RGD Reference Report - Embryonic myosin heavy-chain mutations cause distal arthrogryposis and developmental myosin myopathy that persists postnatally. - Rat Genome Database

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Embryonic myosin heavy-chain mutations cause distal arthrogryposis and developmental myosin myopathy that persists postnatally.

Authors: Tajsharghi, Homa  Kimber, Eva  Kroksmark, Anna-Karin  Jerre, Ragnar  Tulinius, Mar  Oldfors, Anders 
Citation: Tajsharghi H, etal., Arch Neurol. 2008 Aug;65(8):1083-90. doi: 10.1001/archneur.65.8.1083.
RGD ID: 12792960
Pubmed: PMID:18695058   (View Abstract at PubMed)
DOI: DOI:10.1001/archneur.65.8.1083   (Journal Full-text)


BACKGROUND: Myosin is a molecular motor and the essential part of the thick filament of striated muscle. The expression of myosin heavy-chain (MyHC) isoforms is developmentally regulated. The embryonic isoform encoded from MYH3 (OMIM *160720) is expressed during fetal life. Recently, mutations in MYH3 were demonstrated to be associated with congenital joint contractures, that is, Freeman-Sheldon and Sheldon-Hall syndromes, which are both distal arthrogryposis syndromes. Mutations in other MyHC isoforms cause myopathy. It is unknown whether MYH3 mutations cause myopathy because muscle tissue has not been studied.
OBJECTIVES: To determine whether novel MYH3 mutations are associated with distal arthrogryposis and to demonstrate myopathic changes in muscle biopsy specimens from 4 patients with distal arthrogryposis and MYH3 mutations.
DESIGN: In a cohort of patients with distal arthrogryposis, we analyzed the entire coding sequence of MYH3. Muscle biopsy specimens were obtained, and in addition to morphologic analysis, the expression of MyHC isoforms was investigated at the protein and transcript levels.
RESULTS: We identified patients from 3 families with novel MYH3 mutations. These mutations affect developmentally conserved residues that are located in different regions of the adenosine triphosphate-binding pocket of the MyHC head. The embryonic (MYH3) isoform was not detected in any of the muscle biopsy samples, indicating a normal developmental downregulation of MYH3 in these patients. However, morphologic analysis of muscle biopsy specimens from the 4 patients revealed mild and variable myopathic features and a pathologic upregulation of the fetal MyHC isoform (MYH8) in 1 patient.
CONCLUSIONS: Distal arthrogryposis associated with MYH3 mutations is secondary to myosin myopathy, and postnatal muscle manifestations are variable.

RGD Manual Disease Annotations    Click to see Annotation Detail View
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
distal arthrogryposis type 2B  IAGP 12792960DNA:missense mutation:exon:p.A234T (769C>T) (human)RGD 
distal arthrogryposis type 2B  ISOMYH3 (Homo sapiens)12792960; 12792960DNA:missense mutation:exon:p.A234T (769C>T) (human)RGD 

Objects Annotated

Genes (Rattus norvegicus)
Myh3  (myosin heavy chain 3)

Genes (Mus musculus)
Myh3  (myosin, heavy polypeptide 3, skeletal muscle, embryonic)

Genes (Homo sapiens)
MYH3  (myosin heavy chain 3)


Additional Information