2-121530887-C-G

Position:

chr2-121530887-C-G

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 1P and 2B. PP5BP4BS2_Supporting

The NM_001395891.1(CLASP1):c.196-562G>C variant causes a intron change. The variant allele was found at a frequency of 0.0000231 in 692,862 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 0.000013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000026 ( 0 hom. )

Consequence

CLASP1
NM_001395891.1 intron

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1U:1

Conservation

PhyloP100: 5.74

Variant links:

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 links:

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]

RNU4ATAC links:

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

CLASP1-AS1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -1 ACMG points.

PP5

Variant 2-121530887-C-G is Pathogenic according to our data. Variant chr2-121530887-C-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 1944546.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=1, Uncertain_significance=1}.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.23). . Strength limited to SUPPORTING due to the PP5.

BS2

High AC in GnomAdExome4 at 14 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	Effect	#exon/exons	MANE	Protein
CLASP1	NM_001395891.1 linkuse as main transcript	c.196-562G>C	intron_variant		ENST00000696935.1	NP_001382820.1
RNU4ATAC	NR_023343.1 linkuse as main transcript	n.8C>G	non_coding_transcript_exon_variant	1/1
CLASP1-AS1	XR_001739683.2 linkuse as main transcript	n.608+112C>G	intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	Effect	#exon/exons	TSL	MANE	Protein	Appris
CLASP1	ENST00000696935.1 linkuse as main transcript	c.196-562G>C	intron_variant			NM_001395891.1	ENSP00000512981	A2
RNU4ATAC	ENST00000580972.1 linkuse as main transcript	n.7C>G	non_coding_transcript_exon_variant	1/1
CLASP1-AS1	ENST00000577914.1 linkuse as main transcript	n.354+112C>G	intron_variant, non_coding_transcript_variant		3

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152176

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000154

AC:

AN:

129556

Hom.:

AF XY:

0.00

AC XY:

AN XY:

70760

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000415

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:

0.0000203

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000259

AC:

AN:

540686

Hom.:

Cov.:

AF XY:

0.0000240

AC XY:

AN XY:

291572

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000291

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000641

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000289

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152176

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74340

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.0000654

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1Uncertain:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Roifman syndrome

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

curation

Broad Center for Mendelian Genomics, Broad Institute of MIT and Harvard

May 02, 2023

The heterozygous n.7C>G variant in RNU4ATAC was identified by our study, in the compound heterozygous state with a pathogenic variant (ClinVar Variation ID: 1403727), in three siblings with microcephaly, retinal anomalies, motor delay, bronchiectasis, and multiple endocrine anomalies. Familial exome analysis revealed that this variant was in trans with a pathogenic variant (ClinVar Variation ID: 1403727). The n.7C>G variant in RNU4ATAC has not been previously reported in individuals with Roifman syndrome but has been identified in 0.0065% (1/15286) of Latino/Admixed American chromosomes by the Genome Aggregation Database (gnomAD, http://gnomad.broadinstitute.org; dbSNP ID: rs370715569). Although this variant has been seen in the general population in a heterozygous state, its frequency is low enough to be consistent with a recessive carrier frequency. This variant segregated with disease in the three affected individuals in the family identified by our study. Two different nucleotide changes at this site that have the same predicted impact have been reported pathogenic or likely pathogenic in the literature and/or in ClinVar, n.7G>A (PMID: 26522830, PMID: 32628740, Variation ID: 218086) and n.7G>T (Variation ID: 692040) have been reported pathogenic or likely pathogenic in the literature and in ClinVar. Multiple variants in the same region as n.7C>G have been reported in association with disease in the literature and the n.7C>G variant is located in a region of RNU4ATAC that is essential to its spliceosome activity, suggesting that this variant is in a key functional domain and slightly supports pathogenicity (PMID: 32628740). Computational prediction tools and conservation analyses suggest that this variant may impact the protein, though this information is not predictive enough to determine pathogenicity. In summary, although additional studies are required to fully establish its clinical significance, this variant is likely pathogenic for autosomal recessive Roifman syndrome. ACMG/AMP Criteria applied: PS1_Supporting, PM3, PM1_Supporting, PM2_Supporting, PP1, PP3 (Richards 2015). -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 19, 2022

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 (no rsID available, gnomAD 0.004%). This variant has not been reported in the literature in individuals affected with RNU4ATAC-related conditions. Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. This variant disrupts the n.8C nucleotide in the RNU4ATAC gene. Other variant(s) that disrupt this nucleotide have been determined to be pathogenic (PMID: 26522830, 32628740; Invitae). This suggests that this nucleotide is clinically significant, and that variants that disrupt this position are likely to be disease-causing. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.23

CADD

Benign

DANN

Benign

0.91

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over