chr4-121847473-T-C

Variant names:

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 9P and 1B. PP2PP5_Very_StrongBP4

The NM_176824.3(BBS7):c.968A>G(p.His323Arg) variant causes a missense change. The variant allele was found at a frequency of 0.0000583 in 1,613,656 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★).

Frequency

Genomes: 𝑓 0.000092 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000055 ( 0 hom. )

Consequence

BBS7
NM_176824.3 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:10

Conservation

PhyloP100: 6.84

Publications

9 publications found

Variant links:

Genes affected

BBS7 (HGNC:18758): (Bardet-Biedl syndrome 7) 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]

BBS7 Gene-Disease associations (from GenCC):

Bardet-Biedl syndrome 7
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae), Genomics England PanelApp
ciliopathy
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
Bardet-Biedl syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

BBS7 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_pathogenic. The variant received 8 ACMG points.

PP2

Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 11 curated pathogenic missense variants (we use a threshold of 10). The gene has 1 curated benign missense variants. Gene score misZ: 1.2326 (below the threshold of 3.09). Trascript score misZ: 1.7868 (below the threshold of 3.09). GenCC associations: The gene is linked to ciliopathy, Bardet-Biedl syndrome 7, Bardet-Biedl syndrome.

PP5

Variant 4-121847473-T-C is Pathogenic according to our data. Variant chr4-121847473-T-C is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 3015.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP4

Computational evidence support a benign effect (MetaRNN=0.20648062). . Strength limited to SUPPORTING due to the PP5.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BBS7	NM_176824.3 link	c.968A>G	p.His323Arg	missense_variant	Exon 10 of 19	ENST00000264499.9	NP_789794.1	Q8IWZ6-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BBS7	ENST00000264499.9 link	c.968A>G	p.His323Arg	missense_variant	Exon 10 of 19	1	NM_176824.3	ENSP00000264499.4		Q8IWZ6-1
BBS7	ENST00000506636.1 link	c.968A>G	p.His323Arg	missense_variant	Exon 10 of 18	1		ENSP00000423626.1		Q8IWZ6-2

Frequencies

GnomAD3 genomes

AF:

0.0000920

AC:

AN:

152236

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000482

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000176

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000279

AC:

AN:

251292

AF XY:

0.0000147

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000616

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000547

AC:

AN:

1461420

Hom.:

Cov.:

AF XY:

0.0000426

AC XY:

AN XY:

727038

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33468

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26126

East Asian (EAS)

AF:

0.00

AC:

AN:

39648

South Asian (SAS)

AF:

0.00

AC:

AN:

86252

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53322

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

0.0000702

AC:

AN:

1111732

Other (OTH)

AF:

0.0000331

AC:

AN:

60384

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.451

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000920

AC:

AN:

152236

Hom.:

Cov.:

AF XY:

0.000108

AC XY:

AN XY:

74374

show subpopulations

African (AFR)

AF:

0.0000482

AC:

AN:

41466

American (AMR)

AF:

0.00

AC:

AN:

15282

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5200

South Asian (SAS)

AF:

0.00

AC:

AN:

4834

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10628

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.000176

AC:

AN:

68032

Other (OTH)

AF:

0.00

AC:

AN:

2094

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.479

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000955

Hom.:

Bravo

AF:

0.0000378

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:10

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Bardet-Biedl syndrome 7

Pathogenic:3

Mar 01, 2003

OMIM

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

Mar 17, 2024

Baylor Genetics

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Feb 07, 2024

Fulgent Genetics, Fulgent Genetics

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not provided

Pathogenic:3

Oct 23, 2020

Institute of Medical Genetics and Applied Genomics, University Hospital Tübingen

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jul 30, 2025

GeneDx

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Published functional studies demonstrate H323R impacts the rate of BBS7 nuclear export through a dominant negative mechanism (PMID: 22302990, 20498079); In silico analysis supports that this missense variant does not alter protein structure/function; This variant is associated with the following publications: (PMID: 20498079, 31589614, 31939736, 22302990, 32783370, 37734845, 12567324, 35886001, 32531858, 31964843) -

Apr 01, 2018

CeGaT Center for Human Genetics Tuebingen

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Bardet-Biedl syndrome

Pathogenic:2

Nov 21, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces histidine, which is basic and polar, with arginine, which is basic and polar, at codon 323 of the BBS7 protein (p.His323Arg). This variant is present in population databases (rs119466001, gnomAD 0.008%). This missense change has been observed in individuals with Bardet-Biedl syndrome (PMID: 12567324, 32531858). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 3015). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt BBS7 protein function with a negative predictive value of 80%. Experimental studies have shown that this missense change affects BBS7 function (PMID: 20498079, 22302990). For these reasons, this variant has been classified as Pathogenic. -

May 06, 2025

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: BBS7 c.968A>G (p.His323Arg) results in a non-conservative amino acid change in the encoded protein sequence. Algorithms developed to predict the effect of missense changes on protein structure and function all suggest that this variant is likely to be disruptive. The variant allele was found at a frequency of 2.8e-05 in 251292 control chromosomes. c.968A>G has been observed in multiple homozygous individuals affected with Bardet-Biedl Syndrome (Badano_2003). These data indicate that the variant is very likely to be associated with disease. At least one publication reports experimental evidence evaluating an impact on protein function, and the results show that this variant has a dominant negative effect on normal protein function (Zaghloul_2010). The following publications have been ascertained in the context of this evaluation (PMID: 12567324, 20498079). ClinVar contains an entry for this variant (Variation ID: 3015). Based on the evidence outlined above, the variant was classified as pathogenic. -

BBS7-related disorder

Pathogenic:1

Aug 27, 2024

PreventionGenetics, part of Exact Sciences

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

The BBS7 c.968A>G variant is predicted to result in the amino acid substitution p.His323Arg. This variant has been found in the homozygous state in three individuals with Bardet-Biedl syndrome from two families (Badano et al. 2003. PubMed ID: 12567324). Functional studies indicate this variant disrupts BBS7 function (Zaghloul et al. 2010. PubMed ID: 20498079; Gascue et al. 2012. PubMed ID: 22302990). This variant is reported in 0.0080% of alleles in individuals of African descent in gnomAD. This variant is interpreted as pathogenic. -

Retinal dystrophy

Pathogenic:1

Jan 01, 2010

Institute of Human Genetics, Univ. Regensburg, Univ. Regensburg

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.065

BayesDel_addAF

Uncertain

0.15

BayesDel_noAF

Pathogenic

0.16

CADD

Benign

(source)

DANN

Uncertain

0.98

DEOGEN2

Benign

0.13

T;.

Eigen

Benign

-0.015

Eigen_PC

Benign

0.19

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Benign

0.76

T;T

M_CAP

Benign

0.050

MetaRNN

Benign

0.21

T;T

MetaSVM

Uncertain

0.32

MutationAssessor

Uncertain

2.2

M;M

PhyloP100

6.8

PrimateAI

Uncertain

0.50

PROVEAN

Benign

-0.72

N;N

REVEL

Uncertain

0.47

Sift

Benign

0.44

T;T

Sift4G

Benign

0.49

T;T

Polyphen

0.031

B;.

Vest4

0.22

MVP

0.97

MPC

0.21

ClinPred

0.22

GERP RS

5.8

Varity_R

0.12

gMVP

0.21

Mutation Taster

=17/83

disease causing (ClinVar)

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.050

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over