rs137852866

Variant names:

• chr12-121846919-A-C
• rs137852866
• NM_002150.3:c.774T>G

Variant summary

Our verdict is Pathogenic. The variant received 11 ACMG points: 11P and 0B. PVS1 PM2 PP5

The NM_002150.3(HPD):​c.774T>G​(p.Tyr258*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (no stars). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: HPD NM_002150.3 stop_gained
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: -0.181
• Publications: 4 publications found

Genes affected

HPD (HGNC:5147): (4-hydroxyphenylpyruvate dioxygenase) The protein encoded by this gene is an enzyme in the catabolic pathway of tyrosine. The encoded protein catalyzes the conversion of 4-hydroxyphenylpyruvate to homogentisate. Defects in this gene are a cause of tyrosinemia type 3 (TYRO3) and hawkinsinuria (HAWK). Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jan 2010]

HPD Gene-Disease associations (from GenCC):

• tyrosinemia type III

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, G2P, ClinGen, Labcorp Genetics (formerly Invitae)
• hawkinsinuria

  Inheritance: AD, Unknown Classification: STRONG, LIMITED Submitted by: ClinGen, G2P, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Pathogenic. The variant received 11 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 12-121846919-A-C is Pathogenic according to our data. Variant chr12-121846919-A-C is described in ClinVar as Pathogenic. ClinVar VariationId is 1574.Status of the report is no_assertion_criteria_provided, 0 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002150.3. 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
	HPD	NM_002150.3	MANE Select	c.774T>G	p.Tyr258*	stop_gained	Exon 11 of 14	NP_002141.2	P32754-1
	HPD	NM_001171993.2		c.657T>G	p.Tyr219*	stop_gained	Exon 13 of 16	NP_001165464.1	P32754-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	HPD	ENST00000289004.8	TSL:1 MANE Select	c.774T>G	p.Tyr258*	stop_gained	Exon 11 of 14	ENSP00000289004.4	P32754-1
	HPD	ENST00000868949.1		c.774T>G	p.Tyr258*	stop_gained	Exon 11 of 15	ENSP00000539008.1
	HPD	ENST00000868952.1		c.825T>G	p.Tyr275*	stop_gained	Exon 11 of 14	ENSP00000539011.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
1	-	-	Tyrosinemia type III (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.32
CADD	Pathogenic	34
DANN	Benign	0.93
Eigen	Benign	-0.69
Eigen_PC	Benign	-1.0
FATHMM_MKL	Benign	0.65	D
PhyloP100		-0.18
Vest4		0.97
GERP RS		-5.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Mutation Taster		=2/198	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
Splicevardb		2.0
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

Other links and lift over

dbSNP: rs137852866; hg19: chr12-122284825;