chr15-50252520-C-T

Variant names:

• chr15-50252520-C-T
• rs267606861
• NM_002112.4:c.951G>A

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3 PP5

The NM_002112.4(HDC):​c.951G>A​(p.Trp317*) 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
• Publications: 38 publications found

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]

HDC Gene-Disease associations (from GenCC):

• Tourette syndrome

  Inheritance: Unknown, AD Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 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. No scorers claiming Uncertain. Scorers claiming Benign: max_spliceai.
• PP5: Variant 15-50252520-C-T is Pathogenic according to our data. Variant chr15-50252520-C-T is described in ClinVar as Pathogenic. ClinVar VariationId is 14912.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HDC	NM_002112.4	c.951G>A	p.Trp317*	stop_gained, splice_region_variant	Exon 9 of 12	ENST00000267845.8	NP_002103.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HDC	ENST00000267845.8	c.951G>A	p.Trp317*	stop_gained, splice_region_variant	Exon 9 of 12	1	NM_002112.4	ENSP00000267845.3
HDC	ENST00000543581.5	c.951G>A	p.Trp317*	stop_gained, splice_region_variant	Exon 9 of 11	1		ENSP00000440252.1
HDC	ENST00000559816.1	n.695G>A		splice_region_variant, non_coding_transcript_exon_variant	Exon 2 of 5	2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Tourette syndrome Pathogenic:1

Jan 08, 2014

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

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
PhyloP100		6.0
Vest4		0.96
GERP RS		5.3
Mutation Taster		=0/200	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs267606861; hg19: chr15-50544717;