2-1487991-G-A

Position:

• chr2-1487991-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP5

The ENST00000329066.9(TPO):​c.1768G>A​(p.Gly590Ser) variant causes a missense, splice region change. The variant was absent in control chromosomes in GnomAD project. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (no stars).

• Frequency: Genomes: not found (cov: 33)
• Consequence: TPO ENST00000329066.9 missense, splice_region
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 5.41

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]

(HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 2-1487991-G-A is Pathogenic according to our data. Variant chr2-1487991-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 4045.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TPO	NM_001206744.2	c.1768G>A	p.Gly590Ser	missense_variant, splice_region_variant	10/17	ENST00000329066.9	NP_001193673.1
LOC124905966	XR_007086185.1	n.167-1800C>T		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TPO	ENST00000329066.9	c.1768G>A	p.Gly590Ser	missense_variant, splice_region_variant	10/17	1	NM_001206744.2	ENSP00000329869	P1
	ENST00000650512.1	n.548-69530C>T		intron_variant, non_coding_transcript_variant

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 33

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Deficiency of iodide peroxidase Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Jan 01, 1995

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Uncertain	0.034	T
BayesDel_noAF	Benign	-0.19
CADD	Pathogenic	33
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.73	D;D;.;.;.
Eigen	Uncertain	0.59
Eigen_PC	Uncertain	0.58
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.95	D;.;D;D;D
M_CAP	Pathogenic	0.42	D
MetaRNN	Uncertain	0.73	D;D;D;D;D
MetaSVM	Uncertain	-0.19	T
MutationAssessor	Benign	1.4	L;L;L;.;.
MutationTaster	Benign	0.50	A;A;A;A;A;A;A
PrimateAI	Uncertain	0.59	T
PROVEAN	Pathogenic	-4.6	D;D;D;D;D
REVEL	Uncertain	0.48
Sift	Uncertain	0.021	D;D;D;T;D
Sift4G	Benign	0.20	T;T;T;T;T
Polyphen		1.0	D;D;D;D;.
Vest4		0.37
MutPred		0.47		Loss of catalytic residue at G590 (P = 0.0683);Loss of catalytic residue at G590 (P = 0.0683);Loss of catalytic residue at G590 (P = 0.0683);.;.;
MVP		0.90
MPC		0.67
ClinPred		1.0	D
GERP RS		4.8
Varity_R		0.47
gMVP		0.83

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	1.0
SpliceAI score (max)		0.81		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.81		Position offset: 0

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

Publications

LitVar

Other links and lift over

dbSNP: rs121908084; hg19: chr2-1491763;