Genetic Variant FBLN1:p.Ile321Ile (chr22-45541269-C-A) – ACMG Classification: Likely_benign (-3 pts)

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2BP4_StrongBP7

The NM_006486.3(FBLN1):c.963C>A(p.Ile321Ile) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,820 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as (no stars). Synonymous variant affecting the same amino acid position (i.e. I321I) has been classified as Benign.

Frequency

Genomes: not found (cov: 34)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

FBLN1
NM_006486.3 synonymous

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -2.24

Publications

21 publications found

Variant links:

Genes affected

FBLN1 (HGNC:3600): (fibulin 1) Fibulin 1 is a secreted glycoprotein that becomes incorporated into a fibrillar extracellular matrix. Calcium-binding is apparently required to mediate its binding to laminin and nidogen. It mediates platelet adhesion via binding fibrinogen. Four splice variants which differ in the 3' end have been identified. Each variant encodes a different isoform, but no functional distinctions have been identified among the four variants. [provided by RefSeq, Jul 2008]

FBLN1 Gene-Disease associations (from GenCC):

FBLN1-related developmental delay-central nervous system anomaly-syndactyly syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
synpolydactyly type 2
Inheritance: AR, Unknown Classification: LIMITED Submitted by: G2P, Labcorp Genetics (formerly Invitae)

FBLN1 links:

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ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.66).

BP7

Synonymous conserved (PhyloP=-2.24 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_006486.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
FBLN1	NM_006486.3	MANE Select	c.963C>A	p.Ile321Ile	synonymous	Exon 9 of 17	NP_006477.3
FBLN1	NM_001996.4		c.963C>A	p.Ile321Ile	synonymous	Exon 9 of 15	NP_001987.3
FBLN1	NM_006485.4		c.963C>A	p.Ile321Ile	synonymous	Exon 9 of 15	NP_006476.3

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
FBLN1	ENST00000327858.11	TSL:1 MANE Select	c.963C>A	p.Ile321Ile	synonymous	Exon 9 of 17	ENSP00000331544.6	P23142-1
FBLN1	ENST00000262722.11	TSL:1	c.963C>A	p.Ile321Ile	synonymous	Exon 9 of 15	ENSP00000262722.7	P23142-4
FBLN1	ENST00000442170.6	TSL:1	c.963C>A	p.Ile321Ile	synonymous	Exon 9 of 15	ENSP00000393812.2	P23142-3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461820

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727222

show subpopulations

African (AFR)

AF:

0.0000299

AC:

AN:

33474

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86252

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53418

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5760

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1111962

Other (OTH)

AF:

0.00

AC:

AN:

60394

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

Alfa

AF:

0.00

Hom.:

49523

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.66

CADD

Benign

0.094

(source)

DANN

Benign

0.60

PhyloP100

-2.2

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.6

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.050

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

ClinVar

Computational scores

Splicing

Publications

Other links and lift over