Genetic Variant NM_031885.5:c.1422G>A (chr16-56499883-C-T) – ACMG Classification: Benign (-11 pts)

Variant summary

Our verdict is Benign. The variant received -11 ACMG points: 0P and 11B. BP4BP6BP7BS1BS2

The NM_031885.5(BBS2):c.1422G>A(p.Ser474Ser) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00338 in 1,613,978 control chromosomes in the GnomAD database, including 11 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. S474S) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0024 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0035 ( 11 hom. )

Consequence

BBS2
NM_031885.5 synonymous

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:11

Conservation

PhyloP100: 2.13

Publications

4 publications found

Variant links:

COSMIC-nc: COSV104392646

Genes affected

BBS2 (HGNC:967): (Bardet-Biedl syndrome 2) This gene is a member of the Bardet-Biedl syndrome (BBS) gene family. Bardet-Biedl syndrome is an autosomal recessive disorder characterized by severe pigmentary retinopathy, obesity, polydactyly, renal malformation and cognitive disability. The proteins encoded by BBS gene family members are structurally diverse and the similar phenotypes exhibited by mutations in BBS gene family members is likely due to their shared roles in cilia formation and function. Many BBS proteins localize to the basal bodies, ciliary axonemes, and pericentriolar regions of cells. BBS proteins may also be involved in intracellular trafficking via microtubule-related transport. The protein encoded by this gene forms a multiprotein BBSome complex with seven other BBS proteins.[provided by RefSeq, Oct 2014]

BBS2 Gene-Disease associations (from GenCC):

Bardet-Biedl syndrome 2
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, G2P, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Myriad Women’s Health
BBS2-related ciliopathy
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
retinitis pigmentosa 74
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
retinitis pigmentosa
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
Bardet-Biedl syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

BBS2 links:

ENSG00000288725 (HGNC:):

ENSG00000288725 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -11 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.15).

BP6

Variant 16-56499883-C-T is Benign according to our data. Variant chr16-56499883-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 194124.

BP7

Synonymous conserved (PhyloP=2.13 with no splicing effect.

BS1

Variant frequency is greater than expected in population amr. GnomAd4 allele frequency = 0.0024 (366/152214) while in subpopulation AMR AF = 0.00576 (88/15288). AF 95% confidence interval is 0.00479. There are 0 homozygotes in GnomAd4. There are 185 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAdExome4 at 11 AD,AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_031885.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
BBS2	NM_031885.5	MANE Select	c.1422G>A	p.Ser474Ser	synonymous	Exon 12 of 17	NP_114091.4
BBS2	NM_001377456.1		c.1422G>A	p.Ser474Ser	synonymous	Exon 12 of 18	NP_001364385.1	Q9BXC9
BBS2	NR_165293.1		n.1584G>A		non_coding_transcript_exon	Exon 12 of 17

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
BBS2	ENST00000245157.11	TSL:1 MANE Select	c.1422G>A	p.Ser474Ser	synonymous	Exon 12 of 17	ENSP00000245157.5	Q9BXC9
BBS2	ENST00000565781.6	TSL:1	n.3744G>A		non_coding_transcript_exon	Exon 8 of 12
ENSG00000288725	ENST00000684388.1		n.342G>A		non_coding_transcript_exon	Exon 3 of 14	ENSP00000507647.1	A0A804HJU2

Frequencies

GnomAD3 genomes

AF:

0.00241

AC:

366

AN:

152096

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000580

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00576

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00104

Gnomad FIN

AF:

0.00113

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00344

Gnomad OTH

AF:

0.00143

GnomAD2 exomes

AF:

0.00221

AC:

557

AN:

251468

AF XY:

0.00237

show subpopulations

Gnomad AFR exome

AF:

0.000431

Gnomad AMR exome

AF:

0.00205

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000109

Gnomad FIN exome

AF:

0.000554

Gnomad NFE exome

AF:

0.00375

Gnomad OTH exome

AF:

0.00163

GnomAD4 exome

AF:

0.00348

AC:

5089

AN:

1461764

Hom.:

Cov.:

AF XY:

0.00347

AC XY:

2521

AN XY:

727192

show subpopulations

African (AFR)

AF:

0.000358

AC:

AN:

33478

American (AMR)

AF:

0.00201

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26130

East Asian (EAS)

AF:

0.0000756

AC:

AN:

39688

South Asian (SAS)

AF:

0.000997

AC:

AN:

86240

European-Finnish (FIN)

AF:

0.000580

AC:

AN:

53406

Middle Eastern (MID)

AF:

0.000347

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00422

AC:

4690

AN:

1111944

Other (OTH)

AF:

0.00290

AC:

175

AN:

60386

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.472

Heterozygous variant carriers

271

542

813

1084

1355

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

210

420

630

840

1050

<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:

0.00240

AC:

366

AN:

152214

Hom.:

Cov.:

AF XY:

0.00249

AC XY:

185

AN XY:

74422

show subpopulations

African (AFR)

AF:

0.000578

AC:

AN:

41510

American (AMR)

AF:

0.00576

AC:

AN:

15288

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5184

South Asian (SAS)

AF:

0.00104

AC:

AN:

4822

European-Finnish (FIN)

AF:

0.00113

AC:

AN:

10596

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00344

AC:

234

AN:

68024

Other (OTH)

AF:

0.00142

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:

0.00258

Hom.:

Bravo

AF:

0.00233

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.00360

EpiControl

AF:

0.00338

ClinVar

ClinVar submissions

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

not specified (5)

Bardet-Biedl syndrome 2 (3)

Bardet-Biedl syndrome 1 (2)

Bardet-Biedl syndrome (1)

not provided (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.15

CADD

Benign

(source)

DANN

Benign

0.72

PhyloP100

2.1

Mutation Taster

=100/0

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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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over