rs773588060

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 0P and 2B. BP4_Moderate

The NM_024649.5(BBS1):c.726G>A(p.Met242Ile) variant causes a missense, splice region change. The variant allele was found at a frequency of 0.0000112 in 1,613,716 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 1/1 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. M242T) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000026 ( 1 hom., cov: 32)

Exomes 𝑓: 0.0000096 ( 0 hom. )

Consequence

BBS1
NM_024649.5 missense, splice_region

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:5

Conservation

PhyloP100: 6.69

Publications

1 publications found

Variant links:

Genes affected

BBS1 (HGNC:966): (Bardet-Biedl syndrome 1) Mutations in this gene have been observed in patients with the major form (type 1) of Bardet-Biedl syndrome. The encoded protein may play a role in eye, limb, cardiac and reproductive system development. [provided by RefSeq, Jul 2008]

BBS1 links:

ENSG00000256349 (HGNC:):

ENSG00000256349 links:

ZDHHC24 (HGNC:27387): (zinc finger DHHC-type containing 24) Predicted to enable protein-cysteine S-palmitoyltransferase activity. Predicted to be involved in peptidyl-L-cysteine S-palmitoylation and protein targeting to membrane. Predicted to be integral component of membrane. Predicted to be active in Golgi apparatus and endoplasmic reticulum. [provided by Alliance of Genome Resources, Apr 2022]

ZDHHC24 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.22102234).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BBS1	NM_024649.5 link	c.726G>A	p.Met242Ile	missense_variant, splice_region_variant	Exon 9 of 17	ENST00000318312.12	NP_078925.3	Q8NFJ9-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BBS1	ENST00000318312.12 link	c.726G>A	p.Met242Ile	missense_variant, splice_region_variant	Exon 9 of 17	1	NM_024649.5	ENSP00000317469.7		Q8NFJ9-1
ENSG00000256349	ENST00000419755.3 link	c.837G>A	p.Met279Ile	missense_variant, splice_region_variant	Exon 9 of 17	2		ENSP00000398526.3

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152230

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000262

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000477

AC:

AN:

251464

AF XY:

0.0000294

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000231

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000879

Gnomad OTH exome

AF:

0.000489

GnomAD4 exome

AF:

0.00000958

AC:

AN:

1461486

Hom.:

Cov.:

AF XY:

0.00000688

AC XY:

AN XY:

727050

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33472

American (AMR)

AF:

0.000291

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26132

East Asian (EAS)

AF:

0.00

AC:

AN:

39698

South Asian (SAS)

AF:

0.00

AC:

AN:

86244

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53412

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5750

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1111690

Other (OTH)

AF:

0.0000166

AC:

AN:

60366

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.0000263

AC:

AN:

152230

Hom.:

Cov.:

AF XY:

0.0000403

AC XY:

AN XY:

74366

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41468

American (AMR)

AF:

0.000262

AC:

AN:

15268

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:

4836

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10616

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68050

Other (OTH)

AF:

0.00

AC:

AN:

2092

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.0000453

ExAC

AF:

0.00000824

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Bardet-Biedl syndrome 1

Uncertain:2

Apr 10, 2024

Fulgent Genetics, Fulgent Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Sep 16, 2020

Natera, Inc.

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

not provided

Uncertain:1

Oct 14, 2015

Eurofins Ntd Llc (ga)

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

BBS1-related disorder

Uncertain:1

May 12, 2024

PreventionGenetics, part of Exact Sciences

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:clinical testing

The BBS1 c.726G>A variant is predicted to result in the amino acid substitution p.Met242Ile. To our knowledge, this variant has not been reported in the literature. This variant is reported in 0.028% of alleles in individuals of Latino descent in gnomAD, including one homozygous individual. At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Bardet-Biedl syndrome

Uncertain:1

Oct 26, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces methionine, which is neutral and non-polar, with isoleucine, which is neutral and non-polar, at codon 242 of the BBS1 protein (p.Met242Ile). This variant is present in population databases (rs773588060, gnomAD 0.03%), including at least one homozygous and/or hemizygous individual. This variant has not been reported in the literature in individuals affected with BBS1-related conditions. ClinVar contains an entry for this variant (Variation ID: 283883). 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) has been performed for this missense variant. However, the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on BBS1 protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.38

BayesDel_addAF

Benign

0.0035

BayesDel_noAF

Uncertain

0.060

CADD

Benign

(source)

DANN

Uncertain

0.98

DEOGEN2

Uncertain

0.44

.;T;.;T

Eigen

Benign

0.17

Eigen_PC

Uncertain

0.34

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Benign

0.76

T;T;T;T

M_CAP

Benign

0.074

MetaRNN

Benign

0.22

T;T;T;T

MetaSVM

Uncertain

-0.18

MutationAssessor

Benign

1.3

.;L;.;.

PhyloP100

6.7

PrimateAI

Uncertain

0.56

PROVEAN

Benign

-1.1

N;N;N;N

REVEL

Uncertain

0.40

Sift

Benign

0.36

T;T;T;T

Sift4G

Benign

0.39

T;T;T;T

Polyphen

0.46, 0.63

.;P;.;P

Vest4

0.70

MutPred

0.38

.;Loss of helix (P = 0.0104);.;.;

MVP

0.93

MPC

0.17

ClinPred

0.11

GERP RS

5.7

Varity_R

0.20

gMVP

0.44

Mutation Taster

=73/27

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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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rs773588060

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