14-39246977-G-T

Position:

• chr14-39246977-G-T

Variant summary

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

The ENST00000640607.2(MIA2):​c.403G>T​(p.Gly135Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000215 in 1,396,728 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 Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G135R) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: MIA2 ENST00000640607.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.08

Genes affected

MIA2 (HGNC:18432): (MIA SH3 domain ER export factor 2) This gene encodes s receptor in the endoplasmic reticulum, which plays a role in the export of large pre-chylomicrons and pre-very low density lipoproteins (pre-VLDLs). Three major classes of transcripts are generated from this gene- melanoma inhibitory activity 2-specific transcripts, cTAGE family member 5-specific transcripts and transcripts that include exons from both these transcript species (TANGO1-like or TALI). Additionally, alternative splicing in these transcripts results in multiple transcript variants encoding multiple isoforms. [provided by RefSeq, Sep 2016]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.058128744).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MIA2	NM_001329214.4	c.403G>T	p.Gly135Cys	missense_variant	4/29	ENST00000640607.2	NP_001316143.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MIA2	ENST00000640607.2	c.403G>T	p.Gly135Cys	missense_variant	4/29	1	NM_001329214.4	ENSP00000491014	P2
MIA2	ENST00000280082.4	c.403G>T	p.Gly135Cys	missense_variant	4/6	1		ENSP00000280082
MIA2	ENST00000553728.1	c.403G>T	p.Gly135Cys	missense_variant	4/28	5		ENSP00000452252	A2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000215 AC: 3 AN: 1396728 Hom.: 0 Cov.: 28 AF XY: 0.00 AC XY: 0 AN XY: 690674

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: 0.0000136

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000184

Gnomad4 OTH exome AF: 0.00

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

May 05, 2023

The c.403G>T (p.G135C) alteration is located in exon 4 (coding exon 4) of the MIA2 gene. This alteration results from a G to T substitution at nucleotide position 403, causing the glycine (G) at amino acid position 135 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	Benign	0.092
BayesDel_addAF	Benign	-0.25	T
BayesDel_noAF	Benign	-0.59
CADD	Benign	15
DANN	Benign	0.78
DEOGEN2	Benign	0.026	.;.;T
Eigen	Benign	-0.91
Eigen_PC	Benign	-0.91
FATHMM_MKL	Benign	0.038	N
LIST_S2	Benign	0.64	T;T;T
M_CAP	Benign	0.013	T
MetaRNN	Benign	0.058	T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.0	.;N;N
MutationTaster	Benign	1.0	N;N
PrimateAI	Benign	0.26	T
PROVEAN	Benign	-0.48	N;N;.
REVEL	Benign	0.020
Sift	Benign	0.11	T;D;.
Sift4G	Uncertain	0.056	T;D;.
Polyphen		0.33, 0.51	.;B;P
Vest4		0.13
MutPred		0.39		Loss of disorder (P = 0.0252);Loss of disorder (P = 0.0252);Loss of disorder (P = 0.0252);
MVP		0.18
MPC		0.026
ClinPred		0.13	T
GERP RS		2.9
Varity_R		0.079
gMVP		0.13

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: chr14-39716181;