20-17494129-G-A

Variant names:

• chr20-17494129-G-A
• rs752902567
• NM_001195.5:c.1943C>T

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001195.5(BFSP1):​c.1943C>T​(p.Thr648Ile) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,461,788 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. T648A) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: BFSP1 NM_001195.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.34
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• cataract 33

  Inheritance: AR, AD, SD Classification: STRONG, MODERATE, LIMITED Submitted by: G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics
• early-onset nuclear cataract

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001195.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	BFSP1	NM_001195.5	MANE Select	c.1943C>T	p.Thr648Ile	missense	Exon 8 of 8	NP_001186.1	Q12934-1
	BFSP1	NM_001424338.1		c.1835C>T	p.Thr612Ile	missense	Exon 7 of 7	NP_001411267.1
	BFSP1	NM_001278607.2		c.1610C>T	p.Thr537Ile	missense	Exon 8 of 8	NP_001265536.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	BFSP1	ENST00000377873.8	TSL:1 MANE Select	c.1943C>T	p.Thr648Ile	missense	Exon 8 of 8	ENSP00000367104.3	Q12934-1
	BFSP1	ENST00000377868.6	TSL:1	c.1568C>T	p.Thr523Ile	missense	Exon 8 of 8	ENSP00000367099.2	Q12934-2
	BFSP1	ENST00000929672.1		c.1835C>T	p.Thr612Ile	missense	Exon 7 of 7	ENSP00000599731.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.0000159 AC: 4 AN: 251314 AF XY: 0.0000147

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000116

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461788 Hom.: 0 Cov.: 31 AF XY: 0.00000275 AC XY: 2 AN XY: 727188

African (AFR) AF: 0.00 AC: 0 AN: 33476

American (AMR) AF: 0.0000895 AC: 4 AN: 44716

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26134

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86224

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53390

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111990

Other (OTH) AF: 0.00 AC: 0 AN: 60390

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000329 Hom.: 0

Bravo AF: 0.00000756

ExAC AF: 0.0000247 AC: 3

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Cataract 33 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.83
BayesDel_addAF	Uncertain	0.098	D
BayesDel_noAF	Uncertain	0.13
CADD	Uncertain	25
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.66	D
Eigen	Pathogenic	0.79
Eigen_PC	Pathogenic	0.74
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Benign	0.85	T
M_CAP	Uncertain	0.19	D
MetaRNN	Uncertain	0.57	D
MetaSVM	Uncertain	-0.057	T
MutationAssessor	Uncertain	2.5	M
PhyloP100		7.3
PrimateAI	Uncertain	0.62	T
PROVEAN	Uncertain	-3.2	D
REVEL	Uncertain	0.48
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.51
MVP		0.89
MPC		0.44
ClinPred		0.96	D
GERP RS		5.0
Varity_R		0.60
gMVP		0.61
Mutation Taster		=21/79	disease causing

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

Other links and lift over

dbSNP: rs752902567; hg19: chr20-17474774;