4-127921896-G-T

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM2PP3_ModeratePP5

The NM_001371596.2(MFSD8):c.1066C>A(p.Pro356Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000041 in 1,461,846 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. P356P) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000041 ( 0 hom. )

Consequence

MFSD8
NM_001371596.2 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1U:2

Conservation

PhyloP100: 8.46

Publications

2 publications found

Variant links:

Genes affected

MFSD8 (HGNC:28486): (major facilitator superfamily domain containing 8) This gene encodes a ubiquitous integral membrane protein that contains a transporter domain and a major facilitator superfamily (MFS) domain. Other members of the major facilitator superfamily transport small solutes through chemiosmotic ion gradients. The substrate transported by this protein is unknown. The protein likely localizes to lysosomal membranes. Mutations in this gene are correlated with a variant form of late infantile-onset neuronal ceroid lipofuscinoses (vLINCL). [provided by RefSeq, Oct 2008]

MFSD8 Gene-Disease associations (from GenCC):

neuronal ceroid lipofuscinosis
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
neuronal ceroid lipofuscinosis 7
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp, Orphanet, G2P
macular dystrophy with central cone involvement
Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)

MFSD8 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 5 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.881

PP5

Variant 4-127921896-G-T is Pathogenic according to our data. Variant chr4-127921896-G-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 581405.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=1, Likely_pathogenic=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MFSD8	NM_001371596.2 link	c.1066C>A	p.Pro356Thr	missense_variant	Exon 10 of 12	ENST00000641686.2	NP_001358525.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MFSD8	ENST00000641686.2 link	c.1066C>A	p.Pro356Thr	missense_variant	Exon 10 of 12		NM_001371596.2	ENSP00000493218.2		Q8NHS3-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.0000159

AC:

AN:

251290

AF XY:

0.0000221

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000264

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000410

AC:

AN:

1461846

Hom.:

Cov.:

AF XY:

0.00000550

AC XY:

AN XY:

727224

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.0000224

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

39696

South Asian (SAS)

AF:

0.00

AC:

AN:

86256

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53404

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00000450

AC:

AN:

1111996

Other (OTH)

AF:

0.00

AC:

AN:

60390

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.417

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000935

Hom.:

ExAC

AF:

0.0000247

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1Uncertain:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Neuronal ceroid lipofuscinosis 7

Pathogenic:1Uncertain:1

Nov 08, 2020

Mendelics

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The substitution p.Pro356Thr is a highly conserved and rare variant (found in heterozygous state in 4 among 251290 alleles in GnomAD v2.0). It was seen in a homozygous state in 1 and in a compound heterozygous state in 2 patients with CLN7. We classify this variant as likely pathogenic -

Sep 01, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces proline, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 356 of the MFSD8 protein (p.Pro356Thr). This variant is present in population databases (rs756204684, gnomAD 0.003%). This missense change has been observed in individual(s) with neuronal ceroid lipofuscinosis type 7 (PMID: 31489614). ClinVar contains an entry for this variant (Variation ID: 581405). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Late-infantile neuronal ceroid lipofuscinosis

Uncertain:1

Nov 11, 2019

Natera, Inc.

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.71

BayesDel_addAF

Pathogenic

0.30

BayesDel_noAF

Pathogenic

0.28

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.48

T;T;.;.;.;.;.;.;.;.

Eigen

Pathogenic

0.84

Eigen_PC

Pathogenic

0.80

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Pathogenic

0.98

.;.;D;D;D;.;D;D;D;D

M_CAP

Benign

0.064

MetaRNN

Pathogenic

0.88

D;D;D;D;D;D;D;D;D;D

MetaSVM

Benign

-0.42

MutationAssessor

Pathogenic

3.2

M;M;.;.;.;.;.;.;.;.

PhyloP100

8.5

PrimateAI

Uncertain

0.60

PROVEAN

Pathogenic

-6.9

.;D;.;.;.;.;.;.;.;.

REVEL

Uncertain

0.60

Sift

Pathogenic

0.0

.;D;.;.;.;.;.;.;.;.

Sift4G

Pathogenic

0.0

.;D;.;.;.;.;.;.;.;.

Polyphen

1.0

D;D;.;.;.;.;.;.;.;.

Vest4

0.94

MutPred

0.71

Gain of helix (P = 0.132);Gain of helix (P = 0.132);.;.;.;.;.;.;.;Gain of helix (P = 0.132);

MVP

0.79

MPC

0.52

ClinPred

0.98

GERP RS

5.2

Varity_R

0.86

gMVP

0.95

Mutation Taster

=35/65

disease causing (ClinVar)

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.070

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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4-127921896-G-T

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over