chr4-139266790-C-T

Position:

• chr4-139266790-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_032623.4(MGARP):​c.532G>A​(p.Glu178Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000958 in 1,461,894 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000096 (0 hom.)
• Consequence: MGARP NM_032623.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.38

Genes affected

MGARP (HGNC:29969): (mitochondria localized glutamic acid rich protein) Predicted to be involved in several processes, including axonal transport; cellular response to hormone stimulus; and protein targeting to mitochondrion. Located in mitochondrion. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.2079454).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MGARP	NM_032623.4	c.532G>A	p.Glu178Lys	missense_variant	4/4	ENST00000398955.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MGARP	ENST00000398955.2	c.532G>A	p.Glu178Lys	missense_variant	4/4	1	NM_032623.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000958 AC: 14 AN: 1461894 Hom.: 0 Cov.: 31 AF XY: 0.00000688 AC XY: 5 AN XY: 727248

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: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000126

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

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

Nov 16, 2021

The c.532G>A (p.E178K) alteration is located in exon 4 (coding exon 4) of the MGARP gene. This alteration results from a G to A substitution at nucleotide position 532, causing the glutamic acid (E) at amino acid position 178 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	0.099
BayesDel_addAF	Benign	-0.15	T
BayesDel_noAF	Benign	-0.45
CADD	Benign	21
DANN	Uncertain	1.0
DEOGEN2	Benign	0.060	T
Eigen	Benign	-0.34
Eigen_PC	Benign	-0.43
FATHMM_MKL	Benign	0.18	N
LIST_S2	Benign	0.66	T
M_CAP	Benign	0.021	T
MetaRNN	Benign	0.21	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Uncertain	2.2	M
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.33	T
PROVEAN	Uncertain	-2.7	D
REVEL	Benign	0.066
Sift	Uncertain	0.017	D
Sift4G	Uncertain	0.011	D
Polyphen		0.87	P
Vest4		0.12
MutPred		0.44		Gain of loop (P = 0.0013);
MVP		0.31
MPC		0.38
ClinPred		0.94	D
GERP RS		3.6
Varity_R		0.20
gMVP		0.20

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs754607391; hg19: chr4-140187944;