rs201988564

chr5-128464739-T-Cchr5-128464739-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 3P and 1B. PM2 PP2 BP4

The NM_001999.4(FBN2):c.811A>G(p.Thr271Ala) 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 benign outcome for this variant. 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. T271P) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: FBN2 NM_001999.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.97

Genes affected

FBN2 (HGNC:3604): (fibrillin 2) The protein encoded by this gene is a component of connective tissue microfibrils and may be involved in elastic fiber assembly. Mutations in this gene cause congenital contractural arachnodactyly. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, FBN2
• BP4: Computational evidence support a benign effect (MetaRNN=0.36931306).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FBN2	NM_001999.4	c.811A>G	p.Thr271Ala	missense_variant	6/65	ENST00000262464.9
FBN2	XM_017009228.3	c.811A>G	p.Thr271Ala	missense_variant	6/64

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FBN2	ENST00000262464.9	c.811A>G	p.Thr271Ala	missense_variant	6/65	1	NM_001999.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Nov 29, 2019

Has not been previously published as pathogenic or benign to our knowledge; Not observed in large population cohorts (Lek et al., 2016); In silico analysis, which includes protein predictors and evolutionary conservation, supports a deleterious effect; Does not affect a cysteine residue within a calcium-binding EGF-like domain of the FBN2 gene; cysteine substitutions in the calcium-binding EGF-like domains represent the majority of pathogenic missense changes associated with FBN2-related disorders (Collod-Beroud et al., 2003; Frederic et al., 2009). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.43
BayesDel_addAF	Pathogenic	0.43	D
BayesDel_noAF	Uncertain	0.050
Cadd	Uncertain	24
Dann	Uncertain	1.0
DEOGEN2	Uncertain	0.64	D;.;D;T;.
Eigen	Benign	0.12
Eigen_PC	Uncertain	0.27
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.90	D;.;.;D;D
M_CAP	Benign	0.063	D
MetaRNN	Benign	0.37	T;T;T;T;T
MetaSVM	Uncertain	-0.061	T
MutationAssessor	Benign	0.43	N;.;N;.;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Pathogenic	0.82	D
PROVEAN	Uncertain	-3.5	D;.;D;D;D
REVEL	Uncertain	0.59
Sift	Uncertain	0.0090	D;.;D;D;D
Polyphen		0.23	B;.;B;B;B
Vest4		0.60
MutPred		0.52		Gain of catalytic residue at T271 (P = 0.124);.;Gain of catalytic residue at T271 (P = 0.124);.;Gain of catalytic residue at T271 (P = 0.124);
MVP		0.67
MPC		0.58
ClinPred		0.97	D
GERP RS		5.1
Varity_R		0.36
gMVP		0.35

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr5-127800432;