Mannosidosis, Alpha B, Lysosomal; Mansa

Description

Alpha-mannosidosis is an autosomal recessive lysosomal storage disease characterized by mental retardation, coarse facial features, skeletal abnormalities, hearing impairment, neurologic motor problems, and immune deficiency. Expression of the disease varies considerably, and there is a wide spectrum of clinical findings and severity. Affected children are often normal at birth and during early development. They present in early childhood with delayed psychomotor development, delayed speech, and hearing loss. Additional features include large head with prominent forehead, rounded eyebrows, flattened nasal bridge, macroglossia, widely spaced teeth, dysostosis multiplex, and motor impairment (summary by Malm and Nilssen, 2008). Classification SystemsTwo classification systems have been used to describe the clinical presentation of alpha-mannosidosis. The earlier system delineated a more severe 'type I,' which shows infantile onset, rapid mental deterioration, hypotonia, splenomegaly, severe dysostosis multiplex, and severe recurrent infections, often resulting in death by age 8 years. Individuals with the less severe 'type II' show normal early development with later childhood development of mental retardation, hearing loss, coarse facies, neurologic deterioration, and survival well into adulthood (summary by Desnick et al., 1976 and Gotoda et al., 1998). A later classification system delineated 3 clinical types. Type 1 is the mildest form, with onset after age 10 years, without skeletal abnormalities and very slow progression. Type 2 is a moderate form, with onset before age 10 years, presence of skeletal abnormalities, and slow progression with development of ataxia by age 20 to 30 years. Type 3 is the severe form, with onset in early infancy, skeletal abnormalities, and obvious progression leading to early death from primary central nervous system involvement or myopathy. Most patients belong to clinical type 2 (summary by Malm and Nilssen, 2008). Despite the clinical heterogeneity of the disorder, there are no apparent genotype/phenotype correlations (Berg et al., 1999; Riise Stensland et al., 2012).

Clinical Features

Top most frequent phenotypes and symptoms related to Mannosidosis, Alpha B, Lysosomal; Mansa

  • Intellectual disability
  • Global developmental delay
  • Generalized hypotonia
  • Hearing impairment
  • Scoliosis
  • Ataxia
  • Growth delay
  • Hypertelorism
  • Nystagmus
  • Strabismus

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Incidence and onset information

— Based on the latest data available MANNOSIDOSIS, ALPHA B, LYSOSOMAL; MANSA have a estimated prevalence of 0.1 per 100k worldwide.
— The onset for some of the known clinical features related to this disease may vary, including adult onset .

Alternative names

Mannosidosis, Alpha B, Lysosomal; Mansa Is also known as alpha-mannosidosis, lysosomal alpha-d-mannosidase deficiency, alpha-mannosidase b deficiency.

Researches and researchers

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Mannosidosis, Alpha B, Lysosomal; Mansa Recommended genes panels

Panel Name, Specifity and genes Tested/covered
MitoMetĀ®Plus aCGH Analysis.

By Baylor Miraca Genetics Laboratories (United States).

RGS9, RHO, GRK1, RLBP1, RNASEL, BCS1L, RP1, RP2, RP9, RPE65, RPGR, RPL35A, MRPL3, RPS14, RS1, SAG, SARDH, SCO2, SCP2, SDHB , (...)

View the complete list with 612 more genes
Specificity
1 %
Genes
100 %
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 %
Lysosomal Storage Disease Panel.

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

SGSH, SLC17A5, SMPD1, TCF4, MCOLN1, NPC2, ADAMTSL2, DNAJC5, SUMF1, TPP1, CLN3, CLN5, CLN6, CLN8, DYM, ANTXR2, COL11A2, PEX26, GNE, CTNS , (...)

View the complete list with 54 more genes
Specificity
2 %
Genes
100 %
NGS Hearing Loss Panel.

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

SIX1, SNAI2, SMPX, SOX10, TECTA, TIMM8A, TJP2, TMPRSS3, USH1C, USH2A, CLRN1, TSPEAR, WFS1, ESPN, CDH23, CACNA1D, ACTG1, PCDH15, USH1G, WHRN , (...)

View the complete list with 70 more genes
Specificity
2 %
Genes
100 %
Alpha-mannosidosis.

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

MAN2B1
Specificity
100 %
Genes
100 %
Lysosomal Storage Disease Panel.

By Molecular Genetics Laboratory Centro de Investigaciones Endocrinologicas "Dr. Cesar Bergada" (Argentina).

SGSH, SLC17A5, SMPD1, MCOLN1, NPC2, DNAJC5, SUMF1, TPP1, CLN3, CLN5, CLN6, CLN8, GNPTG, CTNS, CTSD, CTSK, HGSNAT, MFSD8, GNPTAB, AGA , (...)

View the complete list with 30 more genes
Specificity
2 %
Genes
100 %
NGS Neurodegenerative disorders Multi-Gene Panel (73 genes).

By Laboratory of genome diagnostics Academic Medical Center, University of Amsterdam (Netherlands).

SGSH, SLC2A1, SPR, NPC2, CBS, APTX, COQ8A, PDSS1, MMAA, MMAB, LMBRD1, PDSS2, MMACHC, MMADHC, COQ2, COQ9, CYP27A1, HGSNAT, DBT, DDC , (...)

View the complete list with 39 more genes
Specificity
2 %
Genes
100 %

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Sources and references

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ORPHANET OMIM Rare Disease Search Engine

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