chr8-6444505-T-A

Variant names:

Variant summary

Our verdict is Benign. Variant got -9 ACMG points: 0P and 9B. BP4_StrongBS1_SupportingBS2

The NM_024596.5(MCPH1):c.783T>A(p.Asp261Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000501 in 1,614,176 control chromosomes in the GnomAD database, including 5 homozygotes. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00053 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00050 ( 5 hom. )

Consequence

MCPH1
NM_024596.5 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:8B:1

Conservation

PhyloP100: -1.58

Variant links:

Genes affected

MCPH1 (HGNC:6954): (microcephalin 1) This gene encodes a DNA damage response protein. The encoded protein may play a role in G2/M checkpoint arrest via maintenance of inhibitory phosphorylation of cyclin-dependent kinase 1. Mutations in this gene have been associated with primary autosomal recessive microcephaly 1 and premature chromosome condensation syndrome. Alternatively spliced transcript variants have been described. [provided by RefSeq, Feb 2010]

MCPH1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -9 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0067489743).

BS1

Variant frequency is greater than expected in population mid. gnomad4_exome allele frequency = 0.000497 (727/1461832) while in subpopulation MID AF= 0.00589 (34/5768). AF 95% confidence interval is 0.00434. There are 5 homozygotes in gnomad4_exome. There are 406 alleles in male gnomad4_exome subpopulation. Median coverage is 32. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High Homozygotes in GnomAdExome4 at 5 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MCPH1	NM_024596.5 link	c.783T>A	p.Asp261Glu	missense_variant	Exon 8 of 14	ENST00000344683.10	NP_078872.3	Q8NEM0-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MCPH1	ENST00000344683.10 link	c.783T>A	p.Asp261Glu	missense_variant	Exon 8 of 14	1	NM_024596.5	ENSP00000342924.5		Q8NEM0-1

Frequencies

GnomAD3 genomes

AF:

0.000532

AC:

AN:

152226

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000724

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00131

Gnomad ASJ

AF:

0.000864

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00166

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00633

Gnomad NFE

AF:

0.000647

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.000806

AC:

201

AN:

249470

Hom.:

AF XY:

0.000835

AC XY:

113

AN XY:

135340

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00122

Gnomad ASJ exome

AF:

0.00149

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00137

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000777

Gnomad OTH exome

AF:

0.00231

GnomAD4 exome

AF:

0.000497

AC:

727

AN:

1461832

Hom.:

Cov.:

AF XY:

0.000558

AC XY:

406

AN XY:

727218

show subpopulations

Gnomad4 AFR exome

AF:

0.0000896

Gnomad4 AMR exome

AF:

0.00112

Gnomad4 ASJ exome

AF:

0.00157

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00150

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000374

Gnomad4 OTH exome

AF:

0.000894

GnomAD4 genome

AF:

0.000532

AC:

AN:

152344

Hom.:

Cov.:

AF XY:

0.000591

AC XY:

AN XY:

74504

show subpopulations

Gnomad4 AFR

AF:

0.0000721

Gnomad4 AMR

AF:

0.00131

Gnomad4 ASJ

AF:

0.000864

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00166

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000647

Gnomad4 OTH

AF:

0.000473

Alfa

AF:

0.000804

Hom.:

Bravo

AF:

0.000612

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.000259

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000487

AC:

ExAC

AF:

0.000596

AC:

Asia WGS

AF:

0.000866

AC:

AN:

3478

EpiCase

AF:

0.000872

EpiControl

AF:

0.00148

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:8Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:4Benign:1

Jul 31, 2019

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In silico analysis, which includes protein predictors and evolutionary conservation, supports that this variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Mar 06, 2019

Athena Diagnostics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Aug 19, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces aspartic acid, which is acidic and polar, with glutamic acid, which is acidic and polar, at codon 261 of the MCPH1 protein (p.Asp261Glu). This variant is present in population databases (rs199700538, gnomAD 0.2%), and has an allele count higher than expected for a pathogenic variant. This missense change has been observed in individual(s) with MCPH1-related conditions (PMID: 20949544). ClinVar contains an entry for this variant (Variation ID: 211449). 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: "Not Available"; PolyPhen-2: "Benign"; Align-GVGD: "Not Available"). 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. -

Nov 01, 2024

CeGaT Center for Human Genetics Tuebingen

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

MCPH1: BP4, BS1 -

Breakthrough Genomics, Breakthrough Genomics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

Microcephaly 1, primary, autosomal recessive

Uncertain:2

Apr 27, 2017

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. However, the evidence from the literature, in combination with allele frequency data from public databases where available, was not sufficient to rule this variant in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

Oct 31, 2018

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not specified

Uncertain:1

Jun 17, 2015

Genetic Services Laboratory, University of Chicago

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Intellectual disability

Uncertain:1

Jan 01, 2019

Centre de Biologie Pathologie Génétique, Centre Hospitalier Universitaire de Lille

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

Benign

0.14

BayesDel_addAF

Benign

-0.69

BayesDel_noAF

Benign

-0.80

CADD

Benign

0.082

DANN

Benign

0.88

DEOGEN2

Benign

0.10

T;.;.

Eigen

Benign

-1.1

Eigen_PC

Benign

-1.3

FATHMM_MKL

Benign

0.026

M_CAP

Benign

0.0041

MetaRNN

Benign

0.0067

T;T;T

MetaSVM

Benign

-0.97

MutationAssessor

Uncertain

2.1

M;M;.

PrimateAI

Benign

0.27

PROVEAN

Benign

-0.69

N;N;N

REVEL

Benign

0.033

Sift

Benign

0.59

T;T;T

Sift4G

Benign

1.0

T;T;T

Polyphen

0.029

B;.;.

Vest4

0.024

MutPred

0.26

Gain of ubiquitination at K259 (P = 0.1215);Gain of ubiquitination at K259 (P = 0.1215);.;

MVP

0.27

ClinPred

0.029

GERP RS

-6.1

Varity_R

0.031

gMVP

0.13

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