Hypotrichosis is the term dermatologists use to describe a condition of no hair growth.
Aplasia cutis congenita, or congenital aplasia, is a developmental defect where, for reasons not understood, the skin does not fully form as an embryo develops.
While congenital atrichia is genetic and runs in families, it is a gene defect that can spontaneously develop in some embryos born to parents who do not have the condition.
A few forms of hypotrichosis are worth mentioning, either because they are relatively common or because they are interesting in terms of understanding hair follicles.
Congenital atrichia or papular atrichia is a unique condition in terms of the hair loss pattern.
The mechanism of congenital atrichia is not fully understood, but it seems that as the hair follicles enter their first resting (telogen) state in early childhood, the two cell types get separated from each other.
MarieUnnacongenitalhypotrichosis is listed as a "rare disease" by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH).
This means that MarieUnnacongenitalhypotrichosis, or a subtype of MarieUnnacongenitalhypotrichosis, affects less than 200,000 people in the US population.
They list MarieUnnacongenitalhypotrichosis as a "rare disease".
This study however quotes the prevalence of alopecia areata in infants as a congenital condition - in other words, when the alopecia areata is present from birth.
Except for some hair growth in her brows and lashes, there was not much change in her condition.
Since previous reports of congenital alopecia areata have indicated the condition to be caused possibly by premature birth, the above case studies are good examples of classic congenital alopecia areata.
Acheiropodia is an autosomal recessive developmental disorder presenting with bilateral congenital amputations of the upper and lower extremities and aplasia of the hands and feet.
3-phosphoglycerate dehydrogenase (PHGDH) deficiency is a disorder of L-serine biosynthesis that is characterized by congenital microcephaly, psychomotor retardation, and seizures.
An autosomal dominant congenital myopathy with cores and rods is associated with a neomutation in the RYR1 gene encoding the skeletal muscle ryanodine receptor.
IngentaConnect Table Of Contents: Clinical & Experimental Dermatology(Site not responding. Last check: 2007-10-26)
MarieUnna hereditary hypotrichosis: report of a Chinese family and evidence for genetic heterogeneity
Multiple congenital melanocytic naevi presenting with neurofibroma-like lesions complicated by malignant melanoma
Topical imidazoquinoline therapy of cutaneous squamous cell carcinoma polarizes lymphoid and monocyte/macrophage populations to a Th1 and M1 cytokine pattern
Epigenhome(Site not responding. Last check: 2007-10-26)
53 Carter JM, McLean WHI, West S and Quinlan RA (2000) Mapping of the human CP49 gene and identification of an intragenic polymorphic marker to allow genetic linkage analysis in autosomal dominant congenital cataract.
68 Kremer H, Lavrijsen APM, McLean WHI, Lane EB, Melchers D, Ruiter DJ, Mariman ECM, Steijlen PM (1998) An atypical form of bullous congenital ichthyosiform erythroderma is caused by a mutation in the L12 linker region of keratin 1.
80 Pulkinnen L, Kimonis VE, Xu Y, Spanou EN, McLean WHI and Uitto J (1997) Homozygous a6 integrin mutation in junctional epidermolysis bullosa with congenital duodenal atresia.