Achondrogenesis, Type Ib; Acg1b

Description

The term achondrogenesis has been used to characterize the most severe forms of chondrodysplasia in humans, invariably lethal before or shortly after birth. Achondrogenesis type I is a severe chondrodystrophy characterized radiographically by deficient ossification in the lumbar vertebrae and absent ossification in the sacral, pubic and ischial bones and clinically by stillbirth or early death (Maroteaux and Lamy, 1968; Langer et al., 1969). In addition to severe micromelia, there is a disproportionately large cranium due to marked edema of soft tissues. Classification of AchondrogenesisAchondrogenesis was traditionally divided into 2 types: type I (Parenti-Fraccaro) and type II (Langer-Saldino). Borochowitz et al. (1988) suggested that achondrogenesis type I of Parenti-Fraccaro should be classified into 2 distinct disorders: type IA (ACG1A ), corresponding to the cases originally published by Houston et al. (1972) and Harris et al. (1972), and type IB, corresponding to the case originally published by Fraccaro (1952). Analysis of the case reported by Parenti (1936) by Borochowitz et al. (1988) suggested the diagnosis of achondrogenesis type II, i.e., the Langer-Saldino type (OMIM ). Type IA would be classified as lethal achondrogenesis, Houston-Harris type; type IB, lethal achondrogenesis, Fraccaro type; and type II, lethal achondrogenesis-hypochondrogenesis, Langer-Saldino type. Superti-Furga (1996) suggested that hypochondrogenesis should be considered separately from achondrogenesis type II because the phenotype can be much milder.

Clinical Features

Top most frequent phenotypes and symptoms related to Achondrogenesis, Type Ib; Acg1b

  • Micrognathia
  • Macrocephaly
  • Frontal bossing
  • Anteverted nares
  • Respiratory insufficiency
  • Short neck
  • Edema
  • Short nose
  • Long philtrum
  • Malar flattening

And another 22 symptoms. If you need more information about this disease we can help you.

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Incidence and onset information

— Currently we don't have prevalence information about this disease (Not enough data available about incidence and published cases.)
No data available about the known clinical features onset.

Alternative names

Achondrogenesis, Type Ib; Acg1b Is also known as achondrogenesis, fraccaro type.

Researches and researchers

Currently, we don't have any information about doctors, researches or researchers related to this disease. Please contact us if you would like to appear here.


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Achondrogenesis, Type Ib; Acg1b Recommended genes panels

Panel Name, Specifity and genes Tested/covered
GeneAware Complete Panel Version 2 (Female).

By Baylor Miraca Genetics Laboratories (United States).

RMRP, BCS1L, SACS, BLM, SGCA, SGCB, SGCG, SGSH, SLC12A6, SLC17A5, SLC22A5, SLC25A13, SLC25A15, SLC26A2, SLC35A3, SLC7A7, SMN1, SMPD1, BTD, BTK , (...)

View the complete list with 139 more genes
Specificity
1 %
Genes
100 %
GeneAware Complete Panel Version 2 (Male).

By Baylor Miraca Genetics Laboratories (United States).

RMRP, BCS1L, SACS, BLM, SGCA, SGCB, SGCG, SGSH, SLC12A6, SLC17A5, SLC22A5, SLC25A13, SLC25A15, SLC26A2, SLC35A3, SLC7A7, SMN1, SMPD1, BTD, TGM1 , (...)

View the complete list with 129 more genes
Specificity
1 %
Genes
100 %
NGS Skeletal Dysplasia Panel.

By Greenwood Genetic Center Diagnostic Laboratories Greenwood Genetic Center (United States).

SLC26A2, SOX9, TRPV4, COL1A2, COMP, FGFR3, FLNA, HSPG2
Specificity
13 %
Genes
100 %
DTDST-related dysplasias: Sulfate Transporter-Related Osteochondrodysplasia.

By Centre of Molecular Diseases (CMM) CHUV (Switzerland).

SLC26A2
Specificity
100 %
Genes
100 %
Skeletal Dysplasia Panel, Sequencing and Deletion/Duplication.

By ARUP Laboratories, Molecular Genetics and Genomics (United States).

RUNX2, SLC26A2, SOX9, TRIP11, SERPINH1, TRPV4, FKBP10, WDR19, P3H1, EVC2, SLC35D1, COL1A2, COMP, CRTAP, TTC21B, DLL3, WDR35, IFT80, DYNC2H1, EBP , (...)

View the complete list with 17 more genes
Specificity
3 %
Genes
100 %
Skeletal Dysplasia Panel, Sequencing and Deletion/Duplication, Fetal.

By ARUP Laboratories, Molecular Genetics and Genomics (United States).

RUNX2, SLC26A2, SOX9, TRIP11, SERPINH1, TRPV4, FKBP10, WDR19, P3H1, EVC2, SLC35D1, COL1A2, COMP, CRTAP, TTC21B, DLL3, WDR35, IFT80, DYNC2H1, EBP , (...)

View the complete list with 17 more genes
Specificity
3 %
Genes
100 %
SLC26A2. Detection of the mutations p.Arg279Trp, c.-26 2T>C and p.Cys653Ser by sequencing.

By Instituto de Medicina Genomica Instituto de Medicina Genomica (Spain).

SLC26A2
Specificity
100 %
Genes
100 %
SLC26A2. Detection of the mutations IVS1 2T>C, p.Arg178X, p.Arg279Trp, p.Val340del and p.Cys653Ser by sequencing.

By Instituto de Medicina Genomica Instituto de Medicina Genomica (Spain).

SLC26A2
Specificity
100 %
Genes
100 %

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Sources and references

You can check the following sources for additional information.

OMIM ORPHANET Genetic Syndrome Finder

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