources) and Patient support (http://www.ghr.nlm.nih.gov/condition/trichothiodystrophy/show/Patient+support).

General information about the diagnosis (http://ghr.nlm.nih.gov/handbook/consult/diagnosis) and management (http://ghr.nlm.nih.gov/handbook/consult/treatment) of genetic conditions is available in the Handbook. Read more about genetic testing (http://ghr.nlm.nih.gov/handbook/testing), particularly the difference between clinical tests and research tests (http://ghr.nlm.nih.gov/handbook/testing/researchtesting).

To locate a healthcare provider, see How can I find a genetics professional in my area? (http://ghr.nlm.nih.gov/handbook/consult/findingprofessional) in the Handbook.

Where can I find additional information about trichothiodystrophy?

You may find the following resources about trichothiodystrophy helpful. These materials are written for the general public.

You may also be interested in these resources, which are designed for healthcare professionals and researchers.

What other names do people use for trichothiodystrophy?

  • Amish brittle hair syndrome
  • BIDS syndrome
  • brittle hair-intellectual impairment-decreased fertility-short stature syndrome
  • IBIDS
  • PIBIDS
  • TTD

For more information about naming genetic conditions, see the Genetics Home Reference Condition Naming Guidelines (http://ghr.nlm.nih.gov/ConditionNameGuide) and How are genetic conditions and genes named? (http://ghr.nlm.nih.gov/handbook/mutationsanddisorders/naming) in the Handbook.

What if I still have specific questions about trichothiodystrophy?

Ask the Genetic and Rare Diseases Information Center (http://rarediseases.info.nih.gov/GARD/).

What glossary definitions help with understanding trichothiodystrophy?

autosomal ; autosomal recessive ; cancer ; cell ; congenital ; disability ; DNA ; DNA damage ; DNA repair ; fertility ; gene ; gene transcription ; ichthyosis ; imaging ; incidence ; inherited ; photosensitivity ; protein ; radiation ; recessive ; respiratory ; sensitivity ; short stature ; stature ; sun sensitivity ; syndrome ; transcription ; transcription factor

You may find definitions for these and many other terms in the Genetics Home Reference Glossary (http://www.ghr.nlm.nih.gov/glossary).

References

  • Faghri S, Tamura D, Kraemer KH, Digiovanna JJ. Trichothiodystrophy: a systematic review of 112 published cases characterises a wide spectrum of clinical manifestations. J Med Genet. 2008 Oct;45(10):609-21. doi: 10.1136/jmg.2008.058743. Epub 2008 Jun 25. Review. (http://www.ncbi.nlm.nih.gov/pubmed/18603627?dopt=Abstract)
  • Hashimoto S, Egly JM. Trichothiodystrophy view from the molecular basis of DNA repair/transcription factor TFIIH. Hum Mol Genet. 2009 Oct 15;18(R2):R224-30. doi: 10.1093/hmg/ddp390. Review. (http://www.ncbi.nlm.nih.gov/pubmed/19808800?dopt=Abstract)
  • Itin PH, Sarasin A, Pittelkow MR. Trichothiodystrophy: update on the sulfur-deficient brittle hair syndromes. J Am Acad Dermatol. 2001 Jun;44(6):891-920; quiz 921-4. Review. (http://www.ncbi.nlm.nih.gov/pubmed/11369901?dopt=Abstract)
  • Kleijer WJ, Laugel V, Berneburg M, Nardo T, Fawcett H, Gratchev A, Jaspers NG, Sarasin A, Stefanini M, Lehmann AR. Incidence of DNA repair deficiency disorders in western Europe: Xeroderma pigmentosum, Cockayne syndrome and trichothiodystrophy. DNA Repair (Amst). 2008 May 3;7(5):744-50. doi: 10.1016/j.dnarep.2008.01.014. Epub 2008 Mar 10. (http://www.ncbi.nlm.nih.gov/pubmed/18329345?dopt=Abstract)
  • Kraemer KH, Patronas NJ, Schiffmann R, Brooks BP, Tamura D, DiGiovanna JJ. Xeroderma pigmentosum, trichothiodystrophy and Cockayne syndrome: a complex genotype-phenotype relationship. Neuroscience. 2007 Apr 14;145(4):1388-96. Epub 2007 Feb 1. Review. (http://www.ncbi.nlm.nih.gov/pubmed/17276014?dopt=Abstract)
  • Morice-Picard F, Cario-André M, Rezvani H, Lacombe D, Sarasin A, Taïeb A. New clinico-genetic classification of trichothiodystrophy. Am J Med Genet A. 2009 Sep;149A(9):2020-30. doi: 10.1002/ajmg.a.32902. Review. (http://www.ncbi.nlm.nih.gov/pubmed/19681155?dopt=Abstract)
  • Moslehi R, Signore C, Tamura D, Mills JL, Digiovanna JJ, Tucker MA, Troendle J, Ueda T, Boyle J, Khan SG, Oh KS, Goldstein AM, Kraemer KH. Adverse effects of trichothiodystrophy DNA repair and transcription gene disorder on human fetal development. Clin Genet. 2010 Apr;77(4):365-73. doi: 10.1111/j.1399-0004.2009.01336.x. Epub 2009 Dec 10. (http://www.ncbi.nlm.nih.gov/pubmed/20002457?dopt=Abstract)
  • Stefanini M, Botta E, Lanzafame M, Orioli D. Trichothiodystrophy: from basic mechanisms to clinical implications. DNA Repair (Amst). 2010 Jan 2;9(1):2-10. doi: 10.1016/j.dnarep.2009.10.005. Review. (http://www.ncbi.nlm.nih.gov/pubmed/19931493?dopt=Abstract)

 

The resources on this site should not be used as a substitute for professional medical care or advice. Users seeking information about a personal genetic disease, syndrome, or condition should consult with a qualified healthcare professional. See How can I find a genetics professional in my area? (http://ghr.nlm.nih.gov/handbook/consult/findingprofessional) in the Handbook.

 
Reviewed: May 2010
Published: July 21, 2014