chr8-6445217-G-C

Variant names:

• chr8-6445217-G-C
• rs146586991
• NM_024596.5:c.1495G>C

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_024596.5(MCPH1):​c.1495G>C​(p.Val499Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000657 in 152,248 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/22 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 variant affecting the same amino acid position, but resulting in a different missense (i.e. V499M) has been classified as Likely benign.

• Frequency: Genomes: 𝑓 0.0000066 (0 hom., cov: 33)
• Consequence: MCPH1 NM_024596.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -3.06
• Publications: 5 publications found

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 Gene-Disease associations (from GenCC):

• microcephaly 1, primary, autosomal recessive

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
• microcephaly with intellectual disability

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• autosomal recessive primary microcephaly

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• hereditary breast carcinoma

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen
• familial ovarian cancer

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.021775454).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_024596.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MCPH1	NM_024596.5	MANE Select	c.1495G>C	p.Val499Leu	missense	Exon 8 of 14	NP_078872.3
	MCPH1	NM_001322042.2		c.1495G>C	p.Val499Leu	missense	Exon 8 of 15	NP_001308971.2
	MCPH1	NM_001410917.1		c.1495G>C	p.Val499Leu	missense	Exon 8 of 14	NP_001397846.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MCPH1	ENST00000344683.10	TSL:1 MANE Select	c.1495G>C	p.Val499Leu	missense	Exon 8 of 14	ENSP00000342924.5
	MCPH1	ENST00000519480.6	TSL:1	c.1495G>C	p.Val499Leu	missense	Exon 8 of 8	ENSP00000430962.1
	MCPH1	ENST00000692836.1		c.1495G>C	p.Val499Leu	missense	Exon 8 of 13	ENSP00000509971.1

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152248 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000654

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: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 46

GnomAD4 genome AF: 0.00000657 AC: 1 AN: 152248 Hom.: 0 Cov.: 33 AF XY: 0.0000134 AC XY: 1 AN XY: 74382

African (AFR) AF: 0.00 AC: 0 AN: 41458

American (AMR) AF: 0.0000654 AC: 1 AN: 15286

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5202

South Asian (SAS) AF: 0.00 AC: 0 AN: 4838

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10622

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 68048

Other (OTH) AF: 0.00 AC: 0 AN: 2094

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Benign	-0.44	T
BayesDel_noAF	Benign	-0.87
CADD	Benign	0.0010
DANN	Benign	0.51
DEOGEN2	Benign	0.055	T
Eigen	Benign	-2.3
Eigen_PC	Benign	-2.4
FATHMM_MKL	Benign	0.0087	N
M_CAP	Benign	0.0029	T
MetaRNN	Benign	0.022	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.1	L
PhyloP100		-3.1
PrimateAI	Benign	0.24	T
PROVEAN	Benign	0.050	N
REVEL	Benign	0.029
Sift	Benign	0.47	T
Sift4G	Benign	0.40	T
Polyphen		0.0020	B
Vest4		0.012
MutPred		0.20		Gain of catalytic residue at V499 (P = 0.0966)
MVP		0.095
ClinPred		0.046	T
GERP RS		-11
Varity_R		0.019
gMVP		0.073
Mutation Taster		=97/3	polymorphism

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

Other links and lift over

dbSNP: rs146586991; hg19: chr8-6302738;