chr5-128393177-C-A

Position:

• chr5-128393177-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP2

The NM_001999.4(FBN2):​c.1423G>T​(p.Gly475Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G475R) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: FBN2 NM_001999.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.35

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 3 ACMG points.

• 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.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FBN2	NM_001999.4	c.1423G>T	p.Gly475Cys	missense_variant	10/65	ENST00000262464.9
FBN2	XM_017009228.3	c.1270G>T	p.Gly424Cys	missense_variant	9/64

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FBN2	ENST00000262464.9	c.1423G>T	p.Gly475Cys	missense_variant	10/65	1	NM_001999.4	P1
FBN2	ENST00000508989.5	c.1324G>T	p.Gly442Cys	missense_variant	9/33	2
FBN2	ENST00000703787.1	n.1130G>T		non_coding_transcript_exon_variant	9/10

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.48
BayesDel_addAF	Uncertain	0.11	D
BayesDel_noAF	Uncertain	-0.080
CADD	Benign	22
DANN	Uncertain	0.99
DEOGEN2	Benign	0.29	T;.;T;T
Eigen	Benign	-0.24
Eigen_PC	Benign	-0.38
FATHMM_MKL	Benign	0.34	N
LIST_S2	Benign	0.84	T;.;.;T
M_CAP	Uncertain	0.11	D
MetaRNN	Uncertain	0.70	D;D;D;D
MetaSVM	Uncertain	-0.26	T
MutationAssessor	Uncertain	2.1	M;.;M;.
MutationTaster	Benign	1.0	N;N;N
PrimateAI	Uncertain	0.73	T
PROVEAN	Benign	-1.5	N;.;N;N
REVEL	Uncertain	0.53
Sift	Benign	0.098	T;.;T;T
Sift4G	Benign	0.13	.;.;.;T
Polyphen		1.0	D;.;D;D
Vest4		0.63
MutPred		0.52		Loss of disorder (P = 0.0106);.;Loss of disorder (P = 0.0106);.;
MVP		0.65
MPC		0.85
ClinPred		0.74	D
GERP RS		3.2
Varity_R		0.085
gMVP		0.79

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: rs200440156; hg19: chr5-127728870;