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Intellectual disability

Region: ISCA-37440-Loss

2p21 region (includes PREPL and SLC3A1) Loss

Green List (high evidence)

Chromosome: 2
GRCh38 Position: 44183133-44362502
Haploinsufficiency Score: Gene associated with autosomal recessive phenotype
Triplosensitivity Score:
Required percent of overlap: 60%
Variant types: CNV Loss

1 review

Eleanor Williams (Genomics England Curator)

The required percent of overlap for this region has been changed from 80% to 60% following NHS Genomic Medicine Service approval.
Created: 16 Mar 2022, 1:34 p.m. | Last Modified: 16 Mar 2022, 1:34 p.m.
Panel Version: 3.1520


ISCA Region Name
2p21 region (includes PREPL and SLC3A1) Loss
GRCh38 Coordinates
Haploinsufficiency Score
Gene associated with autosomal recessive phenotype
Triplosensitivity Score
Required percent of overlap
Mode of Inheritance
BIALLELIC, autosomal or pseudoautosomal
  • Expert Review Green
  • ClinGen
  • mild/moderate mental retardation
  • facial dysmorphism
  • Hypotonia-cystinuria syndrome (HCS)
  • 2p21 deletion syndrome
  • rapid weight gain in late childhood
  • failure to thrive
  • growth hormone deficiency
  • 606407
  • lactic acidemia
  • respiratory chain complex IV deficiency
  • hyperphagia
  • minor facial dysmorphism
  • severe somatic and developmental delay
  • nephrolithiasis
  • cystinuria
  • neonatal seizures
  • hypotonia
Clinvar variants
Variants in
Variant types
CNV Loss

History Filter Activity

16 Mar 2022, Gel status: 3

Changed Required Overlap Percentage

Arina Puzriakova (Genomics England Curator)

Required Overlap Percentage for ISCA-37440-Loss was changed from 80 to 60.

7 Sep 2018, Gel status: 4

Created, Added New Source, Set mode of inheritance, Set publications, Set Phenotypes

Louise Daugherty (Genomics England Curator)

Region: ISCA-37440-Loss was added Region: ISCA-37440-Loss was added to Intellectual disability. Sources: ClinGen,Expert Review Green Mode of inheritance for Region: ISCA-37440-Loss was set to BIALLELIC, autosomal or pseudoautosomal Publications for Region: ISCA-37440-Loss were set to 11524703; 18234729; 16385448 Phenotypes for Region: ISCA-37440-Loss were set to mild/moderate mental retardation; facial dysmorphism; Hypotonia-cystinuria syndrome (HCS); 2p21 deletion syndrome; rapid weight gain in late childhood; failure to thrive; growth hormone deficiency; 606407; lactic acidemia; respiratory chain complex IV deficiency; hyperphagia; minor facial dysmorphism; severe somatic and developmental delay; nephrolithiasis; cystinuria; neonatal seizures; hypotonia