rs1553667072

Positions:

• chr2-215433372-A-G

Variant summary

Our verdict is Pathogenic. Variant got 19 ACMG points: 19P and 0B. PM1 PM2 PM5 PP2 PP3_Strong PP5_Very_Strong

The NM_212482.4(FN1):​c.367T>C​(p.Cys123Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. C123Y) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 33)
• Consequence: FN1 NM_212482.4 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:4
• Conservation: PhyloP100: 8.90

Genes affected

FN1 (HGNC:3778): (fibronectin 1) This gene encodes fibronectin, a glycoprotein present in a soluble dimeric form in plasma, and in a dimeric or multimeric form at the cell surface and in extracellular matrix. The encoded preproprotein is proteolytically processed to generate the mature protein. Fibronectin is involved in cell adhesion and migration processes including embryogenesis, wound healing, blood coagulation, host defense, and metastasis. The gene has three regions subject to alternative splicing, with the potential to produce 20 different transcript variants, at least one of which encodes an isoform that undergoes proteolytic processing. The full-length nature of some variants has not been determined. [provided by RefSeq, Jan 2016]

ACMG classification

Verdict is Pathogenic. Variant got 19 ACMG points.

• PM1: In a region_of_interest Fibrin- and heparin-binding 1 (size 220) in uniprot entity FINC_HUMAN there are 16 pathogenic changes around while only 5 benign (76%) in NM_212482.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr2-215433371-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 549708.Status of the report is no_assertion_criteria_provided, 0 stars.
• PP2: Missense variant where missense usually causes diseases, FN1
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.988
• PP5: Variant 2-215433372-A-G is Pathogenic according to our data. Variant chr2-215433372-A-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 424644.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr2-215433372-A-G is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FN1	NM_212482.4	c.367T>C	p.Cys123Arg	missense_variant	3/46	ENST00000354785.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FN1	ENST00000354785.11	c.367T>C	p.Cys123Arg	missense_variant	3/46	1	NM_212482.4	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Spondylometaphyseal dysplasia - Sutcliffe type Pathogenic:2

Likely pathogenic, criteria provided, single submitter	curation	SIB Swiss Institute of Bioinformatics	Oct 15, 2018	This variant is interpreted as Likely Pathogenic, for Spondylometaphyseal dysplasia, corner fracture type, autosomal dominant. The following ACMG Tag(s) were applied: PM6 => Assumed de novo, but without confirmation of paternity and maternity (https://www.ncbi.nlm.nih.gov/pubmed/29100092). PM2 => Absent from controls (or at extremely low frequency if recessive) in Exome Sequencing Project, 1000 Genomes Project, or Exome Aggregation Consortium. PP3 => Multiple lines of computational evidence support a deleterious effect on the gene or gene product. PM1 => Located in a mutational hot spot and/or critical and well-established functional domain (e.g., active site of an enzyme) without benign variation. Replaces a cysteine involved in disulfid (http://www.uniprot.org/uniprot/P02751). -
Pathogenic, no assertion criteria provided	literature only	OMIM	Dec 28, 2017	- -

Spondylometaphyseal dysplasia Pathogenic:1

Likely pathogenic, no assertion criteria provided

research

CHU Sainte-Justine Research Center, University of Montreal

Feb 25, 2017

6 Individuals with novel FN1 mutations and spondylometaphyseal dysplasia -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Invitae

Jul 01, 2022

For these reasons, this variant has been classified as Pathogenic. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Not Available"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Not Available"). ClinVar contains an entry for this variant (Variation ID: 424644). This missense change has been observed in individual(s) with spondylometaphyseal dysplasia, 'corner fracture' type (PMID: 29100092). In at least one individual the variant was observed to be de novo. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces cysteine, which is neutral and slightly polar, with arginine, which is basic and polar, at codon 123 of the FN1 protein (p.Cys123Arg). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.51	D
BayesDel_noAF	Pathogenic	0.50
CADD	Pathogenic	29
DANN	Uncertain	1.0
Eigen	Pathogenic	0.86
Eigen_PC	Pathogenic	0.86
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.89	D;D;D;D;D;D;D;D;D;D;D
M_CAP	Pathogenic	0.58	D
MetaRNN	Pathogenic	0.99	D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Uncertain	2.2	M;M;M;M;M;M;M;M;M;M;M
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D;D;D;D;D;D
PrimateAI	Pathogenic	0.90	D
PROVEAN	Pathogenic	-5.0	D;D;D;D;D;D;D;D;D;D;D
REVEL	Pathogenic	0.92
Sift	Uncertain	0.0010	D;D;D;D;D;D;D;D;D;D;D
Sift4G	Pathogenic	0.0	D;D;D;D;D;D;D;D;D;D;D
Polyphen		1.0	D;D;D;P;D;.;.;D;D;D;.
Vest4		0.91
MutPred		0.96		Gain of MoRF binding (P = 0.0026);Gain of MoRF binding (P = 0.0026);Gain of MoRF binding (P = 0.0026);Gain of MoRF binding (P = 0.0026);Gain of MoRF binding (P = 0.0026);Gain of MoRF binding (P = 0.0026);Gain of MoRF binding (P = 0.0026);Gain of MoRF binding (P = 0.0026);Gain of MoRF binding (P = 0.0026);Gain of MoRF binding (P = 0.0026);Gain of MoRF binding (P = 0.0026);
MVP		1.0
MPC		1.2
ClinPred		1.0	D
GERP RS		6.1
Varity_R		0.95
gMVP		0.98

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: rs1553667072; hg19: chr2-216298095;