rs121908084

Variant names:

• chr2-1487991-G-A
• rs121908084
• NM_001206744.2:c.1768G>A

Your query was ambiguous. Multiple possible variants found:

• chr2-1487991-G-A
• chr2-1487991-G-C

Variant summary

Our verdict is Likely pathogenic. The variant received 7 ACMG points: 7P and 0B. PM2 PP3_Strong PP5

The NM_001206744.2(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 NM_001206744.2 missense, splice_region
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 5.41
• Publications: 7 publications found

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

ENSG00000231482 (HGNC:):

LALTOP (HGNC:58132):

ACMG classification

Our verdict: Likely_pathogenic. The variant received 7 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF, max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.
• PP5: Variant 2-1487991-G-A is Pathogenic according to our data. Variant chr2-1487991-G-A is described in ClinVar as Pathogenic. ClinVar VariationId is 4045.Status of the report is no_assertion_criteria_provided, 0 stars.

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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TPO	NM_001206744.2	MANE Select	c.1768G>A	p.Gly590Ser	missense splice_region	Exon 10 of 17	NP_001193673.1	P07202-1
	TPO	NM_000547.6		c.1768G>A	p.Gly590Ser	missense splice_region	Exon 10 of 17	NP_000538.3
	TPO	NM_175721.3		c.1768G>A	p.Gly590Ser	missense splice_region	Exon 9 of 15	NP_783652.1	P07202-4

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TPO	ENST00000329066.9	TSL:1 MANE Select	c.1768G>A	p.Gly590Ser	missense splice_region	Exon 10 of 17	ENSP00000329869.4	P07202-1
	TPO	ENST00000345913.8	TSL:1	c.1768G>A	p.Gly590Ser	missense splice_region	Exon 10 of 17	ENSP00000318820.7	P07202-1
	TPO	ENST00000382198.5	TSL:1	c.1249G>A	p.Gly417Ser	missense splice_region	Exon 8 of 15	ENSP00000371633.1	P07202-5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000410 Hom.: 0

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
1	-	-	Deficiency of iodide peroxidase (1)

Computational scores

Source: dbNSFP v4.9

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
Eigen	Uncertain	0.59
Eigen_PC	Uncertain	0.58
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.95	D
M_CAP	Pathogenic	0.42	D
MetaRNN	Uncertain	0.73	D
MetaSVM	Uncertain	-0.19	T
MutationAssessor	Benign	1.4	L
PhyloP100		5.4
PrimateAI	Uncertain	0.59	T
PROVEAN	Pathogenic	-4.6	D
REVEL	Uncertain	0.48
Sift	Uncertain	0.021	D
Sift4G	Benign	0.20	T
Polyphen		1.0	D
Vest4		0.37
MutPred		0.47		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
Mutation Taster		=1/99	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs121908084; hg19: chr2-1491763;