chr2-121530990-G-A

Variant names:

• chr2-121530990-G-A
• rs763500364
• NM_001395891.1:c.196-665C>T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PP5_Moderate BP4 BS2_Supporting

The NM_001395891.1(CLASP1):​c.196-665C>T variant causes a intron change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000157 in 700,064 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 Pathogenic (★).

• Frequency:
  • Genomes: 𝑓 0.000026 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000013 (0 hom.)
• Consequence: CLASP1 NM_001395891.1 intron
• Clinical Significance: Pathogenic criteria provided, single submitter P:3
• Conservation: PhyloP100: 7.60

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]

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]

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

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PP5: Variant 2-121530990-G-A is Pathogenic according to our data. Variant chr2-121530990-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 30181.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr2-121530990-G-A is described in Lovd as [Pathogenic]. Variant chr2-121530990-G-A is described in Lovd as [Pathogenic].
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.29). . Strength limited to SUPPORTING due to the PP5.
• BS2: High AC in GnomAdExome4 at 7 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 rank	MANE	Protein	UniProt
CLASP1	NM_001395891.1	c.196-665C>T		intron_variant	Intron 2 of 40	ENST00000696935.1	NP_001382820.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CLASP1	ENST00000696935.1	c.196-665C>T		intron_variant	Intron 2 of 40		NM_001395891.1	ENSP00000512981.1

Frequencies

GnomAD3 genomes AF: 0.0000263 AC: 4 AN: 152040 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000655

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: 0.0000441

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.0000383 AC: 5 AN: 130490 Hom.: 0 AF XY: 0.0000140 AC XY: 1 AN XY: 71230

Gnomad AFR exome AF: 0.000164

Gnomad AMR exome AF: 0.000123

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000201

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000128 AC: 7 AN: 548024 Hom.: 0 Cov.: 0 AF XY: 0.00000674 AC XY: 2 AN XY: 296754

Gnomad4 AFR exome AF: 0.000127

Gnomad4 AMR exome AF: 0.0000576

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000947

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.0000263 AC: 4 AN: 152040 Hom.: 0 Cov.: 32 AF XY: 0.0000269 AC XY: 2 AN XY: 74246

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.0000655

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000441

Gnomad4 OTH AF: 0.00

Bravo AF: 0.0000378

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, single submitter

Submissions by phenotype

Lowry-Wood syndrome Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Apr 08, 2011

- -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 06, 2025

This variant occurs in the RNU4ATAC gene, which encodes an RNA molecule that does not result in a protein product. This variant is present in population databases (rs763500364, gnomAD 0.02%). This variant has been observed in individual(s) with RNU4ATAC-related conditions (PMID: 21474760, 29265708; internal data). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 30181). Functional studies have shown that this variant disrupts ncRNA function (PMID: 21474760, 32628740) For these reasons, this variant has been classified as Pathogenic. -

Osteodysplastic primordial dwarfism, type 1 Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Apr 08, 2011

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.29
CADD	Benign	19
DANN	Benign	0.90
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1

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: rs763500364; hg19: chr2-122288566;