16-29872264-A-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_001243332.2(SEZ6L2):c.2665T>A(p.Phe889Ile) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SEZ6L2 NM_001243332.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.17

Genes affected

SEZ6L2 (HGNC:30844): (seizure related 6 homolog like 2) This gene encodes a seizure-related protein that is localized on the cell surface. The gene is located in a region of chromosome 16p11.2 that is thought to contain candidate genes for autism spectrum disorders (ASD), though there is no evidence directly implicating this gene in ASD. Increased expression of this gene has been found in lung cancers, and the protein is therefore considered to be a novel prognostic marker for lung cancer. Alternative splicing of this gene results in multiple transcript variants. [provided by RefSeq, Aug 2011]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SEZ6L2	NM_001243332.2	c.2665T>A	p.Phe889Ile	missense_variant	17/18	ENST00000617533.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SEZ6L2	ENST00000617533.5	c.2665T>A	p.Phe889Ile	missense_variant	17/18	1	NM_001243332.2	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

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

Jun 14, 2023

The c.2626T>A (p.F876I) alteration is located in exon 16 (coding exon 16) of the SEZ6L2 gene. This alteration results from a T to A substitution at nucleotide position 2626, causing the phenylalanine (F) at amino acid position 876 to be replaced by an isoleucine (I). 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	Uncertain	0.56
BayesDel_addAF	Pathogenic	0.17	D
BayesDel_noAF	Uncertain	0.010
Cadd	Pathogenic	26
Dann	Uncertain	0.99
Eigen	Uncertain	0.44
Eigen_PC	Uncertain	0.52
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.91	D;D;D;D;D
M_CAP	Benign	0.016	T
MetaRNN	Benign	0.33	T;T;T;T;T
MetaSVM	Benign	-0.95	T
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Uncertain	0.68	T
PROVEAN	Benign	-0.070	N;N;N;N;.
REVEL	Benign	0.21
Sift	Uncertain	0.028	D;D;D;D;.
Sift4G	Benign	0.083	T;T;T;T;T
Polyphen		1.0, 0.95	.;D;P;.;.
Vest4		0.73
MutPred		0.29		.;.;Loss of ubiquitination at K873 (P = 0.0578);.;.;
MVP		0.54
MPC		0.49
ClinPred		0.92	D
GERP RS		5.4
Varity_R		0.10
gMVP		0.85

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.23		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.23		Position offset: -29

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: chr16-29883585;