5-128338078-T-A

Position:

• chr5-128338078-T-A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 5P and 3B. PM1 PM2 PP2 BP4 BP6_Moderate

The NM_001999.4(FBN2):​c.3517A>T​(p.Thr1173Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★). Another nucleotide change resulting in same amino acid change has been previously reported as Likely benignin ClinVar. Synonymous variant affecting the same amino acid position (i.e. T1173T) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: FBN2 NM_001999.4 missense
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.407

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.

• PM1: In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 2 benign, 3 uncertain in NM_001999.4
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), FBN2. . Gene score misZ 1.5491 (greater than the threshold 3.09). Trascript score misZ 3.2752 (greater than threshold 3.09). GenCC has associacion of gene with familial thoracic aortic aneurysm and aortic dissection, carpal tunnel syndrome, macular degeneration, early-onset, congenital contractural arachnodactyly.
• BP4: Computational evidence support a benign effect (MetaRNN=0.30751163).
• BP6: Variant 5-128338078-T-A is Benign according to our data. Variant chr5-128338078-T-A is described in ClinVar as [Likely_benign]. Clinvar id is 547357.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FBN2	NM_001999.4	c.3517A>T	p.Thr1173Ser	missense_variant	27/65	ENST00000262464.9
FBN2	XM_017009228.3	c.3364A>T	p.Thr1122Ser	missense_variant	26/64

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FBN2	ENST00000262464.9	c.3517A>T	p.Thr1173Ser	missense_variant	27/65	1	NM_001999.4	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Connective tissue disorder Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Center for Human Genetics, Inc, Center for Human Genetics, Inc

Nov 01, 2016

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.072
BayesDel_addAF	Uncertain	0.028	T
BayesDel_noAF	Benign	-0.20
CADD	Benign	20
DANN	Uncertain	0.98
DEOGEN2	Uncertain	0.46	T;.;T;T;T
Eigen	Benign	-0.28
Eigen_PC	Benign	-0.21
FATHMM_MKL	Benign	0.40	N
LIST_S2	Benign	0.67	T;.;.;T;T
M_CAP	Benign	0.030	D
MetaRNN	Benign	0.31	T;T;T;T;T
MetaSVM	Uncertain	-0.15	T
MutationAssessor	Benign	0.55	N;.;N;.;.
MutationTaster	Benign	1.0	N;N;N;N
PrimateAI	Benign	0.48	T
PROVEAN	Benign	-2.1	N;.;N;N;N
REVEL	Uncertain	0.31
Sift	Benign	0.19	T;.;T;T;T
Sift4G	Benign	0.23	.;.;.;T;T
Polyphen		0.037	B;.;B;.;B
Vest4		0.24
MutPred		0.64		Gain of disorder (P = 0.065);.;Gain of disorder (P = 0.065);.;.;
MVP		0.46
MPC		0.30
ClinPred		0.36	T
GERP RS		4.3
Varity_R		0.085
gMVP		0.48

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs1554123061; hg19: chr5-127673770;