NM_002150.3:c.1151delT

Variant names:

• chr12-121839758-CA-C
• rs1555339247
• NM_002150.3:c.1151delT

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PVS1_Moderate PM2

The NM_002150.3(HPD):​c.1151delT​(p.Met384ArgfsTer72) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: HPD NM_002150.3 frameshift
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.04

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. Fraction of 0.0262 CDS is truncated, and there are 0 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HPD	NM_002150.3	c.1151delT	p.Met384ArgfsTer72	frameshift_variant	Exon 14 of 14	ENST00000289004.8	NP_002141.2
HPD	NM_001171993.2	c.1034delT	p.Met345ArgfsTer72	frameshift_variant	Exon 16 of 16		NP_001165464.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HPD	ENST00000289004.8	c.1151delT	p.Met384ArgfsTer72	frameshift_variant	Exon 14 of 14	1	NM_002150.3	ENSP00000289004.4
HPD	ENST00000543163.5	c.1034delT	p.Met345ArgfsTer72	frameshift_variant	Exon 15 of 15	5		ENSP00000441677.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Tyrosinemia type III;C2931042:Hawkinsinuria Uncertain:1

Aug 21, 2017

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change results in a premature translational stop signal in the HPD gene (p.Met384Argfs*72). While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 10 amino acids of the HPD protein. This variant is not present in population databases (ExAC no frequency). Experimental studies and prediction algorithms are not available for this variant, and the functional significance of the deleted amino acid(s) is currently unknown. This variant has not been reported in the literature in individuals with HPD-related disease. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

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

LitVar

Other links and lift over

dbSNP: rs1555339247; hg19: chr12-122277664;