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Rhizomelic chondrodysplasia punctata type 3(RCDP3)

MedGen UID:
374012
Concept ID:
C1838612
Disease or Syndrome
Synonyms: Alkyldihydroxyacetonephosphate synthase deficiency; Alkylglycerone Phosphate Synthase (AGPS) deficiency; RCDP3
SNOMED CT: Rhizomelic chondrodysplasia punctata type 3 (1003858007)
 
Gene (location): AGPS (2q31.2)
 
Monarch Initiative: MONDO:0010823
OMIM®: 600121
Orphanet: ORPHA309803

Definition

Rhizomelic chondrodysplasia punctata (RCDP) is a peroxisomal disorder characterized by disproportionately short stature primarily affecting the proximal parts of the extremities, a typical facial appearance including a broad nasal bridge, epicanthus, high-arched palate, dysplastic external ears, and micrognathia, congenital contractures, characteristic ocular involvement, dwarfism, and severe mental retardation with spasticity. Biochemically, plasmalogen synthesis and phytanic acid alpha-oxidation are defective. Most patients die in the first decade of life. RCDP1 is the most frequent form of RCDP (summary by Wanders and Waterham, 2005). Whereas RCDP1 is a peroxisomal biogenesis disorder (PBD), RCDP3 is classified as a single peroxisome enzyme deficiency (Waterham and Ebberink, 2012). For a discussion of genetic heterogeneity of rhizomelic chondrodysplasia punctata, see 215100. [from OMIM]

Additional description

From MedlinePlus Genetics
Rhizomelic chondrodysplasia punctata is a condition that impairs the normal development of many parts of the body. The major features of this disorder include skeletal abnormalities, distinctive facial features, intellectual disability, and respiratory problems.

Distinctive facial features are also seen with rhizomelic chondrodysplasia punctata. These include a prominent forehead, widely set eyes (hypertelorism), a sunken appearance of the middle of the face (midface hypoplasia), a small nose with upturned nostrils, and full cheeks. Additionally, almost all affected individuals have clouding of the lenses of the eyes (cataracts). The cataracts are apparent at birth (congenital) or develop in early infancy.

Rhizomelic chondrodysplasia punctata is characterized by shortening of the bones in the upper arms and thighs (rhizomelia). Affected individuals also have a specific bone abnormality called chondrodysplasia punctata, which affects the growth of the long bones and can be seen on x-rays. People with rhizomelic chondrodysplasia punctata often develop joint deformities (contractures) that make the joints stiff and painful.

Rhizomelic chondrodysplasia punctata is associated with significantly delayed development and severe intellectual disability. Most children with this condition do not achieve developmental milestones such as sitting without support, feeding themselves, or speaking in phrases. Affected infants grow much more slowly than other children their age, and many also have seizures. Recurrent respiratory infections and life-threatening breathing problems are common. Because of their severe health problems, most people with rhizomelic chondrodysplasia punctata survive only into childhood. It is rare for affected children to live past age 10. However, a few individuals with milder features of the condition have lived into early adulthood.

Researchers have described three types of rhizomelic chondrodysplasia punctata: type 1 (RCDP1), type 2 (RCDP2), and type 3 (RCDP3). The types have similar features and are distinguished by their genetic cause.  https://medlineplus.gov/genetics/condition/rhizomelic-chondrodysplasia-punctata

Clinical features

From HPO
Short femur
MedGen UID:
87499
Concept ID:
C0345375
Congenital Abnormality
An abnormal shortening of the femur.
Short humerus
MedGen UID:
316907
Concept ID:
C1832117
Congenital Abnormality
Underdevelopment of the humerus.
Rhizomelia
MedGen UID:
357122
Concept ID:
C1866730
Congenital Abnormality
Disproportionate shortening of the proximal segment of limbs (i.e. the femur and humerus).
Disproportionate short-limb short stature
MedGen UID:
342370
Concept ID:
C1849937
Finding
A type of disproportionate short stature characterized by a short limbs but an average-sized trunk.
Failure to thrive
MedGen UID:
746019
Concept ID:
C2315100
Disease or Syndrome
Failure to thrive (FTT) refers to a child whose physical growth is substantially below the norm.
Epiphyseal stippling
MedGen UID:
349104
Concept ID:
C1859126
Finding
The presence of abnormal punctate (speckled, dot-like) calcifications in one or more epiphyses.
Reduced alkyl-dihydroxyacetonephosphate synthase activity in cultured fibroblasts
MedGen UID:
1053176
Concept ID:
CN377023
Finding
Activity of alkyl-dihydroxyacetonephosphate (DHAP) synthase below the lower limit of normal in cultured fibroblasts.

Term Hierarchy

CClinical test,  RResearch test,  OOMIM,  GGeneReviews,  VClinVar  
  • CROGVRhizomelic chondrodysplasia punctata type 3
Follow this link to review classifications for Rhizomelic chondrodysplasia punctata type 3 in Orphanet.

Recent clinical studies

Etiology

İli EG, Gezdirici A, Di Pietro E, Yergeau C, Braverman N
Am J Med Genet A 2022 Nov;188(11):3229-3235. Epub 2022 Aug 20 doi: 10.1002/ajmg.a.62959. PMID: 35986576

Prognosis

Itzkovitz B, Jiralerspong S, Nimmo G, Loscalzo M, Horovitz DD, Snowden A, Moser A, Steinberg S, Braverman N
Hum Mutat 2012 Jan;33(1):189-97. Epub 2011 Oct 31 doi: 10.1002/humu.21623. PMID: 21990100

Clinical prediction guides

Itzkovitz B, Jiralerspong S, Nimmo G, Loscalzo M, Horovitz DD, Snowden A, Moser A, Steinberg S, Braverman N
Hum Mutat 2012 Jan;33(1):189-97. Epub 2011 Oct 31 doi: 10.1002/humu.21623. PMID: 21990100

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