Genetic Variant FLT4:p.Arg1146Leu (chr5-180612606-C-A) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

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

The NM_182925.5(FLT4):c.3437G>T(p.Arg1146Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,460,544 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. R1146H) has been classified as Benign.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

FLT4
NM_182925.5 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.746

Publications

0 publications found

Variant links:

Genes affected

FLT4 (HGNC:3767): (fms related receptor tyrosine kinase 4) This gene encodes a tyrosine kinase receptor for vascular endothelial growth factors C and D. The protein is thought to be involved in lymphangiogenesis and maintenance of the lymphatic endothelium. Mutations in this gene cause hereditary lymphedema type IA. [provided by RefSeq, Jul 2008]

FLT4 Gene-Disease associations (from GenCC):

lymphatic malformation 1
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: ClinGen, Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P
capillary infantile hemangioma
Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
congenital heart defects, multiple types, 7
Inheritance: AD Classification: STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
lymphatic malformation
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
tetralogy of fallot
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

FLT4 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FLT4	NM_182925.5 link	c.3437G>T	p.Arg1146Leu	missense_variant	Exon 26 of 30	ENST00000261937.11	NP_891555.2	P35916-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FLT4	ENST00000261937.11 link	c.3437G>T	p.Arg1146Leu	missense_variant	Exon 26 of 30	1	NM_182925.5	ENSP00000261937.6		P35916-2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.85e-7

AC:

AN:

1460544

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

726710

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33462

American (AMR)

AF:

0.00

AC:

AN:

44710

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26124

East Asian (EAS)

AF:

0.00

AC:

AN:

39698

South Asian (SAS)

AF:

0.00

AC:

AN:

86228

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53382

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1110824

Other (OTH)

AF:

0.0000166

AC:

AN:

60348

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.13

BayesDel_addAF

Uncertain

0.037

BayesDel_noAF

Benign

-0.18

CADD

Benign

9.1

(source)

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.58

D;.;D

Eigen

Benign

-0.74

Eigen_PC

Benign

-0.81

FATHMM_MKL

Uncertain

0.86

LIST_S2

Benign

0.76

T;T;T

M_CAP

Uncertain

0.13

MetaRNN

Uncertain

0.61

D;D;D

MetaSVM

Benign

-0.39

MutationAssessor

Benign

0.81

L;L;.

PhyloP100

0.75

PrimateAI

Benign

0.25

PROVEAN

Uncertain

-3.0

D;D;D

REVEL

Uncertain

0.33

Sift

Uncertain

0.013

D;D;D

Sift4G

Benign

0.062

T;T;T

Polyphen

0.20

B;.;B

Vest4

0.58

MutPred

0.61

Loss of MoRF binding (P = 0.0092);Loss of MoRF binding (P = 0.0092);Loss of MoRF binding (P = 0.0092);

MVP

0.50

MPC

1.1

ClinPred

0.32

GERP RS

-0.63

Varity_R

0.23

gMVP

0.49

Mutation Taster

=93/7

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.050

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over