NM_018136.5:c.1922-14C>G

Variant names:

• chr1-197139885-G-C
• rs189193044
• NM_018136.5:c.1922-14C>G

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_Strong BP6 BS1

The NM_018136.5(ASPM):​c.1922-14C>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000351 in 1,534,654 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.0018 (0 hom., cov: 33)
  • Exomes 𝑓: 0.00019 (0 hom.)
• Consequence: ASPM NM_018136.5 intron
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:2
• Conservation: PhyloP100: 0.106
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• microcephaly 5, primary, autosomal recessive

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
• autosomal recessive primary microcephaly

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, ClinGen

ACMG classification

Our verdict: Benign. The variant received -9 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.69).
• BP6: Variant 1-197139885-G-C is Benign according to our data. Variant chr1-197139885-G-C is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 157787.
• BS1: Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00184 (280/152276) while in subpopulation AFR AF = 0.00628 (261/41562). AF 95% confidence interval is 0.00565. There are 0 homozygotes in GnomAd4. There are 121 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_018136.5. 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
	ASPM	NM_018136.5	MANE Select	c.1922-14C>G		intron	N/A	NP_060606.3
	ASPM	NM_001206846.2		c.1922-14C>G		intron	N/A	NP_001193775.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ASPM	ENST00000367409.9	TSL:1 MANE Select	c.1922-14C>G		intron	N/A	ENSP00000356379.4
	ASPM	ENST00000294732.11	TSL:1	c.1922-14C>G		intron	N/A	ENSP00000294732.7
	ASPM	ENST00000680265.1		c.1922-14C>G		intron	N/A	ENSP00000505384.1

Frequencies

GnomAD3 genomes AF: 0.00183 AC: 278 AN: 152158 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00625

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000916

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: 0.0000588

Gnomad OTH AF: 0.000478

GnomAD2 exomes AF: 0.000583 AC: 146 AN: 250298 AF XY: 0.000362

Gnomad AFR exome AF: 0.00748

Gnomad AMR exome AF: 0.000638

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000177

Gnomad OTH exome AF: 0.000328

GnomAD4 exome AF: 0.000187 AC: 258 AN: 1382378 Hom.: 0 Cov.: 23 AF XY: 0.000150 AC XY: 104 AN XY: 692122

African (AFR) AF: 0.00617 AC: 196 AN: 31778

American (AMR) AF: 0.000538 AC: 24 AN: 44588

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25630

East Asian (EAS) AF: 0.00 AC: 0 AN: 39154

South Asian (SAS) AF: 0.00 AC: 0 AN: 84462

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53132

Middle Eastern (MID) AF: 0.000184 AC: 1 AN: 5422

European-Non Finnish (NFE) AF: 0.0000135 AC: 14 AN: 1040472

Other (OTH) AF: 0.000398 AC: 23 AN: 57740

GnomAD4 genome AF: 0.00184 AC: 280 AN: 152276 Hom.: 0 Cov.: 33 AF XY: 0.00163 AC XY: 121 AN XY: 74448

African (AFR) AF: 0.00628 AC: 261 AN: 41562

American (AMR) AF: 0.000915 AC: 14 AN: 15296

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

East Asian (EAS) AF: 0.00 AC: 0 AN: 5188

South Asian (SAS) AF: 0.00 AC: 0 AN: 4822

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10602

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.0000588 AC: 4 AN: 68016

Other (OTH) AF: 0.000473 AC: 1 AN: 2112

Alfa AF: 0.000684 Hom.: 0

Bravo AF: 0.00218

ClinVar

ClinVar submissions as Germline

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	-	2	not provided (2)
-	1	-	Microcephaly 5, primary, autosomal recessive (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.69
CADD	Benign	10
DANN	Benign	0.73
PhyloP100		0.11

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.16		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: rs189193044; hg19: chr1-197109015;