dbSNP rs28991292: TPO:p.Val748Met (chr2-1496621-G-A) – ACMG Classification: Benign (-13 pts)

Variant summary

Our verdict is Benign. The variant received -13 ACMG points: 0P and 13B. BP4_StrongBP6BS1BS2

The NM_001206744.2(TPO):c.2242G>A(p.Val748Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00119 in 1,613,864 control chromosomes in the GnomAD database, including 35 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.0021 ( 6 hom., cov: 33)

Exomes 𝑓: 0.0011 ( 29 hom. )

Consequence

TPO
NM_001206744.2 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:2

Conservation

PhyloP100: 1.89

Publications

6 publications found

Variant links:

Genes affected

TPO (HGNC:12015): (thyroid peroxidase) This gene encodes a membrane-bound glycoprotein. The encoded protein acts as an enzyme and plays a central role in thyroid gland function. The protein functions in the iodination of tyrosine residues in thyroglobulin and phenoxy-ester formation between pairs of iodinated tyrosines to generate the thyroid hormones, thyroxine and triiodothyronine. Mutations in this gene are associated with several disorders of thyroid hormonogenesis, including congenital hypothyroidism, congenital goiter, and thyroid hormone organification defect IIA. Multiple transcript variants encoding distinct isoforms have been identified for this gene, but the full-length nature of some variants has not been determined. [provided by RefSeq, May 2011]

TPO Gene-Disease associations (from GenCC):

thyroid dyshormonogenesis 2A
Inheritance: AR Classification: STRONG Submitted by: PanelApp Australia, Labcorp Genetics (formerly Invitae)
familial thyroid dyshormonogenesis
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

TPO links:

ENSG00000231482 (HGNC:):

ENSG00000231482 links:

LALTOP (HGNC:58132):

LALTOP links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -13 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.008880943).

BP6

Variant 2-1496621-G-A is Benign according to our data. Variant chr2-1496621-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 256612.

BS1

Variant frequency is greater than expected in population amr. GnomAd4 allele frequency = 0.0021 (319/152086) while in subpopulation AMR AF = 0.0179 (273/15278). AF 95% confidence interval is 0.0161. There are 6 homozygotes in GnomAd4. There are 168 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 6 AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001206744.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
TPO	NM_001206744.2	MANE Select	c.2242G>A	p.Val748Met	missense	Exon 13 of 17	NP_001193673.1	P07202-1
TPO	NM_000547.6		c.2242G>A	p.Val748Met	missense	Exon 13 of 17	NP_000538.3
TPO	NM_175721.3		c.2242G>A	p.Val748Met	missense	Exon 12 of 15	NP_783652.1	P07202-4

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
TPO	ENST00000329066.9	TSL:1 MANE Select	c.2242G>A	p.Val748Met	missense	Exon 13 of 17	ENSP00000329869.4	P07202-1
TPO	ENST00000345913.8	TSL:1	c.2242G>A	p.Val748Met	missense	Exon 13 of 17	ENSP00000318820.7	P07202-1
TPO	ENST00000382201.7	TSL:1	c.2071G>A	p.Val691Met	missense	Exon 12 of 16	ENSP00000371636.3	P07202-2

Frequencies

GnomAD3 genomes

AF:

0.00209

AC:

318

AN:

151970

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000604

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0178

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00156

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000736

Gnomad OTH

AF:

0.00384

GnomAD2 exomes

AF:

0.00444

AC:

1117

AN:

251480

AF XY:

0.00349

show subpopulations

Gnomad AFR exome

AF:

0.000615

Gnomad AMR exome

AF:

0.0311

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000217

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000439

Gnomad OTH exome

AF:

0.00309

GnomAD4 exome

AF:

0.00109

AC:

1597

AN:

1461778

Hom.:

Cov.:

AF XY:

0.000974

AC XY:

708

AN XY:

727194

show subpopulations

African (AFR)

AF:

0.000239

AC:

AN:

33478

American (AMR)

AF:

0.0303

AC:

1354

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00176

AC:

AN:

39700

South Asian (SAS)

AF:

0.000139

AC:

AN:

86248

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53400

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5690

European-Non Finnish (NFE)

AF:

0.0000845

AC:

AN:

1112010

Other (OTH)

AF:

0.000977

AC:

AN:

60392

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.477

Heterozygous variant carriers

121

242

363

484

605

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

104

130

<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

AF:

0.00210

AC:

319

AN:

152086

Hom.:

Cov.:

AF XY:

0.00226

AC XY:

168

AN XY:

74348

show subpopulations

African (AFR)

AF:

0.000602

AC:

AN:

41510

American (AMR)

AF:

0.0179

AC:

273

AN:

15278

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00156

AC:

AN:

5126

South Asian (SAS)

AF:

0.00

AC:

AN:

4816

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10606

Middle Eastern (MID)

AF:

0.00

AC:

AN:

292

European-Non Finnish (NFE)

AF:

0.0000736

AC:

AN:

67970

Other (OTH)

AF:

0.00380

AC:

AN:

2106

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.493

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

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

Alfa

AF:

0.000534

Hom.:

Bravo

AF:

0.00318

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.00343

AC:

416

Asia WGS

AF:

0.00260

AC:

AN:

3478

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

ClinVar submissions

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

Deficiency of iodide peroxidase (1)

not provided (1)

not specified (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.12

BayesDel_addAF

Benign

-0.29

BayesDel_noAF

Benign

-0.17

CADD

Benign

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.47

Eigen

Uncertain

0.38

Eigen_PC

Uncertain

0.24

FATHMM_MKL

Benign

0.66

LIST_S2

Benign

0.85

MetaRNN

Benign

0.0089

MetaSVM

Uncertain

-0.086

MutationAssessor

Pathogenic

3.6

PhyloP100

1.9

PrimateAI

Benign

0.44

PROVEAN

Benign

-2.0

REVEL

Uncertain

0.46

Sift

Uncertain

0.020

Sift4G

Uncertain

0.019

Polyphen

0.99

Vest4

0.24

MVP

0.89

MPC

0.24

ClinPred

0.058

GERP RS

4.0

Varity_R

0.13

gMVP

0.43

Mutation Taster

=92/8

polymorphism

(source)

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

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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

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over