chr19-8066097-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_032447.5(FBN3):ā€‹c.8252G>Cā€‹(p.Arg2751Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000123 in 1,461,166 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (ā˜…ā˜…). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R2751C) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 33)
Exomes š‘“: 0.000012 ( 0 hom. )

Consequence

FBN3
NM_032447.5 missense

Scores

1
10
8

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 1.35
Variant links:
Genes affected
FBN3 (HGNC:18794): (fibrillin 3) This gene encodes a memebr of the fibrillin protein family. Fibrillins are extracellular matrix molecules that assemble into microfibrils in many connective tissues. This gene is most highly expressed in fetal tissues and its protein product is localized to extracellular microfibrils of developing skeletal elements, skin, lung, kidney, and skeletal muscle. This gene is potentially involved in Weill-Marchesani syndrome. [provided by RefSeq, Mar 2016]

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2
Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene Transcript HGVSc HGVSp Effect #exon/exons MANE UniProt
FBN3NM_032447.5 linkuse as main transcriptc.8252G>C p.Arg2751Pro missense_variant 64/64 ENST00000600128.6

Ensembl

Gene Transcript HGVSc HGVSp Effect #exon/exons TSL MANE Appris UniProt
FBN3ENST00000600128.6 linkuse as main transcriptc.8252G>C p.Arg2751Pro missense_variant 64/641 NM_032447.5
FBN3ENST00000270509.6 linkuse as main transcriptc.8252G>C p.Arg2751Pro missense_variant 63/631
FBN3ENST00000601739.5 linkuse as main transcriptc.8252G>C p.Arg2751Pro missense_variant 64/641
FBN3ENST00000651877.1 linkuse as main transcriptc.8378G>C p.Arg2793Pro missense_variant 64/64 P1

Frequencies

GnomAD3 genomes
Cov.:
33
GnomAD3 exomes
AF:
0.00000800
AC:
2
AN:
250056
Hom.:
0
AF XY:
0.00
AC XY:
0
AN XY:
135340
show subpopulations
Gnomad AFR exome
AF:
0.00
Gnomad AMR exome
AF:
0.00
Gnomad ASJ exome
AF:
0.00
Gnomad EAS exome
AF:
0.00
Gnomad SAS exome
AF:
0.00
Gnomad FIN exome
AF:
0.00
Gnomad NFE exome
AF:
0.0000178
Gnomad OTH exome
AF:
0.00
GnomAD4 exome
AF:
0.0000123
AC:
18
AN:
1461166
Hom.:
0
Cov.:
31
AF XY:
0.00000963
AC XY:
7
AN XY:
726904
show subpopulations
Gnomad4 AFR exome
AF:
0.00
Gnomad4 AMR exome
AF:
0.00
Gnomad4 ASJ exome
AF:
0.00
Gnomad4 EAS exome
AF:
0.00
Gnomad4 SAS exome
AF:
0.00
Gnomad4 FIN exome
AF:
0.00
Gnomad4 NFE exome
AF:
0.0000162
Gnomad4 OTH exome
AF:
0.00
GnomAD4 genome
Cov.:
33
Alfa
AF:
0.0000333
Hom.:
0
ExAC
AF:
0.00000824
AC:
1
EpiCase
AF:
0.0000545
EpiControl
AF:
0.00

ClinVar

Significance: Uncertain significance
Submissions summary: Uncertain:2
Revision: criteria provided, multiple submitters, no conflicts
LINK: link

Submissions by phenotype

not specified Uncertain:1
Uncertain significance, criteria provided, single submitterclinical testingAmbry GeneticsDec 20, 2023The c.8252G>C (p.R2751P) alteration is located in exon 63 (coding exon 63) of the FBN3 gene. This alteration results from a G to C substitution at nucleotide position 8252, causing the arginine (R) at amino acid position 2751 to be replaced by a proline (P). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -
not provided Uncertain:1
Uncertain significance, criteria provided, single submitterclinical testingLabcorp Genetics (formerly Invitae), LabcorpMar 25, 2022This sequence change replaces arginine, which is basic and polar, with proline, which is neutral and non-polar, at codon 2751 of the FBN3 protein (p.Arg2751Pro). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. 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"). This variant has not been reported in the literature in individuals affected with FBN3-related conditions. This variant is present in population databases (rs764446097, gnomAD 0.002%). -

Computational scores

Source: dbNSFP v4.3

Name
Calibrated prediction
Score
Prediction
AlphaMissense
Uncertain
0.44
BayesDel_addAF
Pathogenic
0.20
D
BayesDel_noAF
Uncertain
0.060
CADD
Benign
16
DANN
Benign
0.97
DEOGEN2
Benign
0.18
T;T;T
Eigen
Benign
-0.45
Eigen_PC
Benign
-0.66
FATHMM_MKL
Uncertain
0.89
D
LIST_S2
Benign
0.64
.;.;T
M_CAP
Benign
0.072
D
MetaRNN
Uncertain
0.68
D;D;D
MetaSVM
Uncertain
-0.060
T
MutationAssessor
Uncertain
2.5
M;M;M
MutationTaster
Benign
0.94
D
PrimateAI
Benign
0.24
T
PROVEAN
Uncertain
-3.4
.;D;.
REVEL
Uncertain
0.58
Sift
Uncertain
0.018
.;D;.
Sift4G
Uncertain
0.0030
D;D;D
Polyphen
0.94
P;P;P
Vest4
0.53
MutPred
0.63
Loss of MoRF binding (P = 0.0016);Loss of MoRF binding (P = 0.0016);Loss of MoRF binding (P = 0.0016);
MVP
0.77
MPC
0.89
ClinPred
0.97
D
GERP RS
-3.8
Varity_R
0.67
gMVP
0.91

Splicing

Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
0.15
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

Below is the list of publications found by LitVar. It may be empty.

Other links and lift over

dbSNP: rs764446097; hg19: chr19-8130981; API