eMedicine Specialties > Dermatology > Pediatric Diseases
Menkes Kinky Hair Disease
Updated: Nov 13, 2009
Introduction
Background
Menkes kinky hair syndrome is an X-linked recessive multisystemic lethal disorder of copper metabolism. The clinical phenotype is marked by fine silvery wiry hair, doughy skin, connective tissue disturbances, and progressive neurologic deterioration. In 1962, Menkes et al1 first described the syndrome, and, 10 years later, Danks et al2,3 noted the association with copper metabolism. The affected copper-transporting p-type ATPase (ATP7A) gene was cloned in 1993.
In Menkes kinky hair syndrome, intestinal copper uptake by brush border cells is normal, but copper transport to other tissues is affected. This change alters the activities of various copper-dependent metalloenzymes. Male infants who are affected typically die by the time they are aged 2-3 years. Carrier female patients may have only a hair-shaft abnormality (ie, pili torti).
Pathophysiology
In Menkes kinky hair syndrome, a defect in intestinal copper transport with associated low serum copper and ceruloplasmin levels results in a deficiency in copper-dependent enzyme activity. Copper-dependent metalloenzymes relevant to the clinical phenotype include tyrosinase (pigmentation of skin and hair), lysyl oxidase (elastin and collagen cross-linking), ascorbate oxidase (skeletal development), monoamine oxidase (possibly responsible for pili torti), superoxide dismutase (free-radical detoxification), dopamine beta-hydroxylase (catecholamine production), peptidyl-glycine alpha-amidating mono-oxygenase (bioactivation of peptide hormones), and cytochrome c oxidase (electron transport and possibly responsible for hypothermia). The resulting defects are reflected in the clinical phenotype.
Frequency
United States
Menkes kinky hair syndrome occurs in 1 case per 300,000 population.
International
In Australia, Menkes kinky hair syndrome occurs in 1 case per 35,000 population. Worldwide, Menkes kinky hair syndrome occurs in 1 case per 300,000 population.
Mortality/Morbidity
- Progressive neurologic deterioration occurs in persons with Menkes kinky hair syndrome.
- Death, usually due to pneumonia, occurs by the time the patient is aged 2 or 3 years.
Race
No racial predilection exists for Menkes kinky hair syndrome.
Sex
- The phenotype of Menkes kinky hair syndrome is manifest in male patients.
- Female carriers may have pili torti and uneven skin pigmentation, which appears unilaterally or along the lines of Blaschko.
Age
Symptoms of Menkes kinky hair syndrome are noted within the patient's first few months of life.
- Hair changes may not be present in newborns, and not all hairs are affected.
- Seizures usually begin within the patient's first few days or months of life.
- Hypotonia and developmental delays are typically noted during the patient's first year of life.
Clinical
History
- Individuals with Menkes kinky hair syndrome typically have hypotonia and seizures when they are infants.
- Although development initially appears normal, marked developmental delays are noted within the patient's first year of life.
- Feeding difficulties are common in individuals with Menkes kinky hair syndrome.
Physical
Common early physical features of Menkes kinky hair syndrome are microcephaly; distinct facial features; and silvery, wiry scalp hair.
Physical findings of Menkes kinky hair syndrome are as follows:
- Hair (Changes may not be present at birth.)
- Pili torti (most common but not pathognomonic)
- Trichorrhexis nodosa
- Hypopigmented, sparse, short, brittle, kinky, steel wool–like
- Sparse, broken, horizontal eyebrows
- Sparse eyelashes
- Skin
- Hypopigmented, pale, mottled (cutis marmorata pattern), doughy, lax
- Pudgy cheeks
- Cupid's bow upper lip
- Central nervous system - Progressive deterioration marked by lethargy, seizures, mental retardation, motor retardation, hypotonia, hypothermia, and microcephaly
- Musculoskeletal
- Failure to thrive
- Metaphyseal widening
- Spurs of the long bones
- Wormian bones in the sagittal and lambdoid sutures
- Cardiovascular
- Tortuous arteries
- Intimal fragmentation of the internal elastic lamina - aneurysm
- Venous phlebectasia4
- Genitourinary5
- Bladder diverticula
- Nephrocalcinosis6
- Calciuria, aminoaciduria, albuminuria, beta2 microalbuminuria
- Other - Hypothermia (33-35°C)
Causes
Menkes kinky hair syndrome is a genodermatosis.7
- The gene locus for Menkes kinky hair syndrome is in band Xq13.3.
- Mutations at band Xq13.3 result in increased copper uptake in the small intestine, but an inability to transport copper from the brush border intestinal cells into the plasma results in a total-body copper deficiency.8,9
- The defective protein is a copper-binding ATPase, ATP7A, localized to the trans-Golgi apparatus. The defective protein is present in all tissues, although it is barely detectable in hepatocytes.10,11,12
- Differences in ATP7A gene expression underlie intrafamilial clinical and biochemical phenotype variability.13,14
More on Menkes Kinky Hair Disease |
Overview: Menkes Kinky Hair Disease |
| Differential Diagnoses & Workup: Menkes Kinky Hair Disease |
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| Follow-up: Menkes Kinky Hair Disease |
| References |
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References
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Further Reading
Keywords
Menkes kinky hair disease, Menkes kinky hair syndrome, steely hair syndrome, trichopoliodystrophy, copper metabolism, copper deficiency, pili torti, hair-shaft abnormality
Overview: Menkes Kinky Hair Disease