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The information on this page was automatically extracted from online scientific databases.

What is the official name of the BBS7 gene?

The official name of this gene is “Bardet-Biedl syndrome 7.”

BBS7 is the gene's official symbol. The BBS7 gene is also known by other names, listed below.

Read more about gene names and symbols on the About page.

What is the normal function of the BBS7 gene?

From NCBI GeneThis link leads to a site outside Genetics Home Reference.:

This gene encodes one of eight proteins that form the BBSome complex containing BBS1, BBS2, BBS4, BBS5, BBS7, BBS8, BBS9 and BBIP10. The BBSome complex is believed to recruit Rab8(GTP) to the primary cilium and promote ciliogenesis. The BBSome complex assembly is mediated by a complex composed of three chaperonin-like BBS proteins (BBS6, BBS10, and BBS12) and CCT/TRiC family chaperonins. Mutations in this gene are implicated in Bardet-Biedl syndrome, a genetic disorder whose symptoms include obesity, retinal degeneration, polydactyly and nephropathy; however, mutations in this gene and the BBS8 gene are thought to play a minor role and mutations in chaperonin-like BBS genes are found to be a major contributor to disease development in a multiethnic Bardet-Biedl syndrome patient population. Two transcript variants encoding distinct isoforms have been identified for this gene.[provided by RefSeq, Oct 2014]

From UniProtThis link leads to a site outside Genetics Home Reference.:

The BBSome complex is thought to function as a coat complex required for sorting of specific membrane proteins to the primary cilia. The BBSome complex is required for ciliogenesis but is dispensable for centriolar satellite function. This ciliogenic function is mediated in part by the Rab8 GDP/GTP exchange factor, which localizes to the basal body and contacts the BBSome. Rab8(GTP) enters the primary cilium and promotes extension of the ciliary membrane. Firstly the BBSome associates with the ciliary membrane and binds to RAB3IP/Rabin8, the guanosyl exchange factor (GEF) for Rab8 and then the Rab8-GTP localizes to the cilium and promotes docking and fusion of carrier vesicles to the base of the ciliary membrane. The BBSome complex, together with the LTZL1, controls SMO ciliary trafficking and contributes to the sonic hedgehog (SHH) pathway regulation. Required for proper BBSome complex assembly and its ciliary localization.

How are changes in the BBS7 gene related to health conditions?

Genetics Home Reference provides information about Bardet-Biedl syndrome, which is associated with changes in the BBS7 gene.
UniProtThis link leads to a site outside Genetics Home Reference. provides the following information about the BBS7 gene's known or predicted involvement in human disease.

Ciliary dysfunction leads to a broad spectrum of disorders, collectively termed ciliopathies. Overlapping clinical features include retinal degeneration, renal cystic disease, skeletal abnormalities, fibrosis of various organ, and a complex range of anatomical and functional defects of the central and peripheral nervous system. The ciliopathy range of diseases includes Meckel-Gruber syndrome, Bardet-Biedl syndrome, Joubert syndrome, nephronophtisis, Senior-Loken syndrome, and Jeune asphyxiating thoracic dystrophy among others. Single-locus allelism is insufficient to explain the variable penetrance and expressivity of such disorders, leading to the suggestion that variations across multiple sites of the ciliary proteome, including BBS7, influence the clinical outcome.

Bardet-Biedl syndrome 7 (BBS7): A syndrome characterized by usually severe pigmentary retinopathy, early-onset obesity, polydactyly, hypogenitalism, renal malformation and mental retardation. Secondary features include diabetes mellitus, hypertension and congenital heart disease. Bardet-Biedl syndrome inheritance is autosomal recessive, but three mutated alleles (two at one locus, and a third at a second locus) may be required for clinical manifestation of some forms of the disease. The disease is caused by mutations affecting the gene represented in this entry.

NCBI GeneThis link leads to a site outside Genetics Home Reference. lists the following diseases or traits (phenotypes) known or believed to be associated with changes in the BBS7 gene.
  • Bardet-Biedl syndrome 7
OMIM.orgThis link leads to a site outside Genetics Home Reference., a catalog designed for genetics professionals and researchers, provides the following information about the BBS7 gene and its association with health conditions.

Where is the BBS7 gene located?

Cytogenetic Location: 4q27

Molecular Location on chromosome 4: base pairs 121,824,328 to 121,870,496

The BBS7 gene is located on the long (q) arm of chromosome 4 at position 27.

The BBS7 gene is located on the long (q) arm of chromosome 4 at position 27.

More precisely, the BBS7 gene is located from base pair 121,824,328 to base pair 121,870,496 on chromosome 4.

See How do geneticists indicate the location of a gene? in the Handbook.

Where can I find additional information about BBS7?

You and your healthcare professional may find the following resources about BBS7 helpful.

You may also be interested in these resources, which are designed for genetics professionals and researchers.

What other names do people use for the BBS7 gene or gene products?

  • BBS2L1

Where can I find general information about genes?

The Handbook provides basic information about genetics in clear language.

These links provide additional genetics resources that may be useful.

What glossary definitions help with understanding BBS7?


The resources on this site should not be used as a substitute for professional medical care or advice. Users seeking information about a personal genetic disease, syndrome, or condition should consult with a qualified healthcare professional. See How can I find a genetics professional in my area? in the Handbook.

Published: September 28, 2015