1-197101898-C-T

Position:

• chr1-197101898-C-T

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_Strong BP6_Very_Strong BP7 BS1 BS2

The NM_018136.5(ASPM):​c.7353G>A​(p.Leu2451Leu) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00222 in 1,612,794 control chromosomes in the GnomAD database, including 36 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0089 (18 hom., cov: 32)
  • Exomes 𝑓: 0.0015 (18 hom.)
• Consequence: ASPM NM_018136.5 synonymous
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:7
• Conservation: PhyloP100: 0.0510

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]

ASPM (HGNC:):

ACMG classification

Verdict is Benign. Variant got -21 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.69).
• BP6: Variant 1-197101898-C-T is Benign according to our data. Variant chr1-197101898-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 157868.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-197101898-C-T is described in Lovd as [Likely_benign].
• BP7: Synonymous conserved (PhyloP=0.051 with no splicing effect.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00893 (1356/151824) while in subpopulation AFR AF= 0.029 (1203/41452). AF 95% confidence interval is 0.0277. There are 18 homozygotes in gnomad4. There are 631 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 18 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ASPM	NM_018136.5	c.7353G>A	p.Leu2451Leu	synonymous_variant	18/28	ENST00000367409.9	NP_060606.3
ASPM	NM_001206846.2	c.4066-5734G>A		intron_variant			NP_001193775.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ASPM	ENST00000367409.9	c.7353G>A	p.Leu2451Leu	synonymous_variant	18/28	1	NM_018136.5	ENSP00000356379.4

Frequencies

GnomAD3 genomes AF: 0.00873 AC: 1324 AN: 151706 Hom.: 14 Cov.: 32

Gnomad AFR AF: 0.0284

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00250

Gnomad ASJ AF: 0.0156

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00633

Gnomad NFE AF: 0.000663

Gnomad OTH AF: 0.00576

GnomAD3 exomes AF: 0.00308 AC: 772 AN: 250248 Hom.: 12 AF XY: 0.00262 AC XY: 354 AN XY: 135260

Gnomad AFR exome AF: 0.0273

Gnomad AMR exome AF: 0.00209

Gnomad ASJ exome AF: 0.0153

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000261

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000709

Gnomad OTH exome AF: 0.00263

GnomAD4 exome AF: 0.00153 AC: 2228 AN: 1460970 Hom.: 18 Cov.: 42 AF XY: 0.00149 AC XY: 1081 AN XY: 726784

Gnomad4 AFR exome AF: 0.0293

Gnomad4 AMR exome AF: 0.00226

Gnomad4 ASJ exome AF: 0.0158

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000313

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000359

Gnomad4 OTH exome AF: 0.00441

GnomAD4 genome AF: 0.00893 AC: 1356 AN: 151824 Hom.: 18 Cov.: 32 AF XY: 0.00850 AC XY: 631 AN XY: 74214

Gnomad4 AFR AF: 0.0290

Gnomad4 AMR AF: 0.00250

Gnomad4 ASJ AF: 0.0156

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000663

Gnomad4 OTH AF: 0.00570

Alfa AF: 0.00542 Hom.: 5

Bravo AF: 0.00989

Asia WGS AF: 0.00433 AC: 15 AN: 3478

EpiCase AF: 0.00147

EpiControl AF: 0.00142

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:7

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:3

Benign, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	Feb 27, 2013	- -
Benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Sep 30, 2024	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Mar 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. -

Microcephaly 5, primary, autosomal recessive Benign:2

Likely 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 likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -
Benign, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Apr 11, 2023	- -

not provided Benign:2

Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 26, 2024	- -
Likely benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.69
CADD	Benign	0.44
DANN	Benign	0.56
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6

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

Other links and lift over

dbSNP: rs111487086; hg19: chr1-197071028;