11-113983169-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_000869.6(HTR3A):c.424C>A(p.Gln142Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: HTR3A NM_000869.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.733

Genes affected

HTR3A (HGNC:5297): (5-hydroxytryptamine receptor 3A) The product of this gene belongs to the ligand-gated ion channel receptor superfamily. This gene encodes subunit A of the type 3 receptor for 5-hydroxytryptamine (serotonin), a biogenic hormone that functions as a neurotransmitter, a hormone, and a mitogen. This receptor causes fast, depolarizing responses in neurons after activation. It appears that the heteromeric combination of A and B subunits is necessary to provide the full functional features of this receptor, since either subunit alone results in receptors with very low conductance and response amplitude. Alternatively spliced transcript variants encoding different isoforms have been identified. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.28692967).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
HTR3A	NM_000869.6	c.424C>A	p.Gln142Lys	missense_variant	5/9	ENST00000504030.7
HTR3A	NM_213621.4	c.424C>A	p.Gln142Lys	missense_variant	5/8
HTR3A	NM_001161772.3	c.379C>A	p.Gln127Lys	missense_variant	5/9
HTR3A	NR_046363.2	n.642C>A		non_coding_transcript_exon_variant	5/8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
HTR3A	ENST00000504030.7	c.424C>A	p.Gln142Lys	missense_variant	5/9	1	NM_000869.6	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 17, 2023

The c.442C>A (p.Q148K) alteration is located in exon 5 (coding exon 5) of the HTR3A gene. This alteration results from a C to A substitution at nucleotide position 442, causing the glutamine (Q) at amino acid position 148 to be replaced by a lysine (K). 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	Benign	0.070
BayesDel_addAF	Benign	-0.10	T
BayesDel_noAF	Benign	-0.38
Cadd	Benign	7.0
Dann	Benign	0.88
DEOGEN2	Benign	0.21	T;.;.;.;.
Eigen	Benign	-0.87
Eigen_PC	Benign	-0.89
FATHMM_MKL	Benign	0.15	N
LIST_S2	Benign	0.65	T;T;T;T;T
M_CAP	Benign	0.034	D
MetaRNN	Benign	0.29	T;T;T;T;T
MetaSVM	Benign	-0.91	T
MutationAssessor	Benign	0.90	L;.;.;L;.
MutationTaster	Benign	1.0	N;N;N;N;N;N
PrimateAI	Benign	0.28	T
PROVEAN	Benign	-0.66	N;N;N;N;N
REVEL	Benign	0.11
Sift	Benign	0.37	T;T;T;T;T
Sift4G	Benign	0.59	T;T;T;T;T
Vest4		0.28
MutPred		0.44		.;Gain of methylation at Q148 (P = 0.0124);Gain of methylation at Q148 (P = 0.0124);.;.;
MVP		0.50
MPC		0.11
ClinPred		0.055	T
GERP RS		-2.2
Varity_R		0.063
gMVP		0.51

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: chr11-113853891;