15-50252520-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PM4 PP5

The NM_002112.4(HDC):c.951G>A(p.Trp317Ter) variant causes a stop gained, splice region change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (no stars). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: HDC NM_002112.4 stop_gained, splice_region
• Scores: Splicing: ADA: 0.9996
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 5.97

Genes affected

HDC (HGNC:4855): (histidine decarboxylase) This gene encodes a member of the group II decarboxylase family and forms a homodimer that converts L-histidine to histamine in a pyridoxal phosphate dependent manner. Histamine regulates several physiologic processes, including neurotransmission, gastric acid secretion,inflamation, and smooth muscle tone.[provided by RefSeq, Aug 2010]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM4: Stoplost variant in NM_002112.4 Downstream stopcodon found after 248 codons.
• PP5: Variant 15-50252520-C-T is Pathogenic according to our data. Variant chr15-50252520-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 14912.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
HDC	NM_002112.4	c.951G>A	p.Trp317Ter	stop_gained, splice_region_variant	9/12	ENST00000267845.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
HDC	ENST00000267845.8	c.951G>A	p.Trp317Ter	stop_gained, splice_region_variant	9/12	1	NM_002112.4	P1
HDC	ENST00000543581.5	c.951G>A	p.Trp317Ter	stop_gained, splice_region_variant	9/11	1
HDC	ENST00000559816.1	n.695G>A		splice_region_variant, non_coding_transcript_exon_variant	2/5	2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Tourette syndrome Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Jan 08, 2014

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.56	D
BayesDel_noAF	Pathogenic	0.57
Cadd	Pathogenic	42
Dann	Uncertain	1.0
Eigen	Pathogenic	0.84
Eigen_PC	Pathogenic	0.70
FATHMM_MKL	Uncertain	0.96	D
M_CAP	Pathogenic	0.34	D
MutationTaster	Benign	1.0	A;A
Vest4		0.96
GERP RS		5.3

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.95
SpliceAI score (max)		0.030		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: rs267606861; hg19: chr15-50544717;