chr2-121530873-C-G

Position:

• chr2-121530873-C-G

Variant summary

Our verdict is Benign. Variant got -10 ACMG points: 0P and 10B. BP4_Strong BP6 BS1 BS2_Supporting

The NM_001395891.1(CLASP1):​c.196-548G>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000572 in 683,854 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 Likely benign (no stars).

• Frequency:
  • Genomes: 𝑓 0.00042 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00062 (0 hom.)
• Consequence: CLASP1 NM_001395891.1 intron
• Clinical Significance: Likely benign no assertion criteria provided B:1
• Conservation: PhyloP100: -8.44

Genes affected

CLASP1 (HGNC:17088): (cytoplasmic linker associated protein 1) CLASPs, such as CLASP1, are nonmotor microtubule-associated proteins that interact with CLIPs (e.g., CLIP170; MIM 179838). CLASP1 is involved in the regulation of microtubule dynamics at the kinetochore and throughout the spindle (Maiato et al., 2003 [PubMed 12837247]).[supplied by OMIM, Mar 2008]

CLASP1-AS1 (HGNC:55328): (CLASP1 antisense RNA 1)

RNU4ATAC (HGNC:34016): (RNA, U4atac small nuclear) The small nuclear RNA (snRNA) encoded by this gene is part of the U12-dependent minor spliceosome complex. In addition to the encoded RNA, this ribonucleoprotein complex consists of U11, U12, U5, and U6atac snRNAs. The U12-dependent spliceosome acts on approximately 700 specific introns in the human genome. Defects in this gene are a cause of microcephalic osteodysplastic primordial dwarfism type 1 (MOPD). [provided by RefSeq, Jul 2011]

ACMG classification

Verdict is Benign. Variant got -10 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.9).
• BP6: Variant 2-121530873-C-G is Benign according to our data. Variant chr2-121530873-C-G is described in ClinVar as [Likely_benign]. Clinvar id is 3058046.Status of the report is no_assertion_criteria_provided, 0 stars.
• BS1: Variant frequency is greater than expected in population mid. gnomad4_exome allele frequency = 0.000615 (327/531562) while in subpopulation MID AF= 0.00294 (7/2384). AF 95% confidence interval is 0.00138. There are 0 homozygotes in gnomad4_exome. There are 192 alleles in male gnomad4_exome subpopulation. Median coverage is 0. This position pass quality control queck.
• BS2: High AC in GnomAd4 at 64 AD gene. Variant has AC lower than other variant known as pathogenic in the gene, so the strength is limited to Supporting.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CLASP1	NM_001395891.1	c.196-548G>C		intron_variant		ENST00000696935.1	NP_001382820.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CLASP1	ENST00000696935.1	c.196-548G>C		intron_variant			NM_001395891.1	ENSP00000512981.1

Frequencies

GnomAD3 genomes AF: 0.000421 AC: 64 AN: 152174 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000196

Gnomad ASJ AF: 0.00749

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000414

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.000397

Gnomad OTH AF: 0.00191

GnomAD3 exomes AF: 0.000907 AC: 116 AN: 127886 Hom.: 0 AF XY: 0.000958 AC XY: 67 AN XY: 69932

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000637

Gnomad ASJ exome AF: 0.00781

Gnomad EAS exome AF: 0.000291

Gnomad SAS exome AF: 0.000502

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000430

Gnomad OTH exome AF: 0.00102

GnomAD4 exome AF: 0.000615 AC: 327 AN: 531562 Hom.: 0 Cov.: 0 AF XY: 0.000673 AC XY: 192 AN XY: 285414

Gnomad4 AFR exome AF: 0.0000653

Gnomad4 AMR exome AF: 0.000623

Gnomad4 ASJ exome AF: 0.00730

Gnomad4 EAS exome AF: 0.000315

Gnomad4 SAS exome AF: 0.000436

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000260

Gnomad4 OTH exome AF: 0.00128

GnomAD4 genome AF: 0.000420 AC: 64 AN: 152292 Hom.: 0 Cov.: 32 AF XY: 0.000416 AC XY: 31 AN XY: 74456

Gnomad4 AFR AF: 0.0000241

Gnomad4 AMR AF: 0.000196

Gnomad4 ASJ AF: 0.00749

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000414

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000397

Gnomad4 OTH AF: 0.00189

Alfa AF: 0.000727 Hom.: 0

Bravo AF: 0.000457

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: no assertion criteria provided

Submissions by phenotype

CLASP1-related disorder Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Aug 19, 2020

This variant is classified as likely 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
BayesDel_noAF	Benign	-0.90
CADD	Benign	0.0010
DANN	Benign	0.47

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		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: rs376053483; hg19: chr2-122288449;