1-197146215-C-T

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_018136.5(ASPM):c.223G>A(p.Ala75Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00149 in 1,614,126 control chromosomes in the GnomAD database, including 29 homozygotes. In-silico tool predicts a benign outcome for this variant. 13/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0082 (19 hom., cov: 31)
  • Exomes 𝑓: 0.00078 (10 hom.)
• Consequence: ASPM NM_018136.5 missense
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts U:2 B:9
• Conservation: PhyloP100: 0.815

Genes affected

ASPM (HGNC:19048): (assembly factor for spindle microtubules) This gene is the human ortholog of the Drosophila melanogaster 'abnormal spindle' gene (asp), which is essential for normal mitotic spindle function in embryonic neuroblasts. Studies in mouse also suggest a role of this gene in mitotic spindle regulation, with a preferential role in regulating neurogenesis. Mutations in this gene are associated with microcephaly primary type 5. Multiple transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, May 2011]

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.0028880239).
• BP6: Variant 1-197146215-C-T is Benign according to our data. Variant chr1-197146215-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 157793.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00825 (1256/152244) while in subpopulation AFR AF= 0.0289 (1199/41538). AF 95% confidence interval is 0.0275. There are 19 homozygotes in gnomad4. There are 577 alleles in male gnomad4 subpopulation. Median coverage is 31. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd at 19 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ASPM	NM_018136.5	c.223G>A	p.Ala75Thr	missense_variant	1/28	ENST00000367409.9
ASPM	NM_001206846.2	c.223G>A	p.Ala75Thr	missense_variant	1/27

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ASPM	ENST00000367409.9	c.223G>A	p.Ala75Thr	missense_variant	1/28	1	NM_018136.5	P1

Frequencies

GnomAD3 genomes AF: 0.00825 AC: 1255 AN: 152124 Hom.: 19 Cov.: 31

Gnomad AFR AF: 0.0289

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00314

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: 0.0000294

Gnomad OTH AF: 0.00335

GnomAD3 exomes AF: 0.00236 AC: 594 AN: 251398 Hom.: 9 AF XY: 0.00166 AC XY: 226 AN XY: 135908

Gnomad AFR exome AF: 0.0286

Gnomad AMR exome AF: 0.00341

Gnomad ASJ exome AF: 0.0000992

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000440

Gnomad OTH exome AF: 0.000815

GnomAD4 exome AF: 0.000781 AC: 1142 AN: 1461882 Hom.: 10 Cov.: 31 AF XY: 0.000641 AC XY: 466 AN XY: 727238

Gnomad4 AFR exome AF: 0.0263

Gnomad4 AMR exome AF: 0.00320

Gnomad4 ASJ exome AF: 0.0000383

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000464

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000153

Gnomad4 OTH exome AF: 0.00142

GnomAD4 genome AF: 0.00825 AC: 1256 AN: 152244 Hom.: 19 Cov.: 31 AF XY: 0.00775 AC XY: 577 AN XY: 74432

Gnomad4 AFR AF: 0.0289

Gnomad4 AMR AF: 0.00314

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000294

Gnomad4 OTH AF: 0.00331

Alfa AF: 0.00154 Hom.: 4

Bravo AF: 0.00926

ESP6500AA AF: 0.0297 AC: 131

ESP6500EA AF: 0.00 AC: 0

ExAC AF: 0.00291 AC: 353

Asia WGS AF: 0.000866 AC: 3 AN: 3478

EpiCase AF: 0.00

EpiControl AF: 0.000119

ClinVar

Significance: Benign/Likely benign

Submissions summary: Uncertain:2 Benign:9

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Uncertain:2 Benign:3

Uncertain significance, no assertion criteria provided	clinical testing	Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)	-	- -
Likely benign, criteria provided, single submitter	clinical testing	Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics	Apr 27, 2017	- -
Benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Jan 25, 2018	- -
Benign, criteria provided, single submitter	clinical testing	Invitae	Jan 18, 2024	- -
Uncertain significance, no assertion criteria provided	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	-	- -

not specified Benign:3

Benign, criteria provided, single submitter	clinical testing	GeneDx	Feb 09, 2016	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -
Benign, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Dec 18, 2014	- -
Benign, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	Jul 30, 2013	- -

Microcephaly 5, primary, autosomal recessive Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Apr 11, 2023	- -
Benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

ASPM-related disorder Benign:1

Benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

May 09, 2019

This variant is classified as benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	-0.51	T
BayesDel_noAF	Benign	-0.48
Cadd	Benign	15
Dann	Uncertain	1.0
DEOGEN2	Benign	0.030	T;.
Eigen	Benign	-0.87
Eigen_PC	Benign	-0.91
FATHMM_MKL	Benign	0.16	N
LIST_S2	Benign	0.73	T;T
MetaRNN	Benign	0.0029	T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	2.0	M;M
MutationTaster	Benign	1.0	N;N
PrimateAI	Benign	0.37	T
PROVEAN	Benign	-1.1	N;N
REVEL	Benign	0.025
Sift	Benign	0.24	T;T
Sift4G	Benign	0.28	T;T
Polyphen		0.042	B;.
Vest4		0.13
MVP		0.42
ClinPred		0.0088	T
GERP RS		2.3
Varity_R		0.039
gMVP		0.19

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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

Other links and lift over

dbSNP: rs61995747; hg19: chr1-197115345;