15-82849716-T-A

Position:

• chr15-82849716-T-A

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PM4

The NM_004839.4(HOMER2):​c.1031A>T​(p.Ter344Leuext*?) variant causes a stop lost 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: 33)
• Consequence: HOMER2 NM_004839.4 stop_lost
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.42

Genes affected

HOMER2 (HGNC:17513): (homer scaffold protein 2) This gene encodes a member of the homer family of dendritic proteins. Members of this family regulate group 1 metabotrophic glutamate receptor function. The encoded protein is a postsynaptic density scaffolding protein. Alternative splicing results in multiple transcript variants. Two related pseudogenes have been identified on chromosome 14. [provided by RefSeq, Jun 2011]

HOMER2 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM4: Stoplost variant in NM_004839.4 Downstream stopcodon found after 62 codons.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
HOMER2	NM_004839.4	c.1031A>T	p.Ter344Leuext*?	stop_lost	9/9	ENST00000450735.7	NP_004830.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
HOMER2	ENST00000450735.7	c.1031A>T	p.Ter344Leuext*?	stop_lost	9/9	1	NM_004839.4	ENSP00000407634.2
HOMER2	ENST00000558090.2	c.11A>T	p.Ter4Leuext*?	stop_lost	1/2	1		ENSP00000452870.1
HOMER2	ENST00000304231.12	c.1064A>T	p.Ter355Leuext*?	stop_lost	9/9	5		ENSP00000305632.8
HOMER2	ENST00000558552.1	n.911A>T		non_coding_transcript_exon_variant	3/3	2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 08, 2024

This sequence change disrupts the translational stop signal of the HOMER2 mRNA. It is expected to extend the length of the HOMER2 protein by 10 additional amino acid residues. This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with HOMER2-related conditions. ClinVar contains an entry for this variant (Variation ID: 2022503). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. 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

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Uncertain	0.14	D
BayesDel_noAF	Uncertain	-0.030
CADD	Benign	16
DANN	Benign	0.86
Eigen	Pathogenic	0.96
Eigen_PC	Pathogenic	0.80
FATHMM_MKL	Pathogenic	0.98	D
Vest4		0.14
GERP RS		5.9

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: rs2051325243; hg19: chr15-83518468;