18-32204234-G-T

Position:

• chr18-32204234-G-T

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_005925.3(MEP1B):​c.421G>T​(p.Gly141Trp) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: MEP1B NM_005925.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.95

Genes affected

MEP1B (HGNC:7020): (meprin A subunit beta) Meprins are multidomain zinc metalloproteases that are highly expressed in mammalian kidney and intestinal brush border membranes, and in leukocytes and certain cancer cells. They are involved in the hydrolysis of a variety of peptide and protein substrates, and have been implicated in cancer and intestinal inflammation. Mature meprins are oligomers of evolutionarily related, but separately encoded alpha and/or beta subunits. Homooligomers of alpha subunit are secreted, whereas, oligomers containing the beta subunit are plasma membrane-bound. This gene encodes the beta subunit. Targeted disruption of this gene in mice affects embryonic viability, renal gene expression profiles, and distribution of the membrane-associated alpha subunit in kidney and intestine. [provided by RefSeq, Oct 2011]

GAREM1 (HGNC:26136): (GRB2 associated regulator of MAPK1 subtype 1) This gene encodes an adaptor protein which functions in the epidermal growth factor (EGF) receptor-mediated signaling pathway. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Oct 2011]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.983

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MEP1B	NM_005925.3	c.421G>T	p.Gly141Trp	missense_variant	7/15	ENST00000269202.11	NP_005916.2
MEP1B	NM_001308171.2	c.421G>T	p.Gly141Trp	missense_variant	7/15		NP_001295100.1
MEP1B	XM_011526013.3	c.421G>T	p.Gly141Trp	missense_variant	7/14		XP_011524315.1
MEP1B	XM_011526014.3	c.421G>T	p.Gly141Trp	missense_variant	7/13		XP_011524316.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MEP1B	ENST00000269202.11	c.421G>T	p.Gly141Trp	missense_variant	7/15	1	NM_005925.3	ENSP00000269202	P4
MEP1B	ENST00000581447.1	c.421G>T	p.Gly141Trp	missense_variant	7/15	1		ENSP00000463280	A1
GAREM1	ENST00000583696.1	c.66-67774C>A		intron_variant		3		ENSP00000464185
MEP1B	ENST00000581184.5	n.466G>T		non_coding_transcript_exon_variant	7/7	3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1454044 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 722284

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: 0.00

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

Sep 13, 2022

The c.421G>T (p.G141W) alteration is located in exon 7 (coding exon 7) of the MEP1B gene. This alteration results from a G to T substitution at nucleotide position 421, causing the glycine (G) at amino acid position 141 to be replaced by a tryptophan (W). 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	Pathogenic	0.95
BayesDel_addAF	Pathogenic	0.38	D
BayesDel_noAF	Pathogenic	0.31
CADD	Pathogenic	31
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.78	D;D;D
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	1.0
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.95	D;D;D
M_CAP	Uncertain	0.11	D
MetaRNN	Pathogenic	0.98	D;D;D
MetaSVM	Uncertain	0.46	D
MutationAssessor	Pathogenic	4.4	.;H;.
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.61	T
PROVEAN	Pathogenic	-8.0	.;D;.
REVEL	Pathogenic	0.79
Sift	Pathogenic	0.0	.;D;.
Sift4G	Pathogenic	0.0	D;D;D
Polyphen		1.0	.;D;.
Vest4		0.93, 0.91
MutPred		0.84		.;Loss of disorder (P = 0.0311);Loss of disorder (P = 0.0311);
MVP		0.87
MPC		0.58
ClinPred		1.0	D
GERP RS		5.9
Varity_R		0.91
gMVP		0.96

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: chr18-29784197;