rs80058948

chr1-197122609-C-A

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BA1

The NM_018136.5(ASPM):c.3391-14G>T variant causes a splice polypyrimidine tract, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00342 in 1,582,452 control chromosomes in the GnomAD database, including 175 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.018 (85 hom., cov: 32)
  • Exomes 𝑓: 0.0018 (90 hom.)
• Consequence: ASPM NM_018136.5 splice_polypyrimidine_tract, intron
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:5
• Conservation: PhyloP100: -2.30

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 (BayesDel_noAF=-0.58).
• BP6: Variant 1-197122609-C-A is Benign according to our data. Variant chr1-197122609-C-A is described in ClinVar as [Benign]. Clinvar id is 157804.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-197122609-C-A is described in Lovd as [Benign].
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.0611 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ASPM	NM_018136.5	c.3391-14G>T		splice_polypyrimidine_tract_variant, intron_variant		ENST00000367409.9
ASPM	NM_001206846.2	c.3391-14G>T		splice_polypyrimidine_tract_variant, intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ASPM	ENST00000367409.9	c.3391-14G>T		splice_polypyrimidine_tract_variant, intron_variant		1	NM_018136.5	P1

Frequencies

GnomAD3 genomes AF: 0.0183 AC: 2783 AN: 152016 Hom.: 85 Cov.: 32

Gnomad AFR AF: 0.0634

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00813

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: 0.000162

Gnomad OTH AF: 0.0125

GnomAD3 exomes AF: 0.00488 AC: 997 AN: 204240 Hom.: 26 AF XY: 0.00335 AC XY: 365 AN XY: 108920

Gnomad AFR exome AF: 0.0697

Gnomad AMR exome AF: 0.00305

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000380

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000104

Gnomad OTH exome AF: 0.00247

GnomAD4 exome AF: 0.00184 AC: 2628 AN: 1430318 Hom.: 90 Cov.: 34 AF XY: 0.00153 AC XY: 1082 AN XY: 709414

Gnomad4 AFR exome AF: 0.0672

Gnomad4 AMR exome AF: 0.00345

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000603

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000577

Gnomad4 OTH exome AF: 0.00353

GnomAD4 genome AF: 0.0183 AC: 2780 AN: 152134 Hom.: 85 Cov.: 32 AF XY: 0.0168 AC XY: 1252 AN XY: 74392

Gnomad4 AFR AF: 0.0631

Gnomad4 AMR AF: 0.00812

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000162

Gnomad4 OTH AF: 0.0123

Alfa AF: 0.00995 Hom.: 6

Bravo AF: 0.0215

Asia WGS AF: 0.00318 AC: 11 AN: 3478

ClinVar

Significance: Benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:2

Benign, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	Mar 05, 2014	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Mar 22, 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

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. -

not provided Benign:1

Benign, criteria provided, single submitter

clinical testing

Invitae

Jan 25, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.58
Cadd	Benign	5.2
Dann	Benign	0.77

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: rs80058948; hg19: chr1-197091739;