Hypohidrotic ectodermal dysplasia is one of about types of ectodermal dysplasia in humans. Before birth, these disorders result in the abnormal. Disease definition. Hypohidrotic ectodermal dysplasia (HED) is a genetic disorder of ectoderm development characterized by malformation of ectodermal. Hypohidrotic ectodermal dysplasia with immunodeficiency (HED-ID) is a type of HED (see this term) characterized by the malformation of ectodermal structures.

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They were then viewed microscopically to quantify the number of eccrine sweat glands and hair follicles and to identify structural malformations. Check this box if you wish to receive a copy of your message. The toothless men of Sind.

Orphanet: Hypohidrotic ectodermal dysplasia with immunodeficiency

Clinical study of a family hypohidrotif 30 over three generations. Most often, the parents of an individual with an autosomal recessive disorder hypohidroticc carriers of one copy of the altered gene but do not show signs and symptoms of the disorder.

Of 3 subjects who lacked eccrineducts in a single 4-mm horizonally sectioned palmar biopsy specimen, only 1 had no detectable sweating; the other 2 had minimal sweating. The authors suggested autosomal dominant inheritance. Privacy Policy Terms of Use.

Hypohidrotic ectodermal dysplasia HED is a rare inherited multisystem disorder that belongs to hyppohidrotic group of diseases known as ectodermal dysplasias. Teeth were not peg-shaped, androgenic hair was normally distributed, and nails were not dystrophic. If a female is operating on her carrier X she will show symptoms.

Color blindness red and green, but not blue Ocular albinism 1 Norrie disease Choroideremia Other: Noninvasivetrichograms and sweat testing can only support the diagnosis of HED as they are not sensitive or highly specific.


Summary Epidemiology Prevalence is not known. Ancient linkage groups and frozen accidents.

Hypohidrotic ectodermal dysplasia

The starch-iodide paper test was performed to evaluate eccrine function. Transillumination revealed 3 to 5 and 6 to 7 meibomian-gland ducts per lower eyelid in the twins, respectively, compared to only 1 gland duct in their untreated brother.

Van der Hout, A. Create a personal account to register for email alerts with links to free full-text articles. Recognition and reanalysis hypohodrotic a cell line from a manifesting female with X linked hypohidrotic ectodermal dysplasia and an X;autosome balanced translocation. Seventy-three percent of obligate heterozygous females had 1 or more congenitally missing teeth, and most had smaller teeth, One daughter had severe thinning of the hair and several mothers were known to wear wigs.

In addition, total absence of sweating was observed.

Hypohidrotic Ectodermal Dysplasia – NORD (National Organization for Rare Disorders)

However, the skin around the eyes periorbital may be darkly pigmented hyperpigmentation and finely wrinkled, appearing prematurely aged. A bonus to all MIMmatch users is the option to sign up for updates on new gene-phenotype relationships.

Ward RE, dywplasia al. CC HPO: Electron microscopy showed numerous vacuoles and lipid droplets in and around corneocytes and many hgpohidrotic keratohyaline granules.

Some ectodermal dysplasias are here classified as congenital disorders characterized by abnormal development in 2 or more ectodermal structures hair, nails, teeth, and sweat glands without other systemic findings. Thurnam reported 2 male first cousins and described a carrier, their maternal grandmother, with a hereditary syndrome associated with sparse hair, missing teeth, and dry skin.

Recent studies have identified 3 unique loci for HED: Typical clinical manifestations also include dryness of the skin, eyes, airways, and mucous membranes presumably due to the defective development of several exocrine glands.

Physical examination of the patient revealed hyperthermia, dry skin, hyperpigmentation around the eyes, sparse hair, eyebrows, and eyelashes, and hypodontia with irregularly shaped teeth. Richards and Kaplan described a female infant with neonatal pyrexia due to anhidrotic ectodermal dysplasia.


He had a near-normal number of meibomian glands, with 11 and 15 gland ducts per lower eyelid, and he had 9 tooth germs, compared to only 2 tooth buds in his affected 2-year-old brother. The authors noted that mutations were detected in only one-tenth of patients studied.

Rare Disease Database

Information on current clinical trials is posted on the Internet at www. Cell surface receptor deficiencies. In 2 Han Chinese brothers with X-linked hypohidrotic ectodermal dysplasia and their unaffected mother, Huang et al.

In 13 HED families with 16 affected males, Saksena and Bixler described detailed facial characteristics, including prominent forehead, narrow and short maxillary regions, small palatal depth, small cranial length, and depressed nasal root and bridge.

General Discussion Hypohidrotic ectodermal dysplasia HED is a rare inherited multisystem disorder that belongs to the group of diseases known as ectodermal dysplasias. The primary goals were to gather clinical information from a relatively large cohort of affected families, to compare the affected subjects with asample of unaffected individuals, and to determine a clinicopathologic correlation that may be helpful in establishing the diagnosis.

Genetic analysis is not routinely available in these cases. Treatment may require the coordinated efforts of a team of specialists who need to systematically and comprehensively plan an affected individual’s treatment. In conclusion, we have defined the value of a few simple tests in thediagnosis of HED Table 2. Most of the patients suffer from ”dry eye” problems e.