NM_000621.5:c.228G>T

Variant names:

• chr13-46895679-C-A
• NM_000621.5:c.228G>T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_000621.5(HTR2A):​c.228G>T​(p.Trp76Cys) variant causes a missense change involving the alteration of a 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 Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: HTR2A NM_000621.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.91

Genes affected

HTR2A (HGNC:5293): (5-hydroxytryptamine receptor 2A) This gene encodes one of the receptors for serotonin, a neurotransmitter with many roles. Mutations in this gene are associated with susceptibility to schizophrenia and obsessive-compulsive disorder, and are also associated with response to the antidepressant citalopram in patients with major depressive disorder (MDD). MDD patients who also have a mutation in intron 2 of this gene show a significantly reduced response to citalopram as this antidepressant downregulates expression of this gene. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Sep 2009]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.798

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HTR2A	NM_000621.5	c.228G>T	p.Trp76Cys	missense_variant	Exon 2 of 4	ENST00000542664.4	NP_000612.1
HTR2A	NM_001378924.1	c.228G>T	p.Trp76Cys	missense_variant	Exon 2 of 4		NP_001365853.1
HTR2A	NM_001165947.5	c.-78+995G>T		intron_variant	Intron 1 of 2		NP_001159419.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HTR2A	ENST00000542664.4	c.228G>T	p.Trp76Cys	missense_variant	Exon 2 of 4	1	NM_000621.5	ENSP00000437737.1
HTR2A	ENST00000543956.5	c.-78+995G>T		intron_variant	Intron 1 of 2	1		ENSP00000441861.2
HTR2A	ENST00000612998.1	c.135G>T	p.Trp45Cys	missense_variant	Exon 1 of 1	6		ENSP00000482708.1

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

not specified Uncertain:1

Jan 16, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.228G>T (p.W76C) alteration is located in exon 2 (coding exon 1) of the HTR2A gene. This alteration results from a G to T substitution at nucleotide position 228, causing the tryptophan (W) at amino acid position 76 to be replaced by a cysteine (C). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.96
BayesDel_addAF	Pathogenic	0.29	D
BayesDel_noAF	Pathogenic	0.18
CADD	Pathogenic	31
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.69	D;D;.
Eigen	Pathogenic	0.75
Eigen_PC	Pathogenic	0.79
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.96	.;D;D
M_CAP	Benign	0.028	D
MetaRNN	Pathogenic	0.80	D;D;D
MetaSVM	Benign	-0.88	T
MutationAssessor	Benign	1.6	L;L;.
PrimateAI	Uncertain	0.79	T
PROVEAN	Pathogenic	-9.6	D;D;.
REVEL	Uncertain	0.51
Sift	Pathogenic	0.0	D;D;.
Sift4G	Pathogenic	0.0010	D;D;D
Polyphen		1.0	D;D;.
Vest4		0.86
MutPred		0.47		Loss of catalytic residue at W76 (P = 0.1211);Loss of catalytic residue at W76 (P = 0.1211);.;
MVP		0.84
MPC		1.3
ClinPred		1.0	D
GERP RS		5.8
Varity_R		0.83
gMVP		0.95

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr13-47469814;