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An Acvr1 R206H knock-in mouse has fibrodysplasia ossificans progressiva.
J Bone Miner Res. 2012 Aug; 27(8):1746-56.JB

Abstract

Fibrodysplasia ossificans progressiva (FOP; MIM #135100) is a debilitating genetic disorder of dysregulated cellular differentiation characterized by malformation of the great toes during embryonic skeletal development and by progressive heterotopic endochondral ossification postnatally. Patients with these classic clinical features of FOP have the identical heterozygous single nucleotide substitution (c.617G > A; R206H) in the gene encoding ACVR1/ALK2, a bone morphogenetic protein (BMP) type I receptor. Gene targeting was used to develop an Acvr1 knock-in model for FOP (Acvr1(R206H/+)). Radiographic analysis of Acvr1(R206H/+) chimeric mice revealed that this mutation induced malformed first digits in the hind limbs and postnatal extraskeletal bone formation, recapitulating the human disease. Histological analysis of murine lesions showed inflammatory infiltration and apoptosis of skeletal muscle followed by robust formation of heterotopic bone through an endochondral pathway, identical to that seen in patients. Progenitor cells of a Tie2(+) lineage participated in each stage of endochondral osteogenesis. We further determined that both wild-type (WT) and mutant cells are present within the ectopic bone tissue, an unexpected finding that indicates that although the mutation is necessary to induce the bone formation process, the mutation is not required for progenitor cell contribution to bone and cartilage. This unique knock-in mouse model provides novel insight into the genetic regulation of heterotopic ossification and establishes the first direct in vivo evidence that the R206H mutation in ACVR1 causes FOP.

Authors+Show Affiliations

Department of Orthopaedic Surgery, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, 19104, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

22508565

Citation

Chakkalakal, Salin A., et al. "An Acvr1 R206H Knock-in Mouse Has Fibrodysplasia Ossificans Progressiva." Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research, vol. 27, no. 8, 2012, pp. 1746-56.
Chakkalakal SA, Zhang D, Culbert AL, et al. An Acvr1 R206H knock-in mouse has fibrodysplasia ossificans progressiva. J Bone Miner Res. 2012;27(8):1746-56.
Chakkalakal, S. A., Zhang, D., Culbert, A. L., Convente, M. R., Caron, R. J., Wright, A. C., Maidment, A. D., Kaplan, F. S., & Shore, E. M. (2012). An Acvr1 R206H knock-in mouse has fibrodysplasia ossificans progressiva. Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research, 27(8), 1746-56. https://doi.org/10.1002/jbmr.1637
Chakkalakal SA, et al. An Acvr1 R206H Knock-in Mouse Has Fibrodysplasia Ossificans Progressiva. J Bone Miner Res. 2012;27(8):1746-56. PubMed PMID: 22508565.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - An Acvr1 R206H knock-in mouse has fibrodysplasia ossificans progressiva. AU - Chakkalakal,Salin A, AU - Zhang,Deyu, AU - Culbert,Andria L, AU - Convente,Michael R, AU - Caron,Robert J, AU - Wright,Alexander C, AU - Maidment,Andrew D A, AU - Kaplan,Frederick S, AU - Shore,Eileen M, PY - 2012/4/18/entrez PY - 2012/4/18/pubmed PY - 2012/12/10/medline SP - 1746 EP - 56 JF - Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research JO - J. Bone Miner. Res. VL - 27 IS - 8 N2 - Fibrodysplasia ossificans progressiva (FOP; MIM #135100) is a debilitating genetic disorder of dysregulated cellular differentiation characterized by malformation of the great toes during embryonic skeletal development and by progressive heterotopic endochondral ossification postnatally. Patients with these classic clinical features of FOP have the identical heterozygous single nucleotide substitution (c.617G > A; R206H) in the gene encoding ACVR1/ALK2, a bone morphogenetic protein (BMP) type I receptor. Gene targeting was used to develop an Acvr1 knock-in model for FOP (Acvr1(R206H/+)). Radiographic analysis of Acvr1(R206H/+) chimeric mice revealed that this mutation induced malformed first digits in the hind limbs and postnatal extraskeletal bone formation, recapitulating the human disease. Histological analysis of murine lesions showed inflammatory infiltration and apoptosis of skeletal muscle followed by robust formation of heterotopic bone through an endochondral pathway, identical to that seen in patients. Progenitor cells of a Tie2(+) lineage participated in each stage of endochondral osteogenesis. We further determined that both wild-type (WT) and mutant cells are present within the ectopic bone tissue, an unexpected finding that indicates that although the mutation is necessary to induce the bone formation process, the mutation is not required for progenitor cell contribution to bone and cartilage. This unique knock-in mouse model provides novel insight into the genetic regulation of heterotopic ossification and establishes the first direct in vivo evidence that the R206H mutation in ACVR1 causes FOP. SN - 1523-4681 UR - https://www.unboundmedicine.com/medline/citation/22508565/An_Acvr1_R206H_knock_in_mouse_has_fibrodysplasia_ossificans_progressiva_ L2 - https://doi.org/10.1002/jbmr.1637 DB - PRIME DP - Unbound Medicine ER -