chr8-6588265-C-A

Variant names:

• chr8-6588265-C-A
• rs2442581
• NM_024596.5:c.2215-33189C>A

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_024596.5(MCPH1):​c.2215-33189C>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.243 in 152,042 control chromosomes in the GnomAD database, including 4,734 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.24 (4734 hom., cov: 32)
• Consequence: MCPH1 NM_024596.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.14
• Publications: 3 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: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.8).
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.399 is higher than 0.05.

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.2215-33189C>A		intron	N/A	NP_078872.3
	MCPH1	NM_001322042.2		c.2215-33189C>A		intron	N/A	NP_001308971.2
	MCPH1	NM_001410917.1		c.2215-33189C>A		intron	N/A	NP_001397846.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MCPH1	ENST00000344683.10	TSL:1 MANE Select	c.2215-33189C>A		intron	N/A	ENSP00000342924.5
	MCPH1	ENST00000692836.1		c.2215-33189C>A		intron	N/A	ENSP00000509971.1
	MCPH1	ENST00000689348.1		c.2215-33189C>A		intron	N/A	ENSP00000509554.1

Frequencies

GnomAD3 genomes AF: 0.243 AC: 36858 AN: 151924 Hom.: 4727 Cov.: 32

Gnomad AFR AF: 0.156

Gnomad AMI AF: 0.183

Gnomad AMR AF: 0.243

Gnomad ASJ AF: 0.288

Gnomad EAS AF: 0.414

Gnomad SAS AF: 0.248

Gnomad FIN AF: 0.325

Gnomad MID AF: 0.206

Gnomad NFE AF: 0.267

Gnomad OTH AF: 0.260

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.243 AC: 36889 AN: 152042 Hom.: 4734 Cov.: 32 AF XY: 0.246 AC XY: 18298 AN XY: 74290

African (AFR) AF: 0.157 AC: 6499 AN: 41494

American (AMR) AF: 0.244 AC: 3725 AN: 15286

Ashkenazi Jewish (ASJ) AF: 0.288 AC: 999 AN: 3470

East Asian (EAS) AF: 0.414 AC: 2137 AN: 5162

South Asian (SAS) AF: 0.248 AC: 1190 AN: 4806

European-Finnish (FIN) AF: 0.325 AC: 3425 AN: 10548

Middle Eastern (MID) AF: 0.194 AC: 57 AN: 294

European-Non Finnish (NFE) AF: 0.267 AC: 18148 AN: 67960

Other (OTH) AF: 0.257 AC: 542 AN: 2110

Alfa AF: 0.259 Hom.: 20150

Bravo AF: 0.233

Asia WGS AF: 0.318 AC: 1107 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.80
CADD	Benign	5.0
DANN	Benign	0.71
PhyloP100		1.1
Mutation Taster		=100/0	polymorphism (auto)

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: rs2442581; hg19: chr8-6445786;