1-177933521-T-C

Position:

• chr1-177933521-T-C

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 2P and 6B. PM2 BP4_Strong BP6_Moderate

The NM_033127.4(SEC16B):​c.2687A>G​(p.Gln896Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,582 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: SEC16B NM_033127.4 missense
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -0.389

Genes affected

SEC16B (HGNC:30301): (SEC16 homolog B, endoplasmic reticulum export factor) SEC16B is a mammalian homolog of S. cerevisiae Sec16 that is required for organization of transitional endoplasmic reticulum (ER) sites and protein export (Bhattacharyya and Glick, 2007 [PubMed 17192411]).[supplied by OMIM, Jun 2009]

CRYZL2P-SEC16B (HGNC:53757): (CRYZL2P-SEC16B readthrough) This locus represents naturally occurring read-through transcription between the neighboring CRYZL2P (crystallin zeta like 2 pseudogene) and SEC16B (SEC16 homolog B, endoplasmic reticulum export factor) genes on chromosome 1. The readthrough transcript encodes a protein that shares sequence identity with the downstream gene product. [provided by RefSeq, Oct 2017]

SEC16B (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.056688756).
• BP6: Variant 1-177933521-T-C is Benign according to our data. Variant chr1-177933521-T-C is described in ClinVar as [Likely_benign]. Clinvar id is 3159227.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SEC16B	NM_033127.4	c.2687A>G	p.Gln896Arg	missense_variant	21/26	ENST00000308284.11	NP_149118.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SEC16B	ENST00000308284.11	c.2687A>G	p.Gln896Arg	missense_variant	21/26	1	NM_033127.4	ENSP00000308339.6

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461582 Hom.: 0 Cov.: 33 AF XY: 0.00000138 AC XY: 1 AN XY: 727050

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 16, 2024

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.072
BayesDel_addAF	Benign	-0.42	T
BayesDel_noAF	Benign	-0.85
CADD	Benign	0.048
DANN	Benign	0.27
DEOGEN2	Benign	0.0042	T
Eigen	Benign	-1.9
Eigen_PC	Benign	-1.9
FATHMM_MKL	Benign	0.028	N
LIST_S2	Benign	0.24	T
M_CAP	Benign	0.0025	T
MetaRNN	Benign	0.057	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.83	L
PrimateAI	Benign	0.17	T
PROVEAN	Benign	-0.74	N
REVEL	Benign	0.0050
Sift	Benign	0.18	T
Sift4G	Benign	0.46	T
Polyphen		0.0010	B
Vest4		0.068
MutPred		0.28		Gain of MoRF binding (P = 0.0215);
MVP		0.061
MPC		0.041
ClinPred		0.071	T
GERP RS		-6.2
Varity_R		0.043
gMVP		0.12

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: rs1650610423; hg19: chr1-177902656;