NM_152384.3:c.751A>G

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 1P and 7B.

-6

PP2BP4_ModerateBS1_SupportingBS2

The NM_152384.3(BBS5):c.751A>G(p.Asn251Asp) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00125 in 1,613,550 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. N251S) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00089 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0013 ( 3 hom. )

Consequence

BBS5
NM_152384.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:4B:2

Conservation

PhyloP100: 7.26

Publications

3 publications found

Variant links:

Genes affected

BBS5 (HGNC:970): (Bardet-Biedl syndrome 5) This gene encodes a protein that has been directly linked to Bardet-Biedl syndrome. The primary features of this syndrome include retinal dystrophy, obesity, polydactyly, renal abnormalities and learning disabilities. Experimentation in non-human eukaryotes suggests that this gene is expressed in ciliated cells and that it is required for the formation of cilia. Alternate transcriptional splice variants have been observed but have not been fully characterized. [provided by RefSeq, Jul 2008]

BBS5 Gene-Disease associations (from GenCC):

Bardet-Biedl syndrome 5
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Genomics England PanelApp, Ambry Genetics, Laboratory for Molecular Medicine, Labcorp Genetics (formerly Invitae)
Bardet-Biedl syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

BBS5 links:

ENSG00000251569 (HGNC:):

ENSG00000251569 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -6 ACMG points.

PP2

Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 7 curated pathogenic missense variants (we use a threshold of 10). The gene has 1 curated benign missense variants. Gene score misZ: 0.85025 (below the threshold of 3.09). Trascript score misZ: 1.0056 (below the threshold of 3.09). GenCC associations: The gene is linked to Bardet-Biedl syndrome 5, Bardet-Biedl syndrome.

BP4

Computational evidence support a benign effect (MetaRNN=0.14964968).

BS1

Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.000886 (135/152344) while in subpopulation SAS AF = 0.00186 (9/4826). AF 95% confidence interval is 0.00124. There are 0 homozygotes in GnomAd4. There are 57 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High Homozygotes in GnomAdExome4 at 3 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BBS5	NM_152384.3 link	c.751A>G	p.Asn251Asp	missense_variant	Exon 9 of 12	ENST00000295240.8	NP_689597.1	Q8N3I7-1A0A0S2Z626

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
BBS5	ENST00000295240.8 link	c.751A>G	p.Asn251Asp	missense_variant	Exon 9 of 12	1	NM_152384.3	ENSP00000295240.3	Q8N3I7-1
ENSG00000251569	ENST00000513963.1 link	c.751A>G	p.Asn251Asp	missense_variant	Exon 9 of 16	2		ENSP00000424363.1	E9PBE3
BBS5	ENST00000392663.6 link	c.688A>G	p.Asn230Asp	missense_variant	Exon 8 of 11	1		ENSP00000376431.2	Q8N3I7-2
BBS5	ENST00000472667.1 link	n.522A>G		non_coding_transcript_exon_variant	Exon 1 of 4	2

Frequencies

GnomAD3 genomes

AF:

0.000887

AC:

135

AN:

152226

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000362

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000654

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00186

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00316

Gnomad NFE

AF:

0.00147

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00107

AC:

268

AN:

251380

AF XY:

0.00107

show subpopulations

Gnomad AFR exome

AF:

0.000308

Gnomad AMR exome

AF:

0.00121

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.000139

Gnomad NFE exome

AF:

0.00151

Gnomad OTH exome

AF:

0.00147

GnomAD4 exome

AF:

0.00129

AC:

1885

AN:

1461206

Hom.:

Cov.:

AF XY:

0.00128

AC XY:

933

AN XY:

726978

show subpopulations

African (AFR)

AF:

0.000209

AC:

AN:

33464

American (AMR)

AF:

0.00116

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26128

East Asian (EAS)

AF:

0.00

AC:

AN:

39656

South Asian (SAS)

AF:

0.00137

AC:

118

AN:

86236

European-Finnish (FIN)

AF:

0.000187

AC:

AN:

53414

Middle Eastern (MID)

AF:

0.00191

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

0.00144

AC:

1600

AN:

1111454

Other (OTH)

AF:

0.00144

AC:

AN:

60366

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.501

Heterozygous variant carriers

183

275

366

458

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

116

174

232

290

<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:

0.000886

AC:

135

AN:

152344

Hom.:

Cov.:

AF XY:

0.000765

AC XY:

AN XY:

74496

show subpopulations

African (AFR)

AF:

0.000361

AC:

AN:

41574

American (AMR)

AF:

0.000653

AC:

AN:

15306

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5182

South Asian (SAS)

AF:

0.00186

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10626

Middle Eastern (MID)

AF:

0.00340

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00147

AC:

100

AN:

68038

Other (OTH)

AF:

0.00

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.510

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:

0.00133

Hom.:

Bravo

AF:

0.000892

TwinsUK

AF:

0.000809

AC:

ALSPAC

AF:

0.000778

AC:

ESP6500AA

AF:

0.000681

AC:

ESP6500EA

AF:

0.00105

AC:

ExAC

AF:

0.00116

AC:

141

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:4Benign:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Mar 13, 2019

Genetic Services Laboratory, University of Chicago

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not provided

Uncertain:1

Nov 01, 2019

CeGaT Center for Human Genetics Tuebingen

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Bardet-Biedl syndrome 5

Uncertain:1

Oct 31, 2018

Fulgent Genetics, Fulgent Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Bardet-Biedl syndrome

Uncertain:1

Jan 21, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces asparagine, which is neutral and polar, with aspartic acid, which is acidic and polar, at codon 251 of the BBS5 protein (p.Asn251Asp). This variant is present in population databases (rs143113298, gnomAD 0.2%), and has an allele count higher than expected for a pathogenic variant. This missense change has been observed in individual(s) with Bardet-Biedl syndrome (PMID: 22626039). ClinVar contains an entry for this variant (Variation ID: 412295). 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 BBS5 protein function with a negative predictive value of 80%. 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. -

BBS5-related disorder

Benign:1

Nov 29, 2023

PreventionGenetics, part of Exact Sciences

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Intellectual disability

Benign:1

Mar 30, 2020

Cambridge Genomics Laboratory, East Genomic Laboratory Hub, NHS Genomic Medicine Service

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.17

BayesDel_addAF

Benign

-0.29

BayesDel_noAF

Benign

-0.21

CADD

Benign

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.18

T;.;.

Eigen

Uncertain

0.22

Eigen_PC

Uncertain

0.36

FATHMM_MKL

Uncertain

0.96

LIST_S2

Uncertain

0.96

D;D;D

M_CAP

Benign

0.038

MetaRNN

Benign

0.15

T;T;T

MetaSVM

Benign

-0.54

MutationAssessor

Benign

1.2

L;.;.

PhyloP100

7.3

PROVEAN

Benign

-0.86

N;N;N

REVEL

Uncertain

0.30

Sift

Benign

0.62

T;T;T

Sift4G

Benign

0.62

T;T;T

Polyphen

0.68

P;P;.

Vest4

0.87

MVP

0.84

MPC

1.2

ClinPred

0.022

GERP RS

5.7

Varity_R

0.33

gMVP

0.55

Mutation Taster

=57/43

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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