Genetic Variant THBS1:p.Ile259Asn (chr15-39584060-T-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_003246.4(THBS1):c.776T>A(p.Ile259Asn) 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 1,461,888 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. I259T) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

THBS1
NM_003246.4 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 2.77

Publications

0 publications found

Variant links:

Genes affected

THBS1 (HGNC:11785): (thrombospondin 1) The protein encoded by this gene is a subunit of a disulfide-linked homotrimeric protein. This protein is an adhesive glycoprotein that mediates cell-to-cell and cell-to-matrix interactions. This protein can bind to fibrinogen, fibronectin, laminin, type V collagen and integrins alpha-V/beta-1. This protein has been shown to play roles in platelet aggregation, angiogenesis, and tumorigenesis. [provided by RefSeq, Jul 2008]

THBS1 Gene-Disease associations (from GenCC):

congenital glaucoma
Inheritance: AD Classification: STRONG Submitted by: PanelApp Australia
nonsyndromic genetic hearing loss
Inheritance: AR Classification: LIMITED Submitted by: Ambry Genetics

THBS1 links:

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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;

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_003246.4. 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
	THBS1	NM_003246.4	MANE Select	c.776T>A	p.Ile259Asn	missense	Exon 5 of 22	NP_003237.2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
THBS1	ENST00000260356.6	TSL:1 MANE Select	c.776T>A	p.Ile259Asn	missense	Exon 5 of 22	ENSP00000260356.5	P07996-1
THBS1	ENST00000880750.1		c.776T>A	p.Ile259Asn	missense	Exon 6 of 23	ENSP00000550809.1
THBS1	ENST00000880751.1		c.776T>A	p.Ile259Asn	missense	Exon 6 of 23	ENSP00000550810.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461888

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727244

show subpopulations

African (AFR)

AF:

0.0000299

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86254

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53418

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1112012

Other (OTH)

AF:

0.00

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.42

BayesDel_addAF

Uncertain

0.071

BayesDel_noAF

Benign

-0.14

CADD

Benign

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.40

Eigen

Uncertain

0.22

Eigen_PC

Uncertain

0.35

FATHMM_MKL

Uncertain

0.90

LIST_S2

Uncertain

0.95

M_CAP

Benign

0.046

MetaRNN

Uncertain

0.66

MetaSVM

Uncertain

-0.23

MutationAssessor

Uncertain

2.1

PhyloP100

2.8

PrimateAI

Uncertain

0.57

PROVEAN

Benign

-1.7

REVEL

Uncertain

0.46

Sift

Benign

0.034

Sift4G

Uncertain

0.0070

Polyphen

0.45

Vest4

0.79

MutPred

0.65

Gain of disorder (P = 0.0261)

MVP

0.53

MPC

0.81

ClinPred

0.82

GERP RS

5.9

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.31

gMVP

0.85

Mutation Taster

=85/15

polymorphism

(source)

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over