rs147718368

Positions:

chr20-17498964-A-G

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 1P and 7B. PP3BP4_ModerateBS1_SupportingBS2

The NM_001195.5(BFSP1):c.812T>C(p.Ile271Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000296 in 1,614,132 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00025 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00030 ( 2 hom. )

Consequence

BFSP1
NM_001195.5 missense

Scores

Clinical Significance

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

Conservation

PhyloP100: 8.63

Variant links:

Genes affected

BFSP1 (HGNC:1040): (beaded filament structural protein 1) This gene encodes a lens-specific intermediate filament-like protein named filensin. The encoded protein is expressed in lens fiber cells after differentiation has begun. This protein functions as a component of the beaded filament which is a cytoskeletal structure found in lens fiber cells. Mutations in this gene are the cause of autosomal recessive cortical juvenile-onset cataract. Alternate splicing results in multiple transcript variants. [provided by RefSeq, Jul 2013]

BFSP1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -6 ACMG points.

PP3

Multiple lines of computational evidence support a deleterious effect 7: BayesDel_addAF, BayesDel_noAF, Cadd, Eigen, phyloP100way_vertebrate, PROVEAN, REVEL [when max_spliceai, FATHMM_MKL, MetaRNN, MutationTaster was below the threshold]

BP4

Computational evidence support a benign effect (MetaRNN=0.1425493).

BS1

Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.00025 (38/152242) while in subpopulation AMR AF= 0.000392 (6/15288). AF 95% confidence interval is 0.000194. There are 0 homozygotes in gnomad4. There are 17 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High Homozygotes in GnomAdExome4 at 2 SD gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BFSP1	NM_001195.5 linkuse as main transcript	c.812T>C	p.Ile271Thr	missense_variant	6/8	ENST00000377873.8	NP_001186.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BFSP1	ENST00000377873.8 linkuse as main transcript	c.812T>C	p.Ile271Thr	missense_variant	6/8	1	NM_001195.5	ENSP00000367104	P1	Q12934-1
BFSP1	ENST00000377868.6 linkuse as main transcript	c.437T>C	p.Ile146Thr	missense_variant	6/8	1		ENSP00000367099		Q12934-2
BFSP1	ENST00000536626.7 linkuse as main transcript	c.395T>C	p.Ile132Thr	missense_variant	7/9	2		ENSP00000442522		Q12934-3

Frequencies

GnomAD3 genomes

AF:

0.000256

AC:

AN:

152124

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000393

Gnomad ASJ

AF:

0.00260

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000309

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.000422

AC:

106

AN:

251466

Hom.:

AF XY:

0.000486

AC XY:

AN XY:

135916

show subpopulations

Gnomad AFR exome

AF:

0.000123

Gnomad AMR exome

AF:

0.0000867

Gnomad ASJ exome

AF:

0.00516

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000294

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000316

Gnomad OTH exome

AF:

0.000652

GnomAD4 exome

AF:

0.000301

AC:

440

AN:

1461890

Hom.:

Cov.:

AF XY:

0.000314

AC XY:

228

AN XY:

727246

show subpopulations

Gnomad4 AFR exome

AF:

0.000179

Gnomad4 AMR exome

AF:

0.000179

Gnomad4 ASJ exome

AF:

0.00467

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000220

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000212

Gnomad4 OTH exome

AF:

0.000447

GnomAD4 genome

AF:

0.000250

AC:

AN:

152242

Hom.:

Cov.:

AF XY:

0.000228

AC XY:

AN XY:

74434

show subpopulations

Gnomad4 AFR

AF:

0.0000481

Gnomad4 AMR

AF:

0.000392

Gnomad4 ASJ

AF:

0.00260

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000294

Gnomad4 OTH

AF:

0.000473

Alfa

AF:

0.000458

Hom.:

Bravo

AF:

0.000280

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000349

AC:

ExAC

AF:

0.000362

AC:

EpiCase

AF:

0.000927

EpiControl

AF:

0.000356

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Cataract 33

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 02, 2024

This sequence change replaces isoleucine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 271 of the BFSP1 protein (p.Ile271Thr). This variant is present in population databases (rs147718368, gnomAD 0.5%). This missense change has been observed in individual(s) with congenital cataracts (PMID: 26694549). ClinVar contains an entry for this variant (Variation ID: 242475). Advanced 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 at Invitae 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 BFSP1 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. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

not provided

Breakthrough Genomics, Breakthrough Genomics

- -

BFSP1-related disorder

Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Apr 22, 2024

The BFSP1 c.812T>C variant is predicted to result in the amino acid substitution p.Ile271Thr. This variant was reported in an individual with congenital cataracts who was found to also carry a frameshift variant in the same gene, however, the phase wasn’t fully determined (Ma et al. 2016. PubMed ID: 26694549). This variant is reported in 0.50% of alleles in individuals of Ashkenazi Jewish 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

Uncertain

0.37

BayesDel_addAF

Pathogenic

0.26

BayesDel_noAF

Pathogenic

0.44

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.72

D;.;.

Eigen

Pathogenic

0.77

Eigen_PC

Pathogenic

0.72

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.91

D;D;D

M_CAP

Uncertain

0.20

MetaRNN

Benign

0.14

T;T;T

MetaSVM

Pathogenic

0.85

MutationAssessor

Uncertain

2.8

M;.;.

MutationTaster

Benign

1.0

D;D;D;D

PrimateAI

Uncertain

0.66

PROVEAN

Pathogenic

-4.5

D;D;D

REVEL

Pathogenic

0.67

Sift

Pathogenic

0.0

D;D;D

Sift4G

Uncertain

0.025

D;.;D

Polyphen

1.0

D;D;.

Vest4

0.86

MVP

0.95

MPC

0.48

ClinPred

0.20

GERP RS

6.1

Varity_R

0.65

gMVP

0.57

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