rs755752015

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 2P and 7B. PM1BP4_ModerateBS1_SupportingBS2

The NM_012064.4(MIP):c.713A>C(p.Lys238Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000168 in 1,614,006 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. K238K) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000079 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00018 ( 0 hom. )

Consequence

MIP
NM_012064.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 3.24

Variant links:

Genes affected

MIP (HGNC:7103): (major intrinsic protein of lens fiber) Major intrinsic protein is a member of the water-transporting aquaporins as well as the original member of the MIP family of channel proteins. The function of the fiber cell membrane protein encoded by this gene is undetermined, yet this protein is speculated to play a role in intracellular communication. The MIP protein is expressed in the ocular lens and is required for correct lens function. This gene has been mapped among aquaporins AQP2, AQP5, and AQP6, in a potential gene cluster at 12q13. [provided by RefSeq, Jul 2008]

MIP links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -5 ACMG points.

PM1

In a chain Lens fiber major intrinsic protein (size 262) in uniprot entity MIP_HUMAN there are 14 pathogenic changes around while only 3 benign (82%) in NM_012064.4

BP4

Computational evidence support a benign effect (MetaRNN=0.13515371).

BS1

Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.0000789 (12/152166) while in subpopulation NFE AF= 0.000132 (9/68026). AF 95% confidence interval is 0.000068. There are 0 homozygotes in gnomad4. There are 5 alleles in male gnomad4 subpopulation. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High AC in GnomAd at 12 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
MIP	NM_012064.4 linkuse as main transcript	c.713A>C	p.Lys238Thr	missense_variant	4/4	ENST00000652304.1
MIP	XM_011538354.2 linkuse as main transcript	c.428A>C	p.Lys143Thr	missense_variant	6/6
MIP	XM_017019306.2 linkuse as main transcript	c.356A>C	p.Lys119Thr	missense_variant	4/4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Appris
MIP	ENST00000652304.1 linkuse as main transcript	c.713A>C	p.Lys238Thr	missense_variant	4/4	NM_012064.4	P1
MIP	ENST00000648442.1 linkuse as main transcript	n.846A>C		non_coding_transcript_exon_variant	6/6
MIP	ENST00000650166.1 linkuse as main transcript			downstream_gene_variant

Frequencies

GnomAD3 genomes

AF:

0.0000789

AC:

AN:

152166

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000724

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000132

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000318

AC:

AN:

251464

Hom.:

AF XY:

0.0000294

AC XY:

AN XY:

135918

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000703

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000177

AC:

259

AN:

1461840

Hom.:

Cov.:

AF XY:

0.000176

AC XY:

128

AN XY:

727214

show subpopulations

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:

0.000231

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000789

AC:

AN:

152166

Hom.:

Cov.:

AF XY:

0.0000673

AC XY:

AN XY:

74338

show subpopulations

Gnomad4 AFR

AF:

0.0000724

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000132

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000965

Hom.:

Bravo

AF:

0.0000756

ExAC

AF:

0.0000165

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.000237

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 06, 2021

The c.713A>C (p.K238T) alteration is located in exon 4 (coding exon 4) of the MIP gene. This alteration results from a A to C substitution at nucleotide position 713, causing the lysine (K) at amino acid position 238 to be replaced by a threonine (T). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Cataract 15 multiple types

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Aug 24, 2021

This sequence change replaces lysine with threonine at codon 238 of the MIP protein (p.Lys238Thr). The lysine residue is moderately conserved and there is a moderate physicochemical difference between lysine and threonine. This variant is present in population databases (rs755752015, ExAC 0.003%). This variant has not been reported in the literature in individuals affected with MIP-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.18

BayesDel_addAF

Benign

-0.099

BayesDel_noAF

Benign

-0.19

Cadd

Benign

Dann

Benign

0.92

DEOGEN2

Uncertain

0.43

Eigen

Benign

-0.77

Eigen_PC

Benign

-0.69

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Benign

0.72

M_CAP

Benign

0.080

MetaRNN

Benign

0.14

MetaSVM

Benign

-0.44

MutationAssessor

Uncertain

2.0

MutationTaster

Benign

0.98

PrimateAI

Benign

0.46

PROVEAN

Uncertain

-2.7

REVEL

Uncertain

0.32

Sift

Benign

0.29

Sift4G

Benign

0.19

Polyphen

0.039

Vest4

0.31

MVP

0.56

MPC

0.84

ClinPred

0.10

GERP RS

2.2

Varity_R

0.18

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over