5-128328706-T-G

Variant names:

• chr5-128328706-T-G
• rs797045573
• NM_001999.4:c.4461A>C

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001999.4(FBN2):​c.4461A>C​(p.Arg1487Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,818 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar. Synonymous variant affecting the same amino acid position (i.e. R1487R) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: FBN2 NM_001999.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.566
• Publications: 0 publications found

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]

FBN2 Gene-Disease associations (from GenCC):

• congenital contractural arachnodactyly

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Labcorp Genetics (formerly Invitae), Genomics England PanelApp, PanelApp Australia, Orphanet
• carpal tunnel syndrome

  Inheritance: AD Classification: LIMITED Submitted by: Franklin by Genoox
• macular degeneration, early-onset

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• familial thoracic aortic aneurysm and aortic dissection

  Inheritance: Unknown Classification: LIMITED Submitted by: ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.17930329).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001999.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	FBN2	NM_001999.4	MANE Select	c.4461A>C	p.Arg1487Ser	missense	Exon 34 of 65	NP_001990.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	FBN2	ENST00000262464.9	TSL:1 MANE Select	c.4461A>C	p.Arg1487Ser	missense	Exon 34 of 65	ENSP00000262464.4
	FBN2	ENST00000939405.1		c.4362A>C	p.Arg1454Ser	missense	Exon 33 of 64	ENSP00000609464.1
	FBN2	ENST00000939404.1		c.4308A>C	p.Arg1436Ser	missense	Exon 33 of 64	ENSP00000609463.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461818 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727200

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44704

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39694

South Asian (SAS) AF: 0.00 AC: 0 AN: 86246

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53408

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5766

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111992

Other (OTH) AF: 0.00 AC: 0 AN: 60392

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.30
BayesDel_addAF	Uncertain	0.062	T
BayesDel_noAF	Benign	-0.15
CADD	Benign	15
DANN	Uncertain	0.97
DEOGEN2	Uncertain	0.64	D
Eigen	Benign	-0.71
Eigen_PC	Benign	-0.79
FATHMM_MKL	Benign	0.30	N
LIST_S2	Benign	0.84	T
M_CAP	Uncertain	0.12	D
MetaRNN	Benign	0.18	T
MetaSVM	Uncertain	0.30	D
MutationAssessor	Benign	1.5	L
PhyloP100		-0.57
PrimateAI	Uncertain	0.55	T
PROVEAN	Uncertain	-3.3	D
REVEL	Uncertain	0.50
Sift	Uncertain	0.013	D
Sift4G	Benign	0.54	T
Polyphen		0.037	B
Vest4		0.46
MutPred		0.41		Loss of catalytic residue at R1487 (P = 0.0099)
MVP		0.46
MPC		0.42
ClinPred		0.97	D
GERP RS		-4.6
Varity_R		0.33
gMVP		0.82
Mutation Taster		=75/25	polymorphism

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

Other links and lift over

dbSNP: rs797045573; hg19: chr5-127664398;