5-37051759-ATTTTT-ATTTTTTT

Variant names:

• chr5-37051759-A-ATT
• rs757731487
• NM_133433.4:c.6955-10_6955-9dupTT

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 0P and 0B.

The NM_133433.4(NIPBL):​c.6955-10_6955-9dupTT variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000109 in 1,103,006 control chromosomes in the GnomAD database, with no homozygous occurrence. There is a variant allele frequency bias in the population database for this variant (GnomAdExome4), which may indicate mosaicism or somatic mutations in the reference population data. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000011 (0 hom.)
• Consequence: NIPBL NM_133433.4 splice_region, intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.231
• Publications: 0 publications found

Genes affected

NIPBL (HGNC:28862): (NIPBL cohesin loading factor) This gene encodes the homolog of the Drosophila melanogaster Nipped-B gene product and fungal Scc2-type sister chromatid cohesion proteins. The Drosophila protein facilitates enhancer-promoter communication of remote enhancers and plays a role in developmental regulation. It is also homologous to a family of chromosomal adherins with broad roles in sister chromatid cohesion, chromosome condensation, and DNA repair. The human protein has a bipartite nuclear targeting sequence and a putative HEAT repeat. Condensins, cohesins and other complexes with chromosome-related functions also contain HEAT repeats. Mutations in this gene result in Cornelia de Lange syndrome, a disorder characterized by dysmorphic facial features, growth delay, limb reduction defects, and cognitive disability. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

NIPBL Gene-Disease associations (from GenCC):

• Cornelia de Lange syndrome

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, ClinGen
• Cornelia de Lange syndrome 1

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_133433.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NIPBL	NM_133433.4	MANE Select	c.6955-10_6955-9dupTT		splice_region intron	N/A	NP_597677.2
	NIPBL	NM_001438586.1		c.6955-10_6955-9dupTT		splice_region intron	N/A	NP_001425515.1
	NIPBL	NM_015384.5		c.6955-10_6955-9dupTT		splice_region intron	N/A	NP_056199.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NIPBL	ENST00000282516.13	TSL:1 MANE Select	c.6955-10_6955-9dupTT		splice_region intron	N/A	ENSP00000282516.8	Q6KC79-1
	NIPBL	ENST00000448238.2	TSL:1	c.6955-10_6955-9dupTT		splice_region intron	N/A	ENSP00000406266.2	Q6KC79-2
	NIPBL	ENST00000652901.1		c.6955-10_6955-9dupTT		splice_region intron	N/A	ENSP00000499536.1	A0A590UJS4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.0000109 AC: 12 AN: 1103006 Hom.: 0 Cov.: 18 AF XY: 0.0000109 AC XY: 6 AN XY: 552394

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.0000397 AC: 1 AN: 25206

American (AMR) AF: 0.00 AC: 0 AN: 35440

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 19762

East Asian (EAS) AF: 0.00 AC: 0 AN: 30222

South Asian (SAS) AF: 0.00 AC: 0 AN: 67268

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 43950

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4742

European-Non Finnish (NFE) AF: 0.0000132 AC: 11 AN: 830874

Other (OTH) AF: 0.00 AC: 0 AN: 45542

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		-0.23
La Branchor		0.34
BranchPoint Hunter		4.0

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs757731487; hg19: chr5-37051861;