Bardet-biedl Syndrome 1; Bbs1

Description

Bardet-Biedl syndrome is an autosomal recessive and genetically heterogeneous ciliopathy characterized by retinitis pigmentosa, obesity, kidney dysfunction, polydactyly, behavioral dysfunction, and hypogonadism (summary by Beales et al., 1999). Eight proteins implicated in the disorder assemble to form the BBSome, a stable complex involved in signaling receptor trafficking to and from cilia (summary by Scheidecker et al., 2014). Genetic Heterogeneity of Bardet-Biedl SyndromeBBS1 is caused by mutation in a gene on chromosome 11q13 (OMIM ); BBS2 (OMIM ), by mutation in a gene on 16q13 (OMIM ); BBS3 (OMIM ), by mutation in the ARL6 gene on 3q11 (OMIM ); BBS4 (OMIM ), by mutation in a gene on 15q22 (OMIM ); BBS5 (OMIM ), by mutation in a gene on 2q31 (OMIM ); BBS6 (OMIM ), by the MKKS gene on 20p12 (OMIM ), mutations in which also cause McKusick-Kaufman syndrome (OMIM ); BBS7 (OMIM ), by mutation in a gene on 4q27 (OMIM ); BBS8 (OMIM ), by mutation in the TTC8 gene on 14q32 (OMIM ); BBS9 (OMIM ), by mutation in a gene on 7p14 (OMIM ); BBS10 (OMIM ), by mutation in a gene on 12q (OMIM ); BBS11 (OMIM ), by mutation in the TRIM32 gene on 9q33 (OMIM ); BBS12 (OMIM ), by mutation in a gene on 4q27 (OMIM ); BBS13 (OMIM ), by mutation in the MKS1 gene (OMIM ) on 17q23, mutations in which also cause Meckel syndrome-1 (OMIM ); BBS14 (OMIM ), by mutation in the CEP290 gene (OMIM ) on 12q21, mutations in which also cause Meckel syndrome-4 (OMIM ) and several other disorders; BBS15 (OMIM ), by mutation in the C2ORF86 gene (OMIM ), which encodes a homolog of the Drosophila planar cell polarity gene 'fritz,' on 2p15; BBS16 (OMIM ), by mutation in the SDCCAG8 gene (OMIM ) on 1q43, mutations in which also cause Senior-Loken syndrome-7 (OMIM ); BBS17 (OMIM ), by mutation in the LZTFL1 gene (OMIM ) on 3p21; BBS18 (OMIM ), by mutation in the BBIP1 gene (OMIM ) on 10q25; BBS19 (OMIM ), by mutation in the IFT27 gene (OMIM ) on 22q12; BBS20 (OMIM ), by mutation in the IFT74 gene (OMIM ) on 9p21; and BBS21 (OMIM ), by mutation in the C8ORF37 gene (OMIM ).The CCDC28B gene (OMIM ) modifies the expression of BBS phenotypes in patients who have mutations in other genes. Mutations in MKS1, MKS3 (TMEM67 ), and C2ORF86 also modify the expression of BBS phenotypes in patients who have mutations in other genes.Although BBS had originally been thought to be a recessive disorder, Katsanis et al. (2001) demonstrated that clinical manifestation of some forms of Bardet-Biedl syndrome requires recessive mutations in 1 of the 6 loci plus an additional mutation in a second locus. While Katsanis et al. (2001) called this 'triallelic inheritance,' Burghes et al. (2001) suggested the term 'recessive inheritance with a modifier of penetrance.' Mykytyn et al. (2002) found no evidence of involvement of the common BBS1 mutation in triallelic inheritance. However, Fan et al. (2004) found heterozygosity in a mutation of the BBS3 gene ({608845.0002}) as an apparent modifier of the expression of homozygosity of the met390-to-arg mutation in the BBS1 gene ({209901.0001}).Allelic disorders include nonsyndromic forms of retinitis pigmentosa: RP51 (OMIM ), caused by TTC8 mutation, and RP55 (OMIM ), caused by ARL6 mutation.

Clinical Features

Top most frequent phenotypes and symptoms related to Bardet-biedl Syndrome 1; Bbs1

  • Intellectual disability
  • Global developmental delay
  • Hearing impairment
  • Ataxia
  • Nystagmus
  • Strabismus
  • Cataract
  • Cryptorchidism
  • High palate
  • Delayed speech and language development

And another 68 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.

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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Bardet-biedl Syndrome 1; Bbs1 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 %
Bardet-Biedl Syndrome Panel.

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

SDCCAG8, ARL6, TRIM32, IFT27, BBS7, TTC8, INPP5E, ADIPOR1, BBS10, BBS12, C8orf37, WDPCP, BBIP1, CCDC28B, TMEM67, CEP290, BBS9, KCNJ13, LZTFL1, MKKS , (...)

View the complete list with 6 more genes
Specificity
12 %
Genes
100 %
Ciliopathies.

By Knight Diagnostic Laboratories - Molecular Diagnostic Center Oregon Health & Science University (United States).

RPE65, RPGR, SDCCAG8, TSC1, TSC2, CEP41, TULP1, USH1C, USH2A, CLRN1, VHL, ZIC3, NEK8, RPGRIP1, CDH23, TMEM237, PCDH15, USH1G, WHRN, TRIM32 , (...)

View the complete list with 73 more genes
Specificity
3 %
Genes
67 %
Bardet-Biedl syndrome CCDC28B related (sequence analysis of CCDC28B gene).

By CGC Genetics (Portugal).

CCDC28B
Specificity
100 %
Genes
34 %
Bardet-Biedl syndrome (NGS panel for 22 genes).

By CGC Genetics (Portugal).

SDCCAG8, ARL6, TRIM32, IFT27, BBS7, TTC8, BBS10, BBS12, WDPCP, BBIP1, CCDC28B, TMEM67, CEP290, BBS9, ALMS1, LZTFL1, MKKS, MKS1, BBS1, BBS2 , (...)

View the complete list with 2 more genes
Specificity
14 %
Genes
100 %
Ciliopathies (NGS panel for 90 genes).

By CGC Genetics (Portugal).

SDCCAG8, SPAG1, CEP41, RSPH1, CFAP298, ARL6, NEK8, TMEM237, TRIM32, NME8, LRRC6, ZNF423, INVS, CEP83, DCDC2, WDR19, CCNO, IFT27, DNAI2, BBS7 , (...)

View the complete list with 70 more genes
Specificity
4 %
Genes
100 %
Mental retardation - different panels.

By Institute of Human Genetics Uniklinik RWTH Aachen (Germany).

RGS7, RIT1, RMRP, BCS1L, RPL10, RPS6KA3, RRAS, SALL1, SC5D, ATXN10, BLM, SCN1A, SCN2A, SCN8A, SCO2, AIMP1, SDCCAG8, SDHA, SDHB, SGSH , (...)

View the complete list with 845 more genes
Specificity
1 %
Genes
100 %
Hereditary kidney disorders - different panels.

By Institute of Human Genetics Uniklinik RWTH Aachen (Germany).

BCS1L, ROBO2, CNNM2, CFB, SALL1, ATXN10, SCNN1A, SCNN1B, SCNN1G, SDCCAG8, SDHA, SDHB, SDHC, SDHD, BMP4, BMP7, SGPL1, SIX1, SIX2, SIX5 , (...)

View the complete list with 386 more genes
Specificity
1 %
Genes
100 %

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Sources and references

You can check the following sources for additional information.

OMIM Genetic Syndrome Finder

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