20-17494196-C-G

Variant names:

• chr20-17494196-C-G
• rs374664442
• NM_001195.5:c.1876G>C

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_001195.5(BFSP1):​c.1876G>C​(p.Glu626Gln) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,828 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: BFSP1 NM_001195.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.25

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.39806587).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
BFSP1	NM_001195.5	c.1876G>C	p.Glu626Gln	missense_variant	Exon 8 of 8	ENST00000377873.8	NP_001186.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
BFSP1	ENST00000377873.8	c.1876G>C	p.Glu626Gln	missense_variant	Exon 8 of 8	1	NM_001195.5	ENSP00000367104.3
BFSP1	ENST00000377868.6	c.1501G>C	p.Glu501Gln	missense_variant	Exon 8 of 8	1		ENSP00000367099.2
BFSP1	ENST00000536626.7	c.1459G>C	p.Glu487Gln	missense_variant	Exon 9 of 9	2		ENSP00000442522.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461828 Hom.: 0 Cov.: 67 AF XY: 0.00000138 AC XY: 1 AN XY: 727216

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.47
BayesDel_addAF	Uncertain	0.12	D
BayesDel_noAF	Uncertain	-0.070
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Benign	0.33	T;.;.
Eigen	Pathogenic	0.71
Eigen_PC	Uncertain	0.63
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.88	D;D;D
M_CAP	Uncertain	0.088	D
MetaRNN	Benign	0.40	T;T;T
MetaSVM	Uncertain	-0.057	T
MutationAssessor	Uncertain	2.5	M;.;.
PrimateAI	Uncertain	0.53	T
PROVEAN	Benign	-1.7	N;D;D
REVEL	Uncertain	0.36
Sift	Pathogenic	0.0	D;D;D
Sift4G	Pathogenic	0.0	D;.;D
Polyphen		1.0	D;D;.
Vest4		0.45
MutPred		0.48		Loss of disorder (P = 0.1042);.;.;
MVP		0.74
MPC		0.43
ClinPred		0.98	D
GERP RS		5.0
Varity_R		0.46
gMVP		0.44

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

Other links and lift over

dbSNP: rs374664442; hg19: chr20-17474841;