4-99583418-G-T

Position:

• chr4-99583418-G-T

Variant summary

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

The NM_001386140.1(MTTP):​c.294G>T​(p.Glu98Asp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in same amino acid change has been previously reported as Benignin Lovd.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MTTP NM_001386140.1 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.225

Genes affected

MTTP (HGNC:7467): (microsomal triglyceride transfer protein) MTP encodes the large subunit of the heterodimeric microsomal triglyceride transfer protein. Protein disulfide isomerase (PDI) completes the heterodimeric microsomal triglyceride transfer protein, which has been shown to play a central role in lipoprotein assembly. Mutations in MTP can cause abetalipoproteinemia. [provided by RefSeq, Jul 2008]

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=0.17571804).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MTTP	NM_001386140.1	c.294G>T	p.Glu98Asp	missense_variant	3/18	ENST00000265517.10	NP_001373069.1
MTTP	NM_000253.4	c.294G>T	p.Glu98Asp	missense_variant	4/19		NP_000244.2
MTTP	NM_001300785.2	c.45G>T	p.Glu15Asp	missense_variant	3/18		NP_001287714.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MTTP	ENST00000265517.10	c.294G>T	p.Glu98Asp	missense_variant	3/18	1	NM_001386140.1	ENSP00000265517	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

TwinsUK AF: 0.000270 AC: 1

ALSPAC AF: 0.00 AC: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.093
BayesDel_addAF	Benign	-0.23	T
BayesDel_noAF	Benign	-0.56
CADD	Benign	16
DANN	Uncertain	0.98
DEOGEN2	Benign	0.017	T;.;T;T;.
Eigen	Benign	-0.43
Eigen_PC	Benign	-0.31
FATHMM_MKL	Benign	0.51	D
LIST_S2	Benign	0.55	T;T;.;T;T
M_CAP	Benign	0.011	T
MetaRNN	Benign	0.18	T;T;T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Uncertain	2.3	.;.;M;M;M
MutationTaster	Benign	1.0	P;P;P;P
PrimateAI	Benign	0.29	T
PROVEAN	Benign	-0.86	N;N;N;N;N
REVEL	Benign	0.030
Sift	Benign	0.12	T;T;T;T;T
Sift4G	Benign	0.40	T;T;T;T;T
Polyphen		0.20, 0.71	.;B;P;P;.
Vest4		0.049, 0.046, 0.044
MutPred		0.28		.;Gain of glycosylation at S127 (P = 0.0253);.;.;.;
MVP		0.69
MPC		0.22
ClinPred		0.25	T
GERP RS		2.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.050
gMVP		0.29

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: rs2306986; hg19: chr4-100504575;