10-110900376-C-T

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_001195305.3(BBIP1):c.263G>A(p.Arg88Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000326 in 1,534,418 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/17 in silico tools predict a benign outcome for this variant. 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. R88W) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000033 ( 0 hom. )

Consequence

BBIP1
NM_001195305.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: -3.00

Variant links:

Genes affected

BBIP1 (HGNC:28093): (BBSome interacting protein 1) This gene encodes one of eight proteins that form the BBSome complex and is essential for its assembly. The BBSome complex is involved in trafficking signal receptors to and from the cilia. Mutations in this gene result in Bardet-Biedl syndrome 18. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Oct 2014]

BBIP1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.022710055).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BBIP1	NM_001195305.3 link	c.263G>A	p.Arg88Gln	missense_variant	Exon 4 of 4	ENST00000448814.7	NP_001182234.1	A8MTZ0-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BBIP1	ENST00000448814.7 link	c.263G>A	p.Arg88Gln	missense_variant	Exon 4 of 4	1	NM_001195305.3	ENSP00000436622.2		A8MTZ0-1

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152134

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

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:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000431

AC:

AN:

139066

Hom.:

AF XY:

0.0000265

AC XY:

AN XY:

75416

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000411

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000894

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000333

AC:

AN:

1382284

Hom.:

Cov.:

AF XY:

0.0000366

AC XY:

AN XY:

682156

show subpopulations

Gnomad4 AFR exome

AF:

0.0000317

Gnomad4 AMR exome

AF:

0.000140

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000280

Gnomad4 SAS exome

AF:

0.0000253

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000334

Gnomad4 OTH exome

AF:

0.0000173

GnomAD4 genome

AF:

0.0000263

AC:

AN:

152134

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74316

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000142

Hom.:

Bravo

AF:

0.0000302

TwinsUK

AF:

0.000539

AC:

ALSPAC

AF:

0.000259

AC:

ExAC

AF:

0.0000546

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Bardet-Biedl syndrome 18

Uncertain:1

May 02, 2022

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided

Uncertain:1

Dec 12, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 88 of the BBIP1 protein (p.Arg88Gln). This variant is present in population databases (rs781040735, gnomAD 0.009%). This variant has not been reported in the literature in individuals affected with BBIP1-related conditions. ClinVar contains an entry for this variant (Variation ID: 1044270). An algorithm developed to predict the effect of missense changes on protein structure and function outputs the following: PolyPhen-2: "Benign". The glutamine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect 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. -

BBIP1-related disorder

Uncertain:1

May 10, 2024

PreventionGenetics, part of Exact Sciences

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

The BBIP1 c.263G>A variant is predicted to result in the amino acid substitution p.Arg88Gln. To our knowledge, this variant has not been reported in the literature. This variant is reported in 0.0084% of alleles in individuals of European (Non-Finnish) descent in gnomAD. At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.055

BayesDel_addAF

Benign

-0.45

BayesDel_noAF

Benign

-0.68

CADD

Benign

0.024

DANN

Benign

0.89

DEOGEN2

Benign

0.033

T;.;.;T;.

Eigen

Benign

-1.1

Eigen_PC

Benign

-1.3

FATHMM_MKL

Benign

0.037

LIST_S2

Benign

0.50

.;.;T;T;T

M_CAP

Benign

0.00067

MetaRNN

Benign

0.023

T;T;T;T;T

MetaSVM

Benign

-1.0

PrimateAI

Benign

0.18

PROVEAN

Benign

-0.12

N;N;N;.;N

REVEL

Benign

0.011

Sift

Benign

0.53

T;T;T;.;T

Sift4G

Benign

0.23

T;T;T;T;T

Vest4

0.061

MutPred

0.17

Loss of MoRF binding (P = 0.001);.;.;Loss of MoRF binding (P = 0.001);.;

MVP

0.014

ClinPred

0.026

GERP RS

-5.1

Varity_R

0.016

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over