The osteopetroses are a heterogeneous group of disorders characterized by increased bone density and the replacement of trabecular bone with compact bone due to reduced osteoclastic bone resorption. Some osteopetrotic conditions exhibit additional clinical features including renal tubular acidosis and secondary neurological impairment. In forms of osteopetrosis with normal osteoclast counts, most of the mutated genes encode proteins that regulate the intra- and extracellular pH of osteoclasts, such as TCIRG1 gene encoding for the a3 subunit of the V-ATPase and CLCN7 gene. In cases with decreased osteoclast counts, osteoclast differentiation is impaired by mutations in RANKL or RANK. These RANK-deficient patients could be rescued by hematopoietic stem cell transplantation.
Category
Congenital malformation
Brite
Human diseases in ICD-11 classification [BR:br08403]
20 Developmental anomalies
Multiple developmental anomalies or syndromes
LD24 Syndromes with skeletal anomalies as a major feature
H00436 Osteopetrosis
Pathway-based classification of diseases [BR:br08402]
Signal transduction
nt06505 WNT signaling
H00436 Osteopetrosis
nt06516 TNF signaling
H00436 Osteopetrosis
Van Wesenbeeck L, Cleiren E, Gram J, Beals RK, Benichou O, Scopelliti D, Key L, Renton T, Bartels C, Gong Y, Warman ML, De Vernejoul MC, Bollerslev J, Van Hul W
Title
Six novel missense mutations in the LDL receptor-related protein 5 (LRP5) gene in different conditions with an increased bone density.
Del Fattore A, Fornari R, Van Wesenbeeck L, de Freitas F, Timmermans JP, Peruzzi B, Cappariello A, Rucci N, Spera G, Helfrich MH, Van Hul W, Migliaccio S, Teti A
Title
A new heterozygous mutation (R714C) of the osteopetrosis gene, pleckstrin homolog domain containing family M (with run domain) member 1 (PLEKHM1), impairs vesicular acidification and increases TRACP secretion in osteoclasts.
Sobacchi C, Frattini A, Guerrini MM, Abinun M, Pangrazio A, Susani L, Bredius R, Mancini G, Cant A, Bishop N, Grabowski P, Del Fattore A, Messina C, Errigo G, Coxon FP, Scott DI, Teti A, Rogers MJ, Vezzoni P, Villa A, Helfrich MH
Title
Osteoclast-poor human osteopetrosis due to mutations in the gene encoding RANKL.
Venta PJ, Welty RJ, Johnson TM, Sly WS, Tashian RE
Title
Carbonic anhydrase II deficiency syndrome in a Belgian family is caused by a point mutation at an invariant histidine residue (107 His----Tyr): complete structure of the normal human CA II gene.
Van Wesenbeeck L, Odgren PR, Coxon FP, Frattini A, Moens P, Perdu B, MacKay CA, Van Hul E, Timmermans JP, Vanhoenacker F, Jacobs R, Peruzzi B, Teti A, Helfrich MH, Rogers MJ, Villa A, Van Hul W
Title
Involvement of PLEKHM1 in osteoclastic vesicular transport and osteopetrosis in incisors absent rats and humans.
Guerrini MM, Sobacchi C, Cassani B, Abinun M, Kilic SS, Pangrazio A, Moratto D, Mazzolari E, Clayton-Smith J, Orchard P, Coxon FP, Helfrich MH, Crockett JC, Mellis D, Vellodi A, Tezcan I, Notarangelo LD, Rogers MJ, Vezzoni P, Villa A, Frattini A
Title
Human osteoclast-poor osteopetrosis with hypogammaglobulinemia due to TNFRSF11A (RANK) mutations.
