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Bardet-Biedl syndrome 6(BBS6)

MedGen UID:
347610
Concept ID:
C1858054
Disease or Syndrome
Synonym: BBS6
 
Gene (location): MKKS (20p12.2)
 
Monarch Initiative: MONDO:0011523
OMIM®: 605231

Definition

Bardet-Biedl syndrome-6 (BBS6) is an autosomal recessive disorder with the cardinal features of postaxial polydactyly, retinitis pigmentosa, kidney defects, obesity, and mental retardation (Slavotinek et al., 2000). Zaghloul and Katsanis (2009) estimated that mutations in the MKKS gene account for 5.8% of the total BBS mutational load. For a general phenotypic description and a discussion of genetic heterogeneity of Bardet-Biedl syndrome, see BBS1 (209900). [from OMIM]

Clinical features

From HPO
Hypospadias
MedGen UID:
163083
Concept ID:
C0848558
Congenital Abnormality
Abnormal position of urethral meatus on the ventral penile shaft (underside) characterized by displacement of the urethral meatus from the tip of the glans penis to the ventral surface of the penis, scrotum, or perineum.
Vaginal atresia
MedGen UID:
232948
Concept ID:
C1321884
Congenital Abnormality
Congenital occlusion of the vagina or adhesion of the walls of the vagina causing occlusion.
External genital hypoplasia
MedGen UID:
344478
Concept ID:
C1855333
Finding
Underdevelopment of part or all of the external reproductive organs.
Renal cyst
MedGen UID:
854361
Concept ID:
C3887499
Disease or Syndrome
A fluid filled sac in the kidney.
Syndactyly
MedGen UID:
52619
Concept ID:
C0039075
Congenital Abnormality
Webbing or fusion of the fingers or toes, involving soft parts only or including bone structure. Bony fusions are referred to as "bony" syndactyly if the fusion occurs in a radio-ulnar axis. Fusions of bones of the fingers or toes in a proximo-distal axis are referred to as "symphalangism".
Postaxial polydactyly
MedGen UID:
67394
Concept ID:
C0220697
Disease or Syndrome
Polydactyly refers to the occurrence of supernumerary digits and is the most frequent of congenital hand and foot deformities. Based on the location of the extra digits, polydactyly can be classified into preaxial, involving the thumb or great toe; postaxial, affecting the fifth digit; and central, involving the 3 central digits. Postaxial polydactyly (PAP) is further subclassified into 2 types: in type A, a well-formed extra digit articulates with the fifth or a sixth metacarpal, whereas in type B, a rudimentary, poorly developed extra digit is present (summary by Umm-e-Kalsoom et al., 2012). Genetic Heterogeneity of Postaxial Polydactyly Other forms of postaxial polydactyly type A include PAPA2 (602085) on chromosome 13q21; PAPA3 (607324) on chromosome 19p13; PAPA4 (608562) on chromosome 7q22; PAPA5 (263450) on chromosome 13q13; PAPA6 (615226), caused by mutation in the ZNF141 gene (194648) on chromosome 4p16; PAPA7 (617642), caused by mutation in the IQCE gene (617631) on chromosome 7p22; PAPA8 (618123), caused by mutation in the GLI1 gene (165220) on chromosome 12q13; PAPA9 (618219), caused by mutation in the FAM98A gene (617273) on chromosome 8q22; and PAPA10 (618498), caused by mutation in the KIAA0825 gene (617266) on chromosome 5q15.
Obesity
MedGen UID:
18127
Concept ID:
C0028754
Disease or Syndrome
Accumulation of substantial excess body fat.
Intellectual disability
MedGen UID:
811461
Concept ID:
C3714756
Mental or Behavioral Dysfunction
Intellectual disability, previously referred to as mental retardation, is characterized by subnormal intellectual functioning that occurs during the developmental period. It is defined by an IQ score below 70.
Diabetes mellitus
MedGen UID:
8350
Concept ID:
C0011849
Disease or Syndrome
A group of abnormalities characterized by hyperglycemia and glucose intolerance.
Rod-cone dystrophy
MedGen UID:
1632921
Concept ID:
C4551714
Disease or Syndrome
An inherited retinal disease subtype in which the rod photoreceptors appear to be more severely affected than the cone photoreceptors. Typical presentation is with nyctalopia (due to rod dysfunction) followed by loss of mid-peripheral field of vision, which gradually extends and leaves many patients with a small central island of vision due to the preservation of macular cones.
Pigmentary retinopathy
MedGen UID:
1643295
Concept ID:
C4551715
Disease or Syndrome
An abnormality of the retina characterized by pigment deposition. It is typically associated with migration and proliferation of macrophages or retinal pigment epithelial cells into the retina; melanin from these cells causes the pigmentary changes. Pigmentary retinopathy is a common final pathway of many retinal conditions and is often associated with visual loss.

Professional guidelines

Curated

Slavotinek A, Beales P
Eur J Hum Genet 2011 Mar;19(3) Epub 2010 Dec 8 doi: 10.1038/ejhg.2010.199. PMID: 21150877Free PMC Article

Recent clinical studies

Etiology

Scott CA, Marsden AN, Rebagliati MR, Zhang Q, Chamling X, Searby CC, Baye LM, Sheffield VC, Slusarski DC
PLoS Genet 2017 Jul;13(7):e1006936. Epub 2017 Jul 28 doi: 10.1371/journal.pgen.1006936. PMID: 28753627Free PMC Article

Clinical prediction guides

Rödig N, Sellmann K, Dos Santos Guilherme M, Nguyen VTT, Cleppien D, Stroh A, May-Simera HL, Endres K
Int J Mol Sci 2022 Nov 22;23(23) doi: 10.3390/ijms232314506. PMID: 36498834Free PMC Article

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