Clinical and pathologic correlations in genetically distinct forms of atrichia.
BACKGROUND
The genetic basis of 2 distinct forms of atrichia with papules has recently been defined at the molecular level. In atrichia with papular lesions (APL; Online Mendelian Inheritance in Man [OMIM] 209500), mutations in the hairless gene on chromosome 8p21 have recently been identified. Atrichia with papules also occurs in the clinical setting of vitamin D-dependent rickets type IIA (VDDR IIA; OMIM 277440), resulting from mutations in the vitamin D receptor gene on chromosome 12q12-q14. Despite the distinct genetic basis for both forms of atrichia, the clinical findings are strikingly similar and exhibit classic pathognomonic features unique to this phenotype. We sought to document the clinical and molecular features of APL and VDDR IIA.


METHODS
Molecular analysis of the hairless and vitamin D receptor genes was performed on genomic DNA from probands and family members from 3 families with APL and 2 with VDDR IIA. We present a clinical and histologic comparison of atrichia in patients with APL and VDDR IIA and highlight the genetically heterogeneous basis of atrichia by identification of pathogenetic mutations.


CONCLUSIONS
Increased awareness of these diseases will allow early diagnosis and potential therapeutic intervention for the rickets in VDDR IIA and avoidance of treatment of the atrichia in both APL and VDDR IIA. Their phenotype similarities suggest the possibility of a functional relationship between HR and VDR.
Zlotogorski
Abraham
A
Departments of Dermatology, Hebrew University-Hadassah Medical Center, Jerusalem, Israel. zloto@cc.huji.ac.il
Hochberg
Ze'ev
Z
Mirmirani
Paradi
P
Metzker
Arye
A
Ben-Amitai
Dan
D
Martinez-Mir
Amalia
A
Panteleyev
Andrey A
AA
Christiano
Angela M
AM
D000293:Adolescent; D000328:Adult; D000505:Alopecia / Q000175:diagnosis / Q000235:genetics*; D002675:Child, Preschool; D002898:Chromosomes, Human, Pair 8 / Q000235:genetics; D003241:Consanguinity; D005260:Female; D006580:Genetic Carrier Screening; D006801:Humans; D008297:Male; D008875:Middle Aged; D009154:Mutation; D010641:Phenotype; D018167:Receptors, Calcitriol / Q000235:genetics; D012279:Rickets / Q000150:complications; D017444:Skin Diseases, Papulosquamous / Q000175:diagnosis / Q000235:genetics; D014429:Twins, Dizygotic
D018167:Receptors, Calcitriol